Merge pull request #2540 from RyanDwyer/typesafety

Implement type safe arguments and demote sway_container

include/sway/config.h

@@ -407,7 +407,9 @@ struct sway_config {
 		struct output_config *output_config;
 		struct seat_config *seat_config;
 		struct sway_seat *seat;
-		struct sway_container *current_container;
+		struct sway_node *node;
+		struct sway_container *container;
+		struct sway_workspace *workspace;
 		bool using_criteria;
 		struct {
 			int argc;
@@ -486,8 +488,7 @@ struct output_config *new_output_config(const char *name);
 
 void merge_output_config(struct output_config *dst, struct output_config *src);
 
-void apply_output_config(struct output_config *oc,
+void apply_output_config(struct output_config *oc, struct sway_output *output);
-		struct sway_container *output);
 
 struct output_config *store_output_config(struct output_config *oc);
 

include/sway/desktop/transaction.h

@@ -1,7 +1,6 @@
 #ifndef _SWAY_TRANSACTION_H
 #define _SWAY_TRANSACTION_H
-#include <wlr/render/wlr_texture.h>
+#include <stdint.h>
-#include "sway/tree/container.h"
 
 /**
  * Transactions enable us to perform atomic layout updates.
@@ -21,6 +20,7 @@
  */
 
 struct sway_transaction_instruction;
+struct sway_view;
 
 /**
  * Find all dirty containers, create and commit a transaction containing them,

include/sway/input/input-manager.h

@@ -37,10 +37,10 @@ struct sway_input_manager {
 struct sway_input_manager *input_manager_create(struct sway_server *server);
 
 bool input_manager_has_focus(struct sway_input_manager *input,
-		struct sway_container *container);
+		struct sway_node *node);
 
 void input_manager_set_focus(struct sway_input_manager *input,
-		struct sway_container *container);
+		struct sway_node *node);
 
 void input_manager_configure_xcursor(struct sway_input_manager *input);
 

include/sway/input/seat.h

@@ -13,9 +13,9 @@ struct sway_seat_device {
 	struct wl_list link; // sway_seat::devices
 };
 
-struct sway_seat_container {
+struct sway_seat_node {
 	struct sway_seat *seat;
-	struct sway_container *container;
+	struct sway_node *node;
 
 	struct wl_list link; // sway_seat::focus_stack
 
@@ -76,7 +76,7 @@ struct sway_seat {
 	uint32_t last_button_serial;
 
 	struct wl_listener focus_destroy;
-	struct wl_listener new_container;
+	struct wl_listener new_node;
 	struct wl_listener new_drag_icon;
 
 	struct wl_list devices; // sway_seat_device::link
@@ -100,10 +100,10 @@ void seat_remove_device(struct sway_seat *seat,
 
 void seat_configure_xcursor(struct sway_seat *seat);
 
-void seat_set_focus(struct sway_seat *seat, struct sway_container *container);
+void seat_set_focus(struct sway_seat *seat, struct sway_node *node);
 
 void seat_set_focus_warp(struct sway_seat *seat,
-		struct sway_container *container, bool warp, bool notify);
+		struct sway_node *node, bool warp, bool notify);
 
 void seat_set_focus_surface(struct sway_seat *seat,
 		struct wlr_surface *surface, bool unfocus);
@@ -114,7 +114,11 @@ void seat_set_focus_layer(struct sway_seat *seat,
 void seat_set_exclusive_client(struct sway_seat *seat,
 		struct wl_client *client);
 
-struct sway_container *seat_get_focus(struct sway_seat *seat);
+struct sway_node *seat_get_focus(struct sway_seat *seat);
+
+struct sway_workspace *seat_get_focused_workspace(struct sway_seat *seat);
+
+struct sway_container *seat_get_focused_container(struct sway_seat *seat);
 
 /**
  * Return the last container to be focused for the seat (or the most recently
@@ -125,32 +129,31 @@ struct sway_container *seat_get_focus(struct sway_seat *seat);
  * is destroyed, or focus moves to a container with children and we need to
  * descend into the next leaf in focus order.
  */
-struct sway_container *seat_get_focus_inactive(struct sway_seat *seat,
+struct sway_node *seat_get_focus_inactive(struct sway_seat *seat,
-		struct sway_container *container);
+		struct sway_node *node);
 
 struct sway_container *seat_get_focus_inactive_tiling(struct sway_seat *seat,
-		struct sway_container *container);
+		struct sway_workspace *workspace);
 
 /**
  * Descend into the focus stack to find the focus-inactive view. Useful for
  * container placement when they change position in the tree.
  */
 struct sway_container *seat_get_focus_inactive_view(struct sway_seat *seat,
-		struct sway_container *container);
+		struct sway_node *ancestor);
 
 /**
  * Return the immediate child of container which was most recently focused.
  */
-struct sway_container *seat_get_active_child(struct sway_seat *seat,
+struct sway_node *seat_get_active_child(struct sway_seat *seat,
-		struct sway_container *container);
+		struct sway_node *parent);
 
 /**
  * Iterate over the focus-inactive children of the container calling the
  * function on each.
  */
-void seat_focus_inactive_children_for_each(struct sway_seat *seat,
+void seat_for_each_node(struct sway_seat *seat,
-		struct sway_container *container,
+		void (*f)(struct sway_node *node, void *data), void *data);
-		void (*f)(struct sway_container *container, void *data), void *data);
 
 void seat_apply_config(struct sway_seat *seat, struct seat_config *seat_config);
 
@@ -173,7 +176,7 @@ void seat_begin_resize_tiling(struct sway_seat *seat,
 		struct sway_container *con, uint32_t button, enum wlr_edges edge);
 
 struct sway_container *seat_get_focus_inactive_floating(struct sway_seat *seat,
-		struct sway_container *container);
+		struct sway_workspace *workspace);
 
 void seat_end_mouse_operation(struct sway_seat *seat);
 

include/sway/ipc-json.h

@@ -7,8 +7,8 @@
 json_object *ipc_json_get_version();
 
 json_object *ipc_json_describe_disabled_output(struct sway_output *o);
-json_object *ipc_json_describe_container(struct sway_container *c);
+json_object *ipc_json_describe_node(struct sway_node *node);
-json_object *ipc_json_describe_container_recursive(struct sway_container *c);
+json_object *ipc_json_describe_node_recursive(struct sway_node *node);
 json_object *ipc_json_describe_input(struct sway_input_device *device);
 json_object *ipc_json_describe_seat(struct sway_seat *seat);
 json_object *ipc_json_describe_bar_config(struct bar_config *bar);

include/sway/ipc-server.h

@@ -11,8 +11,8 @@ void ipc_init(struct sway_server *server);
 
 struct sockaddr_un *ipc_user_sockaddr(void);
 
-void ipc_event_workspace(struct sway_container *old,
+void ipc_event_workspace(struct sway_workspace *old,
-		struct sway_container *new, const char *change);
+		struct sway_workspace *new, const char *change);
 void ipc_event_window(struct sway_container *window, const char *change);
 void ipc_event_barconfig_update(struct bar_config *bar);
 void ipc_event_mode(const char *mode, bool pango);

include/sway/output.h

@@ -6,14 +6,20 @@
 #include <wlr/types/wlr_box.h>
 #include <wlr/types/wlr_output.h>
 #include "config.h"
+#include "sway/tree/node.h"
 #include "sway/tree/view.h"
 
 struct sway_server;
 struct sway_container;
 
+struct sway_output_state {
+	list_t *workspaces;
+	struct sway_workspace *active_workspace;
+};
+
 struct sway_output {
+	struct sway_node node;
 	struct wlr_output *wlr_output;
-	struct sway_container *swayc;
 	struct sway_server *server;
 
 	struct wl_list layers[4]; // sway_layer_surface::link
@@ -22,11 +28,18 @@ struct sway_output {
 	struct timespec last_frame;
 	struct wlr_output_damage *damage;
 
+	int lx, ly;
+	int width, height;
+
+	bool enabled;
+	list_t *workspaces;
+
+	struct sway_output_state current;
+
 	struct wl_listener destroy;
 	struct wl_listener mode;
 	struct wl_listener transform;
 	struct wl_listener scale;
-
 	struct wl_listener damage_destroy;
 	struct wl_listener damage_frame;
 
@@ -39,13 +52,19 @@ struct sway_output {
 	} events;
 };
 
-struct sway_container *output_create(struct sway_output *sway_output);
+struct sway_output *output_create(struct wlr_output *wlr_output);
 
-void output_destroy(struct sway_container *output);
+void output_destroy(struct sway_output *output);
 
-void output_begin_destroy(struct sway_container *output);
+void output_begin_destroy(struct sway_output *output);
 
-struct sway_container *output_from_wlr_output(struct wlr_output *output);
+struct sway_output *output_from_wlr_output(struct wlr_output *output);
+
+struct sway_output *output_get_in_direction(struct sway_output *reference,
+		enum movement_direction direction);
+
+void output_add_workspace(struct sway_output *output,
+		struct sway_workspace *workspace);
 
 typedef void (*sway_surface_iterator_func_t)(struct sway_output *output,
 	struct wlr_surface *surface, struct wlr_box *box, float rotation,
@@ -64,15 +83,19 @@ void output_damage_box(struct sway_output *output, struct wlr_box *box);
 void output_damage_whole_container(struct sway_output *output,
 	struct sway_container *con);
 
-struct sway_container *output_by_name(const char *name);
+struct sway_output *output_by_name(const char *name);
 
-void output_sort_workspaces(struct sway_container *output);
+void output_sort_workspaces(struct sway_output *output);
 
-void output_enable(struct sway_output *output);
+struct output_config *output_find_config(struct sway_output *output);
+
+void output_enable(struct sway_output *output, struct output_config *oc);
+
+void output_disable(struct sway_output *output);
 
 bool output_has_opaque_overlay_layer_surface(struct sway_output *output);
 
-struct sway_container *output_get_active_workspace(struct sway_output *output);
+struct sway_workspace *output_get_active_workspace(struct sway_output *output);
 
 void output_render(struct sway_output *output, struct timespec *when,
 	pixman_region32_t *damage);
@@ -103,16 +126,23 @@ void output_drag_icons_for_each_surface(struct sway_output *output,
 	struct wl_list *drag_icons, sway_surface_iterator_func_t iterator,
 	void *user_data);
 
-void output_for_each_workspace(struct sway_container *output,
+void output_for_each_workspace(struct sway_output *output,
+		void (*f)(struct sway_workspace *ws, void *data), void *data);
+
+void output_for_each_container(struct sway_output *output,
 		void (*f)(struct sway_container *con, void *data), void *data);
 
-void output_for_each_container(struct sway_container *output,
+struct sway_workspace *output_find_workspace(struct sway_output *output,
-		void (*f)(struct sway_container *con, void *data), void *data);
+		bool (*test)(struct sway_workspace *ws, void *data), void *data);
 
-struct sway_container *output_find_workspace(struct sway_container *output,
+struct sway_container *output_find_container(struct sway_output *output,
 		bool (*test)(struct sway_container *con, void *data), void *data);
 
-struct sway_container *output_find_container(struct sway_container *output,
+void output_get_box(struct sway_output *output, struct wlr_box *box);
-		bool (*test)(struct sway_container *con, void *data), void *data);
+
+enum sway_container_layout output_get_default_layout(
+		struct sway_output *output);
+
+void output_add_listeners(struct sway_output *output);
 
 #endif

include/sway/server.h

@@ -56,7 +56,7 @@ struct sway_server {
 
 	size_t txn_timeout_ms;
 	list_t *transactions;
-	list_t *dirty_containers;
+	list_t *dirty_nodes;
 };
 
 struct sway_server server;

include/sway/tree/arrange.h

@@ -1,16 +1,19 @@
 #ifndef _SWAY_ARRANGE_H
 #define _SWAY_ARRANGE_H
 
+struct sway_output;
+struct sway_workspace;
 struct sway_container;
+struct sway_node;
 
 void arrange_container(struct sway_container *container);
 
-void arrange_workspace(struct sway_container *workspace);
+void arrange_workspace(struct sway_workspace *workspace);
 
-void arrange_output(struct sway_container *output);
+void arrange_output(struct sway_output *output);
 
 void arrange_root(void);
 
-void arrange_windows(struct sway_container *container);
+void arrange_node(struct sway_node *node);
 
 #endif

include/sway/tree/container.h

@@ -5,8 +5,7 @@
 #include <wlr/types/wlr_box.h>
 #include <wlr/types/wlr_surface.h>
 #include "list.h"
-
+#include "sway/tree/node.h"
-extern struct sway_container root_container;
 
 struct sway_view;
 struct sway_seat;
@@ -17,23 +16,6 @@ struct sway_seat;
 #define TITLEBAR_H_PADDING 3
 #define TITLEBAR_V_PADDING 4
 
-/**
- * Different kinds of containers.
- *
- * This enum is in order. A container will never be inside of a container below
- * it on this list.
- */
-enum sway_container_type {
-	C_ROOT,
-	C_OUTPUT,
-	C_WORKSPACE,
-	C_CONTAINER,
-	C_VIEW,
-
-	// Keep last
-	C_TYPES,
-};
-
 enum sway_container_layout {
 	L_NONE,
 	L_HORIZ,
@@ -57,18 +39,14 @@ enum movement_direction;
 enum wlr_direction;
 
 struct sway_container_state {
-	// Container/swayc properties
+	// Container properties
 	enum sway_container_layout layout;
-	double swayc_x, swayc_y;
+	double con_x, con_y;
-	double swayc_width, swayc_height;
+	double con_width, con_height;
 
 	bool is_fullscreen;
 
-	bool has_gaps;
+	struct sway_workspace *workspace;
-	double current_gaps;
-	double gaps_inner;
-	double gaps_outer;
-
 	struct sway_container *parent;
 	list_t *children;
 
@@ -86,35 +64,19 @@ struct sway_container_state {
 	bool border_left;
 	bool border_right;
 	bool using_csd;
-
-	// Workspace properties
-	struct sway_container *ws_fullscreen;
-	list_t *ws_floating;
 };
 
 struct sway_container {
-	union {
+	struct sway_node node;
-		// TODO: Encapsulate state for other node types as well like C_CONTAINER
+	struct sway_view *view;
-		struct sway_root *sway_root;
-		struct sway_output *sway_output;
-		struct sway_workspace *sway_workspace;
-		struct sway_view *sway_view;
-	};
-
-	/**
-	 * A unique ID to identify this container. Primarily used in the
-	 * get_tree JSON output.
-	 */
-	size_t id;
 
 	// The pending state is the main container properties, and the current state is in the below struct.
 	// This means most places of the code can refer to the main variables (pending state) and it'll just work.
 	struct sway_container_state current;
 
-	char *name;            // The view's title (unformatted)
+	char *title;           // The view's title (unformatted)
 	char *formatted_title; // The title displayed in the title bar
 
-	enum sway_container_type type;
 	enum sway_container_layout layout;
 	enum sway_container_layout prev_split_layout;
 
@@ -132,14 +94,13 @@ struct sway_container {
 
 	// The gaps currently applied to the container.
 	double current_gaps;
-
 	bool has_gaps;
 	double gaps_inner;
 	double gaps_outer;
 
-	list_t *children;
+	struct sway_workspace *workspace; // NULL when hidden in the scratchpad
-
+	struct sway_container *parent;    // NULL if container in root of workspace
-	struct sway_container *parent;
+	list_t *children;                 // struct sway_container
 
 	// Outputs currently being intersected
 	list_t *outputs; // struct sway_output
@@ -157,42 +118,17 @@ struct sway_container {
 	struct wlr_texture *title_urgent;
 	size_t title_height;
 
-	// The number of transactions which reference this container.
-	size_t ntxnrefs;
-
-	// If this container is a view and is waiting for the client to respond to a
-	// configure then this will be populated, otherwise NULL.
-	struct sway_transaction_instruction *instruction;
-
-	bool destroying;
-
-	// If true, indicates that the container has pending state that differs from
-	// the current.
-	bool dirty;
-
 	struct {
 		struct wl_signal destroy;
 	} events;
 };
 
-struct sway_container *container_create(enum sway_container_type type);
+struct sway_container *container_create(struct sway_view *view);
-
-const char *container_type_to_str(enum sway_container_type type);
-
-/*
- * Create a new view container. A view can be a child of a workspace container
- * or a container container and are rendered in the order and structure of
- * how they are attached to the tree.
- */
-struct sway_container *container_view_create(
-		struct sway_container *sibling, struct sway_view *sway_view);
 
 void container_destroy(struct sway_container *con);
 
 void container_begin_destroy(struct sway_container *con);
 
-struct sway_container *container_close(struct sway_container *container);
-
 /**
  * Search a container's descendants a container based on test criteria. Returns
  * the first container that passes the test.
@@ -200,23 +136,17 @@ struct sway_container *container_close(struct sway_container *container);
 struct sway_container *container_find_child(struct sway_container *container,
 		bool (*test)(struct sway_container *view, void *data), void *data);
 
-/**
- * Finds a parent container with the given struct sway_containerype.
- */
-struct sway_container *container_parent(struct sway_container *container,
-		enum sway_container_type type);
-
 /**
  * Find a container at the given coordinates. Returns the the surface and
  * surface-local coordinates of the given layout coordinates if the container
  * is a view and the view contains a surface at those coordinates.
  */
-struct sway_container *container_at(struct sway_container *workspace,
+struct sway_container *container_at(struct sway_workspace *workspace,
 		double lx, double ly, struct wlr_surface **surface,
 		double *sx, double *sy);
 
 struct sway_container *tiling_container_at(
-		struct sway_container *con, double lx, double ly,
+		struct sway_node *parent, double lx, double ly,
 		struct wlr_surface **surface, double *sx, double *sy);
 
 void container_for_each_child(struct sway_container *container,
@@ -228,16 +158,11 @@ void container_for_each_child(struct sway_container *container,
 bool container_has_ancestor(struct sway_container *container,
 		struct sway_container *ancestor);
 
-int container_count_descendants_of_type(struct sway_container *con,
-		enum sway_container_type type);
-
-void container_create_notify(struct sway_container *container);
-
 void container_update_textures_recursive(struct sway_container *con);
 
 void container_damage_whole(struct sway_container *container);
 
-struct sway_container *container_reap_empty(struct sway_container *con);
+void container_reap_empty(struct sway_container *con);
 
 struct sway_container *container_flatten(struct sway_container *container);
 
@@ -248,11 +173,10 @@ void container_update_title_textures(struct sway_container *container);
  */
 void container_calculate_title_height(struct sway_container *container);
 
-/**
+size_t container_build_representation(enum sway_container_layout layout,
- * Notify a container that a tree modification has changed in its children,
+		list_t *children, char *buffer);
- * so the container can update its tree representation.
+
- */
+void container_update_representation(struct sway_container *container);
-void container_notify_subtree_changed(struct sway_container *container);
 
 /**
  * Return the height of a regular title bar.
@@ -288,8 +212,7 @@ void container_floating_translate(struct sway_container *con,
 /**
  * Choose an output for the floating container's new position.
  */
-struct sway_container *container_floating_find_output(
+struct sway_output *container_floating_find_output(struct sway_container *con);
-		struct sway_container *con);
 
 /**
  * Move a floating container to a new layout-local position.
@@ -302,12 +225,6 @@ void container_floating_move_to(struct sway_container *con,
  */
 void container_floating_move_to_center(struct sway_container *con);
 
-/**
- * Mark a container as dirty if it isn't already. Dirty containers will be
- * included in the next transaction then unmarked as dirty.
- */
-void container_set_dirty(struct sway_container *container);
-
 bool container_has_urgent_child(struct sway_container *container);
 
 /**
@@ -342,10 +259,18 @@ void container_remove_gaps(struct sway_container *container);
 
 void container_add_gaps(struct sway_container *container);
 
+enum sway_container_layout container_parent_layout(struct sway_container *con);
+
+enum sway_container_layout container_current_parent_layout(
+		struct sway_container *con);
+
+list_t *container_get_siblings(const struct sway_container *container);
+
 int container_sibling_index(const struct sway_container *child);
 
-void container_handle_fullscreen_reparent(struct sway_container *con,
+list_t *container_get_current_siblings(struct sway_container *container);
-		struct sway_container *old_parent);
+
+void container_handle_fullscreen_reparent(struct sway_container *con);
 
 void container_add_child(struct sway_container *parent,
 		struct sway_container *child);
@@ -353,19 +278,16 @@ void container_add_child(struct sway_container *parent,
 void container_insert_child(struct sway_container *parent,
 		struct sway_container *child, int i);
 
-struct sway_container *container_add_sibling(struct sway_container *parent,
+void container_add_sibling(struct sway_container *parent,
 		struct sway_container *child);
 
-struct sway_container *container_remove_child(struct sway_container *child);
+void container_detach(struct sway_container *child);
 
-struct sway_container *container_replace_child(struct sway_container *child,
+void container_replace(struct sway_container *container,
-		struct sway_container *new_child);
+		struct sway_container *replacement);
 
 bool sway_dir_to_wlr(enum movement_direction dir, enum wlr_direction *out);
 
-enum sway_container_layout container_get_default_layout(
-		struct sway_container *con);
-
 struct sway_container *container_split(struct sway_container *child,
 		enum sway_container_layout layout);
 

include/sway/tree/node.h

@@ -0,0 +1,74 @@
+#ifndef _SWAY_NODE_H
+#define _SWAY_NODE_H
+#include <stdbool.h>
+#include "list.h"
+
+struct sway_root;
+struct sway_output;
+struct sway_workspace;
+struct sway_container;
+struct sway_transaction_instruction;
+struct wlr_box;
+
+enum sway_node_type {
+	N_ROOT,
+	N_OUTPUT,
+	N_WORKSPACE,
+	N_CONTAINER,
+};
+
+struct sway_node {
+	enum sway_node_type type;
+	union {
+		struct sway_root *sway_root;
+		struct sway_output *sway_output;
+		struct sway_workspace *sway_workspace;
+		struct sway_container *sway_container;
+	};
+
+	/**
+	 * A unique ID to identify this node.
+	 * Primarily used in the get_tree JSON output.
+	 */
+	size_t id;
+
+	struct sway_transaction_instruction *instruction;
+	size_t ntxnrefs;
+	bool destroying;
+
+	// If true, indicates that the container has pending state that differs from
+	// the current.
+	bool dirty;
+
+	struct {
+		struct wl_signal destroy;
+	} events;
+};
+
+void node_init(struct sway_node *node, enum sway_node_type type, void *thing);
+
+const char *node_type_to_str(enum sway_node_type type);
+
+/**
+ * Mark a node as dirty if it isn't already. Dirty nodes will be included in the
+ * next transaction then unmarked as dirty.
+ */
+void node_set_dirty(struct sway_node *node);
+
+bool node_is_view(struct sway_node *node);
+
+char *node_get_name(struct sway_node *node);
+
+void node_get_box(struct sway_node *node, struct wlr_box *box);
+
+struct sway_output *node_get_output(struct sway_node *node);
+
+enum sway_container_layout node_get_layout(struct sway_node *node);
+
+struct sway_node *node_get_parent(struct sway_node *node);
+
+list_t *node_get_children(struct sway_node *node);
+
+bool node_has_ancestor(struct sway_node *node, struct sway_node *ancestor);
+
+#endif

include/sway/tree/root.h

@@ -5,12 +5,14 @@
 #include <wlr/types/wlr_output_layout.h>
 #include <wlr/render/wlr_texture.h>
 #include "sway/tree/container.h"
+#include "sway/tree/node.h"
 #include "config.h"
 #include "list.h"
 
-extern struct sway_container root_container;
+extern struct sway_root *root;
 
 struct sway_root {
+	struct sway_node node;
 	struct wlr_output_layout *output_layout;
 
 	struct wl_listener output_layout_change;
@@ -24,17 +26,21 @@ struct sway_root {
 	// Includes disabled outputs
 	struct wl_list all_outputs; // sway_output::link
 
+	double x, y;
+	double width, height;
+
+	list_t *outputs; // struct sway_output
 	list_t *scratchpad; // struct sway_container
 	list_t *saved_workspaces; // For when there's no connected outputs
 
 	struct {
-		struct wl_signal new_container;
+		struct wl_signal new_node;
 	} events;
 };
 
-void root_create(void);
+struct sway_root *root_create(void);
 
-void root_destroy(void);
+void root_destroy(struct sway_root *root);
 
 /**
  * Move a container to the scratchpad.
@@ -56,23 +62,25 @@ void root_scratchpad_show(struct sway_container *con);
  */
 void root_scratchpad_hide(struct sway_container *con);
 
-struct sway_container *root_workspace_for_pid(pid_t pid);
+struct sway_workspace *root_workspace_for_pid(pid_t pid);
 
 void root_record_workspace_pid(pid_t pid);
 
-void root_for_each_workspace(void (*f)(struct sway_container *con, void *data),
+void root_for_each_workspace(void (*f)(struct sway_workspace *ws, void *data),
 		void *data);
 
 void root_for_each_container(void (*f)(struct sway_container *con, void *data),
 		void *data);
 
-struct sway_container *root_find_output(
+struct sway_output *root_find_output(
-		bool (*test)(struct sway_container *con, void *data), void *data);
+		bool (*test)(struct sway_output *output, void *data), void *data);
 
-struct sway_container *root_find_workspace(
+struct sway_workspace *root_find_workspace(
-		bool (*test)(struct sway_container *con, void *data), void *data);
+		bool (*test)(struct sway_workspace *ws, void *data), void *data);
 
 struct sway_container *root_find_container(
 		bool (*test)(struct sway_container *con, void *data), void *data);
 
+void root_get_box(struct sway_root *root, struct wlr_box *box);
+
 #endif

include/sway/tree/view.h

@@ -58,7 +58,7 @@ struct sway_view {
 	enum sway_view_type type;
 	const struct sway_view_impl *impl;
 
-	struct sway_container *swayc; // NULL for unmapped views
+	struct sway_container *container; // NULL if unmapped and transactions finished
 	struct wlr_surface *surface; // NULL for unmapped views
 
 	// Geometry of the view itself (excludes borders) in layout coordinates
@@ -254,7 +254,7 @@ uint32_t view_configure(struct sway_view *view, double lx, double ly, int width,
 	int height);
 
 /**
- * Configure the view's position and size based on the swayc's position and
+ * Configure the view's position and size based on the container's position and
  * size, taking borders into consideration.
  */
 void view_autoconfigure(struct sway_view *view);

include/sway/tree/workspace.h

@@ -3,66 +3,98 @@
 
 #include <stdbool.h>
 #include "sway/tree/container.h"
+#include "sway/tree/node.h"
 
 struct sway_view;
 
-struct sway_workspace {
+struct sway_workspace_state {
-	struct sway_container *swayc;
 	struct sway_container *fullscreen;
-	list_t *floating; // struct sway_container
+	double x, y;
+	int width, height;
+	enum sway_container_layout layout;
+	struct sway_output *output;
+	list_t *floating;
+	list_t *tiling;
+
+	struct sway_container *focused_inactive_child;
+	bool focused;
+};
+
+struct sway_workspace {
+	struct sway_node node;
+	struct sway_container *fullscreen;
+
+	char *name;
+	char *representation;
+
+	double x, y;
+	int width, height;
+	enum sway_container_layout layout;
+	enum sway_container_layout prev_split_layout;
+
+	double current_gaps;
+	bool has_gaps;
+	double gaps_inner;
+	double gaps_outer;
+
+	struct sway_output *output; // NULL if no outputs are connected
+	list_t *floating;           // struct sway_container
+	list_t *tiling;             // struct sway_container
 	list_t *output_priority;
 	bool urgent;
+
+	struct sway_workspace_state current;
 };
 
 extern char *prev_workspace_name;
 
-struct sway_container *workspace_get_initial_output(const char *name);
+struct sway_output *workspace_get_initial_output(const char *name);
 
-struct sway_container *workspace_create(struct sway_container *output,
+struct sway_workspace *workspace_create(struct sway_output *output,
 		const char *name);
 
-void workspace_destroy(struct sway_container *workspace);
+void workspace_destroy(struct sway_workspace *workspace);
 
-void workspace_begin_destroy(struct sway_container *workspace);
+void workspace_begin_destroy(struct sway_workspace *workspace);
 
-void workspace_consider_destroy(struct sway_container *ws);
+void workspace_consider_destroy(struct sway_workspace *ws);
 
 char *workspace_next_name(const char *output_name);
 
-bool workspace_switch(struct sway_container *workspace,
+bool workspace_switch(struct sway_workspace *workspace,
 		bool no_auto_back_and_forth);
 
-struct sway_container *workspace_by_number(const char* name);
+struct sway_workspace *workspace_by_number(const char* name);
 
-struct sway_container *workspace_by_name(const char*);
+struct sway_workspace *workspace_by_name(const char*);
 
-struct sway_container *workspace_output_next(struct sway_container *current);
+struct sway_workspace *workspace_output_next(struct sway_workspace *current);
 
-struct sway_container *workspace_next(struct sway_container *current);
+struct sway_workspace *workspace_next(struct sway_workspace *current);
 
-struct sway_container *workspace_output_prev(struct sway_container *current);
+struct sway_workspace *workspace_output_prev(struct sway_workspace *current);
 
-struct sway_container *workspace_prev(struct sway_container *current);
+struct sway_workspace *workspace_prev(struct sway_workspace *current);
 
-bool workspace_is_visible(struct sway_container *ws);
+bool workspace_is_visible(struct sway_workspace *ws);
 
-bool workspace_is_empty(struct sway_container *ws);
+bool workspace_is_empty(struct sway_workspace *ws);
 
-void workspace_output_raise_priority(struct sway_container *workspace,
+void workspace_output_raise_priority(struct sway_workspace *workspace,
-		struct sway_container *old_output, struct sway_container *new_output);
+		struct sway_output *old_output, struct sway_output *new_output);
 
-void workspace_output_add_priority(struct sway_container *workspace,
+void workspace_output_add_priority(struct sway_workspace *workspace,
-		struct sway_container *output);
+		struct sway_output *output);
 
-struct sway_container *workspace_output_get_highest_available(
+struct sway_output *workspace_output_get_highest_available(
-		struct sway_container *ws, struct sway_container *exclude);
+		struct sway_workspace *ws, struct sway_output *exclude);
 
-void workspace_detect_urgent(struct sway_container *workspace);
+void workspace_detect_urgent(struct sway_workspace *workspace);
 
-void workspace_for_each_container(struct sway_container *ws,
+void workspace_for_each_container(struct sway_workspace *ws,
 		void (*f)(struct sway_container *con, void *data), void *data);
 
-struct sway_container *workspace_find_container(struct sway_container *ws,
+struct sway_container *workspace_find_container(struct sway_workspace *ws,
 		bool (*test)(struct sway_container *con, void *data), void *data);
 
 /**
@@ -70,13 +102,28 @@ struct sway_container *workspace_find_container(struct sway_container *ws,
  * The new container will be the only direct tiling child of the workspace.
  * The new container is returned.
  */
-struct sway_container *workspace_wrap_children(struct sway_container *ws);
+struct sway_container *workspace_wrap_children(struct sway_workspace *ws);
 
-void workspace_add_floating(struct sway_container *workspace,
+void workspace_detach(struct sway_workspace *workspace);
+
+void workspace_add_tiling(struct sway_workspace *workspace,
 		struct sway_container *con);
 
-void workspace_remove_gaps(struct sway_container *ws);
+void workspace_add_floating(struct sway_workspace *workspace,
+		struct sway_container *con);
 
-void workspace_add_gaps(struct sway_container *ws);
+void workspace_insert_tiling(struct sway_workspace *workspace,
+		struct sway_container *con, int index);
+
+void workspace_remove_gaps(struct sway_workspace *ws);
+
+void workspace_add_gaps(struct sway_workspace *ws);
+
+struct sway_container *workspace_split(struct sway_workspace *workspace,
+		enum sway_container_layout layout);
+
+void workspace_update_representation(struct sway_workspace *ws);
+
+void workspace_get_box(struct sway_workspace *workspace, struct wlr_box *box);
 
 #endif

sway/commands.c

@@ -212,6 +212,24 @@ struct cmd_handler *find_handler(char *line, struct cmd_handler *cmd_handlers,
 	return res;
 }
 
+static void set_config_node(struct sway_node *node) {
+	config->handler_context.node = node;
+	switch (node->type) {
+	case N_CONTAINER:
+		config->handler_context.container = node->sway_container;
+		config->handler_context.workspace = node->sway_container->workspace;
+		break;
+	case N_WORKSPACE:
+		config->handler_context.container = NULL;
+		config->handler_context.workspace = node->sway_workspace;
+		break;
+	default:
+		config->handler_context.container = NULL;
+		config->handler_context.workspace = NULL;
+		break;
+	}
+}
+
 struct cmd_results *execute_command(char *_exec, struct sway_seat *seat) {
 	// Even though this function will process multiple commands we will only
 	// return the last error, if any (for now). (Since we have access to an
@@ -295,12 +313,7 @@ struct cmd_results *execute_command(char *_exec, struct sway_seat *seat) {
 			if (!config->handler_context.using_criteria) {
 				// without criteria, the command acts upon the focused
 				// container
-				config->handler_context.current_container =
+				set_config_node(seat_get_focus_inactive(seat, &root->node));
-					seat_get_focus_inactive(seat, &root_container);
-				if (!sway_assert(config->handler_context.current_container,
-						"could not get focus-inactive for root container")) {
-					return NULL;
-				}
 				struct cmd_results *res = handler->handle(argc-1, argv+1);
 				if (res->status != CMD_SUCCESS) {
 					free_argv(argc, argv);
@@ -314,7 +327,7 @@ struct cmd_results *execute_command(char *_exec, struct sway_seat *seat) {
 			} else {
 				for (int i = 0; i < views->length; ++i) {
 					struct sway_view *view = views->items[i];
-					config->handler_context.current_container = view->swayc;
+					set_config_node(&view->container->node);
 					struct cmd_results *res = handler->handle(argc-1, argv+1);
 					if (res->status != CMD_SUCCESS) {
 						free_argv(argc, argv);

sway/commands/border.c

@@ -13,13 +13,12 @@ struct cmd_results *cmd_border(int argc, char **argv) {
 		return error;
 	}
 
-	struct sway_container *container =
+	struct sway_container *container = config->handler_context.container;
-		config->handler_context.current_container;
+	if (!container->view) {
-	if (container->type != C_VIEW) {
 		return cmd_results_new(CMD_INVALID, "border",
 				"Only views can have borders");
 	}
-	struct sway_view *view = container->sway_view;
+	struct sway_view *view = container->view;
 
 	if (strcmp(argv[0], "none") == 0) {
 		view->border = B_NONE;
@@ -38,11 +37,11 @@ struct cmd_results *cmd_border(int argc, char **argv) {
 		view->border_thickness = atoi(argv[1]);
 	}
 
-	if (container_is_floating(view->swayc)) {
+	if (container_is_floating(view->container)) {
-		container_set_geometry_from_floating_view(view->swayc);
+		container_set_geometry_from_floating_view(view->container);
 	}
 
-	arrange_windows(view->swayc);
+	arrange_container(view->container);
 
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
 	if (seat->cursor) {

sway/commands/floating.c

@@ -15,24 +15,23 @@ struct cmd_results *cmd_floating(int argc, char **argv) {
 	if ((error = checkarg(argc, "floating", EXPECTED_EQUAL_TO, 1))) {
 		return error;
 	}
-	struct sway_container *container =
+	struct sway_container *container = config->handler_context.container;
-		config->handler_context.current_container;
+	struct sway_workspace *workspace = config->handler_context.workspace;
-	if (container->type == C_WORKSPACE && container->children->length == 0) {
+	if (!container && workspace->tiling->length == 0) {
 		return cmd_results_new(CMD_INVALID, "floating",
 				"Can't float an empty workspace");
 	}
-	if (container->type == C_WORKSPACE) {
+	if (!container) {
 		// Wrap the workspace's children in a container so we can float it
-		struct sway_container *workspace = container;
+		container = workspace_wrap_children(workspace);
-		container = workspace_wrap_children(container);
 		workspace->layout = L_HORIZ;
-		seat_set_focus(config->handler_context.seat, container);
+		seat_set_focus(config->handler_context.seat, &container->node);
 	}
 
 	// If the container is in a floating split container,
 	// operate on the split container instead of the child.
 	if (container_is_floating_or_child(container)) {
-		while (container->parent->type != C_WORKSPACE) {
+		while (container->parent) {
 			container = container->parent;
 		}
 	}
@@ -51,8 +50,7 @@ struct cmd_results *cmd_floating(int argc, char **argv) {
 
 	container_set_floating(container, wants_floating);
 
-	struct sway_container *workspace = container_parent(container, C_WORKSPACE);
+	arrange_workspace(container->workspace);
-	arrange_windows(workspace);
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }

sway/commands/focus.c

@@ -34,58 +34,49 @@ static bool parse_movement_direction(const char *name,
 }
 
 /**
- * Get swayc in the direction of newly entered output.
+ * Get node in the direction of newly entered output.
  */
-static struct sway_container *get_swayc_in_output_direction(
+static struct sway_node *get_node_in_output_direction(
-		struct sway_container *output, enum movement_direction dir,
+		struct sway_output *output, enum movement_direction dir) {
-		struct sway_seat *seat) {
+	struct sway_seat *seat = config->handler_context.seat;
-	if (!output) {
+	struct sway_workspace *ws = output_get_active_workspace(output);
-		return NULL;
+	if (ws->fullscreen) {
+		return seat_get_focus_inactive(seat, &ws->fullscreen->node);
 	}
+	struct sway_container *container = NULL;
 
-	struct sway_container *ws = seat_get_focus_inactive(seat, output);
+	if (ws->tiling->length > 0) {
-	if (ws->type != C_WORKSPACE) {
-		ws = container_parent(ws, C_WORKSPACE);
-	}
-
-	if (ws == NULL) {
-		wlr_log(WLR_ERROR, "got an output without a workspace");
-		return NULL;
-	}
-
-	if (ws->children->length > 0) {
 		switch (dir) {
 		case MOVE_LEFT:
 			if (ws->layout == L_HORIZ || ws->layout == L_TABBED) {
 				// get most right child of new output
-				return ws->children->items[ws->children->length-1];
+				container = ws->tiling->items[ws->tiling->length-1];
 			} else {
-				return seat_get_focus_inactive(seat, ws);
+				container = seat_get_focus_inactive_tiling(seat, ws);
 			}
+			break;
 		case MOVE_RIGHT:
 			if (ws->layout == L_HORIZ || ws->layout == L_TABBED) {
 				// get most left child of new output
-				return ws->children->items[0];
+				container = ws->tiling->items[0];
 			} else {
-				return seat_get_focus_inactive(seat, ws);
+				container = seat_get_focus_inactive_tiling(seat, ws);
 			}
+			break;
 		case MOVE_UP:
+			if (ws->layout == L_VERT || ws->layout == L_STACKED) {
+				// get most bottom child of new output
+				container = ws->tiling->items[ws->tiling->length-1];
+			} else {
+				container = seat_get_focus_inactive_tiling(seat, ws);
+			}
+			break;
 		case MOVE_DOWN: {
-			struct sway_container *focused =
+			if (ws->layout == L_VERT || ws->layout == L_STACKED) {
-				seat_get_focus_inactive(seat, ws);
+				// get most top child of new output
-			if (focused && focused->parent) {
+				container = ws->tiling->items[0];
-				struct sway_container *parent = focused->parent;
+			} else {
-				if (parent->layout == L_VERT) {
+				container = seat_get_focus_inactive_tiling(seat, ws);
-					if (dir == MOVE_UP) {
-						// get child furthest down on new output
-						int idx = parent->children->length - 1;
-						return parent->children->items[idx];
-					} else if (dir == MOVE_DOWN) {
-						// get child furthest up on new output
-						return parent->children->items[0];
-					}
-				}
-				return focused;
 			}
 			break;
 		}
@@ -94,151 +85,90 @@ static struct sway_container *get_swayc_in_output_direction(
 		}
 	}
 
-	return ws;
+	if (container) {
+		container = seat_get_focus_inactive_view(seat, &container->node);
+		return &container->node;
+	}
+
+	return &ws->node;
 }
 
-static struct sway_container *container_get_in_direction(
+static struct sway_node *node_get_in_direction(struct sway_container *container,
-		struct sway_container *container, struct sway_seat *seat,
+		struct sway_seat *seat, enum movement_direction dir) {
-		enum movement_direction dir) {
-	struct sway_container *parent = container->parent;
-
-	if (dir == MOVE_CHILD) {
-		return seat_get_focus_inactive(seat, container);
-	}
 	if (container->is_fullscreen) {
 		if (dir == MOVE_PARENT) {
 			return NULL;
 		}
-		container = container_parent(container, C_OUTPUT);
+		// Fullscreen container with a direction - go straight to outputs
-		parent = container->parent;
+		struct sway_output *output = container->workspace->output;
-	} else {
+		struct sway_output *new_output = output_get_in_direction(output, dir);
-		if (dir == MOVE_PARENT) {
+		return get_node_in_output_direction(new_output, dir);
-			if (parent->type == C_OUTPUT || container_is_floating(container)) {
+	}
-				return NULL;
+	if (dir == MOVE_PARENT) {
-			} else {
+		return node_get_parent(&container->node);
-				return parent;
-			}
-		}
 	}
 
 	struct sway_container *wrap_candidate = NULL;
-	while (true) {
+	struct sway_container *current = container;
+	while (current) {
 		bool can_move = false;
 		int desired;
-		int idx = list_find(container->parent->children, container);
+		int idx = container_sibling_index(current);
-		if (idx == -1) {
+		enum sway_container_layout parent_layout =
-			return NULL;
+			container_parent_layout(current);
-		}
+		list_t *siblings = container_get_siblings(current);
-		if (parent->type == C_ROOT) {
-			enum wlr_direction wlr_dir = 0;
-			if (!sway_assert(sway_dir_to_wlr(dir, &wlr_dir),
-						"got invalid direction: %d", dir)) {
-				return NULL;
-			}
-			int lx = container->x + container->width / 2;
-			int ly = container->y + container->height / 2;
-			struct wlr_output_layout *layout =
-				root_container.sway_root->output_layout;
-			struct wlr_output *wlr_adjacent =
-				wlr_output_layout_adjacent_output(layout, wlr_dir,
-					container->sway_output->wlr_output, lx, ly);
-			struct sway_container *adjacent =
-				output_from_wlr_output(wlr_adjacent);
 
-			if (!adjacent || adjacent == container) {
+		if (dir == MOVE_LEFT || dir == MOVE_RIGHT) {
-				if (!wrap_candidate) {
+			if (parent_layout == L_HORIZ || parent_layout == L_TABBED) {
-					return NULL;
+				can_move = true;
-				}
+				desired = idx + (dir == MOVE_LEFT ? -1 : 1);
-				return seat_get_focus_inactive_view(seat, wrap_candidate);
-			}
-			struct sway_container *next =
-				get_swayc_in_output_direction(adjacent, dir, seat);
-			if (next == NULL) {
-				return NULL;
-			}
-			struct sway_container *next_workspace = next;
-			if (next_workspace->type != C_WORKSPACE) {
-				next_workspace = container_parent(next_workspace, C_WORKSPACE);
-			}
-			sway_assert(next_workspace, "Next container has no workspace");
-			if (next_workspace->sway_workspace->fullscreen) {
-				return seat_get_focus_inactive(seat,
-						next_workspace->sway_workspace->fullscreen);
-			}
-			if (next->children && next->children->length) {
-				// TODO consider floating children as well
-				return seat_get_focus_inactive_view(seat, next);
-			} else {
-				return next;
 			}
 		} else {
-			if (dir == MOVE_LEFT || dir == MOVE_RIGHT) {
+			if (parent_layout == L_VERT || parent_layout == L_STACKED) {
-				if (parent->layout == L_HORIZ || parent->layout == L_TABBED) {
+				can_move = true;
-					can_move = true;
+				desired = idx + (dir == MOVE_UP ? -1 : 1);
-					desired = idx + (dir == MOVE_LEFT ? -1 : 1);
-				}
-			} else {
-				if (parent->layout == L_VERT || parent->layout == L_STACKED) {
-					can_move = true;
-					desired = idx + (dir == MOVE_UP ? -1 : 1);
-				}
 			}
 		}
 
 		if (can_move) {
-			// TODO handle floating
+			if (desired < 0 || desired >= siblings->length) {
-			if (desired < 0 || desired >= parent->children->length) {
 				can_move = false;
-				int len = parent->children->length;
+				int len = siblings->length;
 				if (config->focus_wrapping != WRAP_NO && !wrap_candidate
 						&& len > 1) {
 					if (desired < 0) {
-						wrap_candidate = parent->children->items[len-1];
+						wrap_candidate = siblings->items[len-1];
 					} else {
-						wrap_candidate = parent->children->items[0];
+						wrap_candidate = siblings->items[0];
 					}
 					if (config->focus_wrapping == WRAP_FORCE) {
-						return seat_get_focus_inactive_view(seat,
+						struct sway_container *c = seat_get_focus_inactive_view(
-								wrap_candidate);
+								seat, &wrap_candidate->node);
+						return &c->node;
 					}
 				}
 			} else {
-				struct sway_container *desired_con =
+				struct sway_container *desired_con = siblings->items[desired];
-					parent->children->items[desired];
+				struct sway_container *c = seat_get_focus_inactive_view(
-				wlr_log(WLR_DEBUG,
+						seat, &desired_con->node);
-					"cont %d-%p dir %i sibling %d: %p", idx,
+				return &c->node;
-					container, dir, desired, desired_con);
-				return seat_get_focus_inactive_view(seat, desired_con);
 			}
 		}
 
-		if (!can_move) {
+		current = current->parent;
-			container = parent;
-			parent = parent->parent;
-			if (!parent) {
-				// wrapping is the last chance
-				if (!wrap_candidate) {
-					return NULL;
-				}
-				return seat_get_focus_inactive_view(seat, wrap_candidate);
-			}
-		}
 	}
+
+	// Check a different output
+	struct sway_output *output = container->workspace->output;
+	struct sway_output *new_output = output_get_in_direction(output, dir);
+	if (new_output) {
+		return get_node_in_output_direction(new_output, dir);
+	}
+	return NULL;
 }
 
-static struct cmd_results *focus_mode(struct sway_container *con,
+static struct cmd_results *focus_mode(struct sway_workspace *ws,
 		struct sway_seat *seat, bool floating) {
-	struct sway_container *ws = con->type == C_WORKSPACE ?
-		con : container_parent(con, C_WORKSPACE);
-
-	// If the container is in a floating split container,
-	// operate on the split container instead of the child.
-	if (container_is_floating_or_child(con)) {
-		while (con->parent->type != C_WORKSPACE) {
-			con = con->parent;
-		}
-	}
-
 	struct sway_container *new_focus = NULL;
 	if (floating) {
 		new_focus = seat_get_focus_inactive_floating(seat, ws);
@@ -246,7 +176,7 @@ static struct cmd_results *focus_mode(struct sway_container *con,
 		new_focus = seat_get_focus_inactive_tiling(seat, ws);
 	}
 	if (new_focus) {
-		seat_set_focus(seat, new_focus);
+		seat_set_focus(seat, &new_focus->node);
 	} else {
 		return cmd_results_new(CMD_FAILURE, "focus",
 				"Failed to find a %s container in workspace",
@@ -255,14 +185,14 @@ static struct cmd_results *focus_mode(struct sway_container *con,
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }
 
-static struct cmd_results *focus_output(struct sway_container *con,
+static struct cmd_results *focus_output(struct sway_seat *seat,
-		struct sway_seat *seat, int argc, char **argv) {
+		int argc, char **argv) {
 	if (!argc) {
 		return cmd_results_new(CMD_INVALID, "focus",
 			"Expected 'focus output <direction|name>'");
 	}
 	char *identifier = join_args(argv, argc);
-	struct sway_container *output = output_by_name(identifier);
+	struct sway_output *output = output_by_name(identifier);
 
 	if (!output) {
 		enum movement_direction direction;
@@ -272,14 +202,13 @@ static struct cmd_results *focus_output(struct sway_container *con,
 			return cmd_results_new(CMD_INVALID, "focus",
 				"There is no output with that name");
 		}
-		struct sway_container *focus = seat_get_focus(seat);
+		struct sway_workspace *ws = seat_get_focused_workspace(seat);
-		focus = container_parent(focus, C_OUTPUT);
+		output = output_get_in_direction(ws->output, direction);
-		output = container_get_in_direction(focus, seat, direction);
 	}
 
 	free(identifier);
 	if (output) {
-		seat_set_focus(seat, seat_get_focus_inactive(seat, output));
+		seat_set_focus(seat, seat_get_focus_inactive(seat, &output->node));
 	}
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
@@ -289,29 +218,32 @@ struct cmd_results *cmd_focus(int argc, char **argv) {
 	if (config->reading || !config->active) {
 		return cmd_results_new(CMD_DEFER, NULL, NULL);
 	}
-	struct sway_container *con = config->handler_context.current_container;
+	struct sway_node *node = config->handler_context.node;
+	struct sway_container *container = config->handler_context.container;
+	struct sway_workspace *workspace = config->handler_context.workspace;
 	struct sway_seat *seat = config->handler_context.seat;
-	if (con->type < C_WORKSPACE) {
+	if (node->type < N_WORKSPACE) {
 		return cmd_results_new(CMD_FAILURE, "focus",
 			"Command 'focus' cannot be used above the workspace level");
 	}
 
 	if (argc == 0) {
-		seat_set_focus(seat, con);
+		seat_set_focus(seat, node);
 		return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 	}
 
 	if (strcmp(argv[0], "floating") == 0) {
-		return focus_mode(con, seat, true);
+		return focus_mode(workspace, seat, true);
 	} else if (strcmp(argv[0], "tiling") == 0) {
-		return focus_mode(con, seat, false);
+		return focus_mode(workspace, seat, false);
 	} else if (strcmp(argv[0], "mode_toggle") == 0) {
-		return focus_mode(con, seat, !container_is_floating_or_child(con));
+		bool floating = container && container_is_floating_or_child(container);
+		return focus_mode(workspace, seat, !floating);
 	}
 
 	if (strcmp(argv[0], "output") == 0) {
 		argc--; argv++;
-		return focus_output(con, seat, argc, argv);
+		return focus_output(seat, argc, argv);
 	}
 
 	enum movement_direction direction = 0;
@@ -321,8 +253,34 @@ struct cmd_results *cmd_focus(int argc, char **argv) {
 			"or 'focus output <direction|name>'");
 	}
 
-	struct sway_container *next_focus = container_get_in_direction(
+	if (direction == MOVE_CHILD) {
-			con, seat, direction);
+		struct sway_node *focus = seat_get_active_child(seat, node);
+		if (focus) {
+			seat_set_focus(seat, focus);
+		}
+		return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+	}
+
+	if (node->type == N_WORKSPACE) {
+		if (direction == MOVE_PARENT) {
+			return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+		}
+
+		// Jump to the next output
+		struct sway_output *new_output =
+			output_get_in_direction(workspace->output, direction);
+		if (!new_output) {
+			return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+		}
+
+		struct sway_node *node =
+			get_node_in_output_direction(new_output, direction);
+		seat_set_focus(seat, node);
+		return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+	}
+
+	struct sway_node *next_focus =
+		node_get_in_direction(container, seat, direction);
 	if (next_focus) {
 		seat_set_focus(seat, next_focus);
 	}

sway/commands/fullscreen.c

@@ -12,18 +12,18 @@ struct cmd_results *cmd_fullscreen(int argc, char **argv) {
 	if ((error = checkarg(argc, "fullscreen", EXPECTED_LESS_THAN, 2))) {
 		return error;
 	}
-	struct sway_container *container =
+	struct sway_node *node = config->handler_context.node;
-		config->handler_context.current_container;
+	struct sway_container *container = config->handler_context.container;
-	if (container->type == C_WORKSPACE && container->children->length == 0) {
+	struct sway_workspace *workspace = config->handler_context.workspace;
+	if (node->type == N_WORKSPACE && workspace->tiling->length == 0) {
 		return cmd_results_new(CMD_INVALID, "fullscreen",
 				"Can't fullscreen an empty workspace");
 	}
-	if (container->type == C_WORKSPACE) {
+	if (node->type == N_WORKSPACE) {
 		// Wrap the workspace's children in a container so we can fullscreen it
-		struct sway_container *workspace = container;
+		container = workspace_wrap_children(workspace);
-		container = workspace_wrap_children(container);
 		workspace->layout = L_HORIZ;
-		seat_set_focus(config->handler_context.seat, container);
+		seat_set_focus(config->handler_context.seat, &container->node);
 	}
 	bool enable = !container->is_fullscreen;
 
@@ -32,9 +32,7 @@ struct cmd_results *cmd_fullscreen(int argc, char **argv) {
 	}
 
 	container_set_fullscreen(container, enable);
-
+	arrange_workspace(workspace);
-	struct sway_container *workspace = container_parent(container, C_WORKSPACE);
-	arrange_windows(workspace->parent);
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }

sway/commands/gaps.c

@@ -2,6 +2,7 @@
 #include "sway/commands.h"
 #include "sway/config.h"
 #include "sway/tree/arrange.h"
+#include "sway/tree/workspace.h"
 #include "log.h"
 #include "stringop.h"
 #include <math.h>
@@ -43,7 +44,7 @@ struct cmd_results *cmd_gaps(int argc, char **argv) {
 			return cmd_results_new(CMD_INVALID, "gaps",
 				"gaps edge_gaps on|off|toggle");
 		}
-		arrange_windows(&root_container);
+		arrange_root();
 	} else {
 		int amount_idx = 0; // the current index in argv
 		enum gaps_op op = GAPS_OP_SET;
@@ -124,7 +125,7 @@ struct cmd_results *cmd_gaps(int argc, char **argv) {
 		if (amount_idx == 0) { // gaps <amount>
 			config->gaps_inner = val;
 			config->gaps_outer = val;
-			arrange_windows(&root_container);
+			arrange_root();
 			return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 		}
 		// Other variants. The middle-length variant (gaps inner|outer <amount>)
@@ -155,21 +156,27 @@ struct cmd_results *cmd_gaps(int argc, char **argv) {
 			} else {
 				config->gaps_outer = total;
 			}
-			arrange_windows(&root_container);
+			arrange_root();
 		} else {
-			struct sway_container *c =
+			if (scope == GAPS_SCOPE_WORKSPACE) {
-				config->handler_context.current_container;
+				struct sway_workspace *ws = config->handler_context.workspace;
-			if (scope == GAPS_SCOPE_WORKSPACE && c->type != C_WORKSPACE) {
+				ws->has_gaps = true;
-				c = container_parent(c, C_WORKSPACE);
+				if (inner) {
-			}
+					ws->gaps_inner = total;
-			c->has_gaps = true;
+				} else {
-			if (inner) {
+					ws->gaps_outer = total;
-				c->gaps_inner = total;
+				}
+				arrange_workspace(ws);
 			} else {
-				c->gaps_outer = total;
+				struct sway_container *c = config->handler_context.container;
+				c->has_gaps = true;
+				if (inner) {
+					c->gaps_inner = total;
+				} else {
+					c->gaps_outer = total;
+				}
+				arrange_workspace(c->workspace);
 			}
-
-			arrange_windows(c->parent ? c->parent : &root_container);
 		}
 	}
 

sway/commands/hide_edge_borders.c

@@ -5,8 +5,8 @@
 #include "sway/tree/view.h"
 
 static void _configure_view(struct sway_container *con, void *data) {
-	if (con->type == C_VIEW) {
+	if (con->view) {
-		view_autoconfigure(con->sway_view);
+		view_autoconfigure(con->view);
 	}
 }
 

sway/commands/kill.c

@@ -2,15 +2,27 @@
 #include "log.h"
 #include "sway/input/input-manager.h"
 #include "sway/input/seat.h"
-#include "sway/tree/view.h"
 #include "sway/tree/container.h"
+#include "sway/tree/view.h"
+#include "sway/tree/workspace.h"
 #include "sway/commands.h"
 
-struct cmd_results *cmd_kill(int argc, char **argv) {
+static void close_container_iterator(struct sway_container *con, void *data) {
-	struct sway_container *con =
+	if (con->view) {
-		config->handler_context.current_container;
+		view_close(con->view);
+	}
+}
 
-	container_close(con);
+struct cmd_results *cmd_kill(int argc, char **argv) {
+	struct sway_container *con = config->handler_context.container;
+	struct sway_workspace *ws = config->handler_context.workspace;
+
+	if (con) {
+		close_container_iterator(con, NULL);
+		container_for_each_child(con, close_container_iterator, NULL);
+	} else {
+		workspace_for_each_container(ws, close_container_iterator, NULL);
+	}
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }

sway/commands/layout.c

@@ -4,21 +4,20 @@
 #include "sway/commands.h"
 #include "sway/tree/arrange.h"
 #include "sway/tree/container.h"
+#include "sway/tree/workspace.h"
 #include "log.h"
 
-static bool parse_layout_string(char *s, enum sway_container_layout *ptr) {
+static enum sway_container_layout parse_layout_string(char *s) {
 	if (strcasecmp(s, "splith") == 0) {
-		*ptr = L_HORIZ;
+		return L_HORIZ;
 	} else if (strcasecmp(s, "splitv") == 0) {
-		*ptr = L_VERT;
+		return L_VERT;
 	} else if (strcasecmp(s, "tabbed") == 0) {
-		*ptr = L_TABBED;
+		return L_TABBED;
 	} else if (strcasecmp(s, "stacking") == 0) {
-		*ptr = L_STACKED;
+		return L_STACKED;
-	} else {
-		return false;
 	}
-	return true;
+	return L_NONE;
 }
 
 static const char* expected_syntax =
@@ -26,85 +25,129 @@ static const char* expected_syntax =
 	"'layout toggle [split|all]' or "
 	"'layout toggle [split|tabbed|stacking|splitv|splith] [split|tabbed|stacking|splitv|splith]...'";
 
+static enum sway_container_layout get_layout_toggle(int argc, char **argv,
+		enum sway_container_layout layout,
+		enum sway_container_layout prev_split_layout) {
+	// "layout toggle"
+	if (argc == 0) {
+		return layout == L_HORIZ ? L_VERT : L_HORIZ;
+	}
+
+	if (argc == 2) {
+		// "layout toggle split" (same as "layout toggle")
+		if (strcasecmp(argv[1], "split") == 0) {
+			return layout == L_HORIZ ? L_VERT : L_HORIZ;
+		}
+		// "layout toggle all"
+		if (strcasecmp(argv[1], "all") == 0) {
+			return layout == L_HORIZ ? L_VERT :
+				layout == L_VERT ? L_STACKED :
+				layout == L_STACKED ? L_TABBED : L_HORIZ;
+		}
+		return L_NONE;
+	}
+
+	enum sway_container_layout parsed;
+	int curr = 1;
+	for (; curr < argc; curr++) {
+		parsed = parse_layout_string(argv[curr]);
+		if (parsed == layout || (strcmp(argv[curr], "split") == 0 &&
+				 (layout == L_VERT || layout == L_HORIZ))) {
+			break;
+		}
+	}
+	for (int i = curr + 1; i != curr; ++i) {
+		// cycle round to find next valid layout
+		if (i >= argc) {
+			i = 1;
+		}
+		parsed = parse_layout_string(argv[i]);
+		if (parsed != L_NONE) {
+			return parsed;
+		}
+		if (strcmp(argv[i], "split") == 0) {
+			return layout == L_HORIZ ? L_VERT :
+				layout == L_VERT ? L_HORIZ : prev_split_layout;
+		}
+		// invalid layout strings are silently ignored
+	}
+	return L_NONE;
+}
+
+static enum sway_container_layout get_layout(int argc, char **argv,
+		enum sway_container_layout layout,
+		enum sway_container_layout prev_split_layout) {
+	// Check if assigned directly
+	enum sway_container_layout parsed = parse_layout_string(argv[0]);
+	if (parsed != L_NONE) {
+		return parsed;
+	}
+
+	if (strcasecmp(argv[0], "default") == 0) {
+		return prev_split_layout;
+	}
+
+	if (strcasecmp(argv[0], "toggle") == 0) {
+		return get_layout_toggle(argc, argv, layout, prev_split_layout);
+	}
+
+	return L_NONE;
+}
+
 struct cmd_results *cmd_layout(int argc, char **argv) {
 	struct cmd_results *error = NULL;
 	if ((error = checkarg(argc, "layout", EXPECTED_MORE_THAN, 0))) {
 		return error;
 	}
-	struct sway_container *parent = config->handler_context.current_container;
+	struct sway_container *container = config->handler_context.container;
+	struct sway_workspace *workspace = config->handler_context.workspace;
 
-	if (container_is_floating(parent)) {
+	if (container && container_is_floating(container)) {
 		return cmd_results_new(CMD_FAILURE, "layout",
 				"Unable to change layout of floating windows");
 	}
 
-	while (parent->type == C_VIEW) {
+	// Typically we change the layout of the current container, but if the
-		parent = parent->parent;
+	// current container is a view (it usually is) then we'll change the layout
+	// of the parent instead, as it doesn't make sense for views to have layout.
+	if (container && container->view) {
+		container = container->parent;
 	}
 
-	enum sway_container_layout prev = parent->layout;
+	// We could be working with a container OR a workspace. These are different
-	bool assigned_directly = parse_layout_string(argv[0], &parent->layout);
+	// structures, so we set up pointers to they layouts so we can refer them in
-	if (!assigned_directly) {
+	// an abstract way.
-		if (strcasecmp(argv[0], "default") == 0) {
+	enum sway_container_layout new_layout = L_NONE;
-			parent->layout = parent->prev_split_layout;
+	enum sway_container_layout old_layout = L_NONE;
-		} else if (strcasecmp(argv[0], "toggle") == 0) {
+	if (container) {
-			if (argc == 1) {
+		old_layout = container->layout;
-				parent->layout =
+		new_layout = get_layout(argc, argv,
-					parent->layout == L_STACKED ? L_TABBED :
+				container->layout, container->prev_split_layout);
-					parent->layout == L_TABBED ? parent->prev_split_layout : L_STACKED;
+	} else {
-			} else if (argc == 2) {
+		old_layout = workspace->layout;
-				if (strcasecmp(argv[1], "all") == 0) {
+		new_layout = get_layout(argc, argv,
-					parent->layout =
+				workspace->layout, workspace->prev_split_layout);
-						parent->layout == L_HORIZ ? L_VERT :
+	}
-						parent->layout == L_VERT ? L_STACKED :
+	if (new_layout == L_NONE) {
-						parent->layout == L_STACKED ? L_TABBED : L_HORIZ;
+		return cmd_results_new(CMD_INVALID, "layout", expected_syntax);
-				} else if (strcasecmp(argv[1], "split") == 0) {
+	}
-					parent->layout =
+	if (new_layout != old_layout) {
-						parent->layout == L_HORIZ ? L_VERT :
+		if (container) {
-						parent->layout == L_VERT ? L_HORIZ : parent->prev_split_layout;
+			if (old_layout != L_TABBED && old_layout != L_STACKED) {
-				} else {
+				container->prev_split_layout = old_layout;
-					return cmd_results_new(CMD_INVALID, "layout", expected_syntax);
-				}
-			} else {
-				enum sway_container_layout parsed_layout;
-				int curr = 1;
-				for (; curr < argc; curr++) {
-					bool valid = parse_layout_string(argv[curr], &parsed_layout);
-					if ((valid && parsed_layout == parent->layout) ||
-							(strcmp(argv[curr], "split") == 0 &&
-							(parent->layout == L_VERT || parent->layout == L_HORIZ))) {
-						break;
-					}
-				}
-				for (int i = curr + 1; i != curr; ++i) {
-					// cycle round to find next valid layout
-					if (i >= argc) {
-						i = 1;
-					}
-					if (parse_layout_string(argv[i], &parent->layout)) {
-						break;
-					} else if (strcmp(argv[i], "split") == 0) {
-						parent->layout =
-							parent->layout == L_HORIZ ? L_VERT :
-							parent->layout == L_VERT ? L_HORIZ : parent->prev_split_layout;
-						break;
-					} // invalid layout strings are silently ignored
-				}
 			}
+			container->layout = new_layout;
+			container_update_representation(container);
+			arrange_container(container);
 		} else {
-			return cmd_results_new(CMD_INVALID, "layout", expected_syntax);
+			if (old_layout != L_TABBED && old_layout != L_STACKED) {
+				workspace->prev_split_layout = old_layout;
+			}
+			workspace->layout = new_layout;
+			workspace_update_representation(workspace);
+			arrange_workspace(workspace);
 		}
 	}
-	if (parent->layout == L_NONE) {
-		parent->layout = container_get_default_layout(parent);
-	}
-	if (prev != parent->layout) {
-		if (prev != L_TABBED && prev != L_STACKED) {
-			parent->prev_split_layout = prev;
-		}
-		container_notify_subtree_changed(parent);
-		arrange_windows(parent->parent);
-	}
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }

sway/commands/mark.c

@@ -18,13 +18,12 @@ struct cmd_results *cmd_mark(int argc, char **argv) {
 	if ((error = checkarg(argc, "mark", EXPECTED_AT_LEAST, 1))) {
 		return error;
 	}
-	struct sway_container *container =
+	struct sway_container *container = config->handler_context.container;
-		config->handler_context.current_container;
+	if (!container->view) {
-	if (container->type != C_VIEW) {
 		return cmd_results_new(CMD_INVALID, "mark",
 				"Only views can have marks");
 	}
-	struct sway_view *view = container->sway_view;
+	struct sway_view *view = container->view;
 
 	bool add = false, toggle = false;
 	while (argc > 0 && strncmp(*argv, "--", 2) == 0) {

sway/commands/opacity.c

@@ -19,8 +19,7 @@ struct cmd_results *cmd_opacity(int argc, char **argv) {
 		return error;
 	}
 
-	struct sway_container *con =
+	struct sway_container *con = config->handler_context.container;
-		config->handler_context.current_container;
 
 	float opacity = 0.0f;
 

sway/commands/reload.c

@@ -42,7 +42,7 @@ struct cmd_results *cmd_reload(int argc, char **argv) {
 	}
 	list_free(bar_ids);
 
-	arrange_windows(&root_container);
+	arrange_root();
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }

sway/commands/rename.c

@@ -25,14 +25,11 @@ struct cmd_results *cmd_rename(int argc, char **argv) {
 	}
 
 	int argn = 1;
-	struct sway_container *workspace;
+	struct sway_workspace *workspace = NULL;
 
 	if (strcasecmp(argv[1], "to") == 0) {
 		// 'rename workspace to new_name'
-		workspace = config->handler_context.current_container;
+		workspace = config->handler_context.workspace;
-		if (workspace->type != C_WORKSPACE) {
-			workspace = container_parent(workspace, C_WORKSPACE);
-		}
 	} else if (strcasecmp(argv[1], "number") == 0) {
 		// 'rename workspace number x to new_name'
 		if (!isdigit(argv[2][0])) {
@@ -78,7 +75,7 @@ struct cmd_results *cmd_rename(int argc, char **argv) {
 		return cmd_results_new(CMD_INVALID, "rename",
 				"Cannot use special workspace name '%s'", argv[argn]);
 	}
-	struct sway_container *tmp_workspace = workspace_by_name(new_name);
+	struct sway_workspace *tmp_workspace = workspace_by_name(new_name);
 	if (tmp_workspace) {
 		free(new_name);
 		return cmd_results_new(CMD_INVALID, "rename",
@@ -89,7 +86,7 @@ struct cmd_results *cmd_rename(int argc, char **argv) {
 	free(workspace->name);
 	workspace->name = new_name;
 
-	output_sort_workspaces(workspace->parent);
+	output_sort_workspaces(workspace->output);
 	ipc_event_workspace(NULL, workspace, "rename");
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);

sway/commands/resize.c

@@ -10,6 +10,7 @@
 #include "sway/commands.h"
 #include "sway/tree/arrange.h"
 #include "sway/tree/view.h"
+#include "sway/tree/workspace.h"
 #include "log.h"
 
 static const int MIN_SANE_W = 100, MIN_SANE_H = 60;
@@ -75,7 +76,7 @@ static int parse_resize_amount(int argc, char **argv,
 
 static void calculate_constraints(int *min_width, int *max_width,
 		int *min_height, int *max_height) {
-	struct sway_container *con = config->handler_context.current_container;
+	struct sway_container *con = config->handler_context.container;
 
 	if (config->floating_minimum_width == -1) { // no minimum
 		*min_width = 0;
@@ -96,8 +97,7 @@ static void calculate_constraints(int *min_width, int *max_width,
 	if (config->floating_maximum_width == -1) { // no maximum
 		*max_width = INT_MAX;
 	} else if (config->floating_maximum_width == 0) { // automatic
-		struct sway_container *ws = container_parent(con, C_WORKSPACE);
+		*max_width = con->workspace->width;
-		*max_width = ws->width;
 	} else {
 		*max_width = config->floating_maximum_width;
 	}
@@ -105,8 +105,7 @@ static void calculate_constraints(int *min_width, int *max_width,
 	if (config->floating_maximum_height == -1) { // no maximum
 		*max_height = INT_MAX;
 	} else if (config->floating_maximum_height == 0) { // automatic
-		struct sway_container *ws = container_parent(con, C_WORKSPACE);
+		*max_height = con->workspace->height;
-		*max_height = ws->height;
 	} else {
 		*max_height = config->floating_maximum_height;
 	}
@@ -191,11 +190,11 @@ static void resize_tiled(struct sway_container *parent, int amount,
 		normalize_axis(axis) == RESIZE_AXIS_HORIZONTAL ? L_HORIZ : L_VERT;
 	int minor_weight = 0;
 	int major_weight = 0;
-	while (parent->parent) {
+	while (parent) {
-		struct sway_container *next = parent->parent;
+		list_t *siblings = container_get_siblings(parent);
-		if (next->layout == parallel_layout) {
+		if (container_parent_layout(parent) == parallel_layout) {
-			for (int i = 0; i < next->children->length; i++) {
+			for (int i = 0; i < siblings->length; i++) {
-				struct sway_container *sibling = next->children->items[i];
+				struct sway_container *sibling = siblings->items[i];
 
 				int sibling_pos = parallel_coord(sibling, axis);
 				int focused_pos = parallel_coord(focused, axis);
@@ -213,17 +212,13 @@ static void resize_tiled(struct sway_container *parent, int amount,
 				break;
 			}
 		}
-		parent = next;
+		parent = parent->parent;
 	}
-
+	if (!parent) {
-	if (parent->type == C_ROOT) {
+		// Can't resize in this direction
 		return;
 	}
 
-	wlr_log(WLR_DEBUG,
-			"Found the proper parent: %p. It has %d l conts, and %d r conts",
-			parent->parent, minor_weight, major_weight);
-
 	// Implement up/down/left/right direction by zeroing one of the weights,
 	// then setting the axis to be horizontal or vertical
 	if (axis == RESIZE_AXIS_UP || axis == RESIZE_AXIS_LEFT) {
@@ -237,9 +232,10 @@ static void resize_tiled(struct sway_container *parent, int amount,
 
 	//TODO: Ensure rounding is done in such a way that there are NO pixel leaks
 	// ^ ?????
+	list_t *siblings = container_get_siblings(parent);
 
-	for (int i = 0; i < parent->parent->children->length; i++) {
+	for (int i = 0; i < siblings->length; i++) {
-		struct sway_container *sibling = parent->parent->children->items[i];
+		struct sway_container *sibling = siblings->items[i];
 
 		int sibling_pos = parallel_coord(sibling, axis);
 		int focused_pos = parallel_coord(focused, axis);
@@ -277,8 +273,8 @@ static void resize_tiled(struct sway_container *parent, int amount,
 	enum wlr_edges major_edge = axis == RESIZE_AXIS_HORIZONTAL ?
 		WLR_EDGE_RIGHT : WLR_EDGE_BOTTOM;
 
-	for (int i = 0; i < parent->parent->children->length; i++) {
+	for (int i = 0; i < siblings->length; i++) {
-		struct sway_container *sibling = parent->parent->children->items[i];
+		struct sway_container *sibling = siblings->items[i];
 
 		int sibling_pos = parallel_coord(sibling, axis);
 		int focused_pos = parallel_coord(focused, axis);
@@ -316,7 +312,11 @@ static void resize_tiled(struct sway_container *parent, int amount,
 		}
 	}
 
-	arrange_windows(parent->parent);
+	if (parent->parent) {
+		arrange_container(parent->parent);
+	} else {
+		arrange_workspace(parent->workspace);
+	}
 }
 
 void container_resize_tiled(struct sway_container *parent,
@@ -346,7 +346,7 @@ void container_resize_tiled(struct sway_container *parent,
  */
 static struct cmd_results *resize_adjust_floating(enum resize_axis axis,
 		struct resize_amount *amount) {
-	struct sway_container *con = config->handler_context.current_container;
+	struct sway_container *con = config->handler_context.container;
 	int grow_width = 0, grow_height = 0;
 	switch (axis) {
 	case RESIZE_AXIS_HORIZONTAL:
@@ -400,15 +400,15 @@ static struct cmd_results *resize_adjust_floating(enum resize_axis axis,
 	con->width += grow_width;
 	con->height += grow_height;
 
-	if (con->type == C_VIEW) {
+	if (con->view) {
-		struct sway_view *view = con->sway_view;
+		struct sway_view *view = con->view;
 		view->x += grow_x;
 		view->y += grow_y;
 		view->width += grow_width;
 		view->height += grow_height;
 	}
 
-	arrange_windows(con);
+	arrange_container(con);
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }
@@ -418,7 +418,7 @@ static struct cmd_results *resize_adjust_floating(enum resize_axis axis,
  */
 static struct cmd_results *resize_adjust_tiled(enum resize_axis axis,
 		struct resize_amount *amount) {
-	struct sway_container *current = config->handler_context.current_container;
+	struct sway_container *current = config->handler_context.container;
 
 	if (amount->unit == RESIZE_UNIT_DEFAULT) {
 		amount->unit = RESIZE_UNIT_PPT;
@@ -456,13 +456,15 @@ static struct cmd_results *resize_set_tiled(struct sway_container *con,
 				width->unit == RESIZE_UNIT_DEFAULT) {
 			// Convert to px
 			struct sway_container *parent = con->parent;
-			while (parent->type >= C_WORKSPACE && parent->layout != L_HORIZ) {
+			while (parent && parent->layout != L_HORIZ) {
 				parent = parent->parent;
 			}
-			if (parent->type >= C_WORKSPACE) {
+			if (parent) {
 				width->amount = parent->width * width->amount / 100;
-				width->unit = RESIZE_UNIT_PX;
+			} else {
+				width->amount = con->workspace->width * width->amount / 100;
 			}
+			width->unit = RESIZE_UNIT_PX;
 		}
 		if (width->unit == RESIZE_UNIT_PX) {
 			resize_tiled(con, width->amount - con->width,
@@ -475,13 +477,15 @@ static struct cmd_results *resize_set_tiled(struct sway_container *con,
 				height->unit == RESIZE_UNIT_DEFAULT) {
 			// Convert to px
 			struct sway_container *parent = con->parent;
-			while (parent->type >= C_WORKSPACE && parent->layout != L_VERT) {
+			while (parent && parent->layout != L_VERT) {
 				parent = parent->parent;
 			}
-			if (parent->type >= C_WORKSPACE) {
+			if (parent) {
 				height->amount = parent->height * height->amount / 100;
-				height->unit = RESIZE_UNIT_PX;
+			} else {
+				height->amount = con->workspace->height * height->amount / 100;
 			}
+			height->unit = RESIZE_UNIT_PX;
 		}
 		if (height->unit == RESIZE_UNIT_PX) {
 			resize_tiled(con, height->amount - con->height,
@@ -508,15 +512,15 @@ static struct cmd_results *resize_set_floating(struct sway_container *con,
 	con->width = width->amount;
 	con->height = height->amount;
 
-	if (con->type == C_VIEW) {
+	if (con->view) {
-		struct sway_view *view = con->sway_view;
+		struct sway_view *view = con->view;
 		view->x -= grow_width / 2;
 		view->y -= grow_height / 2;
 		view->width += grow_width;
 		view->height += grow_height;
 	}
 
-	arrange_windows(con);
+	arrange_container(con);
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }
@@ -555,7 +559,7 @@ static struct cmd_results *cmd_resize_set(int argc, char **argv) {
 	}
 
 	// If 0, don't resize that dimension
-	struct sway_container *con = config->handler_context.current_container;
+	struct sway_container *con = config->handler_context.container;
 	if (width.amount <= 0) {
 		width.amount = con->width;
 	}
@@ -624,7 +628,7 @@ static struct cmd_results *cmd_resize_adjust(int argc, char **argv,
 	first_amount.amount *= multiplier;
 	second_amount.amount *= multiplier;
 
-	struct sway_container *con = config->handler_context.current_container;
+	struct sway_container *con = config->handler_context.container;
 	if (container_is_floating(con)) {
 		// Floating containers can only resize in px. Choose an amount which
 		// uses px, with fallback to an amount that specified no unit.
@@ -657,14 +661,10 @@ static struct cmd_results *cmd_resize_adjust(int argc, char **argv,
 }
 
 struct cmd_results *cmd_resize(int argc, char **argv) {
-	struct sway_container *current = config->handler_context.current_container;
+	struct sway_container *current = config->handler_context.container;
 	if (!current) {
 		return cmd_results_new(CMD_INVALID, "resize", "Cannot resize nothing");
 	}
-	if (current->type != C_VIEW && current->type != C_CONTAINER) {
-		return cmd_results_new(CMD_INVALID, "resize",
-				"Can only resize views/containers");
-	}
 
 	struct cmd_results *error;
 	if ((error = checkarg(argc, "resize", EXPECTED_AT_LEAST, 2))) {

sway/commands/scratchpad.c

@@ -9,36 +9,34 @@
 
 static void scratchpad_toggle_auto(void) {
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *focus = seat_get_focus(seat);
+	struct sway_container *focus = seat_get_focused_container(seat);
-	struct sway_container *ws = focus->type == C_WORKSPACE ?
+	struct sway_workspace *ws = seat_get_focused_workspace(seat);
-		focus : container_parent(focus, C_WORKSPACE);
 
 	// If the focus is in a floating split container,
 	// operate on the split container instead of the child.
-	if (container_is_floating_or_child(focus)) {
+	if (focus && container_is_floating_or_child(focus)) {
-		while (focus->parent->type != C_WORKSPACE) {
+		while (focus->parent) {
 			focus = focus->parent;
 		}
 	}
 
-
 	// Check if the currently focused window is a scratchpad window and should
 	// be hidden again.
-	if (focus->scratchpad) {
+	if (focus && focus->scratchpad) {
 		wlr_log(WLR_DEBUG, "Focus is a scratchpad window - hiding %s",
-				focus->name);
+				focus->title);
 		root_scratchpad_hide(focus);
 		return;
 	}
 
 	// Check if there is an unfocused scratchpad window on the current workspace
 	// and focus it.
-	for (int i = 0; i < ws->sway_workspace->floating->length; ++i) {
+	for (int i = 0; i < ws->floating->length; ++i) {
-		struct sway_container *floater = ws->sway_workspace->floating->items[i];
+		struct sway_container *floater = ws->floating->items[i];
 		if (floater->scratchpad && focus != floater) {
 			wlr_log(WLR_DEBUG,
 					"Focusing other scratchpad window (%s) in this workspace",
-					floater->name);
+					floater->title);
 			root_scratchpad_show(floater);
 			return;
 		}
@@ -46,25 +44,23 @@ static void scratchpad_toggle_auto(void) {
 
 	// Check if there is a visible scratchpad window on another workspace.
 	// In this case we move it to the current workspace.
-	for (int i = 0; i < root_container.sway_root->scratchpad->length; ++i) {
+	for (int i = 0; i < root->scratchpad->length; ++i) {
-		struct sway_container *con =
+		struct sway_container *con = root->scratchpad->items[i];
-			root_container.sway_root->scratchpad->items[i];
 		if (con->parent) {
 			wlr_log(WLR_DEBUG,
 					"Moving a visible scratchpad window (%s) to this workspace",
-					con->name);
+					con->title);
 			root_scratchpad_show(con);
 			return;
 		}
 	}
 
 	// Take the container at the bottom of the scratchpad list
-	if (!sway_assert(root_container.sway_root->scratchpad->length,
+	if (!sway_assert(root->scratchpad->length, "Scratchpad is empty")) {
-				"Scratchpad is empty")) {
 		return;
 	}
-	struct sway_container *con = root_container.sway_root->scratchpad->items[0];
+	struct sway_container *con = root->scratchpad->items[0];
-	wlr_log(WLR_DEBUG, "Showing %s from list", con->name);
+	wlr_log(WLR_DEBUG, "Showing %s from list", con->title);
 	root_scratchpad_show(con);
 }
 
@@ -74,7 +70,7 @@ static void scratchpad_toggle_container(struct sway_container *con) {
 	}
 
 	// Check if it matches a currently visible scratchpad window and hide it.
-	if (con->parent) {
+	if (con->workspace) {
 		root_scratchpad_hide(con);
 		return;
 	}
@@ -91,18 +87,18 @@ struct cmd_results *cmd_scratchpad(int argc, char **argv) {
 		return cmd_results_new(CMD_INVALID, "scratchpad",
 				"Expected 'scratchpad show'");
 	}
-	if (!root_container.sway_root->scratchpad->length) {
+	if (!root->scratchpad->length) {
 		return cmd_results_new(CMD_INVALID, "scratchpad",
 				"Scratchpad is empty");
 	}
 
 	if (config->handler_context.using_criteria) {
-		struct sway_container *con = config->handler_context.current_container;
+		struct sway_container *con = config->handler_context.container;
 
 		// If the container is in a floating split container,
 		// operate on the split container instead of the child.
 		if (container_is_floating_or_child(con)) {
-			while (con->parent->type != C_WORKSPACE) {
+			while (con->parent) {
 				con = con->parent;
 			}
 		}

sway/commands/seat/cursor.c

@@ -42,8 +42,8 @@ struct cmd_results *seat_cmd_cursor(int argc, char **argv) {
 			return cmd_results_new(CMD_INVALID, "cursor", expected_syntax);
 		}
 		// map absolute coords (0..1,0..1) to root container coords
-		float x = strtof(argv[1], NULL) / root_container.width;
+		float x = strtof(argv[1], NULL) / root->width;
-		float y = strtof(argv[2], NULL) / root_container.height;
+		float y = strtof(argv[2], NULL) / root->height;
 		wlr_cursor_warp_absolute(cursor->cursor, NULL, x, y);
 		cursor_send_pointer_motion(cursor, 0, true);
 	} else {

sway/commands/show_marks.c

@@ -11,8 +11,8 @@
 #include "util.h"
 
 static void rebuild_marks_iterator(struct sway_container *con, void *data) {
-	if (con->type == C_VIEW) {
+	if (con->view) {
-		view_update_marks_textures(con->sway_view);
+		view_update_marks_textures(con->view);
 	}
 }
 
@@ -28,9 +28,9 @@ struct cmd_results *cmd_show_marks(int argc, char **argv) {
 		root_for_each_container(rebuild_marks_iterator, NULL);
 	}
 
-	for (int i = 0; i < root_container.children->length; ++i) {
+	for (int i = 0; i < root->outputs->length; ++i) {
-		struct sway_container *con = root_container.children->items[i];
+		struct sway_output *output = root->outputs->items[i];
-		output_damage_whole(con->sway_output);
+		output_damage_whole(output);
 	}
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);

sway/commands/smart_gaps.c

@@ -23,7 +23,7 @@ struct cmd_results *cmd_smart_gaps(int argc, char **argv) {
 			"Expected 'smart_gaps <on|off>' ");
 	}
 
-	arrange_windows(&root_container);
+	arrange_root();
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }

sway/commands/split.c

@@ -4,15 +4,21 @@
 #include "sway/tree/arrange.h"
 #include "sway/tree/container.h"
 #include "sway/tree/view.h"
+#include "sway/tree/workspace.h"
 #include "sway/input/input-manager.h"
 #include "sway/input/seat.h"
 #include "log.h"
 
 static struct cmd_results *do_split(int layout) {
-	struct sway_container *con = config->handler_context.current_container;
+	struct sway_container *con = config->handler_context.container;
-	struct sway_container *parent = container_split(con, layout);
+	struct sway_workspace *ws = config->handler_context.workspace;
-	container_create_notify(parent);
+	if (con) {
-	arrange_windows(parent->parent);
+		container_split(con, layout);
+	} else {
+		workspace_split(ws, layout);
+	}
+
+	arrange_workspace(ws);
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }
@@ -29,10 +35,9 @@ struct cmd_results *cmd_split(int argc, char **argv) {
 		return do_split(L_HORIZ);
 	} else if (strcasecmp(argv[0], "t") == 0 ||
 			strcasecmp(argv[0], "toggle") == 0) {
-		struct sway_container *focused =
+		struct sway_container *focused = config->handler_context.container;
-			config->handler_context.current_container;
 
-		if (focused->parent->layout == L_VERT) {
+		if (focused && container_parent_layout(focused) == L_VERT) {
 			return do_split(L_HORIZ);
 		} else {
 			return do_split(L_VERT);
@@ -66,9 +71,9 @@ struct cmd_results *cmd_splitt(int argc, char **argv) {
 		return error;
 	}
 
-	struct sway_container *con = config->handler_context.current_container;
+	struct sway_container *con = config->handler_context.container;
 
-	if (con->parent->layout == L_VERT) {
+	if (con && container_parent_layout(con) == L_VERT) {
 		return do_split(L_HORIZ);
 	} else {
 		return do_split(L_VERT);

sway/commands/sticky.c

@@ -15,8 +15,7 @@ struct cmd_results *cmd_sticky(int argc, char **argv) {
 	if ((error = checkarg(argc, "sticky", EXPECTED_EQUAL_TO, 1))) {
 		return error;
 	}
-	struct sway_container *container =
+	struct sway_container *container = config->handler_context.container;
-		config->handler_context.current_container;
 	if (!container_is_floating(container)) {
 		return cmd_results_new(CMD_FAILURE, "sticky",
 			"Can't set sticky on a tiled container");
@@ -37,20 +36,16 @@ struct cmd_results *cmd_sticky(int argc, char **argv) {
 	container->is_sticky = wants_sticky;
 
 	if (wants_sticky) {
-		// move container to focused workspace
+		// move container to active workspace
-		struct sway_container *output = container_parent(container, C_OUTPUT);
+		struct sway_workspace *active_workspace =
-		struct sway_seat *seat = input_manager_current_seat(input_manager);
+			output_get_active_workspace(container->workspace->output);
-		struct sway_container *focus = seat_get_focus_inactive(seat, output);
+		if (container->workspace != active_workspace) {
-		struct sway_container *focused_workspace = container_parent(focus, C_WORKSPACE);
+			struct sway_workspace *old_workspace = container->workspace;
-		struct sway_container *current_workspace = container_parent(container, C_WORKSPACE);
+			container_detach(container);
-		if (current_workspace != focused_workspace) {
+			workspace_add_floating(active_workspace, container);
-			container_remove_child(container);
+			container_handle_fullscreen_reparent(container);
-			workspace_add_floating(focused_workspace, container);
+			arrange_workspace(active_workspace);
-			container_handle_fullscreen_reparent(container, current_workspace);
+			workspace_consider_destroy(old_workspace);
-			arrange_windows(focused_workspace);
-			if (!container_reap_empty(current_workspace)) {
-				arrange_windows(current_workspace);
-			}
 		}
 	}
 

sway/commands/swap.c

@@ -4,6 +4,7 @@
 #include "config.h"
 #include "log.h"
 #include "sway/commands.h"
+#include "sway/output.h"
 #include "sway/tree/arrange.h"
 #include "sway/tree/root.h"
 #include "sway/tree/view.h"
@@ -43,27 +44,28 @@ static void swap_focus(struct sway_container *con1,
 		struct sway_container *con2, struct sway_seat *seat,
 		struct sway_container *focus) {
 	if (focus == con1 || focus == con2) {
-		struct sway_container *ws1 = container_parent(con1, C_WORKSPACE);
+		struct sway_workspace *ws1 = con1->workspace;
-		struct sway_container *ws2 = container_parent(con2, C_WORKSPACE);
+		struct sway_workspace *ws2 = con2->workspace;
-		if (focus == con1 && (con2->parent->layout == L_TABBED
+		enum sway_container_layout layout1 = container_parent_layout(con1);
-					|| con2->parent->layout == L_STACKED)) {
+		enum sway_container_layout layout2 = container_parent_layout(con2);
+		if (focus == con1 && (layout2 == L_TABBED || layout2 == L_STACKED)) {
 			if (workspace_is_visible(ws2)) {
-				seat_set_focus_warp(seat, con2, false, true);
+				seat_set_focus_warp(seat, &con2->node, false, true);
 			}
-			seat_set_focus(seat, ws1 != ws2 ? con2 : con1);
+			seat_set_focus(seat, ws1 != ws2 ? &con2->node : &con1->node);
-		} else if (focus == con2 && (con1->parent->layout == L_TABBED
+		} else if (focus == con2 && (layout1 == L_TABBED
-					|| con1->parent->layout == L_STACKED)) {
+					|| layout1 == L_STACKED)) {
 			if (workspace_is_visible(ws1)) {
-				seat_set_focus_warp(seat, con1, false, true);
+				seat_set_focus_warp(seat, &con1->node, false, true);
 			}
-			seat_set_focus(seat, ws1 != ws2 ? con1 : con2);
+			seat_set_focus(seat, ws1 != ws2 ? &con1->node : &con2->node);
 		} else if (ws1 != ws2) {
-			seat_set_focus(seat, focus == con1 ? con2 : con1);
+			seat_set_focus(seat, focus == con1 ? &con2->node : &con1->node);
 		} else {
-			seat_set_focus(seat, focus);
+			seat_set_focus(seat, &focus->node);
 		}
 	} else {
-		seat_set_focus(seat, focus);
+		seat_set_focus(seat, &focus->node);
 	}
 }
 
@@ -72,10 +74,6 @@ static void container_swap(struct sway_container *con1,
 	if (!sway_assert(con1 && con2, "Cannot swap with nothing")) {
 		return;
 	}
-	if (!sway_assert(con1->type >= C_CONTAINER && con2->type >= C_CONTAINER,
-				"Can only swap containers and views")) {
-		return;
-	}
 	if (!sway_assert(!container_has_ancestor(con1, con2)
 				&& !container_has_ancestor(con2, con1),
 				"Cannot swap ancestor and descendant")) {
@@ -87,10 +85,11 @@ static void container_swap(struct sway_container *con1,
 		return;
 	}
 
-	wlr_log(WLR_DEBUG, "Swapping containers %zu and %zu", con1->id, con2->id);
+	wlr_log(WLR_DEBUG, "Swapping containers %zu and %zu",
+			con1->node.id, con2->node.id);
 
-	int fs1 = con1->is_fullscreen;
+	bool fs1 = con1->is_fullscreen;
-	int fs2 = con2->is_fullscreen;
+	bool fs2 = con2->is_fullscreen;
 	if (fs1) {
 		container_set_fullscreen(con1, false);
 	}
@@ -99,13 +98,11 @@ static void container_swap(struct sway_container *con1,
 	}
 
 	struct sway_seat *seat = input_manager_get_default_seat(input_manager);
-	struct sway_container *focus = seat_get_focus(seat);
+	struct sway_container *focus = seat_get_focused_container(seat);
-	struct sway_container *vis1 = container_parent(
+	struct sway_workspace *vis1 =
-			seat_get_focus_inactive(seat, container_parent(con1, C_OUTPUT)),
+		output_get_active_workspace(con1->workspace->output);
-			C_WORKSPACE);
+	struct sway_workspace *vis2 =
-	struct sway_container *vis2 = container_parent(
+		output_get_active_workspace(con2->workspace->output);
-			seat_get_focus_inactive(seat, container_parent(con2, C_OUTPUT)),
-			C_WORKSPACE);
 
 	char *stored_prev_name = NULL;
 	if (prev_workspace_name) {
@@ -115,10 +112,10 @@ static void container_swap(struct sway_container *con1,
 	swap_places(con1, con2);
 
 	if (!workspace_is_visible(vis1)) {
-		seat_set_focus(seat, seat_get_focus_inactive(seat, vis1));
+		seat_set_focus(seat, seat_get_focus_inactive(seat, &vis1->node));
 	}
 	if (!workspace_is_visible(vis2)) {
-		seat_set_focus(seat, seat_get_focus_inactive(seat, vis2));
+		seat_set_focus(seat, seat_get_focus_inactive(seat, &vis2->node));
 	}
 
 	swap_focus(con1, con2, seat, focus);
@@ -137,23 +134,22 @@ static void container_swap(struct sway_container *con1,
 }
 
 static bool test_con_id(struct sway_container *container, void *con_id) {
-	return container->id == (size_t)con_id;
+	return container->node.id == (size_t)con_id;
 }
 
 static bool test_id(struct sway_container *container, void *id) {
 #ifdef HAVE_XWAYLAND
 	xcb_window_t *wid = id;
-	return (container->type == C_VIEW
+	return (container->view && container->view->type == SWAY_VIEW_XWAYLAND
-			&& container->sway_view->type == SWAY_VIEW_XWAYLAND
+			&& container->view->wlr_xwayland_surface->window_id == *wid);
-			&& container->sway_view->wlr_xwayland_surface->window_id == *wid);
 #else
 	return false;
 #endif
 }
 
 static bool test_mark(struct sway_container *container, void *mark) {
-	if (container->type == C_VIEW && container->sway_view->marks->length) {
+	if (container->view && container->view->marks->length) {
-		return !list_seq_find(container->sway_view->marks,
+		return !list_seq_find(container->view->marks,
 				(int (*)(const void *, const void *))strcmp, mark);
 	}
 	return false;
@@ -169,7 +165,7 @@ struct cmd_results *cmd_swap(int argc, char **argv) {
 		return cmd_results_new(CMD_INVALID, "swap", EXPECTED_SYNTAX);
 	}
 
-	struct sway_container *current = config->handler_context.current_container;
+	struct sway_container *current = config->handler_context.container;
 	struct sway_container *other;
 
 	char *value = join_args(argv + 3, argc - 3);
@@ -191,7 +187,7 @@ struct cmd_results *cmd_swap(int argc, char **argv) {
 	if (!other) {
 		error = cmd_results_new(CMD_FAILURE, "swap",
 				"Failed to find %s '%s'", argv[2], value);
-	} else if (current->type < C_CONTAINER || other->type < C_CONTAINER) {
+	} else if (!current) {
 		error = cmd_results_new(CMD_FAILURE, "swap",
 				"Can only swap with containers and views");
 	} else if (container_has_ancestor(current, other)
@@ -211,9 +207,9 @@ struct cmd_results *cmd_swap(int argc, char **argv) {
 
 	container_swap(current, other);
 
-	arrange_windows(current->parent);
+	arrange_node(node_get_parent(&current->node));
-	if (other->parent != current->parent) {
+	if (node_get_parent(&other->node) != node_get_parent(&current->node)) {
-		arrange_windows(other->parent);
+		arrange_node(node_get_parent(&other->node));
 	}
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);

sway/commands/title_format.c

@@ -11,13 +11,12 @@ struct cmd_results *cmd_title_format(int argc, char **argv) {
 	if ((error = checkarg(argc, "title_format", EXPECTED_AT_LEAST, 1))) {
 		return error;
 	}
-	struct sway_container *container =
+	struct sway_container *container = config->handler_context.container;
-		config->handler_context.current_container;
+	if (!container->view) {
-	if (container->type != C_VIEW) {
 		return cmd_results_new(CMD_INVALID, "title_format",
 				"Only views can have a title_format");
 	}
-	struct sway_view *view = container->sway_view;
+	struct sway_view *view = container->view;
 	char *format = join_args(argv, argc);
 	if (view->title_format) {
 		free(view->title_format);

sway/commands/unmark.c

@@ -9,9 +9,9 @@
 #include "stringop.h"
 
 static void remove_all_marks_iterator(struct sway_container *con, void *data) {
-	if (con->type == C_VIEW) {
+	if (con->view) {
-		view_clear_marks(con->sway_view);
+		view_clear_marks(con->view);
-		view_update_marks_textures(con->sway_view);
+		view_update_marks_textures(con->view);
 	}
 }
 
@@ -24,13 +24,12 @@ struct cmd_results *cmd_unmark(int argc, char **argv) {
 	// Determine the view
 	struct sway_view *view = NULL;
 	if (config->handler_context.using_criteria) {
-		struct sway_container *container =
+		struct sway_container *container = config->handler_context.container;
-			config->handler_context.current_container;
+		if (!container->view) {
-		if (container->type != C_VIEW) {
 			return cmd_results_new(CMD_INVALID, "unmark",
 					"Only views can have marks");
 		}
-		view = container->sway_view;
+		view = container->view;
 	}
 
 	// Determine the mark

sway/commands/urgent.c

@@ -11,13 +11,12 @@ struct cmd_results *cmd_urgent(int argc, char **argv) {
 	if ((error = checkarg(argc, "urgent", EXPECTED_EQUAL_TO, 1))) {
 		return error;
 	}
-	struct sway_container *container =
+	struct sway_container *container = config->handler_context.container;
-		config->handler_context.current_container;
+	if (!container->view) {
-	if (container->type != C_VIEW) {
 		return cmd_results_new(CMD_INVALID, "urgent",
 				"Only views can be urgent");
 	}
-	struct sway_view *view = container->sway_view;
+	struct sway_view *view = container->view;
 
 	if (strcmp(argv[0], "allow") == 0) {
 		view->allow_request_urgent = true;

sway/commands/workspace.c

@@ -58,7 +58,7 @@ struct cmd_results *cmd_workspace(int argc, char **argv) {
 		}
 
 
-		struct sway_container *ws = NULL;
+		struct sway_workspace *ws = NULL;
 		if (strcasecmp(argv[0], "number") == 0) {
 			if (argc < 2) {
 				return cmd_results_new(CMD_INVALID, "workspace",

sway/config.c

@@ -825,6 +825,6 @@ void config_update_font_height(bool recalculate) {
 	root_for_each_container(find_font_height_iterator, &recalculate);
 
 	if (config->font_height != prev_max_height) {
-		arrange_windows(&root_container);
+		arrange_root();
 	}
 }

sway/config/bar.c

@@ -12,6 +12,7 @@
 #include <strings.h>
 #include <signal.h>
 #include "sway/config.h"
+#include "sway/output.h"
 #include "stringop.h"
 #include "list.h"
 #include "log.h"
@@ -218,17 +219,6 @@ void invoke_swaybar(struct bar_config *bar) {
 	close(filedes[1]);
 }
 
-static bool active_output(const char *name) {
-	struct sway_container *cont = NULL;
-	for (int i = 0; i < root_container.children->length; ++i) {
-		cont = root_container.children->items[i];
-		if (cont->type == C_OUTPUT && strcasecmp(name, cont->name) == 0) {
-			return true;
-		}
-	}
-	return false;
-}
-
 void load_swaybars() {
 	for (int i = 0; i < config->bars->length; ++i) {
 		struct bar_config *bar = config->bars->items[i];
@@ -236,7 +226,7 @@ void load_swaybars() {
 		if (bar->outputs) {
 			for (int j = 0; j < bar->outputs->length; ++j) {
 				char *o = bar->outputs->items[j];
-				if (!strcmp(o, "*") || active_output(o)) {
+				if (!strcmp(o, "*") || output_by_name(o)) {
 					apply = true;
 					break;
 				}

sway/config/output.c

@@ -174,21 +174,16 @@ void terminate_swaybg(pid_t pid) {
 	}
 }
 
-void apply_output_config(struct output_config *oc, struct sway_container *output) {
+void apply_output_config(struct output_config *oc, struct sway_output *output) {
-	assert(output->type == C_OUTPUT);
+	struct wlr_output *wlr_output = output->wlr_output;
-
-	struct wlr_output_layout *output_layout =
-		root_container.sway_root->output_layout;
-	struct wlr_output *wlr_output = output->sway_output->wlr_output;
 
 	if (oc && oc->enabled == 0) {
-		if (output->sway_output->bg_pid != 0) {
+		if (output->bg_pid != 0) {
-			terminate_swaybg(output->sway_output->bg_pid);
+			terminate_swaybg(output->bg_pid);
-			output->sway_output->bg_pid = 0;
+			output->bg_pid = 0;
 		}
-		output_begin_destroy(output);
+		output_disable(output);
-		wlr_output_layout_remove(root_container.sway_root->output_layout,
+		wlr_output_layout_remove(root->output_layout, wlr_output);
-			wlr_output);
 		return;
 	}
 
@@ -213,21 +208,21 @@ void apply_output_config(struct output_config *oc, struct sway_container *output
 	// Find position for it
 	if (oc && (oc->x != -1 || oc->y != -1)) {
 		wlr_log(WLR_DEBUG, "Set %s position to %d, %d", oc->name, oc->x, oc->y);
-		wlr_output_layout_add(output_layout, wlr_output, oc->x, oc->y);
+		wlr_output_layout_add(root->output_layout, wlr_output, oc->x, oc->y);
 	} else {
-		wlr_output_layout_add_auto(output_layout, wlr_output);
+		wlr_output_layout_add_auto(root->output_layout, wlr_output);
 	}
 
 	int output_i;
-	for (output_i = 0; output_i < root_container.children->length; ++output_i) {
+	for (output_i = 0; output_i < root->outputs->length; ++output_i) {
-		if (root_container.children->items[output_i] == output) {
+		if (root->outputs->items[output_i] == output) {
 			break;
 		}
 	}
 
 	if (oc && oc->background) {
-		if (output->sway_output->bg_pid != 0) {
+		if (output->bg_pid != 0) {
-			terminate_swaybg(output->sway_output->bg_pid);
+			terminate_swaybg(output->bg_pid);
 		}
 
 		wlr_log(WLR_DEBUG, "Setting background for output %d to %s",
@@ -249,8 +244,8 @@ void apply_output_config(struct output_config *oc, struct sway_container *output
 		wlr_log(WLR_DEBUG, "-> %s", command);
 
 		char *const cmd[] = { "sh", "-c", command, NULL };
-		output->sway_output->bg_pid = fork();
+		output->bg_pid = fork();
-		if (output->sway_output->bg_pid == 0) {
+		if (output->bg_pid == 0) {
 			execvp(cmd[0], cmd);
 		} else {
 			free(command);
@@ -293,12 +288,11 @@ void apply_output_config_to_outputs(struct output_config *oc) {
 	bool wildcard = strcmp(oc->name, "*") == 0;
 	char id[128];
 	struct sway_output *sway_output;
-	wl_list_for_each(sway_output,
+	wl_list_for_each(sway_output, &root->all_outputs, link) {
-			&root_container.sway_root->all_outputs, link) {
 		char *name = sway_output->wlr_output->name;
 		output_get_identifier(id, sizeof(id), sway_output);
 		if (wildcard || !strcmp(name, oc->name) || !strcmp(id, oc->name)) {
-			if (!sway_output->swayc) {
+			if (!sway_output->enabled) {
 				if (!oc->enabled) {
 					if (!wildcard) {
 						break;
@@ -306,7 +300,7 @@ void apply_output_config_to_outputs(struct output_config *oc) {
 					continue;
 				}
 
-				output_enable(sway_output);
+				output_enable(sway_output, oc);
 			}
 
 			struct output_config *current = oc;
@@ -316,7 +310,7 @@ void apply_output_config_to_outputs(struct output_config *oc) {
 					current = tmp;
 				}
 			}
-			apply_output_config(current, sway_output->swayc);
+			apply_output_config(current, sway_output);
 
 			if (!wildcard) {
 				// Stop looking if the output config isn't applicable to all
@@ -354,8 +348,7 @@ static void default_output_config(struct output_config *oc,
 
 void create_default_output_configs(void) {
 	struct sway_output *sway_output;
-	wl_list_for_each(sway_output,
+	wl_list_for_each(sway_output, &root->all_outputs, link) {
-			&root_container.sway_root->all_outputs, link) {
 		char *name = sway_output->wlr_output->name;
 		struct output_config *oc = new_output_config(name);
 		default_output_config(oc, sway_output->wlr_output);

sway/criteria.c

@@ -9,6 +9,7 @@
 #include "sway/config.h"
 #include "sway/tree/root.h"
 #include "sway/tree/view.h"
+#include "sway/tree/workspace.h"
 #include "stringop.h"
 #include "list.h"
 #include "log.h"
@@ -87,12 +88,12 @@ static int cmp_urgent(const void *_a, const void *_b) {
 	return 0;
 }
 
-static void find_urgent_iterator(struct sway_container *swayc, void *data) {
+static void find_urgent_iterator(struct sway_container *con, void *data) {
-	if (swayc->type != C_VIEW || !view_is_urgent(swayc->sway_view)) {
+	if (!con->view || !view_is_urgent(con->view)) {
 		return;
 	}
 	list_t *urgent_views = data;
-	list_add(urgent_views, swayc->sway_view);
+	list_add(urgent_views, con->view);
 }
 
 static bool criteria_matches_view(struct criteria *criteria,
@@ -117,7 +118,7 @@ static bool criteria_matches_view(struct criteria *criteria,
 			return false;
 		}
 	}
-	
+
 	if (criteria->con_mark) {
 		bool exists = false;
 		for (int i = 0; i < view->marks->length; ++i) {
@@ -132,7 +133,7 @@ static bool criteria_matches_view(struct criteria *criteria,
 	}
 
 	if (criteria->con_id) { // Internal ID
-		if (!view->swayc || view->swayc->id != criteria->con_id) {
+		if (!view->container || view->container->node.id != criteria->con_id) {
 			return false;
 		}
 	}
@@ -174,13 +175,13 @@ static bool criteria_matches_view(struct criteria *criteria,
 #endif
 
 	if (criteria->floating) {
-		if (!container_is_floating(view->swayc)) {
+		if (!container_is_floating(view->container)) {
 			return false;
 		}
 	}
 
 	if (criteria->tiling) {
-		if (container_is_floating(view->swayc)) {
+		if (container_is_floating(view->container)) {
 			return false;
 		}
 	}
@@ -205,10 +206,7 @@ static bool criteria_matches_view(struct criteria *criteria,
 	}
 
 	if (criteria->workspace) {
-		if (!view->swayc) {
+		struct sway_workspace *ws = view->container->workspace;
-			return false;
-		}
-		struct sway_container *ws = container_parent(view->swayc, C_WORKSPACE);
 		if (!ws || strcmp(ws->name, criteria->workspace) != 0) {
 			return false;
 		}
@@ -237,9 +235,9 @@ struct match_data {
 static void criteria_get_views_iterator(struct sway_container *container,
 		void *data) {
 	struct match_data *match_data = data;
-	if (container->type == C_VIEW) {
+	if (container->view) {
-		if (criteria_matches_view(match_data->criteria, container->sway_view)) {
+		if (criteria_matches_view(match_data->criteria, container->view)) {
-			list_add(match_data->matches, container->sway_view);
+			list_add(match_data->matches, container->view);
 		}
 	}
 }
@@ -355,12 +353,12 @@ static enum criteria_token token_from_name(char *name) {
  */
 static char *get_focused_prop(enum criteria_token token) {
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *focus = seat_get_focus(seat);
+	struct sway_container *focus = seat_get_focused_container(seat);
 
-	if (!focus || focus->type != C_VIEW) {
+	if (!focus || !focus->view) {
 		return NULL;
 	}
-	struct sway_view *view = focus->sway_view;
+	struct sway_view *view = focus->view;
 	const char *value = NULL;
 
 	switch (token) {
@@ -374,18 +372,15 @@ static char *get_focused_prop(enum criteria_token token) {
 		value = view_get_title(view);
 		break;
 	case T_WORKSPACE:
-		{
+		if (focus->workspace) {
-			struct sway_container *ws = container_parent(focus, C_WORKSPACE);
+			value = focus->workspace->name;
-			if (ws) {
-				value = ws->name;
-			}
 		}
 		break;
 	case T_CON_ID:
-		if (view->swayc == NULL) {
+		if (view->container == NULL) {
 			return NULL;
 		}
-		size_t id = view->swayc->id;
+		size_t id = view->container->node.id;
 		size_t id_size = snprintf(NULL, 0, "%zu", id) + 1;
 		char *id_str = malloc(id_size);
 		snprintf(id_str, id_size, "%zu", id);

sway/debug-tree.c

@@ -10,6 +10,7 @@
 #include "sway/server.h"
 #include "sway/tree/container.h"
 #include "sway/tree/root.h"
+#include "sway/tree/workspace.h"
 #include "cairo.h"
 #include "config.h"
 #include "pango.h"
@@ -32,28 +33,78 @@ static const char *layout_to_str(enum sway_container_layout layout) {
 	return "L_NONE";
 }
 
-static int draw_container(cairo_t *cairo, struct sway_container *container,
+static char *get_string(struct sway_node *node) {
-		struct sway_container *focus, int x, int y) {
+	char *buffer = malloc(512);
+	switch (node->type) {
+	case N_ROOT:
+		snprintf(buffer, 512, "N_ROOT id:%zd %.fx%.f@%.f,%.f", node->id,
+				root->width, root->height, root->x, root->y);
+		break;
+	case N_OUTPUT:
+		snprintf(buffer, 512, "N_OUTPUT id:%zd '%s' %dx%d@%d,%d", node->id,
+				node->sway_output->wlr_output->name,
+				node->sway_output->width,
+				node->sway_output->height,
+				node->sway_output->lx,
+				node->sway_output->ly);
+		break;
+	case N_WORKSPACE:
+		snprintf(buffer, 512, "N_WORKSPACE id:%zd '%s' %s %dx%d@%.f,%.f",
+				node->id, node->sway_workspace->name,
+				layout_to_str(node->sway_workspace->layout),
+				node->sway_workspace->width, node->sway_workspace->height,
+				node->sway_workspace->x, node->sway_workspace->y);
+		break;
+	case N_CONTAINER:
+		snprintf(buffer, 512, "N_CONTAINER id:%zd '%s' %s %.fx%.f@%.f,%.f",
+				node->id, node->sway_container->title,
+				layout_to_str(node->sway_container->layout),
+				node->sway_container->width, node->sway_container->height,
+				node->sway_container->x, node->sway_container->y);
+		break;
+	}
+	return buffer;
+}
+
+static list_t *get_children(struct sway_node *node) {
+	switch (node->type) {
+	case N_ROOT:
+		return root->outputs;
+	case N_OUTPUT:
+		return node->sway_output->workspaces;
+	case N_WORKSPACE:
+		return node->sway_workspace->tiling;
+	case N_CONTAINER:
+		return node->sway_container->children;
+	}
+	return NULL;
+}
+
+static int draw_node(cairo_t *cairo, struct sway_node *node,
+		struct sway_node *focus, int x, int y) {
 	int text_width, text_height;
+	char *buffer = get_string(node);
 	get_text_size(cairo, "monospace", &text_width, &text_height,
-		1, false, "%s id:%zd '%s' %s %.fx%.f@%.f,%.f",
+		1, false, buffer);
-		container_type_to_str(container->type), container->id, container->name,
-		layout_to_str(container->layout),
-		container->width, container->height, container->x, container->y);
 	cairo_save(cairo);
 	cairo_rectangle(cairo, x + 2, y, text_width - 2, text_height);
 	cairo_set_source_u32(cairo, 0xFFFFFFE0);
 	cairo_fill(cairo);
 	int height = text_height;
-	if (container->children) {
+	list_t *children = get_children(node);
-		for (int i = 0; i < container->children->length; ++i) {
+	if (children) {
-			struct sway_container *child = container->children->items[i];
+		for (int i = 0; i < children->length; ++i) {
-			if (child->parent == container) {
+			// This is really dirty - the list contains specific structs but
+			// we're casting them as nodes. This works because node is the first
+			// item in each specific struct. This is acceptable because this is
+			// debug code.
+			struct sway_node *child = children->items[i];
+			if (node_get_parent(child) == node) {
 				cairo_set_source_u32(cairo, 0x000000FF);
 			} else {
 				cairo_set_source_u32(cairo, 0xFF0000FF);
 			}
-			height += draw_container(cairo, child, focus, x + 10, y + height);
+			height += draw_node(cairo, child, focus, x + 10, y + height);
 		}
 	}
 	cairo_set_source_u32(cairo, 0xFFFFFFE0);
@@ -61,13 +112,11 @@ static int draw_container(cairo_t *cairo, struct sway_container *container,
 	cairo_fill(cairo);
 	cairo_restore(cairo);
 	cairo_move_to(cairo, x, y);
-	if (focus == container) {
+	if (focus == node) {
 		cairo_set_source_u32(cairo, 0x0000FFFF);
 	}
-	pango_printf(cairo, "monospace", 1, false, "%s id:%zd '%s' %s %.fx%.f@%.f,%.f",
+	pango_printf(cairo, "monospace", 1, false, buffer);
-		container_type_to_str(container->type), container->id, container->name,
+	free(buffer);
-		layout_to_str(container->layout),
-		container->width, container->height, container->x, container->y);
 	return height;
 }
 
@@ -77,13 +126,13 @@ void update_debug_tree() {
 	}
 
 	int width = 640, height = 480;
-	for (int i = 0; i < root_container.children->length; ++i) {
+	for (int i = 0; i < root->outputs->length; ++i) {
-		struct sway_container *container = root_container.children->items[i];
+		struct sway_output *output = root->outputs->items[i];
-		if (container->width > width) {
+		if (output->width > width) {
-			width = container->width;
+			width = output->width;
 		}
-		if (container->height > height) {
+		if (output->height > height) {
-			height = container->height;
+			height = output->height;
 		}
 	}
 	cairo_surface_t *surface =
@@ -91,28 +140,22 @@ void update_debug_tree() {
 	cairo_t *cairo = cairo_create(surface);
 	PangoContext *pango = pango_cairo_create_context(cairo);
 
-	struct sway_seat *seat = NULL;
+	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	wl_list_for_each(seat, &input_manager->seats, link) {
+	struct sway_node *focus = seat_get_focus(seat);
-		break;
-	}
 
-	struct sway_container *focus = NULL;
-	if (seat != NULL) {
-		focus = seat_get_focus(seat);
-	}
 	cairo_set_source_u32(cairo, 0x000000FF);
-	draw_container(cairo, &root_container, focus, 0, 0);
+	draw_node(cairo, &root->node, focus, 0, 0);
 
 	cairo_surface_flush(surface);
 	struct wlr_renderer *renderer = wlr_backend_get_renderer(server.backend);
-	if (root_container.sway_root->debug_tree) {
+	if (root->debug_tree) {
-		wlr_texture_destroy(root_container.sway_root->debug_tree);
+		wlr_texture_destroy(root->debug_tree);
 	}
 	unsigned char *data = cairo_image_surface_get_data(surface);
 	int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width);
 	struct wlr_texture *texture = wlr_texture_from_pixels(renderer,
 		WL_SHM_FORMAT_ARGB8888, stride, width, height, data);
-	root_container.sway_root->debug_tree = texture;
+	root->debug_tree = texture;
 	cairo_surface_destroy(surface);
 	g_object_unref(pango);
 	cairo_destroy(cairo);

sway/desktop/desktop.c

@@ -4,37 +4,32 @@
 
 void desktop_damage_surface(struct wlr_surface *surface, double lx, double ly,
 		bool whole) {
-	for (int i = 0; i < root_container.children->length; ++i) {
+	for (int i = 0; i < root->outputs->length; ++i) {
-		struct sway_container *cont = root_container.children->items[i];
+		struct sway_output *output = root->outputs->items[i];
-		if (cont->type == C_OUTPUT) {
+		output_damage_surface(output, lx - output->wlr_output->lx,
-			output_damage_surface(cont->sway_output,
+				ly - output->wlr_output->ly, surface, whole);
-				lx - cont->current.swayc_x, ly - cont->current.swayc_y,
-				surface, whole);
-		}
 	}
 }
 
 void desktop_damage_whole_container(struct sway_container *con) {
-	for (int i = 0; i < root_container.children->length; ++i) {
+	for (int i = 0; i < root->outputs->length; ++i) {
-		struct sway_container *cont = root_container.children->items[i];
+		struct sway_output *output = root->outputs->items[i];
-		if (cont->type == C_OUTPUT) {
+		output_damage_whole_container(output, con);
-			output_damage_whole_container(cont->sway_output, con);
-		}
 	}
 }
 
 void desktop_damage_box(struct wlr_box *box) {
-	for (int i = 0; i < root_container.children->length; ++i) {
+	for (int i = 0; i < root->outputs->length; ++i) {
-		struct sway_container *cont = root_container.children->items[i];
+		struct sway_output *output = root->outputs->items[i];
-		output_damage_box(cont->sway_output, box);
+		output_damage_box(output, box);
 	}
 }
 
 void desktop_damage_view(struct sway_view *view) {
-	desktop_damage_whole_container(view->swayc);
+	desktop_damage_whole_container(view->container);
 	struct wlr_box box = {
-		.x = view->swayc->current.view_x - view->geometry.x,
+		.x = view->container->current.view_x - view->geometry.x,
-		.y = view->swayc->current.view_y - view->geometry.y,
+		.y = view->container->current.view_y - view->geometry.y,
 		.width = view->surface->current.width,
 		.height = view->surface->current.height,
 	};

sway/desktop/layer_shell.c

@@ -14,6 +14,7 @@
 #include "sway/output.h"
 #include "sway/server.h"
 #include "sway/tree/arrange.h"
+#include "sway/tree/workspace.h"
 #include "log.h"
 
 static void apply_exclusive(struct wlr_box *usable_area,
@@ -176,7 +177,7 @@ void arrange_layers(struct sway_output *output) {
 				sizeof(struct wlr_box)) != 0) {
 		wlr_log(WLR_DEBUG, "Usable area changed, rearranging output");
 		memcpy(&output->usable_area, &usable_area, sizeof(struct wlr_box));
-		arrange_output(output->swayc);
+		arrange_output(output);
 	}
 
 	// Arrange non-exlusive surfaces from top->bottom
@@ -256,7 +257,7 @@ static void unmap(struct sway_layer_surface *sway_layer) {
 		return;
 	}
 	struct sway_output *output = wlr_output->data;
-	if (output == NULL || output->swayc == NULL) {
+	if (output == NULL) {
 		return;
 	}
 	output_damage_surface(output, sway_layer->geo.x, sway_layer->geo.y,
@@ -283,9 +284,9 @@ static void handle_destroy(struct wl_listener *listener, void *data) {
 	wl_list_remove(&sway_layer->surface_commit.link);
 	if (sway_layer->layer_surface->output != NULL) {
 		struct sway_output *output = sway_layer->layer_surface->output->data;
-		if (output != NULL && output->swayc != NULL) {
+		if (output != NULL) {
 			arrange_layers(output);
-			arrange_windows(output->swayc);
+			arrange_output(output);
 			transaction_commit_dirty();
 		}
 		wl_list_remove(&sway_layer->output_destroy.link);
@@ -332,23 +333,21 @@ void handle_layer_shell_surface(struct wl_listener *listener, void *data) {
 
 	if (!layer_surface->output) {
 		// Assign last active output
-		struct sway_container *output = NULL;
+		struct sway_output *output = NULL;
 		struct sway_seat *seat = input_manager_get_default_seat(input_manager);
 		if (seat) {
-			output = seat_get_focus_inactive(seat, &root_container);
+			struct sway_workspace *ws = seat_get_focused_workspace(seat);
+			output = ws->output;
 		}
 		if (!output) {
-			if (!sway_assert(root_container.children->length,
+			if (!sway_assert(root->outputs->length,
 						"cannot auto-assign output for layer")) {
 				wlr_layer_surface_close(layer_surface);
 				return;
 			}
-			output = root_container.children->items[0];
+			output = root->outputs->items[0];
 		}
-		if (output->type != C_OUTPUT) {
+		layer_surface->output = output->wlr_output;
-			output = container_parent(output, C_OUTPUT);
-		}
-		layer_surface->output = output->sway_output->wlr_output;
 	}
 
 	struct sway_layer_surface *sway_layer =

sway/desktop/output.c

@@ -28,10 +28,10 @@
 #include "sway/tree/view.h"
 #include "sway/tree/workspace.h"
 
-struct sway_container *output_by_name(const char *name) {
+struct sway_output *output_by_name(const char *name) {
-	for (int i = 0; i < root_container.children->length; ++i) {
+	for (int i = 0; i < root->outputs->length; ++i) {
-		struct sway_container *output = root_container.children->items[i];
+		struct sway_output *output = root->outputs->items[i];
-		if (strcasecmp(output->name, name) == 0) {
+		if (strcasecmp(output->wlr_output->name, name) == 0) {
 			return output;
 		}
 	}
@@ -98,8 +98,8 @@ static bool get_surface_box(struct surface_iterator_data *data,
 	wlr_box_rotated_bounds(&box, data->rotation, &rotated_box);
 
 	struct wlr_box output_box = {
-		.width = output->swayc->current.swayc_width,
+		.width = output->width,
-		.height = output->swayc->current.swayc_height,
+		.height = output->height,
 	};
 
 	struct wlr_box intersection;
@@ -145,12 +145,12 @@ void output_view_for_each_surface(struct sway_output *output,
 		.user_iterator = iterator,
 		.user_data = user_data,
 		.output = output,
-		.ox = view->swayc->current.view_x - output->swayc->current.swayc_x
+		.ox = view->container->current.view_x - output->wlr_output->lx
 			- view->geometry.x,
-		.oy = view->swayc->current.view_y - output->swayc->current.swayc_y
+		.oy = view->container->current.view_y - output->wlr_output->ly
 			- view->geometry.y,
-		.width = view->swayc->current.view_width,
+		.width = view->container->current.view_width,
-		.height = view->swayc->current.view_height,
+		.height = view->container->current.view_height,
 		.rotation = 0, // TODO
 	};
 
@@ -164,12 +164,12 @@ void output_view_for_each_popup(struct sway_output *output,
 		.user_iterator = iterator,
 		.user_data = user_data,
 		.output = output,
-		.ox = view->swayc->current.view_x - output->swayc->current.swayc_x
+		.ox = view->container->current.view_x - output->wlr_output->lx
 			- view->geometry.x,
-		.oy = view->swayc->current.view_y - output->swayc->current.swayc_y
+		.oy = view->container->current.view_y - output->wlr_output->ly
 			- view->geometry.y,
-		.width = view->swayc->current.view_width,
+		.width = view->container->current.view_width,
-		.height = view->swayc->current.view_height,
+		.height = view->container->current.view_height,
 		.rotation = 0, // TODO
 	};
 
@@ -197,8 +197,8 @@ void output_unmanaged_for_each_surface(struct sway_output *output,
 	wl_list_for_each(unmanaged_surface, unmanaged, link) {
 		struct wlr_xwayland_surface *xsurface =
 			unmanaged_surface->wlr_xwayland_surface;
-		double ox = unmanaged_surface->lx - output->swayc->current.swayc_x;
+		double ox = unmanaged_surface->lx - output->wlr_output->lx;
-		double oy = unmanaged_surface->ly - output->swayc->current.swayc_y;
+		double oy = unmanaged_surface->ly - output->wlr_output->ly;
 
 		output_surface_for_each_surface(output, xsurface->surface, ox, oy,
 			iterator, user_data);
@@ -211,8 +211,8 @@ void output_drag_icons_for_each_surface(struct sway_output *output,
 		void *user_data) {
 	struct sway_drag_icon *drag_icon;
 	wl_list_for_each(drag_icon, drag_icons, link) {
-		double ox = drag_icon->x - output->swayc->x;
+		double ox = drag_icon->x - output->wlr_output->lx;
-		double oy = drag_icon->y - output->swayc->y;
+		double oy = drag_icon->y - output->wlr_output->ly;
 
 		if (drag_icon->wlr_drag_icon->mapped) {
 			output_surface_for_each_surface(output,
@@ -229,19 +229,13 @@ static void scale_box(struct wlr_box *box, float scale) {
 	box->height *= scale;
 }
 
-struct sway_container *output_get_active_workspace(struct sway_output *output) {
+struct sway_workspace *output_get_active_workspace(struct sway_output *output) {
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *focus =
+	struct sway_node *focus = seat_get_active_child(seat, &output->node);
-		seat_get_focus_inactive(seat, output->swayc);
 	if (!focus) {
-		// We've never been to this output before
+		return output->workspaces->items[0];
-		focus = output->swayc->current.children->items[0];
 	}
-	struct sway_container *workspace = focus;
+	return focus->sway_workspace;
-	if (workspace->type != C_WORKSPACE) {
-		workspace = container_parent(workspace, C_WORKSPACE);
-	}
-	return workspace;
 }
 
 bool output_has_opaque_overlay_layer_surface(struct sway_output *output) {
@@ -255,8 +249,8 @@ bool output_has_opaque_overlay_layer_surface(struct sway_output *output) {
 		struct sway_layer_surface *sway_layer_surface =
 			layer_from_wlr_layer_surface(wlr_layer_surface);
 		pixman_box32_t output_box = {
-			.x2 = output->swayc->current.swayc_width,
+			.x2 = output->width,
-			.y2 = output->swayc->current.swayc_height,
+			.y2 = output->height,
 		};
 		pixman_region32_t surface_opaque_box;
 		pixman_region32_init(&surface_opaque_box);
@@ -307,15 +301,15 @@ struct send_frame_done_data {
 
 static void send_frame_done_container_iterator(struct sway_container *con,
 		void *_data) {
-	if (con->type != C_VIEW) {
+	if (!con->view) {
 		return;
 	}
-	if (!view_is_visible(con->sway_view)) {
+	if (!view_is_visible(con->view)) {
 		return;
 	}
 
 	struct send_frame_done_data *data = _data;
-	output_view_for_each_surface(data->output, con->sway_view,
+	output_view_for_each_surface(data->output, con->view,
 		send_frame_done_iterator, data->when);
 }
 
@@ -328,15 +322,14 @@ static void send_frame_done(struct sway_output *output, struct timespec *when) {
 		.output = output,
 		.when = when,
 	};
-	struct sway_container *workspace = output_get_active_workspace(output);
+	struct sway_workspace *workspace = output_get_active_workspace(output);
-	if (workspace->current.ws_fullscreen) {
+	if (workspace->current.fullscreen) {
 		send_frame_done_container_iterator(
-				workspace->current.ws_fullscreen, &data);
+				workspace->current.fullscreen, &data);
-		container_for_each_child(workspace->current.ws_fullscreen,
+		container_for_each_child(workspace->current.fullscreen,
 				send_frame_done_container_iterator, &data);
 #ifdef HAVE_XWAYLAND
-		send_frame_done_unmanaged(output,
+		send_frame_done_unmanaged(output, &root->xwayland_unmanaged, when);
-			&root_container.sway_root->xwayland_unmanaged, when);
 #endif
 	} else {
 		send_frame_done_layer(output,
@@ -348,8 +341,7 @@ static void send_frame_done(struct sway_output *output, struct timespec *when) {
 				send_frame_done_container_iterator, &data);
 
 #ifdef HAVE_XWAYLAND
-		send_frame_done_unmanaged(output,
+		send_frame_done_unmanaged(output, &root->xwayland_unmanaged, when);
-			&root_container.sway_root->xwayland_unmanaged, when);
 #endif
 		send_frame_done_layer(output,
 			&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP], when);
@@ -358,8 +350,7 @@ static void send_frame_done(struct sway_output *output, struct timespec *when) {
 send_frame_overlay:
 	send_frame_done_layer(output,
 		&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY], when);
-	send_frame_done_drag_icons(output, &root_container.sway_root->drag_icons,
+	send_frame_done_drag_icons(output, &root->drag_icons, when);
-		when);
 }
 
 static void damage_handle_frame(struct wl_listener *listener, void *data) {
@@ -391,7 +382,11 @@ static void damage_handle_frame(struct wl_listener *listener, void *data) {
 }
 
 void output_damage_whole(struct sway_output *output) {
-	wlr_output_damage_add_whole(output->damage);
+	// The output can exist with no wlr_output if it's just been disconnected
+	// and the transaction to evacuate it has't completed yet.
+	if (output && output->wlr_output) {
+		wlr_output_damage_add_whole(output->damage);
+	}
 }
 
 static void damage_surface_iterator(struct sway_output *output,
@@ -446,14 +441,9 @@ void output_damage_surface(struct sway_output *output, double ox, double oy,
 
 static void output_damage_view(struct sway_output *output,
 		struct sway_view *view, bool whole) {
-	if (!sway_assert(view->swayc != NULL, "expected a view in the tree")) {
-		return;
-	}
-
 	if (!view_is_visible(view)) {
 		return;
 	}
-
 	output_view_for_each_surface(output, view, damage_surface_iterator, &whole);
 }
 
@@ -466,31 +456,29 @@ void output_damage_from_view(struct sway_output *output,
 void output_damage_box(struct sway_output *output, struct wlr_box *_box) {
 	struct wlr_box box;
 	memcpy(&box, _box, sizeof(struct wlr_box));
-	box.x -= output->swayc->current.swayc_x;
+	box.x -= output->wlr_output->lx;
-	box.y -= output->swayc->current.swayc_y;
+	box.y -= output->wlr_output->ly;
 	scale_box(&box, output->wlr_output->scale);
 	wlr_output_damage_add_box(output->damage, &box);
 }
 
 static void output_damage_whole_container_iterator(struct sway_container *con,
 		void *data) {
-	struct sway_output *output = data;
+	if (!sway_assert(con->view, "expected a view")) {
-
-	if (!sway_assert(con->type == C_VIEW, "expected a view")) {
 		return;
 	}
-
+	struct sway_output *output = data;
-	output_damage_view(output, con->sway_view, true);
+	output_damage_view(output, con->view, true);
 }
 
 void output_damage_whole_container(struct sway_output *output,
 		struct sway_container *con) {
 	// Pad the box by 1px, because the width is a double and might be a fraction
 	struct wlr_box box = {
-		.x = con->current.swayc_x - output->wlr_output->lx - 1,
+		.x = con->current.con_x - output->wlr_output->lx - 1,
-		.y = con->current.swayc_y - output->wlr_output->ly - 1,
+		.y = con->current.con_y - output->wlr_output->ly - 1,
-		.width = con->current.swayc_width + 2,
+		.width = con->current.con_width + 2,
-		.height = con->current.swayc_height + 2,
+		.height = con->current.con_height + 2,
 	};
 	scale_box(&box, output->wlr_output->scale);
 	wlr_output_damage_add_box(output->damage, &box);
@@ -499,44 +487,48 @@ void output_damage_whole_container(struct sway_output *output,
 static void damage_handle_destroy(struct wl_listener *listener, void *data) {
 	struct sway_output *output =
 		wl_container_of(listener, output, damage_destroy);
-	output_begin_destroy(output->swayc);
+	output_disable(output);
+	transaction_commit_dirty();
 }
 
 static void handle_destroy(struct wl_listener *listener, void *data) {
 	struct sway_output *output = wl_container_of(listener, output, destroy);
 	wl_signal_emit(&output->events.destroy, output);
 
-	if (output->swayc) {
+	if (output->enabled) {
-		output_begin_destroy(output->swayc);
+		output_disable(output);
 	}
+	output_begin_destroy(output);
 
-	wl_list_remove(&output->link);
+	transaction_commit_dirty();
-	wl_list_remove(&output->destroy.link);
-	output->wlr_output->data = NULL;
-	free(output);
-
-	arrange_windows(&root_container);
 }
 
 static void handle_mode(struct wl_listener *listener, void *data) {
 	struct sway_output *output = wl_container_of(listener, output, mode);
 	arrange_layers(output);
-	arrange_windows(output->swayc);
+	arrange_output(output);
 	transaction_commit_dirty();
 }
 
 static void handle_transform(struct wl_listener *listener, void *data) {
 	struct sway_output *output = wl_container_of(listener, output, transform);
 	arrange_layers(output);
-	arrange_windows(output->swayc);
+	arrange_output(output);
 	transaction_commit_dirty();
 }
 
+static void update_textures(struct sway_container *con, void *data) {
+	container_update_title_textures(con);
+	if (con->view) {
+		view_update_marks_textures(con->view);
+	}
+}
+
 static void handle_scale(struct wl_listener *listener, void *data) {
 	struct sway_output *output = wl_container_of(listener, output, scale);
 	arrange_layers(output);
-	container_update_textures_recursive(output->swayc);
+	output_for_each_container(output, update_textures, NULL);
-	arrange_windows(output->swayc);
+	arrange_output(output);
 	transaction_commit_dirty();
 }
 
@@ -545,57 +537,27 @@ void handle_new_output(struct wl_listener *listener, void *data) {
 	struct wlr_output *wlr_output = data;
 	wlr_log(WLR_DEBUG, "New output %p: %s", wlr_output, wlr_output->name);
 
-	struct sway_output *output = calloc(1, sizeof(struct sway_output));
+	struct sway_output *output = output_create(wlr_output);
 	if (!output) {
 		return;
 	}
-	output->wlr_output = wlr_output;
-	wlr_output->data = output;
 	output->server = server;
 	output->damage = wlr_output_damage_create(wlr_output);
-
-	wl_signal_add(&wlr_output->events.destroy, &output->destroy);
 	output->destroy.notify = handle_destroy;
 
-	wl_list_insert(&root_container.sway_root->all_outputs, &output->link);
+	struct output_config *oc = output_find_config(output);
 
-	output_enable(output);
+	if (!oc || oc->enabled) {
-}
+		output_enable(output, oc);
-
-void output_enable(struct sway_output *output) {
-	struct wlr_output *wlr_output = output->wlr_output;
-
-	if (!sway_assert(output->swayc == NULL, "output is already enabled")) {
-		return;
 	}
 
-	output->swayc = output_create(output);
-	if (!output->swayc) {
-		// Output is disabled
-		return;
-	}
-
-	size_t len = sizeof(output->layers) / sizeof(output->layers[0]);
-	for (size_t i = 0; i < len; ++i) {
-		wl_list_init(&output->layers[i]);
-	}
-	wl_signal_init(&output->events.destroy);
-
-	input_manager_configure_xcursor(input_manager);
-
-	wl_signal_add(&wlr_output->events.mode, &output->mode);
-	output->mode.notify = handle_mode;
-	wl_signal_add(&wlr_output->events.transform, &output->transform);
-	output->transform.notify = handle_transform;
-	wl_signal_add(&wlr_output->events.scale, &output->scale);
-	output->scale.notify = handle_scale;
-
-	wl_signal_add(&output->damage->events.frame, &output->damage_frame);
-	output->damage_frame.notify = damage_handle_frame;
-	wl_signal_add(&output->damage->events.destroy, &output->damage_destroy);
-	output->damage_destroy.notify = damage_handle_destroy;
-
-	arrange_layers(output);
-	arrange_windows(&root_container);
 	transaction_commit_dirty();
 }
+
+void output_add_listeners(struct sway_output *output) {
+	output->mode.notify = handle_mode;
+	output->transform.notify = handle_transform;
+	output->scale.notify = handle_scale;
+	output->damage_frame.notify = damage_handle_frame;
+	output->damage_destroy.notify = damage_handle_destroy;
+}

sway/desktop/render.c

@@ -193,10 +193,10 @@ static void render_view_toplevels(struct sway_view *view,
 		.alpha = alpha,
 	};
 	// Render all toplevels without descending into popups
-	double ox =
+	double ox = view->container->current.view_x -
-		view->swayc->current.view_x - output->wlr_output->lx - view->geometry.x;
+		output->wlr_output->lx - view->geometry.x;
-	double oy =
+	double oy = view->container->current.view_y -
-		view->swayc->current.view_y - output->wlr_output->ly - view->geometry.y;
+		output->wlr_output->ly - view->geometry.y;
 	output_surface_for_each_surface(output, view->surface, ox, oy,
 			render_surface_iterator, &data);
 }
@@ -229,17 +229,17 @@ static void render_saved_view(struct sway_view *view,
 		return;
 	}
 	struct wlr_box box = {
-		.x = view->swayc->current.view_x - output->swayc->current.swayc_x -
+		.x = view->container->current.view_x - output->wlr_output->lx -
 			view->saved_geometry.x,
-		.y = view->swayc->current.view_y - output->swayc->current.swayc_y -
+		.y = view->container->current.view_y - output->wlr_output->ly -
 			view->saved_geometry.y,
 		.width = view->saved_buffer_width,
 		.height = view->saved_buffer_height,
 	};
 
 	struct wlr_box output_box = {
-		.width = output->swayc->current.swayc_width,
+		.width = output->width,
-		.height = output->swayc->current.swayc_height,
+		.height = output->height,
 	};
 
 	struct wlr_box intersection;
@@ -263,14 +263,14 @@ static void render_saved_view(struct sway_view *view,
  */
 static void render_view(struct sway_output *output, pixman_region32_t *damage,
 		struct sway_container *con, struct border_colors *colors) {
-	struct sway_view *view = con->sway_view;
+	struct sway_view *view = con->view;
 	if (view->saved_buffer) {
-		render_saved_view(view, output, damage, view->swayc->alpha);
+		render_saved_view(view, output, damage, view->container->alpha);
 	} else {
-		render_view_toplevels(view, output, damage, view->swayc->alpha);
+		render_view_toplevels(view, output, damage, view->container->alpha);
 	}
 
-	if (view->swayc->current.using_csd) {
+	if (view->container->current.using_csd) {
 		return;
 	}
 
@@ -283,7 +283,7 @@ static void render_view(struct sway_output *output, pixman_region32_t *damage,
 		if (state->border_left) {
 			memcpy(&color, colors->child_border, sizeof(float) * 4);
 			premultiply_alpha(color, con->alpha);
-			box.x = state->swayc_x;
+			box.x = state->con_x;
 			box.y = state->view_y;
 			box.width = state->border_thickness;
 			box.height = state->view_height;
@@ -291,9 +291,12 @@ static void render_view(struct sway_output *output, pixman_region32_t *damage,
 			render_rect(output->wlr_output, damage, &box, color);
 		}
 
+		list_t *siblings = container_get_current_siblings(con);
+		enum sway_container_layout layout =
+			container_current_parent_layout(con);
+
 		if (state->border_right) {
-			if (state->parent->current.children->length == 1
+			if (siblings->length == 1 && layout == L_HORIZ) {
-					&& state->parent->current.layout == L_HORIZ) {
 				memcpy(&color, colors->indicator, sizeof(float) * 4);
 			} else {
 				memcpy(&color, colors->child_border, sizeof(float) * 4);
@@ -308,16 +311,15 @@ static void render_view(struct sway_output *output, pixman_region32_t *damage,
 		}
 
 		if (state->border_bottom) {
-			if (state->parent->current.children->length == 1
+			if (siblings->length == 1 && layout == L_VERT) {
-					&& con->current.parent->current.layout == L_VERT) {
 				memcpy(&color, colors->indicator, sizeof(float) * 4);
 			} else {
 				memcpy(&color, colors->child_border, sizeof(float) * 4);
 			}
 			premultiply_alpha(color, con->alpha);
-			box.x = state->swayc_x;
+			box.x = state->con_x;
 			box.y = state->view_y + state->view_height;
-			box.width = state->swayc_width;
+			box.width = state->con_width;
 			box.height = state->border_thickness;
 			scale_box(&box, output_scale);
 			render_rect(output->wlr_output, damage, &box, color);
@@ -344,12 +346,12 @@ static void render_titlebar(struct sway_output *output,
 	float color[4];
 	struct sway_container_state *state = &con->current;
 	float output_scale = output->wlr_output->scale;
-	enum sway_container_layout layout = state->parent->current.layout;
+	enum sway_container_layout layout = container_current_parent_layout(con);
-	list_t *children = state->parent->current.children;
+	list_t *children = container_get_current_siblings(con);
 	bool is_last_child = children->length == 0 ||
 		children->items[children->length - 1] == con;
-	double output_x = output->swayc->current.swayc_x;
+	double output_x = output->wlr_output->lx;
-	double output_y = output->swayc->current.swayc_y;
+	double output_y = output->wlr_output->ly;
 
 	// Single pixel bar above title
 	memcpy(&color, colors->border, sizeof(float) * 4);
@@ -366,7 +368,7 @@ static void render_titlebar(struct sway_output *output,
 	bool connects_sides = false;
 	if (layout == L_HORIZ || layout == L_VERT ||
 			(layout == L_STACKED && is_last_child)) {
-		if (con->type == C_VIEW) {
+		if (con->view) {
 			left_offset = state->border_left * state->border_thickness;
 			right_offset = state->border_right * state->border_thickness;
 			connects_sides = true;
@@ -542,14 +544,22 @@ static void render_top_border(struct sway_output *output,
 	// Child border - top edge
 	memcpy(&color, colors->child_border, sizeof(float) * 4);
 	premultiply_alpha(color, con->alpha);
-	box.x = state->swayc_x;
+	box.x = state->con_x;
-	box.y = state->swayc_y;
+	box.y = state->con_y;
-	box.width = state->swayc_width;
+	box.width = state->con_width;
 	box.height = state->border_thickness;
 	scale_box(&box, output_scale);
 	render_rect(output->wlr_output, output_damage, &box, color);
 }
 
+struct parent_data {
+	enum sway_container_layout layout;
+	struct wlr_box box;
+	list_t *children;
+	bool focused;
+	struct sway_container *active_child;
+};
+
 static void render_container(struct sway_output *output,
 	pixman_region32_t *damage, struct sway_container *con, bool parent_focused);
 
@@ -559,14 +569,13 @@ static void render_container(struct sway_output *output,
  * Wrap child views in borders and leave child containers borderless because
  * they'll apply their own borders to their children.
  */
-static void render_container_simple(struct sway_output *output,
+static void render_containers_linear(struct sway_output *output,
-		pixman_region32_t *damage, struct sway_container *con,
+		pixman_region32_t *damage, struct parent_data *parent) {
-		bool parent_focused) {
+	for (int i = 0; i < parent->children->length; ++i) {
-	for (int i = 0; i < con->current.children->length; ++i) {
+		struct sway_container *child = parent->children->items[i];
-		struct sway_container *child = con->current.children->items[i];
 
-		if (child->type == C_VIEW) {
+		if (child->view) {
-			struct sway_view *view = child->sway_view;
+			struct sway_view *view = child->view;
 			struct border_colors *colors;
 			struct wlr_texture *title_texture;
 			struct wlr_texture *marks_texture;
@@ -576,11 +585,11 @@ static void render_container_simple(struct sway_output *output,
 				colors = &config->border_colors.urgent;
 				title_texture = child->title_urgent;
 				marks_texture = view->marks_urgent;
-			} else if (state->focused || parent_focused) {
+			} else if (state->focused || parent->focused) {
 				colors = &config->border_colors.focused;
 				title_texture = child->title_focused;
 				marks_texture = view->marks_focused;
-			} else if (con->current.focused_inactive_child == child) {
+			} else if (child == parent->active_child) {
 				colors = &config->border_colors.focused_inactive;
 				title_texture = child->title_focused_inactive;
 				marks_texture = view->marks_focused_inactive;
@@ -590,10 +599,10 @@ static void render_container_simple(struct sway_output *output,
 				marks_texture = view->marks_unfocused;
 			}
 
-			if (!view->swayc->current.using_csd) {
+			if (!view->container->current.using_csd) {
 				if (state->border == B_NORMAL) {
-					render_titlebar(output, damage, child, state->swayc_x,
+					render_titlebar(output, damage, child, state->con_x,
-							state->swayc_y, state->swayc_width, colors,
+							state->con_y, state->con_width, colors,
 							title_texture, marks_texture);
 				} else {
 					render_top_border(output, damage, child, colors);
@@ -602,7 +611,7 @@ static void render_container_simple(struct sway_output *output,
 			render_view(output, damage, child, colors);
 		} else {
 			render_container(output, damage, child,
-					parent_focused || child->current.focused);
+					parent->focused || child->current.focused);
 		}
 	}
 }
@@ -610,22 +619,19 @@ static void render_container_simple(struct sway_output *output,
 /**
  * Render a container's children using the L_TABBED layout.
  */
-static void render_container_tabbed(struct sway_output *output,
+static void render_containers_tabbed(struct sway_output *output,
-		pixman_region32_t *damage, struct sway_container *con,
+		pixman_region32_t *damage, struct parent_data *parent) {
-		bool parent_focused) {
+	if (!parent->children->length) {
-	if (!con->current.children->length) {
 		return;
 	}
-	struct sway_container_state *pstate = &con->current;
+	struct sway_container *current = parent->active_child;
-	struct sway_container *current = pstate->focused_inactive_child;
 	struct border_colors *current_colors = &config->border_colors.unfocused;
-
+	int tab_width = parent->box.width / parent->children->length;
-	int tab_width = (pstate->swayc_width) / pstate->children->length;
 
 	// Render tabs
-	for (int i = 0; i < pstate->children->length; ++i) {
+	for (int i = 0; i < parent->children->length; ++i) {
-		struct sway_container *child = pstate->children->items[i];
+		struct sway_container *child = parent->children->items[i];
-		struct sway_view *view = child->type == C_VIEW ? child->sway_view : NULL;
+		struct sway_view *view = child->view;
 		struct sway_container_state *cstate = &child->current;
 		struct border_colors *colors;
 		struct wlr_texture *title_texture;
@@ -637,11 +643,11 @@ static void render_container_tabbed(struct sway_output *output,
 			colors = &config->border_colors.urgent;
 			title_texture = child->title_urgent;
 			marks_texture = view ? view->marks_urgent : NULL;
-		} else if (cstate->focused || parent_focused) {
+		} else if (cstate->focused || parent->focused) {
 			colors = &config->border_colors.focused;
 			title_texture = child->title_focused;
 			marks_texture = view ? view->marks_focused : NULL;
-		} else if (child == pstate->focused_inactive_child) {
+		} else if (child == parent->active_child) {
 			colors = &config->border_colors.focused_inactive;
 			title_texture = child->title_focused_inactive;
 			marks_texture = view ? view->marks_focused_inactive : NULL;
@@ -651,14 +657,14 @@ static void render_container_tabbed(struct sway_output *output,
 			marks_texture = view ? view->marks_unfocused : NULL;
 		}
 
-		int x = cstate->swayc_x + tab_width * i;
+		int x = cstate->con_x + tab_width * i;
 
 		// Make last tab use the remaining width of the parent
-		if (i == pstate->children->length - 1) {
+		if (i == parent->children->length - 1) {
-			tab_width = pstate->swayc_width - tab_width * i;
+			tab_width = parent->box.width - tab_width * i;
 		}
 
-		render_titlebar(output, damage, child, x, pstate->swayc_y, tab_width,
+		render_titlebar(output, damage, child, x, parent->box.y, tab_width,
 				colors, title_texture, marks_texture);
 
 		if (child == current) {
@@ -667,33 +673,30 @@ static void render_container_tabbed(struct sway_output *output,
 	}
 
 	// Render surface and left/right/bottom borders
-	if (current->type == C_VIEW) {
+	if (current->view) {
 		render_view(output, damage, current, current_colors);
 	} else {
 		render_container(output, damage, current,
-				parent_focused || current->current.focused);
+				parent->focused || current->current.focused);
 	}
 }
 
 /**
  * Render a container's children using the L_STACKED layout.
  */
-static void render_container_stacked(struct sway_output *output,
+static void render_containers_stacked(struct sway_output *output,
-		pixman_region32_t *damage, struct sway_container *con,
+		pixman_region32_t *damage, struct parent_data *parent) {
-		bool parent_focused) {
+	if (!parent->children->length) {
-	if (!con->current.children->length) {
 		return;
 	}
-	struct sway_container_state *pstate = &con->current;
+	struct sway_container *current = parent->active_child;
-	struct sway_container *current = pstate->focused_inactive_child;
 	struct border_colors *current_colors = &config->border_colors.unfocused;
-
 	size_t titlebar_height = container_titlebar_height();
 
 	// Render titles
-	for (int i = 0; i < pstate->children->length; ++i) {
+	for (int i = 0; i < parent->children->length; ++i) {
-		struct sway_container *child = pstate->children->items[i];
+		struct sway_container *child = parent->children->items[i];
-		struct sway_view *view = child->type == C_VIEW ? child->sway_view : NULL;
+		struct sway_view *view = child->view;
 		struct sway_container_state *cstate = &child->current;
 		struct border_colors *colors;
 		struct wlr_texture *title_texture;
@@ -705,11 +708,11 @@ static void render_container_stacked(struct sway_output *output,
 			colors = &config->border_colors.urgent;
 			title_texture = child->title_urgent;
 			marks_texture = view ? view->marks_urgent : NULL;
-		} else if (cstate->focused || parent_focused) {
+		} else if (cstate->focused || parent->focused) {
 			colors = &config->border_colors.focused;
 			title_texture = child->title_focused;
 			marks_texture = view ? view->marks_focused : NULL;
-		} else if (child == pstate->focused_inactive_child) {
+		} else if (child == parent->active_child) {
 			colors = &config->border_colors.focused_inactive;
 			title_texture = child->title_focused_inactive;
 			marks_texture = view ? view->marks_focused_inactive : NULL;
@@ -719,9 +722,9 @@ static void render_container_stacked(struct sway_output *output,
 			marks_texture = view ? view->marks_unfocused : NULL;
 		}
 
-		int y = pstate->swayc_y + titlebar_height * i;
+		int y = parent->box.y + titlebar_height * i;
-		render_titlebar(output, damage, child, pstate->swayc_x, y,
+		render_titlebar(output, damage, child, parent->box.x, y,
-				pstate->swayc_width, colors, title_texture, marks_texture);
+				parent->box.width, colors, title_texture, marks_texture);
 
 		if (child == current) {
 			current_colors = colors;
@@ -729,36 +732,69 @@ static void render_container_stacked(struct sway_output *output,
 	}
 
 	// Render surface and left/right/bottom borders
-	if (current->type == C_VIEW) {
+	if (current->view) {
 		render_view(output, damage, current, current_colors);
 	} else {
 		render_container(output, damage, current,
-				parent_focused || current->current.focused);
+				parent->focused || current->current.focused);
+	}
+}
+
+static void render_containers(struct sway_output *output,
+		pixman_region32_t *damage, struct parent_data *parent) {
+	switch (parent->layout) {
+	case L_NONE:
+	case L_HORIZ:
+	case L_VERT:
+		render_containers_linear(output, damage, parent);
+		break;
+	case L_STACKED:
+		render_containers_stacked(output, damage, parent);
+		break;
+	case L_TABBED:
+		render_containers_tabbed(output, damage, parent);
+		break;
 	}
 }
 
 static void render_container(struct sway_output *output,
-		pixman_region32_t *damage, struct sway_container *con,
+		pixman_region32_t *damage, struct sway_container *con, bool focused) {
-		bool parent_focused) {
+	struct parent_data data = {
-	switch (con->current.layout) {
+		.layout = con->current.layout,
-	case L_NONE:
+		.box = {
-	case L_HORIZ:
+			.x = con->current.con_x,
-	case L_VERT:
+			.y = con->current.con_y,
-		render_container_simple(output, damage, con, parent_focused);
+			.width = con->current.con_width,
-		break;
+			.height = con->current.con_height,
-	case L_STACKED:
+		},
-		render_container_stacked(output, damage, con, parent_focused);
+		.children = con->current.children,
-		break;
+		.focused = focused,
-	case L_TABBED:
+		.active_child = con->current.focused_inactive_child,
-		render_container_tabbed(output, damage, con, parent_focused);
+	};
-		break;
+	render_containers(output, damage, &data);
-	}
+}
+
+static void render_workspace(struct sway_output *output,
+		pixman_region32_t *damage, struct sway_workspace *ws, bool focused) {
+	struct parent_data data = {
+		.layout = ws->current.layout,
+		.box = {
+			.x = ws->current.x,
+			.y = ws->current.y,
+			.width = ws->current.width,
+			.height = ws->current.height,
+		},
+		.children = ws->current.tiling,
+		.focused = focused,
+		.active_child = ws->current.focused_inactive_child,
+	};
+	render_containers(output, damage, &data);
 }
 
 static void render_floating_container(struct sway_output *soutput,
 		pixman_region32_t *damage, struct sway_container *con) {
-	if (con->type == C_VIEW) {
+	if (con->view) {
-		struct sway_view *view = con->sway_view;
+		struct sway_view *view = con->view;
 		struct border_colors *colors;
 		struct wlr_texture *title_texture;
 		struct wlr_texture *marks_texture;
@@ -777,10 +813,10 @@ static void render_floating_container(struct sway_output *soutput,
 			marks_texture = view->marks_unfocused;
 		}
 
-		if (!view->swayc->current.using_csd) {
+		if (!view->container->current.using_csd) {
 			if (con->current.border == B_NORMAL) {
-				render_titlebar(soutput, damage, con, con->current.swayc_x,
+				render_titlebar(soutput, damage, con, con->current.con_x,
-						con->current.swayc_y, con->current.swayc_width, colors,
+						con->current.con_y, con->current.con_width, colors,
 						title_texture, marks_texture);
 			} else if (con->current.border != B_NONE) {
 				render_top_border(soutput, damage, con, colors);
@@ -794,17 +830,15 @@ static void render_floating_container(struct sway_output *soutput,
 
 static void render_floating(struct sway_output *soutput,
 		pixman_region32_t *damage) {
-	for (int i = 0; i < root_container.current.children->length; ++i) {
+	for (int i = 0; i < root->outputs->length; ++i) {
-		struct sway_container *output =
+		struct sway_output *output = root->outputs->items[i];
-			root_container.current.children->items[i];
+		for (int j = 0; j < output->current.workspaces->length; ++j) {
-		for (int j = 0; j < output->current.children->length; ++j) {
+			struct sway_workspace *ws = output->current.workspaces->items[j];
-			struct sway_container *ws = output->current.children->items[j];
 			if (!workspace_is_visible(ws)) {
 				continue;
 			}
-			list_t *floating = ws->current.ws_floating;
+			for (int k = 0; k < ws->current.floating->length; ++k) {
-			for (int k = 0; k < floating->length; ++k) {
+				struct sway_container *floater = ws->current.floating->items[k];
-				struct sway_container *floater = floating->items[k];
 				render_floating_container(soutput, damage, floater);
 			}
 		}
@@ -837,8 +871,8 @@ void output_render(struct sway_output *output, struct timespec *when,
 		pixman_region32_union_rect(damage, damage, 0, 0, width, height);
 	}
 
-	struct sway_container *workspace = output_get_active_workspace(output);
+	struct sway_workspace *workspace = output_get_active_workspace(output);
-	struct sway_container *fullscreen_con = workspace->current.ws_fullscreen;
+	struct sway_container *fullscreen_con = workspace->current.fullscreen;
 
 	if (output_has_opaque_overlay_layer_surface(output)) {
 		goto render_overlay;
@@ -855,12 +889,11 @@ void output_render(struct sway_output *output, struct timespec *when,
 		}
 
 		// TODO: handle views smaller than the output
-		if (fullscreen_con->type == C_VIEW) {
+		if (fullscreen_con->view) {
-			if (fullscreen_con->sway_view->saved_buffer) {
+			if (fullscreen_con->view->saved_buffer) {
-				render_saved_view(fullscreen_con->sway_view,
+				render_saved_view(fullscreen_con->view, output, damage, 1.0f);
-						output, damage, 1.0f);
 			} else {
-				render_view_toplevels(fullscreen_con->sway_view,
+				render_view_toplevels(fullscreen_con->view,
 						output, damage, 1.0f);
 			}
 		} else {
@@ -868,8 +901,7 @@ void output_render(struct sway_output *output, struct timespec *when,
 					fullscreen_con->current.focused);
 		}
 #ifdef HAVE_XWAYLAND
-		render_unmanaged(output, damage,
+		render_unmanaged(output, damage, &root->xwayland_unmanaged);
-			&root_container.sway_root->xwayland_unmanaged);
 #endif
 	} else {
 		float clear_color[] = {0.25f, 0.25f, 0.25f, 1.0f};
@@ -886,31 +918,30 @@ void output_render(struct sway_output *output, struct timespec *when,
 		render_layer(output, damage,
 			&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM]);
 
-		render_container(output, damage, workspace, workspace->current.focused);
+		render_workspace(output, damage, workspace, workspace->current.focused);
 		render_floating(output, damage);
 #ifdef HAVE_XWAYLAND
-		render_unmanaged(output, damage,
+		render_unmanaged(output, damage, &root->xwayland_unmanaged);
-			&root_container.sway_root->xwayland_unmanaged);
 #endif
 		render_layer(output, damage,
 			&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP]);
 	}
 
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *focus = seat_get_focus(seat);
+	struct sway_container *focus = seat_get_focused_container(seat);
-	if (focus && focus->type == C_VIEW) {
+	if (focus && focus->view) {
-		render_view_popups(focus->sway_view, output, damage, focus->alpha);
+		render_view_popups(focus->view, output, damage, focus->alpha);
 	}
 
 render_overlay:
 	render_layer(output, damage,
 		&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY]);
-	render_drag_icons(output, damage, &root_container.sway_root->drag_icons);
+	render_drag_icons(output, damage, &root->drag_icons);
 
 renderer_end:
 	if (debug.render_tree) {
 		wlr_renderer_scissor(renderer, NULL);
-		wlr_render_texture(renderer, root_container.sway_root->debug_tree,
+		wlr_render_texture(renderer, root->debug_tree,
 			wlr_output->transform_matrix, 0, 40, 1);
 	}
 	if (debug.damage == DAMAGE_HIGHLIGHT) {

sway/desktop/transaction.c

@@ -12,6 +12,7 @@
 #include "sway/desktop/transaction.h"
 #include "sway/output.h"
 #include "sway/tree/container.h"
+#include "sway/tree/node.h"
 #include "sway/tree/view.h"
 #include "sway/tree/workspace.h"
 #include "list.h"
@@ -27,8 +28,12 @@ struct sway_transaction {
 
 struct sway_transaction_instruction {
 	struct sway_transaction *transaction;
-	struct sway_container *container;
+	struct sway_node *node;
-	struct sway_container_state state;
+	union {
+		struct sway_output_state *output_state;
+		struct sway_workspace_state *workspace_state;
+		struct sway_container_state *container_state;
+	};
 	uint32_t serial;
 };
 
@@ -47,26 +52,24 @@ static void transaction_destroy(struct sway_transaction *transaction) {
 	for (int i = 0; i < transaction->instructions->length; ++i) {
 		struct sway_transaction_instruction *instruction =
 			transaction->instructions->items[i];
-		struct sway_container *con = instruction->container;
+		struct sway_node *node = instruction->node;
-		con->ntxnrefs--;
+		node->ntxnrefs--;
-		if (con->instruction == instruction) {
+		if (node->instruction == instruction) {
-			con->instruction = NULL;
+			node->instruction = NULL;
 		}
-		if (con->destroying && con->ntxnrefs == 0) {
+		if (node->destroying && node->ntxnrefs == 0) {
-			switch (con->type) {
+			switch (node->type) {
-			case C_ROOT:
+			case N_ROOT:
+				sway_assert(false, "Never reached");
 				break;
-			case C_OUTPUT:
+			case N_OUTPUT:
-				output_destroy(con);
+				output_destroy(node->sway_output);
 				break;
-			case C_WORKSPACE:
+			case N_WORKSPACE:
-				workspace_destroy(con);
+				workspace_destroy(node->sway_workspace);
 				break;
-			case C_CONTAINER:
+			case N_CONTAINER:
-			case C_VIEW:
+				container_destroy(node->sway_container);
-				container_destroy(con);
-				break;
-			case C_TYPES:
 				break;
 			}
 		}
@@ -80,22 +83,79 @@ static void transaction_destroy(struct sway_transaction *transaction) {
 	free(transaction);
 }
 
-static void copy_pending_state(struct sway_container *container,
+static void copy_output_state(struct sway_output *output,
-		struct sway_container_state *state) {
+		struct sway_transaction_instruction *instruction) {
-	state->layout = container->layout;
+	struct sway_output_state *state =
-	state->swayc_x = container->x;
+		calloc(1, sizeof(struct sway_output_state));
-	state->swayc_y = container->y;
+	if (!state) {
-	state->swayc_width = container->width;
+		wlr_log(WLR_ERROR, "Could not allocate output state");
-	state->swayc_height = container->height;
+		return;
-	state->is_fullscreen = container->is_fullscreen;
+	}
-	state->has_gaps = container->has_gaps;
+	instruction->output_state = state;
-	state->current_gaps = container->current_gaps;
-	state->gaps_inner = container->gaps_inner;
-	state->gaps_outer = container->gaps_outer;
-	state->parent = container->parent;
 
-	if (container->type == C_VIEW) {
+	state->workspaces = create_list();
-		struct sway_view *view = container->sway_view;
+	list_cat(state->workspaces, output->workspaces);
+
+	state->active_workspace = output_get_active_workspace(output);
+}
+
+static void copy_workspace_state(struct sway_workspace *ws,
+		struct sway_transaction_instruction *instruction) {
+	struct sway_workspace_state *state =
+		calloc(1, sizeof(struct sway_workspace_state));
+	if (!state) {
+		wlr_log(WLR_ERROR, "Could not allocate workspace state");
+		return;
+	}
+	instruction->workspace_state = state;
+
+	state->fullscreen = ws->fullscreen;
+	state->x = ws->x;
+	state->y = ws->y;
+	state->width = ws->width;
+	state->height = ws->height;
+	state->layout = ws->layout;
+
+	state->output = ws->output;
+	state->floating = create_list();
+	state->tiling = create_list();
+	list_cat(state->floating, ws->floating);
+	list_cat(state->tiling, ws->tiling);
+
+	struct sway_seat *seat = input_manager_current_seat(input_manager);
+	state->focused = seat_get_focus(seat) == &ws->node;
+
+	// Set focused_inactive_child to the direct tiling child
+	struct sway_container *focus = seat_get_focus_inactive_tiling(seat, ws);
+	if (focus) {
+		while (focus->parent) {
+			focus = focus->parent;
+		}
+	}
+	state->focused_inactive_child = focus;
+}
+
+static void copy_container_state(struct sway_container *container,
+		struct sway_transaction_instruction *instruction) {
+	struct sway_container_state *state =
+		calloc(1, sizeof(struct sway_container_state));
+	if (!state) {
+		wlr_log(WLR_ERROR, "Could not allocate container state");
+		return;
+	}
+	instruction->container_state = state;
+
+	state->layout = container->layout;
+	state->con_x = container->x;
+	state->con_y = container->y;
+	state->con_width = container->width;
+	state->con_height = container->height;
+	state->is_fullscreen = container->is_fullscreen;
+	state->parent = container->parent;
+	state->workspace = container->workspace;
+
+	if (container->view) {
+		struct sway_view *view = container->view;
 		state->view_x = view->x;
 		state->view_y = view->y;
 		state->view_width = view->width;
@@ -107,50 +167,111 @@ static void copy_pending_state(struct sway_container *container,
 		state->border_right = view->border_right;
 		state->border_bottom = view->border_bottom;
 		state->using_csd = view->using_csd;
-	} else if (container->type == C_WORKSPACE) {
-		state->ws_fullscreen = container->sway_workspace->fullscreen;
-		state->ws_floating = create_list();
-		state->children = create_list();
-		list_cat(state->ws_floating, container->sway_workspace->floating);
-		list_cat(state->children, container->children);
 	} else {
 		state->children = create_list();
 		list_cat(state->children, container->children);
 	}
 
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	state->focused = seat_get_focus(seat) == container;
+	state->focused = seat_get_focus(seat) == &container->node;
 
-	if (container->type == C_WORKSPACE) {
+	if (!container->view) {
-		// Set focused_inactive_child to the direct tiling child
+		struct sway_node *focus = seat_get_active_child(seat, &container->node);
-		struct sway_container *focus =
+		state->focused_inactive_child = focus ? focus->sway_container : NULL;
-			seat_get_focus_inactive_tiling(seat, container);
-		if (focus && focus->type > C_WORKSPACE) {
-			while (focus->parent->type != C_WORKSPACE) {
-				focus = focus->parent;
-			}
-		}
-		state->focused_inactive_child = focus;
-	} else if (container->type != C_VIEW) {
-		state->focused_inactive_child =
-			seat_get_active_child(seat, container);
 	}
 }
 
-static void transaction_add_container(struct sway_transaction *transaction,
+static void transaction_add_node(struct sway_transaction *transaction,
-		struct sway_container *container) {
+		struct sway_node *node) {
 	struct sway_transaction_instruction *instruction =
 		calloc(1, sizeof(struct sway_transaction_instruction));
 	if (!sway_assert(instruction, "Unable to allocate instruction")) {
 		return;
 	}
 	instruction->transaction = transaction;
-	instruction->container = container;
+	instruction->node = node;
 
-	copy_pending_state(container, &instruction->state);
+	switch (node->type) {
+	case N_ROOT:
+		break;
+	case N_OUTPUT:
+		copy_output_state(node->sway_output, instruction);
+		break;
+	case N_WORKSPACE:
+		copy_workspace_state(node->sway_workspace, instruction);
+		break;
+	case N_CONTAINER:
+		copy_container_state(node->sway_container, instruction);
+		break;
+	}
 
 	list_add(transaction->instructions, instruction);
-	container->ntxnrefs++;
+	node->ntxnrefs++;
+}
+
+static void apply_output_state(struct sway_output *output,
+		struct sway_output_state *state) {
+	output_damage_whole(output);
+	list_free(output->current.workspaces);
+	memcpy(&output->current, state, sizeof(struct sway_output_state));
+	output_damage_whole(output);
+}
+
+static void apply_workspace_state(struct sway_workspace *ws,
+		struct sway_workspace_state *state) {
+	output_damage_whole(ws->current.output);
+	list_free(ws->current.floating);
+	list_free(ws->current.tiling);
+	memcpy(&ws->current, state, sizeof(struct sway_workspace_state));
+	output_damage_whole(ws->current.output);
+}
+
+static void apply_container_state(struct sway_container *container,
+		struct sway_container_state *state) {
+	struct sway_view *view = container->view;
+	// Damage the old location
+	desktop_damage_whole_container(container);
+	if (view && view->saved_buffer) {
+		struct wlr_box box = {
+			.x = container->current.view_x - view->saved_geometry.x,
+			.y = container->current.view_y - view->saved_geometry.y,
+			.width = view->saved_buffer_width,
+			.height = view->saved_buffer_height,
+		};
+		desktop_damage_box(&box);
+	}
+
+	// There are separate children lists for each instruction state, the
+	// container's current state and the container's pending state
+	// (ie. con->children). The list itself needs to be freed here.
+	// Any child containers which are being deleted will be cleaned up in
+	// transaction_destroy().
+	list_free(container->current.children);
+
+	memcpy(&container->current, state, sizeof(struct sway_container_state));
+
+	if (view && view->saved_buffer) {
+		if (!container->node.destroying || container->node.ntxnrefs == 1) {
+			view_remove_saved_buffer(view);
+		}
+	}
+
+	// Damage the new location
+	desktop_damage_whole_container(container);
+	if (view && view->surface) {
+		struct wlr_surface *surface = view->surface;
+		struct wlr_box box = {
+			.x = container->current.view_x - view->geometry.x,
+			.y = container->current.view_y - view->geometry.y,
+			.width = surface->current.width,
+			.height = surface->current.height,
+		};
+		desktop_damage_box(&box);
+	}
+
+	if (!container->node.destroying) {
+		container_discover_outputs(container);
+	}
 }
 
 /**
@@ -168,67 +289,36 @@ static void transaction_apply(struct sway_transaction *transaction) {
 				"(%.1f frames if 60Hz)", transaction, ms, ms / (1000.0f / 60));
 	}
 
-	// Apply the instruction state to the container's current state
+	// Apply the instruction state to the node's current state
 	for (int i = 0; i < transaction->instructions->length; ++i) {
 		struct sway_transaction_instruction *instruction =
 			transaction->instructions->items[i];
-		struct sway_container *container = instruction->container;
+		struct sway_node *node = instruction->node;
 
-		// Damage the old location
+		switch (node->type) {
-		desktop_damage_whole_container(container);
+		case N_ROOT:
-		if (container->type == C_VIEW && container->sway_view->saved_buffer) {
+			break;
-			struct sway_view *view = container->sway_view;
+		case N_OUTPUT:
-			struct wlr_box box = {
+			apply_output_state(node->sway_output, instruction->output_state);
-				.x = container->current.view_x - view->saved_geometry.x,
+			break;
-				.y = container->current.view_y - view->saved_geometry.y,
+		case N_WORKSPACE:
-				.width = view->saved_buffer_width,
+			apply_workspace_state(node->sway_workspace,
-				.height = view->saved_buffer_height,
+					instruction->workspace_state);
-			};
+			break;
-			desktop_damage_box(&box);
+		case N_CONTAINER:
+			apply_container_state(node->sway_container,
+					instruction->container_state);
+			break;
 		}
 
-		// There are separate children lists for each instruction state, the
+		node->instruction = NULL;
-		// container's current state and the container's pending state
-		// (ie. con->children). The list itself needs to be freed here.
-		// Any child containers which are being deleted will be cleaned up in
-		// transaction_destroy().
-		list_free(container->current.children);
-		list_free(container->current.ws_floating);
-
-		memcpy(&container->current, &instruction->state,
-				sizeof(struct sway_container_state));
-
-		if (container->type == C_VIEW && container->sway_view->saved_buffer) {
-			if (!container->destroying || container->ntxnrefs == 1) {
-				view_remove_saved_buffer(container->sway_view);
-			}
-		}
-
-		// Damage the new location
-		desktop_damage_whole_container(container);
-		if (container->type == C_VIEW && container->sway_view->surface) {
-			struct sway_view *view = container->sway_view;
-			struct wlr_surface *surface = view->surface;
-			struct wlr_box box = {
-				.x = container->current.view_x - view->geometry.x,
-				.y = container->current.view_y - view->geometry.y,
-				.width = surface->current.width,
-				.height = surface->current.height,
-			};
-			desktop_damage_box(&box);
-		}
-
-		container->instruction = NULL;
-		if (container->type == C_CONTAINER || container->type == C_VIEW) {
-			container_discover_outputs(container);
-		}
 	}
 }
 
 static void transaction_commit(struct sway_transaction *transaction);
 
-// Return true if both transactions operate on the same containers
+// Return true if both transactions operate on the same nodes
-static bool transaction_same_containers(struct sway_transaction *a,
+static bool transaction_same_nodes(struct sway_transaction *a,
 		struct sway_transaction *b) {
 	if (a->instructions->length != b->instructions->length) {
 		return false;
@@ -236,7 +326,7 @@ static bool transaction_same_containers(struct sway_transaction *a,
 	for (int i = 0; i < a->instructions->length; ++i) {
 		struct sway_transaction_instruction *a_inst = a->instructions->items[i];
 		struct sway_transaction_instruction *b_inst = b->instructions->items[i];
-		if (a_inst->container != b_inst->container) {
+		if (a_inst->node != b_inst->node) {
 			return false;
 		}
 	}
@@ -267,7 +357,7 @@ static void transaction_progress_queue() {
 	while (server.transactions->length >= 2) {
 		struct sway_transaction *a = server.transactions->items[0];
 		struct sway_transaction *b = server.transactions->items[1];
-		if (transaction_same_containers(a, b)) {
+		if (transaction_same_nodes(a, b)) {
 			list_del(server.transactions, 0);
 			transaction_destroy(a);
 		} else {
@@ -289,16 +379,18 @@ static int handle_timeout(void *data) {
 	return 0;
 }
 
-static bool should_configure(struct sway_container *con,
+static bool should_configure(struct sway_node *node,
 		struct sway_transaction_instruction *instruction) {
-	if (con->type != C_VIEW) {
+	if (!node_is_view(node)) {
 		return false;
 	}
-	if (con->destroying) {
+	if (node->destroying) {
 		return false;
 	}
-	if (con->current.view_width == instruction->state.view_width &&
+	struct sway_container_state *cstate = &node->sway_container->current;
-			con->current.view_height == instruction->state.view_height) {
+	struct sway_container_state *istate = instruction->container_state;
+	if (cstate->view_width == istate->view_width &&
+			cstate->view_height == istate->view_height) {
 		return false;
 	}
 	return true;
@@ -311,13 +403,13 @@ static void transaction_commit(struct sway_transaction *transaction) {
 	for (int i = 0; i < transaction->instructions->length; ++i) {
 		struct sway_transaction_instruction *instruction =
 			transaction->instructions->items[i];
-		struct sway_container *con = instruction->container;
+		struct sway_node *node = instruction->node;
-		if (should_configure(con, instruction)) {
+		if (should_configure(node, instruction)) {
-			instruction->serial = view_configure(con->sway_view,
+			instruction->serial = view_configure(node->sway_container->view,
-					instruction->state.view_x,
+					instruction->container_state->view_x,
-					instruction->state.view_y,
+					instruction->container_state->view_y,
-					instruction->state.view_width,
+					instruction->container_state->view_width,
-					instruction->state.view_height);
+					instruction->container_state->view_height);
 			++transaction->num_waiting;
 
 			// From here on we are rendering a saved buffer of the view, which
@@ -325,14 +417,16 @@ static void transaction_commit(struct sway_transaction *transaction) {
 			// as soon as possible. Additionally, this is required if a view is
 			// mapping and its default geometry doesn't intersect an output.
 			struct timespec when;
-			wlr_surface_send_frame_done(con->sway_view->surface, &when);
+			wlr_surface_send_frame_done(
+					node->sway_container->view->surface, &when);
 		}
-		if (con->type == C_VIEW && !con->sway_view->saved_buffer) {
+		if (node_is_view(node) && !node->sway_container->view->saved_buffer) {
-			view_save_buffer(con->sway_view);
+			view_save_buffer(node->sway_container->view);
-			memcpy(&con->sway_view->saved_geometry, &con->sway_view->geometry,
+			memcpy(&node->sway_container->view->saved_geometry,
+					&node->sway_container->view->geometry,
 					sizeof(struct wlr_box));
 		}
-		con->instruction = instruction;
+		node->instruction = instruction;
 	}
 	transaction->num_configures = transaction->num_waiting;
 	if (debug.txn_timings) {
@@ -381,7 +475,7 @@ static void set_instruction_ready(
 				transaction,
 				transaction->num_configures - transaction->num_waiting + 1,
 				transaction->num_configures, ms,
-				instruction->container->name);
+				instruction->node->sway_container->title);
 	}
 
 	// If the transaction has timed out then its num_waiting will be 0 already.
@@ -390,41 +484,43 @@ static void set_instruction_ready(
 		wl_event_source_timer_update(transaction->timer, 0);
 	}
 
-	instruction->container->instruction = NULL;
+	instruction->node->instruction = NULL;
 	transaction_progress_queue();
 }
 
 void transaction_notify_view_ready_by_serial(struct sway_view *view,
 		uint32_t serial) {
-	struct sway_transaction_instruction *instruction = view->swayc->instruction;
+	struct sway_transaction_instruction *instruction =
-	if (view->swayc->instruction->serial == serial) {
+		view->container->node.instruction;
+	if (instruction->serial == serial) {
 		set_instruction_ready(instruction);
 	}
 }
 
 void transaction_notify_view_ready_by_size(struct sway_view *view,
 		int width, int height) {
-	struct sway_transaction_instruction *instruction = view->swayc->instruction;
+	struct sway_transaction_instruction *instruction =
-	if (instruction->state.view_width == width &&
+		view->container->node.instruction;
-			instruction->state.view_height == height) {
+	if (instruction->container_state->view_width == width &&
+			instruction->container_state->view_height == height) {
 		set_instruction_ready(instruction);
 	}
 }
 
 void transaction_commit_dirty(void) {
-	if (!server.dirty_containers->length) {
+	if (!server.dirty_nodes->length) {
 		return;
 	}
 	struct sway_transaction *transaction = transaction_create();
 	if (!transaction) {
 		return;
 	}
-	for (int i = 0; i < server.dirty_containers->length; ++i) {
+	for (int i = 0; i < server.dirty_nodes->length; ++i) {
-		struct sway_container *container = server.dirty_containers->items[i];
+		struct sway_node *node = server.dirty_nodes->items[i];
-		transaction_add_container(transaction, container);
+		transaction_add_node(transaction, node);
-		container->dirty = false;
+		node->dirty = false;
 	}
-	server.dirty_containers->length = 0;
+	server.dirty_nodes->length = 0;
 
 	list_add(server.transactions, transaction);
 

sway/desktop/xdg_shell.c

@@ -11,10 +11,12 @@
 #include "sway/desktop/transaction.h"
 #include "sway/input/input-manager.h"
 #include "sway/input/seat.h"
+#include "sway/output.h"
 #include "sway/server.h"
 #include "sway/tree/arrange.h"
 #include "sway/tree/container.h"
 #include "sway/tree/view.h"
+#include "sway/tree/workspace.h"
 
 static const struct sway_view_child_impl popup_impl;
 
@@ -52,13 +54,13 @@ static void popup_unconstrain(struct sway_xdg_popup *popup) {
 	struct sway_view *view = popup->child.view;
 	struct wlr_xdg_popup *wlr_popup = popup->wlr_xdg_surface->popup;
 
-	struct sway_container *output = container_parent(view->swayc, C_OUTPUT);
+	struct sway_output *output = view->container->workspace->output;
 
 	// the output box expressed in the coordinate system of the toplevel parent
 	// of the popup
 	struct wlr_box output_toplevel_sx_box = {
-		.x = output->x - view->x,
+		.x = output->lx - view->x,
-		.y = output->y - view->y,
+		.y = output->ly - view->y,
 		.width = output->width,
 		.height = output->height,
 	};
@@ -252,11 +254,7 @@ static void handle_commit(struct wl_listener *listener, void *data) {
 	struct sway_view *view = &xdg_shell_view->view;
 	struct wlr_xdg_surface *xdg_surface = view->wlr_xdg_surface;
 
-	if (!view->swayc) {
+	if (view->container->node.instruction) {
-		return;
-	}
-
-	if (view->swayc->instruction) {
 		wlr_xdg_surface_get_geometry(xdg_surface, &view->geometry);
 		transaction_notify_view_ready_by_serial(view,
 				xdg_surface->configure_serial);
@@ -265,7 +263,7 @@ static void handle_commit(struct wl_listener *listener, void *data) {
 		wlr_xdg_surface_get_geometry(xdg_surface, &new_geo);
 
 		if ((new_geo.width != view->width || new_geo.height != view->height) &&
-				container_is_floating(view->swayc)) {
+				container_is_floating(view->container)) {
 			// A floating view has unexpectedly sent a new size
 			desktop_damage_view(view);
 			view_update_size(view, new_geo.width, new_geo.height);
@@ -319,10 +317,9 @@ static void handle_request_fullscreen(struct wl_listener *listener, void *data)
 		return;
 	}
 
-	container_set_fullscreen(view->swayc, e->fullscreen);
+	container_set_fullscreen(view->container, e->fullscreen);
 
-	struct sway_container *output = container_parent(view->swayc, C_OUTPUT);
+	arrange_workspace(view->container->workspace);
-	arrange_windows(output);
 	transaction_commit_dirty();
 }
 
@@ -330,13 +327,13 @@ static void handle_request_move(struct wl_listener *listener, void *data) {
 	struct sway_xdg_shell_view *xdg_shell_view =
 		wl_container_of(listener, xdg_shell_view, request_move);
 	struct sway_view *view = &xdg_shell_view->view;
-	if (!container_is_floating(view->swayc)) {
+	if (!container_is_floating(view->container)) {
 		return;
 	}
 	struct wlr_xdg_toplevel_move_event *e = data;
 	struct sway_seat *seat = e->seat->seat->data;
 	if (e->serial == seat->last_button_serial) {
-		seat_begin_move(seat, view->swayc, seat->last_button);
+		seat_begin_move(seat, view->container, seat->last_button);
 	}
 }
 
@@ -344,13 +341,13 @@ static void handle_request_resize(struct wl_listener *listener, void *data) {
 	struct sway_xdg_shell_view *xdg_shell_view =
 		wl_container_of(listener, xdg_shell_view, request_resize);
 	struct sway_view *view = &xdg_shell_view->view;
-	if (!container_is_floating(view->swayc)) {
+	if (!container_is_floating(view->container)) {
 		return;
 	}
 	struct wlr_xdg_toplevel_resize_event *e = data;
 	struct sway_seat *seat = e->seat->seat->data;
 	if (e->serial == seat->last_button_serial) {
-		seat_begin_resize_floating(seat, view->swayc,
+		seat_begin_resize_floating(seat, view->container,
 				seat->last_button, e->edges);
 	}
 }
@@ -399,11 +396,14 @@ static void handle_map(struct wl_listener *listener, void *data) {
 	view_map(view, view->wlr_xdg_surface->surface);
 
 	if (xdg_surface->toplevel->client_pending.fullscreen) {
-		container_set_fullscreen(view->swayc, true);
+		container_set_fullscreen(view->container, true);
-		struct sway_container *ws = container_parent(view->swayc, C_WORKSPACE);
+		arrange_workspace(view->container->workspace);
-		arrange_windows(ws);
 	} else {
-		arrange_windows(view->swayc->parent);
+		if (view->container->parent) {
+			arrange_container(view->container->parent);
+		} else {
+			arrange_workspace(view->container->workspace);
+		}
 	}
 	transaction_commit_dirty();
 
@@ -440,8 +440,7 @@ static void handle_destroy(struct wl_listener *listener, void *data) {
 	struct sway_xdg_shell_view *xdg_shell_view =
 		wl_container_of(listener, xdg_shell_view, destroy);
 	struct sway_view *view = &xdg_shell_view->view;
-	if (!sway_assert(view->swayc == NULL || view->swayc->destroying,
+	if (!sway_assert(view->surface == NULL, "Tried to destroy a mapped view")) {
-				"Tried to destroy a mapped view")) {
 		return;
 	}
 	wl_list_remove(&xdg_shell_view->destroy.link);

sway/desktop/xdg_shell_v6.c

@@ -10,10 +10,12 @@
 #include "sway/desktop/transaction.h"
 #include "sway/input/input-manager.h"
 #include "sway/input/seat.h"
+#include "sway/output.h"
 #include "sway/server.h"
 #include "sway/tree/arrange.h"
 #include "sway/tree/container.h"
 #include "sway/tree/view.h"
+#include "sway/tree/workspace.h"
 
 static const struct sway_view_child_impl popup_impl;
 
@@ -51,13 +53,13 @@ static void popup_unconstrain(struct sway_xdg_popup_v6 *popup) {
 	struct sway_view *view = popup->child.view;
 	struct wlr_xdg_popup_v6 *wlr_popup = popup->wlr_xdg_surface_v6->popup;
 
-	struct sway_container *output = container_parent(view->swayc, C_OUTPUT);
+	struct sway_output *output = view->container->workspace->output;
 
 	// the output box expressed in the coordinate system of the toplevel parent
 	// of the popup
 	struct wlr_box output_toplevel_sx_box = {
-		.x = output->x - view->x,
+		.x = output->lx - view->x,
-		.y = output->y - view->y,
+		.y = output->ly - view->y,
 		.width = output->width,
 		.height = output->height,
 	};
@@ -249,11 +251,7 @@ static void handle_commit(struct wl_listener *listener, void *data) {
 	struct sway_view *view = &xdg_shell_v6_view->view;
 	struct wlr_xdg_surface_v6 *xdg_surface_v6 = view->wlr_xdg_surface_v6;
 
-	if (!view->swayc) {
+	if (view->container->node.instruction) {
-		return;
-	}
-
-	if (view->swayc->instruction) {
 		wlr_xdg_surface_v6_get_geometry(xdg_surface_v6, &view->geometry);
 		transaction_notify_view_ready_by_serial(view,
 				xdg_surface_v6->configure_serial);
@@ -262,7 +260,7 @@ static void handle_commit(struct wl_listener *listener, void *data) {
 		wlr_xdg_surface_v6_get_geometry(xdg_surface_v6, &new_geo);
 
 		if ((new_geo.width != view->width || new_geo.height != view->height) &&
-				container_is_floating(view->swayc)) {
+				container_is_floating(view->container)) {
 			// A floating view has unexpectedly sent a new size
 			desktop_damage_view(view);
 			view_update_size(view, new_geo.width, new_geo.height);
@@ -316,10 +314,9 @@ static void handle_request_fullscreen(struct wl_listener *listener, void *data)
 		return;
 	}
 
-	container_set_fullscreen(view->swayc, e->fullscreen);
+	container_set_fullscreen(view->container, e->fullscreen);
 
-	struct sway_container *output = container_parent(view->swayc, C_OUTPUT);
+	arrange_workspace(view->container->workspace);
-	arrange_windows(output);
 	transaction_commit_dirty();
 }
 
@@ -327,13 +324,13 @@ static void handle_request_move(struct wl_listener *listener, void *data) {
 	struct sway_xdg_shell_v6_view *xdg_shell_v6_view =
 		wl_container_of(listener, xdg_shell_v6_view, request_move);
 	struct sway_view *view = &xdg_shell_v6_view->view;
-	if (!container_is_floating(view->swayc)) {
+	if (!container_is_floating(view->container)) {
 		return;
 	}
 	struct wlr_xdg_toplevel_v6_move_event *e = data;
 	struct sway_seat *seat = e->seat->seat->data;
 	if (e->serial == seat->last_button_serial) {
-		seat_begin_move(seat, view->swayc, seat->last_button);
+		seat_begin_move(seat, view->container, seat->last_button);
 	}
 }
 
@@ -341,13 +338,13 @@ static void handle_request_resize(struct wl_listener *listener, void *data) {
 	struct sway_xdg_shell_v6_view *xdg_shell_v6_view =
 		wl_container_of(listener, xdg_shell_v6_view, request_resize);
 	struct sway_view *view = &xdg_shell_v6_view->view;
-	if (!container_is_floating(view->swayc)) {
+	if (!container_is_floating(view->container)) {
 		return;
 	}
 	struct wlr_xdg_toplevel_v6_resize_event *e = data;
 	struct sway_seat *seat = e->seat->seat->data;
 	if (e->serial == seat->last_button_serial) {
-		seat_begin_resize_floating(seat, view->swayc,
+		seat_begin_resize_floating(seat, view->container,
 				seat->last_button, e->edges);
 	}
 }
@@ -396,11 +393,14 @@ static void handle_map(struct wl_listener *listener, void *data) {
 	view_map(view, view->wlr_xdg_surface_v6->surface);
 
 	if (xdg_surface->toplevel->client_pending.fullscreen) {
-		container_set_fullscreen(view->swayc, true);
+		container_set_fullscreen(view->container, true);
-		struct sway_container *ws = container_parent(view->swayc, C_WORKSPACE);
+		arrange_workspace(view->container->workspace);
-		arrange_windows(ws);
 	} else {
-		arrange_windows(view->swayc->parent);
+		if (view->container->parent) {
+			arrange_container(view->container->parent);
+		} else {
+			arrange_workspace(view->container->workspace);
+		}
 	}
 	transaction_commit_dirty();
 

sway/desktop/xwayland.c

@@ -59,8 +59,7 @@ static void unmanaged_handle_map(struct wl_listener *listener, void *data) {
 		wl_container_of(listener, surface, map);
 	struct wlr_xwayland_surface *xsurface = surface->wlr_xwayland_surface;
 
-	wl_list_insert(root_container.sway_root->xwayland_unmanaged.prev,
+	wl_list_insert(root->xwayland_unmanaged.prev, &surface->link);
-		&surface->link);
 
 	wl_signal_add(&xsurface->surface->events.commit, &surface->commit);
 	surface->commit.notify = unmanaged_handle_commit;
@@ -90,11 +89,10 @@ static void unmanaged_handle_unmap(struct wl_listener *listener, void *data) {
 	if (seat->wlr_seat->keyboard_state.focused_surface ==
 			xsurface->surface) {
 		// Restore focus
-		struct sway_container *previous =
+		struct sway_node *previous = seat_get_focus_inactive(seat, &root->node);
-			seat_get_focus_inactive(seat, &root_container);
 		if (previous) {
 			// Hack to get seat to re-focus the return value of get_focus
-			seat_set_focus(seat, previous->parent);
+			seat_set_focus(seat, NULL);
 			seat_set_focus(seat, previous);
 		}
 	}
@@ -299,7 +297,7 @@ static void handle_commit(struct wl_listener *listener, void *data) {
 	struct wlr_xwayland_surface *xsurface = view->wlr_xwayland_surface;
 	struct wlr_surface_state *state = &xsurface->surface->current;
 
-	if (view->swayc->instruction) {
+	if (view->container->node.instruction) {
 		get_geometry(view, &view->geometry);
 		transaction_notify_view_ready_by_size(view,
 				state->width, state->height);
@@ -308,7 +306,7 @@ static void handle_commit(struct wl_listener *listener, void *data) {
 		get_geometry(view, &new_geo);
 
 		if ((new_geo.width != view->width || new_geo.height != view->height) &&
-				container_is_floating(view->swayc)) {
+				container_is_floating(view->container)) {
 			// A floating view has unexpectedly sent a new size
 			// eg. The Firefox "Save As" dialog when downloading a file
 			desktop_damage_view(view);
@@ -391,11 +389,14 @@ static void handle_map(struct wl_listener *listener, void *data) {
 	view_map(view, xsurface->surface);
 
 	if (xsurface->fullscreen) {
-		container_set_fullscreen(view->swayc, true);
+		container_set_fullscreen(view->container, true);
-		struct sway_container *ws = container_parent(view->swayc, C_WORKSPACE);
+		arrange_workspace(view->container->workspace);
-		arrange_windows(ws);
 	} else {
-		arrange_windows(view->swayc->parent);
+		if (view->container->parent) {
+			arrange_container(view->container->parent);
+		} else {
+			arrange_workspace(view->container->workspace);
+		}
 	}
 	transaction_commit_dirty();
 }
@@ -411,13 +412,14 @@ static void handle_request_configure(struct wl_listener *listener, void *data) {
 			ev->width, ev->height);
 		return;
 	}
-	if (container_is_floating(view->swayc)) {
+	if (container_is_floating(view->container)) {
-		configure(view, view->swayc->current.view_x,
+		configure(view, view->container->current.view_x,
-				view->swayc->current.view_y, ev->width, ev->height);
+				view->container->current.view_y, ev->width, ev->height);
 	} else {
-		configure(view, view->swayc->current.view_x,
+		configure(view, view->container->current.view_x,
-				view->swayc->current.view_y, view->swayc->current.view_width,
+				view->container->current.view_y,
-				view->swayc->current.view_height);
+				view->container->current.view_width,
+				view->container->current.view_height);
 	}
 }
 
@@ -429,10 +431,9 @@ static void handle_request_fullscreen(struct wl_listener *listener, void *data)
 	if (!xsurface->mapped) {
 		return;
 	}
-	container_set_fullscreen(view->swayc, xsurface->fullscreen);
+	container_set_fullscreen(view->container, xsurface->fullscreen);
 
-	struct sway_container *output = container_parent(view->swayc, C_OUTPUT);
+	arrange_workspace(view->container->workspace);
-	arrange_windows(output);
 	transaction_commit_dirty();
 }
 
@@ -444,11 +445,11 @@ static void handle_request_move(struct wl_listener *listener, void *data) {
 	if (!xsurface->mapped) {
 		return;
 	}
-	if (!container_is_floating(view->swayc)) {
+	if (!container_is_floating(view->container)) {
 		return;
 	}
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	seat_begin_move(seat, view->swayc, seat->last_button);
+	seat_begin_move(seat, view->container, seat->last_button);
 }
 
 static void handle_request_resize(struct wl_listener *listener, void *data) {
@@ -459,12 +460,13 @@ static void handle_request_resize(struct wl_listener *listener, void *data) {
 	if (!xsurface->mapped) {
 		return;
 	}
-	if (!container_is_floating(view->swayc)) {
+	if (!container_is_floating(view->container)) {
 		return;
 	}
 	struct wlr_xwayland_resize_event *e = data;
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	seat_begin_resize_floating(seat, view->swayc, seat->last_button, e->edges);
+	seat_begin_resize_floating(seat, view->container,
+			seat->last_button, e->edges);
 }
 
 static void handle_request_activate(struct wl_listener *listener, void *data) {

sway/input/cursor.c

@@ -20,6 +20,7 @@
 #include "sway/layers.h"
 #include "sway/output.h"
 #include "sway/tree/arrange.h"
+#include "sway/tree/container.h"
 #include "sway/tree/root.h"
 #include "sway/tree/view.h"
 #include "sway/tree/workspace.h"
@@ -50,15 +51,15 @@ static struct wlr_surface *layer_surface_at(struct sway_output *output,
 }
 
 /**
- * Returns the container at the cursor's position. If there is a surface at that
+ * Returns the node at the cursor's position. If there is a surface at that
  * location, it is stored in **surface (it may not be a view).
  */
-static struct sway_container *container_at_coords(
+static struct sway_node *node_at_coords(
 		struct sway_seat *seat, double lx, double ly,
 		struct wlr_surface **surface, double *sx, double *sy) {
 	// check for unmanaged views first
 #ifdef HAVE_XWAYLAND
-	struct wl_list *unmanaged = &root_container.sway_root->xwayland_unmanaged;
+	struct wl_list *unmanaged = &root->xwayland_unmanaged;
 	struct sway_xwayland_unmanaged *unmanaged_surface;
 	wl_list_for_each_reverse(unmanaged_surface, unmanaged, link) {
 		struct wlr_xwayland_surface *xsurface =
@@ -75,67 +76,54 @@ static struct sway_container *container_at_coords(
 	}
 #endif
 	// find the output the cursor is on
-	struct wlr_output_layout *output_layout =
-		root_container.sway_root->output_layout;
 	struct wlr_output *wlr_output = wlr_output_layout_output_at(
-			output_layout, lx, ly);
+			root->output_layout, lx, ly);
 	if (wlr_output == NULL) {
 		return NULL;
 	}
 	struct sway_output *output = wlr_output->data;
 	double ox = lx, oy = ly;
-	wlr_output_layout_output_coords(output_layout, wlr_output, &ox, &oy);
+	wlr_output_layout_output_coords(root->output_layout, wlr_output, &ox, &oy);
 
 	// find the focused workspace on the output for this seat
-	struct sway_container *ws = seat_get_focus_inactive(seat, output->swayc);
+	struct sway_workspace *ws = output_get_active_workspace(output);
-	if (ws && ws->type != C_WORKSPACE) {
-		ws = container_parent(ws, C_WORKSPACE);
-	}
-	if (!ws) {
-		return output->swayc;
-	}
 
 	if ((*surface = layer_surface_at(output,
 				&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY],
 				ox, oy, sx, sy))) {
-		return ws;
+		return NULL;
 	}
-	if (ws->sway_workspace->fullscreen) {
+	if (ws->fullscreen) {
-		return tiling_container_at(ws->sway_workspace->fullscreen, lx, ly,
+		struct sway_container *con =
-				surface, sx, sy);
+			tiling_container_at(&ws->fullscreen->node, lx, ly, surface, sx, sy);
+		if (con) {
+			return &con->node;
+		}
+		return NULL;
 	}
 	if ((*surface = layer_surface_at(output,
 				&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP],
 				ox, oy, sx, sy))) {
-		return ws;
+		return NULL;
 	}
 
 	struct sway_container *c;
 	if ((c = container_at(ws, lx, ly, surface, sx, sy))) {
-		return c;
+		return &c->node;
 	}
 
 	if ((*surface = layer_surface_at(output,
 				&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM],
 				ox, oy, sx, sy))) {
-		return ws;
+		return NULL;
 	}
 	if ((*surface = layer_surface_at(output,
 				&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND],
 				ox, oy, sx, sy))) {
-		return ws;
+		return NULL;
 	}
 
-	c = seat_get_active_child(seat, output->swayc);
+	return &ws->node;
-	if (c) {
-		return c;
-	}
-	if (!c && output->swayc->children->length) {
-		c = output->swayc->children->items[0];
-		return c;
-	}
-
-	return output->swayc;
 }
 
 /**
@@ -160,13 +148,14 @@ static bool edge_is_external(struct sway_container *cont, enum wlr_edges edge) {
 
 	// Iterate the parents until we find one with the layout we want,
 	// then check if the child has siblings between it and the edge.
-	while (cont->type != C_OUTPUT) {
+	while (cont) {
-		if (cont->parent->layout == layout) {
+		if (container_parent_layout(cont) == layout) {
-			int index = list_find(cont->parent->children, cont);
+			list_t *siblings = container_get_siblings(cont);
+			int index = list_find(siblings, cont);
 			if (index > 0 && (edge == WLR_EDGE_LEFT || edge == WLR_EDGE_TOP)) {
 				return false;
 			}
-			if (index < cont->parent->children->length - 1 &&
+			if (index < siblings->length - 1 &&
 					(edge == WLR_EDGE_RIGHT || edge == WLR_EDGE_BOTTOM)) {
 				return false;
 			}
@@ -178,10 +167,10 @@ static bool edge_is_external(struct sway_container *cont, enum wlr_edges edge) {
 
 static enum wlr_edges find_edge(struct sway_container *cont,
 		struct sway_cursor *cursor) {
-	if (cont->type != C_VIEW) {
+	if (!cont->view) {
 		return WLR_EDGE_NONE;
 	}
-	struct sway_view *view = cont->sway_view;
+	struct sway_view *view = cont->view;
 	if (view->border == B_NONE || !view->border_thickness || view->using_csd) {
 		return WLR_EDGE_NONE;
 	}
@@ -219,7 +208,7 @@ static enum wlr_edges find_resize_edge(struct sway_container *cont,
 static void handle_down_motion(struct sway_seat *seat,
 		struct sway_cursor *cursor, uint32_t time_msec) {
 	struct sway_container *con = seat->op_container;
-	if (seat_is_input_allowed(seat, con->sway_view->surface)) {
+	if (seat_is_input_allowed(seat, con->view->surface)) {
 		double moved_x = cursor->cursor->x - seat->op_ref_lx;
 		double moved_y = cursor->cursor->y - seat->op_ref_ly;
 		double sx = seat->op_ref_con_lx + moved_x;
@@ -260,8 +249,7 @@ static void calculate_floating_constraints(struct sway_container *con,
 	if (config->floating_maximum_width == -1) { // no maximum
 		*max_width = INT_MAX;
 	} else if (config->floating_maximum_width == 0) { // automatic
-		struct sway_container *ws = container_parent(con, C_WORKSPACE);
+		*max_width = con->workspace->width;
-		*max_width = ws->width;
 	} else {
 		*max_width = config->floating_maximum_width;
 	}
@@ -269,8 +257,7 @@ static void calculate_floating_constraints(struct sway_container *con,
 	if (config->floating_maximum_height == -1) { // no maximum
 		*max_height = INT_MAX;
 	} else if (config->floating_maximum_height == 0) { // automatic
-		struct sway_container *ws = container_parent(con, C_WORKSPACE);
+		*max_height = con->workspace->height;
-		*max_height = ws->height;
 	} else {
 		*max_height = config->floating_maximum_height;
 	}
@@ -314,9 +301,9 @@ static void handle_resize_floating_motion(struct sway_seat *seat,
 	height = fmax(min_height, fmin(height, max_height));
 
 	// Apply the view's min/max size
-	if (con->type == C_VIEW) {
+	if (con->view) {
 		double view_min_width, view_max_width, view_min_height, view_max_height;
-		view_get_constraints(con->sway_view, &view_min_width, &view_max_width,
+		view_get_constraints(con->view, &view_min_width, &view_max_width,
 				&view_min_height, &view_max_height);
 		width = fmax(view_min_width, fmin(width, view_max_width));
 		height = fmax(view_min_height, fmin(height, view_max_height));
@@ -357,15 +344,15 @@ static void handle_resize_floating_motion(struct sway_seat *seat,
 	con->width += relative_grow_width;
 	con->height += relative_grow_height;
 
-	if (con->type == C_VIEW) {
+	if (con->view) {
-		struct sway_view *view = con->sway_view;
+		struct sway_view *view = con->view;
 		view->x += relative_grow_x;
 		view->y += relative_grow_y;
 		view->width += relative_grow_width;
 		view->height += relative_grow_height;
 	}
 
-	arrange_windows(con);
+	arrange_container(con);
 }
 
 static void handle_resize_tiling_motion(struct sway_seat *seat,
@@ -435,44 +422,40 @@ void cursor_send_pointer_motion(struct sway_cursor *cursor, uint32_t time_msec,
 	struct wlr_surface *surface = NULL;
 	double sx, sy;
 
-	// Find the container beneath the pointer's previous position
+	// Find the node beneath the pointer's previous position
-	struct sway_container *prev_c = container_at_coords(seat,
+	struct sway_node *prev_node = node_at_coords(seat,
 			cursor->previous.x, cursor->previous.y, &surface, &sx, &sy);
 	// Update the stored previous position
 	cursor->previous.x = cursor->cursor->x;
 	cursor->previous.y = cursor->cursor->y;
 
-	struct sway_container *c = container_at_coords(seat,
+	struct sway_node *node = node_at_coords(seat,
 			cursor->cursor->x, cursor->cursor->y, &surface, &sx, &sy);
-	if (c && config->focus_follows_mouse && allow_refocusing) {
+	if (node && config->focus_follows_mouse && allow_refocusing) {
-		struct sway_container *focus = seat_get_focus(seat);
+		struct sway_node *focus = seat_get_focus(seat);
-		if (focus && c->type == C_WORKSPACE) {
+		if (focus && node->type == N_WORKSPACE) {
 			// Only follow the mouse if it would move to a new output
 			// Otherwise we'll focus the workspace, which is probably wrong
-			if (focus->type != C_OUTPUT) {
+			struct sway_output *focused_output = node_get_output(focus);
-				focus = container_parent(focus, C_OUTPUT);
+			struct sway_output *output = node_get_output(node);
+			if (output != focused_output) {
+				seat_set_focus_warp(seat, node, false, true);
 			}
-			struct sway_container *output = c;
+		} else if (node->type == N_CONTAINER && node->sway_container->view) {
-			if (output->type != C_OUTPUT) {
+			// Focus node if the following are true:
-				output = container_parent(c, C_OUTPUT);
-			}
-			if (output != focus) {
-				seat_set_focus_warp(seat, c, false, true);
-			}
-		} else if (c->type == C_VIEW) {
-			// Focus c if the following are true:
 			// - cursor is over a new view, i.e. entered a new window; and
 			// - the new view is visible, i.e. not hidden in a stack or tab; and
 			// - the seat does not have a keyboard grab
 			if (!wlr_seat_keyboard_has_grab(cursor->seat->wlr_seat) &&
-					c != prev_c &&
+					node != prev_node &&
-					view_is_visible(c->sway_view)) {
+					view_is_visible(node->sway_container->view)) {
-				seat_set_focus_warp(seat, c, false, true);
+				seat_set_focus_warp(seat, node, false, true);
 			} else {
-				struct sway_container *next_focus =
+				struct sway_node *next_focus =
-					seat_get_focus_inactive(seat, &root_container);
+					seat_get_focus_inactive(seat, &root->node);
-				if (next_focus && next_focus->type == C_VIEW &&
+				if (next_focus && next_focus->type == N_CONTAINER &&
-						view_is_visible(next_focus->sway_view)) {
+						next_focus->sway_container->view &&
+						view_is_visible(next_focus->sway_container->view)) {
 					seat_set_focus_warp(seat, next_focus, false, true);
 				}
 			}
@@ -486,12 +469,12 @@ void cursor_send_pointer_motion(struct sway_cursor *cursor, uint32_t time_msec,
 		if (client != cursor->image_client) {
 			cursor_set_image(cursor, "left_ptr", client);
 		}
-	} else if (c) {
+	} else if (node && node->type == N_CONTAINER) {
-		// Try a container's resize edge
+		// Try a node's resize edge
-		enum wlr_edges edge = find_resize_edge(c, cursor);
+		enum wlr_edges edge = find_resize_edge(node->sway_container, cursor);
 		if (edge == WLR_EDGE_NONE) {
 			cursor_set_image(cursor, "left_ptr", NULL);
-		} else if (container_is_floating(c)) {
+		} else if (container_is_floating(node->sway_container)) {
 			cursor_set_image(cursor, wlr_xcursor_get_resize_name(edge), NULL);
 		} else {
 			if (edge & (WLR_EDGE_LEFT | WLR_EDGE_RIGHT)) {
@@ -637,8 +620,10 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 	// Determine what's under the cursor
 	struct wlr_surface *surface = NULL;
 	double sx, sy;
-	struct sway_container *cont = container_at_coords(seat,
+	struct sway_node *node = node_at_coords(seat,
 			cursor->cursor->x, cursor->cursor->y, &surface, &sx, &sy);
+	struct sway_container *cont = node && node->type == N_CONTAINER ?
+		node->sway_container : NULL;
 	bool is_floating = cont && container_is_floating(cont);
 	bool is_floating_or_child = cont && container_is_floating_or_child(cont);
 	bool is_fullscreen_or_child = cont && container_is_fullscreen_or_child(cont);
@@ -670,6 +655,12 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 		return;
 	}
 
+	// Handle clicking an empty workspace
+	if (node && node->type == N_WORKSPACE) {
+		seat_set_focus(seat, node);
+		return;
+	}
+
 	// Handle clicking a layer surface
 	if (surface && wlr_surface_is_layer_surface(surface)) {
 		struct wlr_layer_surface *layer =
@@ -684,7 +675,7 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 	// Handle tiling resize via border
 	if (resize_edge && button == BTN_LEFT && state == WLR_BUTTON_PRESSED &&
 			!is_floating) {
-		seat_set_focus(seat, cont);
+		seat_set_focus(seat, &cont->node);
 		seat_begin_resize_tiling(seat, cont, button, edge);
 		return;
 	}
@@ -713,7 +704,7 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 				image = "sw-resize";
 			}
 			cursor_set_image(seat->cursor, image, NULL);
-			seat_set_focus(seat, cont);
+			seat_set_focus(seat, &cont->node);
 			seat_begin_resize_tiling(seat, cont, button, edge);
 			return;
 		}
@@ -725,7 +716,7 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 		uint32_t btn_move = config->floating_mod_inverse ? BTN_RIGHT : BTN_LEFT;
 		if (button == btn_move && state == WLR_BUTTON_PRESSED &&
 				(mod_pressed || on_titlebar)) {
-			while (cont->parent->type != C_WORKSPACE) {
+			while (cont->parent) {
 				cont = cont->parent;
 			}
 			seat_begin_move(seat, cont, button);
@@ -747,7 +738,7 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 			BTN_LEFT : BTN_RIGHT;
 		if (mod_pressed && button == btn_resize) {
 			struct sway_container *floater = cont;
-			while (floater->parent->type != C_WORKSPACE) {
+			while (floater->parent) {
 				floater = floater->parent;
 			}
 			edge = 0;
@@ -762,7 +753,7 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 
 	// Handle mousedown on a container surface
 	if (surface && cont && state == WLR_BUTTON_PRESSED) {
-		seat_set_focus(seat, cont);
+		seat_set_focus(seat, &cont->node);
 		seat_pointer_notify_button(seat, time_msec, button, state);
 		seat_begin_down(seat, cont, button, sx, sy);
 		return;
@@ -770,7 +761,7 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 
 	// Handle clicking a container surface
 	if (cont) {
-		seat_set_focus(seat, cont);
+		seat_set_focus(seat, &cont->node);
 		seat_pointer_notify_button(seat, time_msec, button, state);
 		return;
 	}
@@ -808,7 +799,7 @@ static void handle_touch_down(struct wl_listener *listener, void *data) {
 	wlr_cursor_absolute_to_layout_coords(cursor->cursor, event->device,
 			event->x, event->y, &lx, &ly);
 	double sx, sy;
-	container_at_coords(seat, lx, ly, &surface, &sx, &sy);
+	node_at_coords(seat, lx, ly, &surface, &sx, &sy);
 
 	seat->touch_id = event->touch_id;
 	seat->touch_x = lx;
@@ -850,7 +841,7 @@ static void handle_touch_motion(struct wl_listener *listener, void *data) {
 	wlr_cursor_absolute_to_layout_coords(cursor->cursor, event->device,
 			event->x, event->y, &lx, &ly);
 	double sx, sy;
-	container_at_coords(cursor->seat, lx, ly, &surface, &sx, &sy);
+	node_at_coords(cursor->seat, lx, ly, &surface, &sx, &sy);
 
 	if (seat->touch_id == event->touch_id) {
 		seat->touch_x = lx;
@@ -1025,8 +1016,7 @@ struct sway_cursor *sway_cursor_create(struct sway_seat *seat) {
 	cursor->previous.y = wlr_cursor->y;
 
 	cursor->seat = seat;
-	wlr_cursor_attach_output_layout(wlr_cursor,
+	wlr_cursor_attach_output_layout(wlr_cursor, root->output_layout);
-		root_container.sway_root->output_layout);
 
 	// input events
 	wl_signal_add(&wlr_cursor->events.motion, &cursor->motion);

sway/input/input-manager.c

@@ -293,12 +293,10 @@ static void handle_inhibit_deactivate(struct wl_listener *listener, void *data)
 	struct sway_seat *seat;
 	wl_list_for_each(seat, &input_manager->seats, link) {
 		seat_set_exclusive_client(seat, NULL);
-		struct sway_container *previous = seat_get_focus(seat);
+		struct sway_node *previous = seat_get_focus(seat);
 		if (previous) {
-			wlr_log(WLR_DEBUG, "Returning focus to %p %s '%s'", previous,
-					container_type_to_str(previous->type), previous->name);
 			// Hack to get seat to re-focus the return value of get_focus
-			seat_set_focus(seat, previous->parent);
+			seat_set_focus(seat, NULL);
 			seat_set_focus(seat, previous);
 		}
 	}
@@ -369,10 +367,10 @@ struct sway_input_manager *input_manager_create(
 }
 
 bool input_manager_has_focus(struct sway_input_manager *input,
-		struct sway_container *container) {
+		struct sway_node *node) {
 	struct sway_seat *seat = NULL;
 	wl_list_for_each(seat, &input->seats, link) {
-		if (seat_get_focus(seat) == container) {
+		if (seat_get_focus(seat) == node) {
 			return true;
 		}
 	}
@@ -381,10 +379,10 @@ bool input_manager_has_focus(struct sway_input_manager *input,
 }
 
 void input_manager_set_focus(struct sway_input_manager *input,
-		struct sway_container *container) {
+		struct sway_node *node) {
 	struct sway_seat *seat;
 	wl_list_for_each(seat, &input->seats, link) {
-		seat_set_focus(seat, container);
+		seat_set_focus(seat, node);
 	}
 }
 

sway/input/seat.c

@@ -47,48 +47,36 @@ void seat_destroy(struct sway_seat *seat) {
 		seat_device_destroy(seat_device);
 	}
 	sway_cursor_destroy(seat->cursor);
-	wl_list_remove(&seat->new_container.link);
+	wl_list_remove(&seat->new_node.link);
 	wl_list_remove(&seat->new_drag_icon.link);
 	wl_list_remove(&seat->link);
 	wlr_seat_destroy(seat->wlr_seat);
 }
 
-static struct sway_seat_container *seat_container_from_container(
+static struct sway_seat_node *seat_node_from_node(
-		struct sway_seat *seat, struct sway_container *con);
+		struct sway_seat *seat, struct sway_node *node);
 
-static void seat_container_destroy(struct sway_seat_container *seat_con) {
+static void seat_node_destroy(struct sway_seat_node *seat_node) {
-	struct sway_container *con = seat_con->container;
+	wl_list_remove(&seat_node->destroy.link);
-	struct sway_container *child = NULL;
+	wl_list_remove(&seat_node->link);
-
+	free(seat_node);
-	if (con->children != NULL) {
-		for (int i = 0; i < con->children->length; ++i) {
-			child = con->children->items[i];
-			struct sway_seat_container *seat_child =
-				seat_container_from_container(seat_con->seat, child);
-			seat_container_destroy(seat_child);
-		}
-	}
-
-	wl_list_remove(&seat_con->destroy.link);
-	wl_list_remove(&seat_con->link);
-	free(seat_con);
 }
 
 /**
  * Activate all views within this container recursively.
  */
-static void seat_send_activate(struct sway_container *con,
+static void seat_send_activate(struct sway_node *node, struct sway_seat *seat) {
-		struct sway_seat *seat) {
+	if (node_is_view(node)) {
-	if (con->type == C_VIEW) {
+		if (!seat_is_input_allowed(seat, node->sway_container->view->surface)) {
-		if (!seat_is_input_allowed(seat, con->sway_view->surface)) {
 			wlr_log(WLR_DEBUG, "Refusing to set focus, input is inhibited");
 			return;
 		}
-		view_set_activated(con->sway_view, true);
+		view_set_activated(node->sway_container->view, true);
 	} else {
-		for (int i = 0; i < con->children->length; ++i) {
+		list_t *children = node_get_children(node);
-			struct sway_container *child = con->children->items[i];
+		for (int i = 0; i < children->length; ++i) {
-			seat_send_activate(child, seat);
+			struct sway_container *child = children->items[i];
+			seat_send_activate(&child->node, seat);
 		}
 	}
 }
@@ -98,14 +86,15 @@ static void seat_send_activate(struct sway_container *con,
  * If con is a container, set all child views as active and don't enable
  * keyboard input on any.
  */
-static void seat_send_focus(struct sway_container *con,
+static void seat_send_focus(struct sway_node *node, struct sway_seat *seat) {
-		struct sway_seat *seat) {
+	seat_send_activate(node, seat);
-	seat_send_activate(con, seat);
 
-	if (con->type == C_VIEW
+	struct sway_view *view = node->type == N_CONTAINER ?
-			&& seat_is_input_allowed(seat, con->sway_view->surface)) {
+		node->sway_container->view : NULL;
+
+	if (view && seat_is_input_allowed(seat, view->surface)) {
 #ifdef HAVE_XWAYLAND
-		if (con->sway_view->type == SWAY_VIEW_XWAYLAND) {
+		if (view->type == SWAY_VIEW_XWAYLAND) {
 			struct wlr_xwayland *xwayland =
 				seat->input->server->xwayland.wlr_xwayland;
 			wlr_xwayland_set_seat(xwayland, seat->wlr_seat);
@@ -114,71 +103,67 @@ static void seat_send_focus(struct sway_container *con,
 		struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat->wlr_seat);
 		if (keyboard) {
 			wlr_seat_keyboard_notify_enter(seat->wlr_seat,
-					con->sway_view->surface, keyboard->keycodes,
+					view->surface, keyboard->keycodes,
 					keyboard->num_keycodes, &keyboard->modifiers);
 		} else {
 			wlr_seat_keyboard_notify_enter(
-					seat->wlr_seat, con->sway_view->surface, NULL, 0, NULL);
+					seat->wlr_seat, view->surface, NULL, 0, NULL);
 		}
 	}
 }
 
-void seat_focus_inactive_children_for_each(struct sway_seat *seat,
+void seat_for_each_node(struct sway_seat *seat,
-		struct sway_container *container,
+		void (*f)(struct sway_node *node, void *data), void *data) {
-		void (*f)(struct sway_container *container, void *data), void *data) {
+	struct sway_seat_node *current = NULL;
-	struct sway_seat_container *current = NULL;
 	wl_list_for_each(current, &seat->focus_stack, link) {
-		if (current->container->parent == NULL) {
+		f(current->node, data);
-			continue;
-		}
-		if (current->container->parent == container) {
-			f(current->container, data);
-		}
 	}
 }
 
 struct sway_container *seat_get_focus_inactive_view(struct sway_seat *seat,
-		struct sway_container *ancestor) {
+		struct sway_node *ancestor) {
-	if (ancestor->type == C_VIEW) {
+	if (ancestor->type == N_CONTAINER && ancestor->sway_container->view) {
-		return ancestor;
+		return ancestor->sway_container;
 	}
-	struct sway_seat_container *current;
+	struct sway_seat_node *current;
 	wl_list_for_each(current, &seat->focus_stack, link) {
-		struct sway_container *con = current->container;
+		struct sway_node *node = current->node;
-		if (con->type == C_VIEW && container_has_ancestor(con, ancestor)) {
+		if (node->type == N_CONTAINER && node->sway_container->view &&
-			return con;
+				node_has_ancestor(node, ancestor)) {
+			return node->sway_container;
 		}
 	}
 	return NULL;
 }
 
-static void handle_seat_container_destroy(struct wl_listener *listener,
+static void handle_seat_node_destroy(struct wl_listener *listener, void *data) {
-		void *data) {
+	struct sway_seat_node *seat_node =
-	struct sway_seat_container *seat_con =
+		wl_container_of(listener, seat_node, destroy);
-		wl_container_of(listener, seat_con, destroy);
+	struct sway_seat *seat = seat_node->seat;
-	struct sway_seat *seat = seat_con->seat;
+	struct sway_node *node = seat_node->node;
-	struct sway_container *con = seat_con->container;
+	struct sway_node *parent = node_get_parent(node);
-	struct sway_container *parent = con->parent;
+	struct sway_node *focus = seat_get_focus(seat);
-	struct sway_container *focus = seat_get_focus(seat);
 
 	bool set_focus =
 		focus != NULL &&
-		(focus == con || container_has_ancestor(focus, con)) &&
+		(focus == node || node_has_ancestor(focus, node)) &&
-		con->type != C_WORKSPACE;
+		node->type == N_CONTAINER;
 
-	seat_container_destroy(seat_con);
+	seat_node_destroy(seat_node);
 
 	if (set_focus) {
-		struct sway_container *next_focus = NULL;
+		struct sway_node *next_focus = NULL;
 		while (next_focus == NULL) {
-			next_focus = seat_get_focus_inactive_view(seat, parent);
+			struct sway_container *con =
+				seat_get_focus_inactive_view(seat, parent);
+			next_focus = con ? &con->node : NULL;
 
-			if (next_focus == NULL && parent->type == C_WORKSPACE) {
+			if (next_focus == NULL && parent->type == N_WORKSPACE) {
 				next_focus = parent;
 				break;
 			}
 
-			parent = parent->parent;
+			parent = node_get_parent(parent);
 		}
 
 		// the structure change might have caused it to move up to the top of
@@ -191,39 +176,39 @@ static void handle_seat_container_destroy(struct wl_listener *listener,
 	}
 }
 
-static struct sway_seat_container *seat_container_from_container(
+static struct sway_seat_node *seat_node_from_node(
-		struct sway_seat *seat, struct sway_container *con) {
+		struct sway_seat *seat, struct sway_node *node) {
-	if (con->type == C_ROOT || con->type == C_OUTPUT) {
+	if (node->type == N_ROOT || node->type == N_OUTPUT) {
-		// these don't get seat containers ever
+		// these don't get seat nodes ever
 		return NULL;
 	}
 
-	struct sway_seat_container *seat_con = NULL;
+	struct sway_seat_node *seat_node = NULL;
-	wl_list_for_each(seat_con, &seat->focus_stack, link) {
+	wl_list_for_each(seat_node, &seat->focus_stack, link) {
-		if (seat_con->container == con) {
+		if (seat_node->node == node) {
-			return seat_con;
+			return seat_node;
 		}
 	}
 
-	seat_con = calloc(1, sizeof(struct sway_seat_container));
+	seat_node = calloc(1, sizeof(struct sway_seat_node));
-	if (seat_con == NULL) {
+	if (seat_node == NULL) {
-		wlr_log(WLR_ERROR, "could not allocate seat container");
+		wlr_log(WLR_ERROR, "could not allocate seat node");
 		return NULL;
 	}
 
-	seat_con->container = con;
+	seat_node->node = node;
-	seat_con->seat = seat;
+	seat_node->seat = seat;
-	wl_list_insert(seat->focus_stack.prev, &seat_con->link);
+	wl_list_insert(seat->focus_stack.prev, &seat_node->link);
-	wl_signal_add(&con->events.destroy, &seat_con->destroy);
+	wl_signal_add(&node->events.destroy, &seat_node->destroy);
-	seat_con->destroy.notify = handle_seat_container_destroy;
+	seat_node->destroy.notify = handle_seat_node_destroy;
 
-	return seat_con;
+	return seat_node;
 }
 
-static void handle_new_container(struct wl_listener *listener, void *data) {
+static void handle_new_node(struct wl_listener *listener, void *data) {
-	struct sway_seat *seat = wl_container_of(listener, seat, new_container);
+	struct sway_seat *seat = wl_container_of(listener, seat, new_node);
-	struct sway_container *con = data;
+	struct sway_node *node = data;
-	seat_container_from_container(seat, con);
+	seat_node_from_node(seat, node);
 }
 
 static void drag_icon_damage_whole(struct sway_drag_icon *icon) {
@@ -272,8 +257,7 @@ static void drag_icon_handle_unmap(struct wl_listener *listener, void *data) {
 	drag_icon_damage_whole(icon);
 }
 
-static void drag_icon_handle_destroy(struct wl_listener *listener,
+static void drag_icon_handle_destroy(struct wl_listener *listener, void *data) {
-		void *data) {
 	struct sway_drag_icon *icon = wl_container_of(listener, icon, destroy);
 	icon->wlr_drag_icon->data = NULL;
 	wl_list_remove(&icon->link);
@@ -305,20 +289,29 @@ static void handle_new_drag_icon(struct wl_listener *listener, void *data) {
 	icon->destroy.notify = drag_icon_handle_destroy;
 	wl_signal_add(&wlr_drag_icon->events.destroy, &icon->destroy);
 
-	wl_list_insert(&root_container.sway_root->drag_icons, &icon->link);
+	wl_list_insert(&root->drag_icons, &icon->link);
 
 	drag_icon_update_position(icon);
 }
 
-static void collect_focus_iter(struct sway_container *con, void *data) {
+static void collect_focus_iter(struct sway_node *node, void *data) {
 	struct sway_seat *seat = data;
-	struct sway_seat_container *seat_con =
+	struct sway_seat_node *seat_node = seat_node_from_node(seat, node);
-		seat_container_from_container(seat, con);
+	if (!seat_node) {
-	if (!seat_con) {
 		return;
 	}
-	wl_list_remove(&seat_con->link);
+	wl_list_remove(&seat_node->link);
-	wl_list_insert(&seat->focus_stack, &seat_con->link);
+	wl_list_insert(&seat->focus_stack, &seat_node->link);
+}
+
+static void collect_focus_workspace_iter(struct sway_workspace *workspace,
+		void *data) {
+	collect_focus_iter(&workspace->node, data);
+}
+
+static void collect_focus_container_iter(struct sway_container *container,
+		void *data) {
+	collect_focus_iter(&container->node, data);
 }
 
 struct sway_seat *seat_create(struct sway_input_manager *input,
@@ -345,12 +338,11 @@ struct sway_seat *seat_create(struct sway_input_manager *input,
 	// init the focus stack
 	wl_list_init(&seat->focus_stack);
 
-	root_for_each_workspace(collect_focus_iter, seat);
+	root_for_each_workspace(collect_focus_workspace_iter, seat);
-	root_for_each_container(collect_focus_iter, seat);
+	root_for_each_container(collect_focus_container_iter, seat);
 
-	wl_signal_add(&root_container.sway_root->events.new_container,
+	wl_signal_add(&root->events.new_node, &seat->new_node);
-		&seat->new_container);
+	seat->new_node.notify = handle_new_node;
-	seat->new_container.notify = handle_new_container;
 
 	wl_signal_add(&seat->wlr_seat->events.new_drag_icon, &seat->new_drag_icon);
 	seat->new_drag_icon.notify = handle_new_drag_icon;
@@ -388,19 +380,11 @@ static void seat_apply_input_config(struct sway_seat *seat,
 	if (mapped_to_output != NULL) {
 		wlr_log(WLR_DEBUG, "Mapping input device %s to output %s",
 			sway_device->input_device->identifier, mapped_to_output);
-		struct sway_container *output = NULL;
+		struct sway_output *output = output_by_name(mapped_to_output);
-		for (int i = 0; i < root_container.children->length; ++i) {
-			struct sway_container *_output = root_container.children->items[i];
-			if (strcasecmp(_output->name, mapped_to_output) == 0) {
-				output = _output;
-				break;
-			}
-		}
 		if (output) {
 			wlr_cursor_map_input_to_output(seat->cursor->cursor,
-				sway_device->input_device->wlr_device,
+				sway_device->input_device->wlr_device, output->wlr_output);
-				output->sway_output->wlr_output);
+			wlr_log(WLR_DEBUG, "Mapped to output %s", output->wlr_output->name);
-			wlr_log(WLR_DEBUG, "Mapped to output %s", output->name);
 		}
 	}
 }
@@ -423,12 +407,12 @@ static void seat_configure_keyboard(struct sway_seat *seat,
 	sway_keyboard_configure(seat_device->keyboard);
 	wlr_seat_set_keyboard(seat->wlr_seat,
 			seat_device->input_device->wlr_device);
-	struct sway_container *focus = seat_get_focus(seat);
+	struct sway_node *focus = seat_get_focus(seat);
-	if (focus && focus->type == C_VIEW) {
+	if (focus && node_is_view(focus)) {
 		// force notify reenter to pick up the new configuration
 		wlr_seat_keyboard_clear_focus(seat->wlr_seat);
 		wlr_seat_keyboard_notify_enter(seat->wlr_seat,
-				focus->sway_view->surface, wlr_keyboard->keycodes,
+				focus->sway_container->view->surface, wlr_keyboard->keycodes,
 				wlr_keyboard->num_keycodes, &wlr_keyboard->modifiers);
 	}
 }
@@ -461,8 +445,7 @@ static struct sway_seat_device *seat_get_device(struct sway_seat *seat,
 
 void seat_configure_device(struct sway_seat *seat,
 		struct sway_input_device *input_device) {
-	struct sway_seat_device *seat_device =
+	struct sway_seat_device *seat_device = seat_get_device(seat, input_device);
-		seat_get_device(seat, input_device);
 	if (!seat_device) {
 		return;
 	}
@@ -512,8 +495,7 @@ void seat_add_device(struct sway_seat *seat,
 
 void seat_remove_device(struct sway_seat *seat,
 		struct sway_input_device *input_device) {
-	struct sway_seat_device *seat_device =
+	struct sway_seat_device *seat_device = seat_get_device(seat, input_device);
-		seat_get_device(seat, input_device);
 
 	if (!seat_device) {
 		return;
@@ -539,11 +521,9 @@ void seat_configure_xcursor(struct sway_seat *seat) {
 		}
 	}
 
-	for (int i = 0; i < root_container.children->length; ++i) {
+	for (int i = 0; i < root->outputs->length; ++i) {
-		struct sway_container *output_container =
+		struct sway_output *sway_output = root->outputs->items[i];
-			root_container.children->items[i];
+		struct wlr_output *output = sway_output->wlr_output;
-		struct wlr_output *output =
-			output_container->sway_output->wlr_output;
 		bool result =
 			wlr_xcursor_manager_load(seat->cursor->xcursor_manager,
 				output->scale);
@@ -566,17 +546,20 @@ bool seat_is_input_allowed(struct sway_seat *seat,
 	return !seat->exclusive_client || seat->exclusive_client == client;
 }
 
+static void send_unfocus(struct sway_container *con, void *data) {
+	if (con->view) {
+		view_set_activated(con->view, false);
+	}
+}
+
 // Unfocus the container and any children (eg. when leaving `focus parent`)
-static void seat_send_unfocus(struct sway_container *container,
+static void seat_send_unfocus(struct sway_node *node, struct sway_seat *seat) {
-		struct sway_seat *seat) {
+	wlr_seat_keyboard_clear_focus(seat->wlr_seat);
-	if (container->type == C_VIEW) {
+	if (node->type == N_WORKSPACE) {
-		wlr_seat_keyboard_clear_focus(seat->wlr_seat);
+		workspace_for_each_container(node->sway_workspace, send_unfocus, seat);
-		view_set_activated(container->sway_view, false);
 	} else {
-		for (int i = 0; i < container->children->length; ++i) {
+		send_unfocus(node->sway_container, seat);
-			struct sway_container *child = container->children->items[i];
+		container_for_each_child(node->sway_container, send_unfocus, seat);
-			seat_send_unfocus(child, seat);
-		}
 	}
 }
 
@@ -586,26 +569,23 @@ static int handle_urgent_timeout(void *data) {
 	return 0;
 }
 
-void seat_set_focus_warp(struct sway_seat *seat,
+void seat_set_focus_warp(struct sway_seat *seat, struct sway_node *node,
-		struct sway_container *container, bool warp, bool notify) {
+		bool warp, bool notify) {
 	if (seat->focused_layer) {
 		return;
 	}
 
-	struct sway_container *last_focus = seat_get_focus(seat);
+	struct sway_node *last_focus = seat_get_focus(seat);
-	if (last_focus == container) {
+	if (last_focus == node) {
 		return;
 	}
 
-	struct sway_container *last_workspace = last_focus;
+	struct sway_workspace *last_workspace = seat_get_focused_workspace(seat);
-	if (last_workspace && last_workspace->type != C_WORKSPACE) {
-		last_workspace = container_parent(last_workspace, C_WORKSPACE);
-	}
 
-	if (container == NULL) {
+	if (node == NULL) {
 		// Close any popups on the old focus
-		if (last_focus->type == C_VIEW) {
+		if (node_is_view(last_focus)) {
-			view_close_popups(last_focus->sway_view);
+			view_close_popups(last_focus->sway_container->view);
 		}
 		seat_send_unfocus(last_focus, seat);
 		seat->has_focus = false;
@@ -613,69 +593,71 @@ void seat_set_focus_warp(struct sway_seat *seat,
 		return;
 	}
 
-	struct sway_container *new_workspace = container;
+	struct sway_workspace *new_workspace = node->type == N_WORKSPACE ?
-	if (new_workspace->type != C_WORKSPACE) {
+		node->sway_workspace : node->sway_container->workspace;
-		new_workspace = container_parent(new_workspace, C_WORKSPACE);
+	struct sway_container *container = node->type == N_CONTAINER ?
-	}
+		node->sway_container : NULL;
 
-	if (last_workspace == new_workspace
+	// Deny setting focus to a view which is hidden by a fullscreen container
-			&& last_workspace->sway_workspace->fullscreen
+	if (new_workspace && new_workspace->fullscreen && container &&
-			&& !container_is_fullscreen_or_child(container)) {
+			!container_is_fullscreen_or_child(container)) {
 		return;
 	}
 
-	struct sway_container *last_output = last_focus;
+	struct sway_output *last_output = last_workspace ?
-	if (last_output && last_output->type != C_OUTPUT) {
+		last_workspace->output : NULL;
-		last_output = container_parent(last_output, C_OUTPUT);
+	struct sway_output *new_output = new_workspace->output;
-	}
-	struct sway_container *new_output = container;
-	if (new_output->type != C_OUTPUT) {
-		new_output = container_parent(new_output, C_OUTPUT);
-	}
 
 	// find new output's old workspace, which might have to be removed if empty
-	struct sway_container *new_output_last_ws = NULL;
+	struct sway_workspace *new_output_last_ws = NULL;
 	if (new_output && last_output != new_output) {
-		new_output_last_ws = seat_get_active_child(seat, new_output);
+		new_output_last_ws = output_get_active_workspace(new_output);
 	}
 
-	if (container->parent) {
+	// Unfocus the previous focus
-		struct sway_seat_container *seat_con =
+	if (last_focus) {
-			seat_container_from_container(seat, container);
+		seat_send_unfocus(last_focus, seat);
-		if (seat_con == NULL) {
+		node_set_dirty(last_focus);
-			return;
+		struct sway_node *parent = node_get_parent(last_focus);
+		if (parent) {
+			node_set_dirty(parent);
 		}
+	}
 
-		// put all the ancestors of this container on top of the focus stack
+	// Put the container parents on the focus stack, then the workspace, then
-		struct sway_seat_container *parent =
+	// the focused container.
-			seat_container_from_container(seat, container->parent);
+	if (container) {
+		struct sway_container *parent = container->parent;
 		while (parent) {
-			wl_list_remove(&parent->link);
+			struct sway_seat_node *seat_node =
-			wl_list_insert(&seat->focus_stack, &parent->link);
+				seat_node_from_node(seat, &parent->node);
-			container_set_dirty(parent->container);
+			wl_list_remove(&seat_node->link);
-
+			wl_list_insert(&seat->focus_stack, &seat_node->link);
-			parent = seat_container_from_container(seat,
+			node_set_dirty(&parent->node);
-					parent->container->parent);
+			parent = parent->parent;
 		}
-
+	}
-		wl_list_remove(&seat_con->link);
+	if (new_workspace) {
-		wl_list_insert(&seat->focus_stack, &seat_con->link);
+		struct sway_seat_node *seat_node =
-
+			seat_node_from_node(seat, &new_workspace->node);
-		if (last_focus) {
+		wl_list_remove(&seat_node->link);
-			seat_send_unfocus(last_focus, seat);
+		wl_list_insert(&seat->focus_stack, &seat_node->link);
-			container_set_dirty(last_focus);
+		node_set_dirty(&new_workspace->node);
-		}
+	}
-		seat_send_focus(container, seat);
+	if (container) {
-
+		struct sway_seat_node *seat_node =
-		container_set_dirty(container);
+			seat_node_from_node(seat, &container->node);
-		container_set_dirty(container->parent); // for focused_inactive_child
+		wl_list_remove(&seat_node->link);
+		wl_list_insert(&seat->focus_stack, &seat_node->link);
+		node_set_dirty(&container->node);
+		seat_send_focus(&container->node, seat);
 	}
 
 	// emit ipc events
 	if (notify && new_workspace && last_workspace != new_workspace) {
 		 ipc_event_workspace(last_workspace, new_workspace, "focus");
 	}
-	if (container->type == C_VIEW) {
+	if (container && container->view) {
 		ipc_event_window(container, "focus");
 	}
 
@@ -684,14 +666,14 @@ void seat_set_focus_warp(struct sway_seat *seat,
 	}
 
 	// Close any popups on the old focus
-	if (last_focus && last_focus->type == C_VIEW) {
+	if (last_focus && node_is_view(last_focus)) {
-		view_close_popups(last_focus->sway_view);
+		view_close_popups(last_focus->sway_container->view);
 	}
 
 	// If urgent, either unset the urgency or start a timer to unset it
-	if (container->type == C_VIEW && view_is_urgent(container->sway_view) &&
+	if (container && container->view && view_is_urgent(container->view) &&
-			!container->sway_view->urgent_timer) {
+			!container->view->urgent_timer) {
-		struct sway_view *view = container->sway_view;
+		struct sway_view *view = container->view;
 		if (last_workspace && last_workspace != new_workspace &&
 				config->urgent_timeout > 0) {
 			view->urgent_timer = wl_event_loop_add_timer(server.wl_event_loop,
@@ -711,12 +693,15 @@ void seat_set_focus_warp(struct sway_seat *seat,
 
 	// If we've focused a floating container, bring it to the front.
 	// We do this by putting it at the end of the floating list.
-	struct sway_container *floater = container;
+	if (container) {
-	while (floater->parent && floater->parent->type != C_WORKSPACE) {
+		struct sway_container *floater = container;
-		floater = floater->parent;
+		while (floater->parent) {
-	}
+			floater = floater->parent;
-	if (container_is_floating(floater)) {
+		}
-		list_move_to_end(floater->parent->sway_workspace->floating, floater);
+		if (container_is_floating(floater)) {
+			list_move_to_end(floater->workspace->floating, floater);
+			node_set_dirty(&floater->workspace->node);
+		}
 	}
 
 	if (last_focus) {
@@ -725,16 +710,20 @@ void seat_set_focus_warp(struct sway_seat *seat,
 		}
 
 		if (config->mouse_warping && warp && new_output != last_output) {
-				double x = container->x + container->width / 2.0;
+			double x = 0;
-				double y = container->y + container->height / 2.0;
+			double y = 0;
-				struct wlr_output *wlr_output =
+			if (container) {
-					new_output->sway_output->wlr_output;
+				x = container->x + container->width / 2.0;
-				if (!wlr_output_layout_contains_point(
+				y = container->y + container->height / 2.0;
-						root_container.sway_root->output_layout,
+			} else {
-						wlr_output, seat->cursor->cursor->x,
+				x = new_workspace->x + new_workspace->width / 2.0;
-						seat->cursor->cursor->y)) {
+				y = new_workspace->y + new_workspace->height / 2.0;
-					wlr_cursor_warp(seat->cursor->cursor, NULL, x, y);
+			}
-					cursor_send_pointer_motion(seat->cursor, 0, true);
+			if (!wlr_output_layout_contains_point(root->output_layout,
+					new_output->wlr_output, seat->cursor->cursor->x,
+					seat->cursor->cursor->y)) {
+				wlr_cursor_warp(seat->cursor->cursor, NULL, x, y);
+				cursor_send_pointer_motion(seat->cursor, 0, true);
 			}
 		}
 	}
@@ -744,9 +733,8 @@ void seat_set_focus_warp(struct sway_seat *seat,
 	update_debug_tree();
 }
 
-void seat_set_focus(struct sway_seat *seat,
+void seat_set_focus(struct sway_seat *seat, struct sway_node *node) {
-		struct sway_container *container) {
+	seat_set_focus_warp(seat, node, true, true);
-	seat_set_focus_warp(seat, container, true, true);
 }
 
 void seat_set_focus_surface(struct sway_seat *seat,
@@ -755,12 +743,11 @@ void seat_set_focus_surface(struct sway_seat *seat,
 		return;
 	}
 	if (seat->has_focus && unfocus) {
-		struct sway_container *focus = seat_get_focus(seat);
+		struct sway_node *focus = seat_get_focus(seat);
 		seat_send_unfocus(focus, seat);
 		seat->has_focus = false;
 	}
-	struct wlr_keyboard *keyboard =
+	struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat->wlr_seat);
-		wlr_seat_get_keyboard(seat->wlr_seat);
 	if (keyboard) {
 		wlr_seat_keyboard_notify_enter(seat->wlr_seat, surface,
 			keyboard->keycodes, keyboard->num_keycodes, &keyboard->modifiers);
@@ -773,11 +760,8 @@ void seat_set_focus_layer(struct sway_seat *seat,
 		struct wlr_layer_surface *layer) {
 	if (!layer && seat->focused_layer) {
 		seat->focused_layer = NULL;
-		struct sway_container *previous =
+		struct sway_node *previous = seat_get_focus_inactive(seat, &root->node);
-			seat_get_focus_inactive(seat, &root_container);
 		if (previous) {
-			wlr_log(WLR_DEBUG, "Returning focus to %p %s '%s'", previous,
-					container_type_to_str(previous->type), previous->name);
 			// Hack to get seat to re-focus the return value of get_focus
 			seat_set_focus(seat, NULL);
 			seat_set_focus(seat, previous);
@@ -798,13 +782,9 @@ void seat_set_exclusive_client(struct sway_seat *seat,
 		seat->exclusive_client = client;
 		// Triggers a refocus of the topmost surface layer if necessary
 		// TODO: Make layer surface focus per-output based on cursor position
-		for (int i = 0; i < root_container.children->length; ++i) {
+		for (int i = 0; i < root->outputs->length; ++i) {
-			struct sway_container *output = root_container.children->items[i];
+			struct sway_output *output = root->outputs->items[i];
-			if (!sway_assert(output->type == C_OUTPUT,
+			arrange_layers(output);
-						"root container has non-output child")) {
-				continue;
-			}
-			arrange_layers(output->sway_output);
 		}
 		return;
 	}
@@ -814,9 +794,9 @@ void seat_set_exclusive_client(struct sway_seat *seat,
 		}
 	}
 	if (seat->has_focus) {
-		struct sway_container *focus = seat_get_focus(seat);
+		struct sway_node *focus = seat_get_focus(seat);
-		if (focus->type == C_VIEW && wl_resource_get_client(
+		if (node_is_view(focus) && wl_resource_get_client(
-					focus->sway_view->surface->resource) != client) {
+					focus->sway_container->view->surface->resource) != client) {
 			seat_set_focus(seat, NULL);
 		}
 	}
@@ -837,79 +817,101 @@ void seat_set_exclusive_client(struct sway_seat *seat,
 	seat->exclusive_client = client;
 }
 
-struct sway_container *seat_get_focus_inactive(struct sway_seat *seat,
+struct sway_node *seat_get_focus_inactive(struct sway_seat *seat,
-		struct sway_container *con) {
+		struct sway_node *node) {
-	if (con->type == C_WORKSPACE && !con->children->length &&
+	if (node_is_view(node)) {
-			!con->sway_workspace->floating->length) {
+		return node;
-		return con;
 	}
-	if (con->type == C_VIEW) {
+	struct sway_seat_node *current;
-		return con;
-	}
-	struct sway_seat_container *current;
 	wl_list_for_each(current, &seat->focus_stack, link) {
-		if (container_has_ancestor(current->container, con)) {
+		if (node_has_ancestor(current->node, node)) {
-			return current->container;
+			return current->node;
 		}
 	}
+	if (node->type == N_WORKSPACE) {
+		return node;
+	}
 	return NULL;
 }
 
 struct sway_container *seat_get_focus_inactive_tiling(struct sway_seat *seat,
-		struct sway_container *ancestor) {
+		struct sway_workspace *workspace) {
-	if (ancestor->type == C_WORKSPACE && !ancestor->children->length) {
+	if (!workspace->tiling->length) {
-		return ancestor;
+		return NULL;
 	}
-	struct sway_seat_container *current;
+	struct sway_seat_node *current;
 	wl_list_for_each(current, &seat->focus_stack, link) {
-		struct sway_container *con = current->container;
+		struct sway_node *node = current->node;
-		if (!container_is_floating_or_child(con) &&
+		if (node->type == N_CONTAINER &&
-				container_has_ancestor(current->container, ancestor)) {
+				!container_is_floating_or_child(node->sway_container) &&
-			return con;
+				node->sway_container->workspace == workspace) {
+			return node->sway_container;
 		}
 	}
 	return NULL;
 }
 
 struct sway_container *seat_get_focus_inactive_floating(struct sway_seat *seat,
-		struct sway_container *ancestor) {
+		struct sway_workspace *workspace) {
-	if (ancestor->type == C_WORKSPACE &&
+	if (!workspace->floating->length) {
-			!ancestor->sway_workspace->floating->length) {
 		return NULL;
 	}
-	struct sway_seat_container *current;
+	struct sway_seat_node *current;
 	wl_list_for_each(current, &seat->focus_stack, link) {
-		struct sway_container *con = current->container;
+		struct sway_node *node = current->node;
-		if (container_is_floating_or_child(con) &&
+		if (node->type == N_CONTAINER &&
-				container_has_ancestor(current->container, ancestor)) {
+				container_is_floating_or_child(node->sway_container) &&
-			return con;
+				node->sway_container->workspace == workspace) {
+			return node->sway_container;
 		}
 	}
 	return NULL;
 }
 
-struct sway_container *seat_get_active_child(struct sway_seat *seat,
+struct sway_node *seat_get_active_child(struct sway_seat *seat,
-		struct sway_container *parent) {
+		struct sway_node *parent) {
-	if (parent->type == C_VIEW) {
+	if (node_is_view(parent)) {
 		return parent;
 	}
-	struct sway_seat_container *current;
+	struct sway_seat_node *current;
 	wl_list_for_each(current, &seat->focus_stack, link) {
-		struct sway_container *con = current->container;
+		struct sway_node *node = current->node;
-		if (con->parent == parent) {
+		if (node_get_parent(node) == parent) {
-			return con;
+			return node;
 		}
 	}
 	return NULL;
 }
 
-struct sway_container *seat_get_focus(struct sway_seat *seat) {
+struct sway_node *seat_get_focus(struct sway_seat *seat) {
 	if (!seat->has_focus) {
 		return NULL;
 	}
-	struct sway_seat_container *current =
+	struct sway_seat_node *current =
 		wl_container_of(seat->focus_stack.next, current, link);
-	return current->container;
+	return current->node;
+}
+
+struct sway_workspace *seat_get_focused_workspace(struct sway_seat *seat) {
+	struct sway_node *focus = seat_get_focus(seat);
+	if (!focus) {
+		return NULL;
+	}
+	if (focus->type == N_CONTAINER) {
+		return focus->sway_container->workspace;
+	}
+	if (focus->type == N_WORKSPACE) {
+		return focus->sway_workspace;
+	}
+	return NULL; // unreachable
+}
+
+struct sway_container *seat_get_focused_container(struct sway_seat *seat) {
+	struct sway_node *focus = seat_get_focus(seat);
+	if (focus && focus->type == N_CONTAINER) {
+		return focus->sway_container;
+	}
+	return NULL;
 }
 
 void seat_apply_config(struct sway_seat *seat,

sway/ipc-json.c

@@ -46,18 +46,18 @@ json_object *ipc_json_get_version() {
 	return version;
 }
 
-static json_object *ipc_json_create_rect(struct sway_container *c) {
+static json_object *ipc_json_create_rect(struct wlr_box *box) {
 	json_object *rect = json_object_new_object();
 
-	json_object_object_add(rect, "x", json_object_new_int((int32_t)c->x));
+	json_object_object_add(rect, "x", json_object_new_int(box->x));
-	json_object_object_add(rect, "y", json_object_new_int((int32_t)c->y));
+	json_object_object_add(rect, "y", json_object_new_int(box->y));
-	json_object_object_add(rect, "width", json_object_new_int((int32_t)c->width));
+	json_object_object_add(rect, "width", json_object_new_int(box->width));
-	json_object_object_add(rect, "height", json_object_new_int((int32_t)c->height));
+	json_object_object_add(rect, "height", json_object_new_int(box->height));
 
 	return rect;
 }
 
-static void ipc_json_describe_root(struct sway_container *root, json_object *object) {
+static void ipc_json_describe_root(struct sway_root *root, json_object *object) {
 	json_object_object_add(object, "type", json_object_new_string("root"));
 	json_object_object_add(object, "layout", json_object_new_string("splith"));
 }
@@ -84,17 +84,13 @@ static const char *ipc_json_get_output_transform(enum wl_output_transform transf
 	return NULL;
 }
 
-static void ipc_json_describe_output(struct sway_container *container,
+static void ipc_json_describe_output(struct sway_output *output,
 		json_object *object) {
-	struct wlr_output *wlr_output = container->sway_output->wlr_output;
+	struct wlr_output *wlr_output = output->wlr_output;
-	json_object_object_add(object, "type",
+	json_object_object_add(object, "type", json_object_new_string("output"));
-			json_object_new_string("output"));
+	json_object_object_add(object, "active", json_object_new_boolean(true));
-	json_object_object_add(object, "active",
+	json_object_object_add(object, "primary", json_object_new_boolean(false));
-			json_object_new_boolean(true));
+	json_object_object_add(object, "layout", json_object_new_string("output"));
-	json_object_object_add(object, "primary",
-			json_object_new_boolean(false));
-	json_object_object_add(object, "layout",
-			json_object_new_string("output"));
 	json_object_object_add(object, "make",
 			json_object_new_string(wlr_output->make));
 	json_object_object_add(object, "model",
@@ -109,20 +105,9 @@ static void ipc_json_describe_output(struct sway_container *container,
 		json_object_new_string(
 			ipc_json_get_output_transform(wlr_output->transform)));
 
-	struct sway_seat *seat = input_manager_get_default_seat(input_manager);
+	struct sway_workspace *ws = output_get_active_workspace(output);
-	const char *ws = NULL;
-	if (seat) {
-		struct sway_container *focus =
-			seat_get_focus_inactive(seat, container);
-		if (focus && focus->type != C_WORKSPACE) {
-			focus = container_parent(focus, C_WORKSPACE);
-		}
-		if (focus) {
-			ws = focus->name;
-		}
-	}
 	json_object_object_add(object, "current_workspace",
-			json_object_new_string(ws));
+			json_object_new_string(ws->name));
 
 	json_object *modes_array = json_object_new_array();
 	struct wlr_output_mode *mode;
@@ -161,60 +146,57 @@ json_object *ipc_json_describe_disabled_output(struct sway_output *output) {
 	return object;
 }
 
-static void ipc_json_describe_workspace(struct sway_container *workspace,
+static void ipc_json_describe_workspace(struct sway_workspace *workspace,
 		json_object *object) {
 	int num = isdigit(workspace->name[0]) ? atoi(workspace->name) : -1;
 
 	json_object_object_add(object, "num", json_object_new_int(num));
-	json_object_object_add(object, "output", workspace->parent ?
+	json_object_object_add(object, "output", workspace->output ?
-			json_object_new_string(workspace->parent->name) : NULL);
+			json_object_new_string(workspace->output->wlr_output->name) : NULL);
 	json_object_object_add(object, "type", json_object_new_string("workspace"));
 	json_object_object_add(object, "urgent",
-			json_object_new_boolean(workspace->sway_workspace->urgent));
+			json_object_new_boolean(workspace->urgent));
-	json_object_object_add(object, "representation", workspace->formatted_title ?
+	json_object_object_add(object, "representation", workspace->representation ?
-			json_object_new_string(workspace->formatted_title) : NULL);
+			json_object_new_string(workspace->representation) : NULL);
 
 	const char *layout = ipc_json_layout_description(workspace->layout);
 	json_object_object_add(object, "layout", json_object_new_string(layout));
 
 	// Floating
 	json_object *floating_array = json_object_new_array();
-	list_t *floating = workspace->sway_workspace->floating;
+	for (int i = 0; i < workspace->floating->length; ++i) {
-	for (int i = 0; i < floating->length; ++i) {
+		struct sway_container *floater = workspace->floating->items[i];
-		struct sway_container *floater = floating->items[i];
 		json_object_array_add(floating_array,
-				ipc_json_describe_container_recursive(floater));
+				ipc_json_describe_node_recursive(&floater->node));
 	}
 	json_object_object_add(object, "floating_nodes", floating_array);
 }
 
 static void ipc_json_describe_view(struct sway_container *c, json_object *object) {
 	json_object_object_add(object, "name",
-			c->name ? json_object_new_string(c->name) : NULL);
+			c->title ? json_object_new_string(c->title) : NULL);
 	json_object_object_add(object, "type", json_object_new_string("con"));
 
-	if (c->type == C_VIEW) {
+	if (c->view) {
-		const char *app_id = view_get_app_id(c->sway_view);
+		const char *app_id = view_get_app_id(c->view);
 		json_object_object_add(object, "app_id",
 				app_id ? json_object_new_string(app_id) : NULL);
 
-		const char *class = view_get_class(c->sway_view);
+		const char *class = view_get_class(c->view);
 		json_object_object_add(object, "class",
 				class ? json_object_new_string(class) : NULL);
 	}
 
-	if (c->parent) {
+	json_object_object_add(object, "layout",
-		json_object_object_add(object, "layout",
+		json_object_new_string(ipc_json_layout_description(c->layout)));
-			json_object_new_string(ipc_json_layout_description(c->layout)));
-	}
 
-	bool urgent = c->type == C_VIEW ?
+	bool urgent = c->view ?
-		view_is_urgent(c->sway_view) : container_has_urgent_child(c);
+		view_is_urgent(c->view) : container_has_urgent_child(c);
 	json_object_object_add(object, "urgent", json_object_new_boolean(urgent));
 
-	if (c->type == C_VIEW) {
+	if (c->view) {
 		json_object *marks = json_object_new_array();
-		list_t *view_marks = c->sway_view->marks;
+		list_t *view_marks = c->view->marks;
 		for (int i = 0; i < view_marks->length; ++i) {
 			json_object_array_add(marks, json_object_new_string(view_marks->items[i]));
 		}
@@ -222,64 +204,97 @@ static void ipc_json_describe_view(struct sway_container *c, json_object *object
 	}
 }
 
-static void focus_inactive_children_iterator(struct sway_container *c, void *data) {
+struct focus_inactive_data {
-	json_object *focus = data;
+	struct sway_node *node;
-	json_object_array_add(focus, json_object_new_int(c->id));
+	json_object *object;
+};
+
+static void focus_inactive_children_iterator(struct sway_node *node,
+		void *_data) {
+	struct focus_inactive_data *data = _data;
+	if (node_get_parent(node) == data->node) {
+		json_object_array_add(data->object, json_object_new_int(node->id));
+	}
 }
 
-json_object *ipc_json_describe_container(struct sway_container *c) {
+json_object *ipc_json_describe_node(struct sway_node *node) {
-	if (!(sway_assert(c, "Container must not be null."))) {
-		return NULL;
-	}
-
 	struct sway_seat *seat = input_manager_get_default_seat(input_manager);
-	bool focused = seat_get_focus(seat) == c;
+	bool focused = seat_get_focus(seat) == node;
 
 	json_object *object = json_object_new_object();
+	char *name = node_get_name(node);
 
-	json_object_object_add(object, "id", json_object_new_int((int)c->id));
+	struct wlr_box box;
+	node_get_box(node, &box);
+	json_object_object_add(object, "id", json_object_new_int((int)node->id));
 	json_object_object_add(object, "name",
-			c->name ? json_object_new_string(c->name) : NULL);
+			name ? json_object_new_string(name) : NULL);
-	json_object_object_add(object, "rect", ipc_json_create_rect(c));
+	json_object_object_add(object, "rect", ipc_json_create_rect(&box));
-	json_object_object_add(object, "focused",
+	json_object_object_add(object, "focused", json_object_new_boolean(focused));
-			json_object_new_boolean(focused));
 
 	json_object *focus = json_object_new_array();
-	seat_focus_inactive_children_for_each(seat, c,
+	struct focus_inactive_data data = {
-		focus_inactive_children_iterator, focus);
+		.node = node,
+		.object = focus,
+	};
+	seat_for_each_node(seat, focus_inactive_children_iterator, &data);
 	json_object_object_add(object, "focus", focus);
 
-	switch (c->type) {
+	switch (node->type) {
-	case C_ROOT:
+	case N_ROOT:
-		ipc_json_describe_root(c, object);
+		ipc_json_describe_root(root, object);
 		break;
-	case C_OUTPUT:
+	case N_OUTPUT:
-		ipc_json_describe_output(c, object);
+		ipc_json_describe_output(node->sway_output, object);
 		break;
-	case C_CONTAINER:
+	case N_CONTAINER:
-	case C_VIEW:
+		ipc_json_describe_view(node->sway_container, object);
-		ipc_json_describe_view(c, object);
 		break;
-	case C_WORKSPACE:
+	case N_WORKSPACE:
-		ipc_json_describe_workspace(c, object);
+		ipc_json_describe_workspace(node->sway_workspace, object);
-		break;
-	case C_TYPES:
-	default:
 		break;
 	}
 
 	return object;
 }
 
-json_object *ipc_json_describe_container_recursive(struct sway_container *c) {
+json_object *ipc_json_describe_node_recursive(struct sway_node *node) {
-	json_object *object = ipc_json_describe_container(c);
+	json_object *object = ipc_json_describe_node(node);
 	int i;
 
 	json_object *children = json_object_new_array();
-	if (c->type != C_VIEW && c->children) {
+	switch (node->type) {
-		for (i = 0; i < c->children->length; ++i) {
+	case N_ROOT:
-			json_object_array_add(children, ipc_json_describe_container_recursive(c->children->items[i]));
+		for (i = 0; i < root->outputs->length; ++i) {
+			struct sway_output *output = root->outputs->items[i];
+			json_object_array_add(children,
+					ipc_json_describe_node_recursive(&output->node));
 		}
+		break;
+	case N_OUTPUT:
+		for (i = 0; i < node->sway_output->workspaces->length; ++i) {
+			struct sway_workspace *ws = node->sway_output->workspaces->items[i];
+			json_object_array_add(children,
+					ipc_json_describe_node_recursive(&ws->node));
+		}
+		break;
+	case N_WORKSPACE:
+		for (i = 0; i < node->sway_workspace->tiling->length; ++i) {
+			struct sway_container *con = node->sway_workspace->tiling->items[i];
+			json_object_array_add(children,
+					ipc_json_describe_node_recursive(&con->node));
+		}
+		break;
+	case N_CONTAINER:
+		if (node->sway_container->children) {
+			for (i = 0; i < node->sway_container->children->length; ++i) {
+				struct sway_container *child =
+					node->sway_container->children->items[i];
+				json_object_array_add(children,
+						ipc_json_describe_node_recursive(&child->node));
+			}
+		}
+		break;
 	}
 	json_object_object_add(object, "nodes", children);
 
@@ -329,7 +344,7 @@ json_object *ipc_json_describe_seat(struct sway_seat *seat) {
 	}
 
 	json_object *object = json_object_new_object();
-	struct sway_container *focus = seat_get_focus(seat);
+	struct sway_node *focus = seat_get_focus(seat);
 
 	json_object_object_add(object, "name",
 		json_object_new_string(seat->wlr_seat->name));

sway/ipc-server.c

@@ -33,6 +33,7 @@
 #include "sway/input/seat.h"
 #include "sway/tree/root.h"
 #include "sway/tree/view.h"
+#include "sway/tree/workspace.h"
 #include "list.h"
 #include "log.h"
 #include "util.h"
@@ -291,8 +292,8 @@ static void ipc_send_event(const char *json_string, enum ipc_command_type event)
 	}
 }
 
-void ipc_event_workspace(struct sway_container *old,
+void ipc_event_workspace(struct sway_workspace *old,
-		struct sway_container *new, const char *change) {
+		struct sway_workspace *new, const char *change) {
 	if (!ipc_has_event_listeners(IPC_EVENT_WORKSPACE)) {
 		return;
 	}
@@ -301,14 +302,14 @@ void ipc_event_workspace(struct sway_container *old,
 	json_object_object_add(obj, "change", json_object_new_string(change));
 	if (old) {
 		json_object_object_add(obj, "old",
-				ipc_json_describe_container_recursive(old));
+				ipc_json_describe_node_recursive(&old->node));
 	} else {
 		json_object_object_add(obj, "old", NULL);
 	}
 
 	if (new) {
 		json_object_object_add(obj, "current",
-				ipc_json_describe_container_recursive(new));
+				ipc_json_describe_node_recursive(&new->node));
 	} else {
 		json_object_object_add(obj, "current", NULL);
 	}
@@ -325,7 +326,8 @@ void ipc_event_window(struct sway_container *window, const char *change) {
 	wlr_log(WLR_DEBUG, "Sending window::%s event", change);
 	json_object *obj = json_object_new_object();
 	json_object_object_add(obj, "change", json_object_new_string(change));
-	json_object_object_add(obj, "container", ipc_json_describe_container_recursive(window));
+	json_object_object_add(obj, "container",
+			ipc_json_describe_node_recursive(&window->node));
 
 	const char *json_string = json_object_to_json_string(obj);
 	ipc_send_event(json_string, IPC_EVENT_WINDOW);
@@ -521,30 +523,20 @@ void ipc_client_disconnect(struct ipc_client *client) {
 	free(client);
 }
 
-static void ipc_get_workspaces_callback(struct sway_container *workspace,
+static void ipc_get_workspaces_callback(struct sway_workspace *workspace,
 		void *data) {
-	if (!sway_assert(workspace->type == C_WORKSPACE, "Expected a workspace")) {
+	json_object *workspace_json = ipc_json_describe_node(&workspace->node);
-		return;
-	}
-	json_object *workspace_json = ipc_json_describe_container(workspace);
 	// override the default focused indicator because
 	// it's set differently for the get_workspaces reply
-	struct sway_seat *seat =
+	struct sway_seat *seat = input_manager_get_default_seat(input_manager);
-		input_manager_get_default_seat(input_manager);
+	struct sway_workspace *focused_ws = seat_get_focused_workspace(seat);
-	struct sway_container *focused_ws = seat_get_focus(seat);
-	if (focused_ws != NULL && focused_ws->type != C_WORKSPACE) {
-		focused_ws = container_parent(focused_ws, C_WORKSPACE);
-	}
 	bool focused = workspace == focused_ws;
 	json_object_object_del(workspace_json, "focused");
 	json_object_object_add(workspace_json, "focused",
 			json_object_new_boolean(focused));
 	json_object_array_add((json_object *)data, workspace_json);
 
-	focused_ws = seat_get_focus_inactive(seat, workspace->parent);
+	focused_ws = output_get_active_workspace(workspace->output);
-	if (focused_ws->type != C_WORKSPACE) {
-		focused_ws = container_parent(focused_ws, C_WORKSPACE);
-	}
 	bool visible = workspace == focused_ws;
 	json_object_object_add(workspace_json, "visible",
 			json_object_new_boolean(visible));
@@ -552,9 +544,9 @@ static void ipc_get_workspaces_callback(struct sway_container *workspace,
 
 static void ipc_get_marks_callback(struct sway_container *con, void *data) {
 	json_object *marks = (json_object *)data;
-	if (con->type == C_VIEW && con->sway_view->marks) {
+	if (con->view && con->view->marks) {
-		for (int i = 0; i < con->sway_view->marks->length; ++i) {
+		for (int i = 0; i < con->view->marks->length; ++i) {
-			char *mark = (char *)con->sway_view->marks->items[i];
+			char *mark = (char *)con->view->marks->items[i];
 			json_object_array_add(marks, json_object_new_string(mark));
 		}
 	}
@@ -608,16 +600,14 @@ void ipc_client_handle_command(struct ipc_client *client) {
 	case IPC_GET_OUTPUTS:
 	{
 		json_object *outputs = json_object_new_array();
-		for (int i = 0; i < root_container.children->length; ++i) {
+		for (int i = 0; i < root->outputs->length; ++i) {
-			struct sway_container *container = root_container.children->items[i];
+			struct sway_output *output = root->outputs->items[i];
-			if (container->type == C_OUTPUT) {
+			json_object_array_add(outputs,
-				json_object_array_add(outputs,
+				ipc_json_describe_node(&output->node));
-					ipc_json_describe_container(container));
-			}
 		}
 		struct sway_output *output;
-		wl_list_for_each(output, &root_container.sway_root->all_outputs, link) {
+		wl_list_for_each(output, &root->all_outputs, link) {
-			if (!output->swayc) {
+			if (!output->enabled) {
 				json_object_array_add(outputs,
 						ipc_json_describe_disabled_output(output));
 			}
@@ -717,8 +707,7 @@ void ipc_client_handle_command(struct ipc_client *client) {
 
 	case IPC_GET_TREE:
 	{
-		json_object *tree =
+		json_object *tree = ipc_json_describe_node_recursive(&root->node);
-			ipc_json_describe_container_recursive(&root_container);
 		const char *json_string = json_object_to_json_string(tree);
 		client_valid =
 			ipc_send_reply(client, json_string, (uint32_t) strlen(json_string));

sway/main.c

@@ -42,7 +42,6 @@ void sway_terminate(int exit_code) {
 }
 
 void sig_handler(int signal) {
-	//close_views(&root_container);
 	sway_terminate(EXIT_SUCCESS);
 }
 
@@ -395,7 +394,7 @@ int main(int argc, char **argv) {
 
 	wlr_log(WLR_INFO, "Starting sway version " SWAY_VERSION);
 
-	root_create();
+	root = root_create();
 
 	if (!server_init(&server)) {
 		return 1;
@@ -450,7 +449,8 @@ int main(int argc, char **argv) {
 	wlr_log(WLR_INFO, "Shutting down sway");
 
 	server_fini(&server);
-	root_destroy();
+	root_destroy(root);
+	root = NULL;
 
 	if (config) {
 		free_config(config);

sway/meson.build

@@ -151,6 +151,7 @@ sway_sources = files(
 
 	'tree/arrange.c',
 	'tree/container.c',
+	'tree/node.c',
 	'tree/root.c',
 	'tree/view.c',
 	'tree/workspace.c',

sway/server.c

@@ -61,8 +61,7 @@ bool server_init(struct sway_server *server) {
 	server->new_output.notify = handle_new_output;
 	wl_signal_add(&server->backend->events.new_output, &server->new_output);
 
-	wlr_xdg_output_manager_create(server->wl_display,
+	wlr_xdg_output_manager_create(server->wl_display, root->output_layout);
-			root_container.sway_root->output_layout);
 
 	server->idle = wlr_idle_create(server->wl_display);
 	server->idle_inhibit_manager_v1 =
@@ -131,7 +130,7 @@ bool server_init(struct sway_server *server) {
 		server->txn_timeout_ms = 200;
 	}
 
-	server->dirty_containers = create_list();
+	server->dirty_nodes = create_list();
 	server->transactions = create_list();
 
 	input_manager = input_manager_create(server);
@@ -145,7 +144,7 @@ void server_fini(struct sway_server *server) {
 #endif
 	wl_display_destroy_clients(server->wl_display);
 	wl_display_destroy(server->wl_display);
-	list_free(server->dirty_containers);
+	list_free(server->dirty_nodes);
 	list_free(server->transactions);
 }
 

sway/tree/arrange.c

@@ -166,29 +166,23 @@ void arrange_container(struct sway_container *container) {
 	if (config->reloading) {
 		return;
 	}
-	if (container->type == C_VIEW) {
+	if (container->view) {
-		view_autoconfigure(container->sway_view);
+		view_autoconfigure(container->view);
-		container_set_dirty(container);
+		node_set_dirty(&container->node);
-		return;
-	}
-	if (!sway_assert(container->type == C_CONTAINER, "Expected a container")) {
 		return;
 	}
 	struct wlr_box box;
 	container_get_box(container, &box);
 	arrange_children(container->children, container->layout, &box);
-	container_set_dirty(container);
+	node_set_dirty(&container->node);
 }
 
-void arrange_workspace(struct sway_container *workspace) {
+void arrange_workspace(struct sway_workspace *workspace) {
 	if (config->reloading) {
 		return;
 	}
-	if (!sway_assert(workspace->type == C_WORKSPACE, "Expected a workspace")) {
+	struct sway_output *output = workspace->output;
-		return;
+	struct wlr_box *area = &output->usable_area;
-	}
-	struct sway_container *output = workspace->parent;
-	struct wlr_box *area = &output->sway_output->usable_area;
 	wlr_log(WLR_DEBUG, "Usable area for ws: %dx%d@%d,%d",
 			area->width, area->height, area->x, area->y);
 	workspace_remove_gaps(workspace);
@@ -197,21 +191,20 @@ void arrange_workspace(struct sway_container *workspace) {
 	double prev_y = workspace->y;
 	workspace->width = area->width;
 	workspace->height = area->height;
-	workspace->x = output->x + area->x;
+	workspace->x = output->wlr_output->lx + area->x;
-	workspace->y = output->y + area->y;
+	workspace->y = output->wlr_output->ly + area->y;
 
 	// Adjust any floating containers
 	double diff_x = workspace->x - prev_x;
 	double diff_y = workspace->y - prev_y;
 	if (diff_x != 0 || diff_y != 0) {
-		for (int i = 0; i < workspace->sway_workspace->floating->length; ++i) {
+		for (int i = 0; i < workspace->floating->length; ++i) {
-			struct sway_container *floater =
+			struct sway_container *floater = workspace->floating->items[i];
-				workspace->sway_workspace->floating->items[i];
 			container_floating_translate(floater, diff_x, diff_y);
 			double center_x = floater->x + floater->width / 2;
 			double center_y = floater->y + floater->height / 2;
 			struct wlr_box workspace_box;
-			container_get_box(workspace, &workspace_box);
+			workspace_get_box(workspace, &workspace_box);
 			if (!wlr_box_contains_point(&workspace_box, center_x, center_y)) {
 				container_floating_move_to_center(floater);
 			}
@@ -219,43 +212,37 @@ void arrange_workspace(struct sway_container *workspace) {
 	}
 
 	workspace_add_gaps(workspace);
-	container_set_dirty(workspace);
+	node_set_dirty(&workspace->node);
 	wlr_log(WLR_DEBUG, "Arranging workspace '%s' at %f, %f", workspace->name,
 			workspace->x, workspace->y);
-	if (workspace->sway_workspace->fullscreen) {
+	if (workspace->fullscreen) {
-		struct sway_container *fs = workspace->sway_workspace->fullscreen;
+		struct sway_container *fs = workspace->fullscreen;
-		fs->x = workspace->parent->x;
+		fs->x = output->lx;
-		fs->y = workspace->parent->y;
+		fs->y = output->ly;
-		fs->width = workspace->parent->width;
+		fs->width = output->width;
-		fs->height = workspace->parent->height;
+		fs->height = output->height;
 		arrange_container(fs);
 	} else {
 		struct wlr_box box;
-		container_get_box(workspace, &box);
+		workspace_get_box(workspace, &box);
-		arrange_children(workspace->children, workspace->layout, &box);
+		arrange_children(workspace->tiling, workspace->layout, &box);
-		arrange_floating(workspace->sway_workspace->floating);
+		arrange_floating(workspace->floating);
 	}
 }
 
-void arrange_output(struct sway_container *output) {
+void arrange_output(struct sway_output *output) {
 	if (config->reloading) {
 		return;
 	}
-	if (!sway_assert(output->type == C_OUTPUT, "Expected an output")) {
-		return;
-	}
 	const struct wlr_box *output_box = wlr_output_layout_get_box(
-			root_container.sway_root->output_layout,
+			root->output_layout, output->wlr_output);
-			output->sway_output->wlr_output);
+	output->lx = output_box->x;
-	output->x = output_box->x;
+	output->ly = output_box->y;
-	output->y = output_box->y;
 	output->width = output_box->width;
 	output->height = output_box->height;
-	container_set_dirty(output);
+
-	wlr_log(WLR_DEBUG, "Arranging output '%s' at %f,%f",
+	for (int i = 0; i < output->workspaces->length; ++i) {
-			output->name, output->x, output->y);
+		struct sway_workspace *workspace = output->workspaces->items[i];
-	for (int i = 0; i < output->children->length; ++i) {
-		struct sway_container *workspace = output->children->items[i];
 		arrange_workspace(workspace);
 	}
 }
@@ -264,37 +251,31 @@ void arrange_root(void) {
 	if (config->reloading) {
 		return;
 	}
-	struct wlr_output_layout *output_layout =
-		root_container.sway_root->output_layout;
 	const struct wlr_box *layout_box =
-		wlr_output_layout_get_box(output_layout, NULL);
+		wlr_output_layout_get_box(root->output_layout, NULL);
-	root_container.x = layout_box->x;
+	root->x = layout_box->x;
-	root_container.y = layout_box->y;
+	root->y = layout_box->y;
-	root_container.width = layout_box->width;
+	root->width = layout_box->width;
-	root_container.height = layout_box->height;
+	root->height = layout_box->height;
-	container_set_dirty(&root_container);
+	for (int i = 0; i < root->outputs->length; ++i) {
-	for (int i = 0; i < root_container.children->length; ++i) {
+		struct sway_output *output = root->outputs->items[i];
-		struct sway_container *output = root_container.children->items[i];
 		arrange_output(output);
 	}
 }
 
-void arrange_windows(struct sway_container *container) {
+void arrange_node(struct sway_node *node) {
-	switch (container->type) {
+	switch (node->type) {
-	case C_ROOT:
+	case N_ROOT:
 		arrange_root();
 		break;
-	case C_OUTPUT:
+	case N_OUTPUT:
-		arrange_output(container);
+		arrange_output(node->sway_output);
 		break;
-	case C_WORKSPACE:
+	case N_WORKSPACE:
-		arrange_workspace(container);
+		arrange_workspace(node->sway_workspace);
 		break;
-	case C_CONTAINER:
+	case N_CONTAINER:
-	case C_VIEW:
+		arrange_container(node->sway_container);
-		arrange_container(container);
-		break;
-	case C_TYPES:
 		break;
 	}
 }

sway/tree/node.c

@@ -0,0 +1,151 @@
+#define _POSIX_C_SOURCE 200809L
+#include "sway/output.h"
+#include "sway/server.h"
+#include "sway/tree/container.h"
+#include "sway/tree/node.h"
+#include "sway/tree/root.h"
+#include "sway/tree/workspace.h"
+#include "log.h"
+
+void node_init(struct sway_node *node, enum sway_node_type type, void *thing) {
+	static size_t next_id = 1;
+	node->id = next_id++;
+	node->type = type;
+	node->sway_root = thing;
+	wl_signal_init(&node->events.destroy);
+}
+
+const char *node_type_to_str(enum sway_node_type type) {
+	switch (type) {
+	case N_ROOT:
+		return "N_ROOT";
+	case N_OUTPUT:
+		return "N_OUTPUT";
+	case N_WORKSPACE:
+		return "N_WORKSPACE";
+	case N_CONTAINER:
+		return "N_CONTAINER";
+	}
+	return "";
+}
+
+void node_set_dirty(struct sway_node *node) {
+	if (node->dirty) {
+		return;
+	}
+	node->dirty = true;
+	list_add(server.dirty_nodes, node);
+}
+
+bool node_is_view(struct sway_node *node) {
+	return node->type == N_CONTAINER && node->sway_container->view;
+}
+
+char *node_get_name(struct sway_node *node) {
+	switch (node->type) {
+	case N_ROOT:
+		return "root";
+	case N_OUTPUT:
+		return node->sway_output->wlr_output->name;
+	case N_WORKSPACE:
+		return node->sway_workspace->name;
+	case N_CONTAINER:
+		return node->sway_container->title;
+	}
+	return NULL;
+}
+
+void node_get_box(struct sway_node *node, struct wlr_box *box) {
+	switch (node->type) {
+	case N_ROOT:
+		root_get_box(root, box);
+		break;
+	case N_OUTPUT:
+		output_get_box(node->sway_output, box);
+		break;
+	case N_WORKSPACE:
+		workspace_get_box(node->sway_workspace, box);
+		break;
+	case N_CONTAINER:
+		container_get_box(node->sway_container, box);
+		break;
+	}
+}
+
+struct sway_output *node_get_output(struct sway_node *node) {
+	switch (node->type) {
+	case N_CONTAINER:
+		return node->sway_container->workspace->output;
+	case N_WORKSPACE:
+		return node->sway_workspace->output;
+	case N_OUTPUT:
+		return node->sway_output;
+	case N_ROOT:
+		return NULL;
+	}
+	return NULL;
+}
+
+enum sway_container_layout node_get_layout(struct sway_node *node) {
+	switch (node->type) {
+	case N_CONTAINER:
+		return node->sway_container->layout;
+	case N_WORKSPACE:
+		return node->sway_workspace->layout;
+	case N_OUTPUT:
+	case N_ROOT:
+		return L_NONE;
+	}
+	return L_NONE;
+}
+
+struct sway_node *node_get_parent(struct sway_node *node) {
+	switch (node->type) {
+	case N_CONTAINER: {
+			struct sway_container *con = node->sway_container;
+			if (con->parent) {
+				return &con->parent->node;
+			}
+			if (con->workspace) {
+				return &con->workspace->node;
+			}
+		}
+		return NULL;
+	case N_WORKSPACE: {
+			struct sway_workspace *ws = node->sway_workspace;
+			if (ws->output) {
+				return &ws->output->node;
+			}
+		}
+		return NULL;
+	case N_OUTPUT:
+		return &root->node;
+	case N_ROOT:
+		return NULL;
+	}
+	return NULL;
+}
+
+list_t *node_get_children(struct sway_node *node) {
+	switch (node->type) {
+	case N_CONTAINER:
+		return node->sway_container->children;
+	case N_WORKSPACE:
+		return node->sway_workspace->tiling;
+	case N_OUTPUT:
+	case N_ROOT:
+		return NULL;
+	}
+	return NULL;
+}
+
+bool node_has_ancestor(struct sway_node *node, struct sway_node *ancestor) {
+	struct sway_node *parent = node_get_parent(node);
+	while (parent) {
+		if (parent == ancestor) {
+			return true;
+		}
+		parent = node_get_parent(parent);
+	}
+	return false;
+}

sway/tree/output.c

@@ -2,28 +2,31 @@
 #include <ctype.h>
 #include <string.h>
 #include <strings.h>
+#include <wlr/types/wlr_output_damage.h>
 #include "sway/ipc-server.h"
+#include "sway/layers.h"
 #include "sway/output.h"
 #include "sway/tree/arrange.h"
 #include "sway/tree/output.h"
 #include "sway/tree/workspace.h"
 #include "log.h"
+#include "util.h"
 
-static void restore_workspaces(struct sway_container *output) {
+static void restore_workspaces(struct sway_output *output) {
 	// Workspace output priority
-	for (int i = 0; i < root_container.children->length; i++) {
+	for (int i = 0; i < root->outputs->length; i++) {
-		struct sway_container *other = root_container.children->items[i];
+		struct sway_output *other = root->outputs->items[i];
 		if (other == output) {
 			continue;
 		}
 
-		for (int j = 0; j < other->children->length; j++) {
+		for (int j = 0; j < other->workspaces->length; j++) {
-			struct sway_container *ws = other->children->items[j];
+			struct sway_workspace *ws = other->workspaces->items[j];
-			struct sway_container *highest =
+			struct sway_output *highest =
 				workspace_output_get_highest_available(ws, NULL);
 			if (highest == output) {
-				container_remove_child(ws);
+				workspace_detach(ws);
-				container_add_child(output, ws);
+				output_add_workspace(output, ws);
 				ipc_event_workspace(NULL, ws, "move");
 				j--;
 			}
@@ -31,22 +34,202 @@ static void restore_workspaces(struct sway_container *output) {
 	}
 
 	// Saved workspaces
-	list_t *saved = root_container.sway_root->saved_workspaces;
+	for (int i = 0; i < root->saved_workspaces->length; ++i) {
-	for (int i = 0; i < saved->length; ++i) {
+		struct sway_workspace *ws = root->saved_workspaces->items[i];
-		struct sway_container *ws = saved->items[i];
+		output_add_workspace(output, ws);
-		container_add_child(output, ws);
 		ipc_event_workspace(NULL, ws, "move");
 	}
-	saved->length = 0;
+	root->saved_workspaces->length = 0;
 
 	output_sort_workspaces(output);
 }
 
-struct sway_container *output_create(
+struct sway_output *output_create(struct wlr_output *wlr_output) {
-		struct sway_output *sway_output) {
+	struct sway_output *output = calloc(1, sizeof(struct sway_output));
-	const char *name = sway_output->wlr_output->name;
+	node_init(&output->node, N_OUTPUT, output);
+	output->wlr_output = wlr_output;
+	wlr_output->data = output;
+
+	wl_signal_add(&wlr_output->events.destroy, &output->destroy);
+
+	wl_list_insert(&root->all_outputs, &output->link);
+
+	if (!wl_list_empty(&wlr_output->modes)) {
+		struct wlr_output_mode *mode =
+			wl_container_of(wlr_output->modes.prev, mode, link);
+		wlr_output_set_mode(wlr_output, mode);
+	}
+
+	output->workspaces = create_list();
+	output->current.workspaces = create_list();
+
+	return output;
+}
+
+void output_enable(struct sway_output *output, struct output_config *oc) {
+	if (!sway_assert(!output->enabled, "output is already enabled")) {
+		return;
+	}
+	struct wlr_output *wlr_output = output->wlr_output;
+	output->enabled = true;
+	apply_output_config(oc, output);
+	list_add(root->outputs, output);
+
+	output->lx = wlr_output->lx;
+	output->ly = wlr_output->ly;
+	wlr_output_transformed_resolution(wlr_output,
+			&output->width, &output->height);
+
+	restore_workspaces(output);
+
+	if (!output->workspaces->length) {
+		// Create workspace
+		char *ws_name = workspace_next_name(wlr_output->name);
+		wlr_log(WLR_DEBUG, "Creating default workspace %s", ws_name);
+		struct sway_workspace *ws = workspace_create(output, ws_name);
+		// Set each seat's focus if not already set
+		struct sway_seat *seat = NULL;
+		wl_list_for_each(seat, &input_manager->seats, link) {
+			if (!seat->has_focus) {
+				seat_set_focus(seat, &ws->node);
+			}
+		}
+		free(ws_name);
+	}
+
+	size_t len = sizeof(output->layers) / sizeof(output->layers[0]);
+	for (size_t i = 0; i < len; ++i) {
+		wl_list_init(&output->layers[i]);
+	}
+	wl_signal_init(&output->events.destroy);
+
+	input_manager_configure_xcursor(input_manager);
+
+	wl_signal_add(&wlr_output->events.mode, &output->mode);
+	wl_signal_add(&wlr_output->events.transform, &output->transform);
+	wl_signal_add(&wlr_output->events.scale, &output->scale);
+	wl_signal_add(&output->damage->events.frame, &output->damage_frame);
+	wl_signal_add(&output->damage->events.destroy, &output->damage_destroy);
+
+	output_add_listeners(output);
+
+	wl_signal_emit(&root->events.new_node, &output->node);
+
+	load_swaybars();
+
+	arrange_layers(output);
+	arrange_root();
+}
+
+static void output_evacuate(struct sway_output *output) {
+	if (!output->workspaces->length) {
+		return;
+	}
+	struct sway_output *fallback_output = NULL;
+	if (root->outputs->length > 1) {
+		fallback_output = root->outputs->items[0];
+		if (fallback_output == output) {
+			fallback_output = root->outputs->items[1];
+		}
+	}
+
+	while (output->workspaces->length) {
+		struct sway_workspace *workspace = output->workspaces->items[0];
+
+		workspace_detach(workspace);
+
+		if (workspace_is_empty(workspace)) {
+			workspace_begin_destroy(workspace);
+			continue;
+		}
+
+		struct sway_output *new_output =
+			workspace_output_get_highest_available(workspace, output);
+		if (!new_output) {
+			new_output = fallback_output;
+		}
+
+		if (new_output) {
+			workspace_output_add_priority(workspace, new_output);
+			output_add_workspace(new_output, workspace);
+			output_sort_workspaces(new_output);
+			ipc_event_workspace(NULL, workspace, "move");
+		} else {
+			list_add(root->saved_workspaces, workspace);
+		}
+	}
+}
+
+void output_destroy(struct sway_output *output) {
+	if (!sway_assert(output->node.destroying,
+				"Tried to free output which wasn't marked as destroying")) {
+		return;
+	}
+	if (!sway_assert(output->wlr_output == NULL,
+				"Tried to free output which still had a wlr_output")) {
+		return;
+	}
+	if (!sway_assert(output->node.ntxnrefs == 0, "Tried to free output "
+				"which is still referenced by transactions")) {
+		return;
+	}
+	list_free(output->workspaces);
+	list_free(output->current.workspaces);
+	free(output);
+}
+
+static void untrack_output(struct sway_container *con, void *data) {
+	struct sway_output *output = data;
+	int index = list_find(con->outputs, output);
+	if (index != -1) {
+		list_del(con->outputs, index);
+	}
+}
+
+void output_disable(struct sway_output *output) {
+	if (!sway_assert(output->enabled, "Expected an enabled output")) {
+		return;
+	}
+	wlr_log(WLR_DEBUG, "Disabling output '%s'", output->wlr_output->name);
+	wl_signal_emit(&output->events.destroy, output);
+
+	output_evacuate(output);
+
+	root_for_each_container(untrack_output, output);
+
+	int index = list_find(root->outputs, output);
+	list_del(root->outputs, index);
+
+	wl_list_remove(&output->mode.link);
+	wl_list_remove(&output->transform.link);
+	wl_list_remove(&output->scale.link);
+	wl_list_remove(&output->damage_destroy.link);
+	wl_list_remove(&output->damage_frame.link);
+
+	output->enabled = false;
+
+	arrange_root();
+}
+
+void output_begin_destroy(struct sway_output *output) {
+	if (!sway_assert(!output->enabled, "Expected a disabled output")) {
+		return;
+	}
+	wlr_log(WLR_DEBUG, "Destroying output '%s'", output->wlr_output->name);
+
+	output->node.destroying = true;
+	node_set_dirty(&output->node);
+
+	wl_list_remove(&output->link);
+	wl_list_remove(&output->destroy.link);
+	output->wlr_output->data = NULL;
+	output->wlr_output = NULL;
+}
+
+struct output_config *output_find_config(struct sway_output *output) {
+	const char *name = output->wlr_output->name;
 	char identifier[128];
-	output_get_identifier(identifier, sizeof(identifier), sway_output);
+	output_get_identifier(identifier, sizeof(identifier), output);
 
 	struct output_config *oc = NULL, *all = NULL;
 	for (int i = 0; i < config->output_configs->length; ++i) {
@@ -70,192 +253,61 @@ struct sway_container *output_create(
 		oc = all;
 	}
 
-	if (oc && !oc->enabled) {
+	return oc;
+}
+
+struct sway_output *output_from_wlr_output(struct wlr_output *output) {
+	return output->data;
+}
+
+struct sway_output *output_get_in_direction(struct sway_output *reference,
+		enum movement_direction direction) {
+	enum wlr_direction wlr_dir = 0;
+	if (!sway_assert(sway_dir_to_wlr(direction, &wlr_dir),
+				"got invalid direction: %d", direction)) {
 		return NULL;
 	}
-
+	int lx = reference->wlr_output->lx + reference->width / 2;
-	struct sway_container *output = container_create(C_OUTPUT);
+	int ly = reference->wlr_output->ly + reference->height / 2;
-	output->sway_output = sway_output;
+	struct wlr_output *wlr_adjacent = wlr_output_layout_adjacent_output(
-	output->name = strdup(name);
+			root->output_layout, wlr_dir, reference->wlr_output, lx, ly);
-	if (output->name == NULL) {
+	if (!wlr_adjacent) {
-		output_begin_destroy(output);
 		return NULL;
 	}
-
+	return output_from_wlr_output(wlr_adjacent);
-	apply_output_config(oc, output);
-	container_add_child(&root_container, output);
-	load_swaybars();
-
-	struct wlr_box size;
-	wlr_output_effective_resolution(sway_output->wlr_output, &size.width,
-		&size.height);
-	output->width = size.width;
-	output->height = size.height;
-
-	restore_workspaces(output);
-
-	if (!output->children->length) {
-		// Create workspace
-		char *ws_name = workspace_next_name(output->name);
-		wlr_log(WLR_DEBUG, "Creating default workspace %s", ws_name);
-		struct sway_container *ws = workspace_create(output, ws_name);
-		// Set each seat's focus if not already set
-		struct sway_seat *seat = NULL;
-		wl_list_for_each(seat, &input_manager->seats, link) {
-			if (!seat->has_focus) {
-				seat_set_focus(seat, ws);
-			}
-		}
-		free(ws_name);
-	}
-
-	container_create_notify(output);
-	return output;
 }
 
-static void output_evacuate(struct sway_container *output) {
+void output_add_workspace(struct sway_output *output,
-	if (!output->children->length) {
+		struct sway_workspace *workspace) {
-		return;
+	if (workspace->output) {
-	}
+		workspace_detach(workspace);
-	struct sway_container *fallback_output = NULL;
-	if (root_container.children->length > 1) {
-		fallback_output = root_container.children->items[0];
-		if (fallback_output == output) {
-			fallback_output = root_container.children->items[1];
-		}
-	}
-
-	while (output->children->length) {
-		struct sway_container *workspace = output->children->items[0];
-
-		container_remove_child(workspace);
-
-		if (workspace_is_empty(workspace)) {
-			workspace_begin_destroy(workspace);
-			continue;
-		}
-
-		struct sway_container *new_output =
-			workspace_output_get_highest_available(workspace, output);
-		if (!new_output) {
-			new_output = fallback_output;
-		}
-
-		if (new_output) {
-			workspace_output_add_priority(workspace, new_output);
-			container_add_child(new_output, workspace);
-			output_sort_workspaces(new_output);
-			ipc_event_workspace(NULL, workspace, "move");
-		} else {
-			list_add(root_container.sway_root->saved_workspaces, workspace);
-		}
 	}
+	list_add(output->workspaces, workspace);
+	workspace->output = output;
+	node_set_dirty(&output->node);
+	node_set_dirty(&workspace->node);
 }
 
-void output_destroy(struct sway_container *output) {
+void output_for_each_workspace(struct sway_output *output,
-	if (!sway_assert(output->type == C_OUTPUT, "Expected an output")) {
+		void (*f)(struct sway_workspace *ws, void *data), void *data) {
-		return;
+	for (int i = 0; i < output->workspaces->length; ++i) {
-	}
+		struct sway_workspace *workspace = output->workspaces->items[i];
-	if (!sway_assert(output->destroying,
-				"Tried to free output which wasn't marked as destroying")) {
-		return;
-	}
-	if (!sway_assert(output->ntxnrefs == 0, "Tried to free output "
-				"which is still referenced by transactions")) {
-		return;
-	}
-	free(output->name);
-	free(output->formatted_title);
-	wlr_texture_destroy(output->title_focused);
-	wlr_texture_destroy(output->title_focused_inactive);
-	wlr_texture_destroy(output->title_unfocused);
-	wlr_texture_destroy(output->title_urgent);
-	list_free(output->children);
-	list_free(output->current.children);
-	list_free(output->outputs);
-	free(output);
-
-	// NOTE: We don't actually destroy the sway_output here
-}
-
-static void untrack_output(struct sway_container *con, void *data) {
-	struct sway_output *output = data;
-	int index = list_find(con->outputs, output);
-	if (index != -1) {
-		list_del(con->outputs, index);
-	}
-}
-
-void output_begin_destroy(struct sway_container *output) {
-	if (!sway_assert(output->type == C_OUTPUT, "Expected an output")) {
-		return;
-	}
-	wlr_log(WLR_DEBUG, "OUTPUT: Destroying output '%s'", output->name);
-	wl_signal_emit(&output->events.destroy, output);
-
-	output_evacuate(output);
-
-	output->destroying = true;
-	container_set_dirty(output);
-
-	root_for_each_container(untrack_output, output->sway_output);
-
-	wl_list_remove(&output->sway_output->mode.link);
-	wl_list_remove(&output->sway_output->transform.link);
-	wl_list_remove(&output->sway_output->scale.link);
-	wl_list_remove(&output->sway_output->damage_destroy.link);
-	wl_list_remove(&output->sway_output->damage_frame.link);
-
-	output->sway_output->swayc = NULL;
-	output->sway_output = NULL;
-
-	if (output->parent) {
-		container_remove_child(output);
-	}
-}
-
-struct sway_container *output_from_wlr_output(struct wlr_output *output) {
-	if (output == NULL) {
-		return NULL;
-	}
-	for (int i = 0; i < root_container.children->length; ++i) {
-		struct sway_container *o = root_container.children->items[i];
-		if (o->type == C_OUTPUT && o->sway_output->wlr_output == output) {
-			return o;
-		}
-	}
-	return NULL;
-}
-
-void output_for_each_workspace(struct sway_container *output,
-		void (*f)(struct sway_container *con, void *data), void *data) {
-	if (!sway_assert(output->type == C_OUTPUT, "Expected an output")) {
-		return;
-	}
-	for (int i = 0; i < output->children->length; ++i) {
-		struct sway_container *workspace = output->children->items[i];
 		f(workspace, data);
 	}
 }
 
-void output_for_each_container(struct sway_container *output,
+void output_for_each_container(struct sway_output *output,
 		void (*f)(struct sway_container *con, void *data), void *data) {
-	if (!sway_assert(output->type == C_OUTPUT, "Expected an output")) {
+	for (int i = 0; i < output->workspaces->length; ++i) {
-		return;
+		struct sway_workspace *workspace = output->workspaces->items[i];
-	}
-	for (int i = 0; i < output->children->length; ++i) {
-		struct sway_container *workspace = output->children->items[i];
 		workspace_for_each_container(workspace, f, data);
 	}
 }
 
-struct sway_container *output_find_workspace(struct sway_container *output,
+struct sway_workspace *output_find_workspace(struct sway_output *output,
-		bool (*test)(struct sway_container *con, void *data), void *data) {
+		bool (*test)(struct sway_workspace *ws, void *data), void *data) {
-	if (!sway_assert(output->type == C_OUTPUT, "Expected an output")) {
+	for (int i = 0; i < output->workspaces->length; ++i) {
-		return NULL;
+		struct sway_workspace *workspace = output->workspaces->items[i];
-	}
-	for (int i = 0; i < output->children->length; ++i) {
-		struct sway_container *workspace = output->children->items[i];
 		if (test(workspace, data)) {
 			return workspace;
 		}
@@ -263,14 +315,11 @@ struct sway_container *output_find_workspace(struct sway_container *output,
 	return NULL;
 }
 
-struct sway_container *output_find_container(struct sway_container *output,
+struct sway_container *output_find_container(struct sway_output *output,
 		bool (*test)(struct sway_container *con, void *data), void *data) {
-	if (!sway_assert(output->type == C_OUTPUT, "Expected an output")) {
-		return NULL;
-	}
 	struct sway_container *result = NULL;
-	for (int i = 0; i < output->children->length; ++i) {
+	for (int i = 0; i < output->workspaces->length; ++i) {
-		struct sway_container *workspace = output->children->items[i];
+		struct sway_workspace *workspace = output->workspaces->items[i];
 		if ((result = workspace_find_container(workspace, test, data))) {
 			return result;
 		}
@@ -279,8 +328,8 @@ struct sway_container *output_find_container(struct sway_container *output,
 }
 
 static int sort_workspace_cmp_qsort(const void *_a, const void *_b) {
-	struct sway_container *a = *(void **)_a;
+	struct sway_workspace *a = *(void **)_a;
-	struct sway_container *b = *(void **)_b;
+	struct sway_workspace *b = *(void **)_b;
 
 	if (isdigit(a->name[0]) && isdigit(b->name[0])) {
 		int a_num = strtol(a->name, NULL, 10);
@@ -294,6 +343,27 @@ static int sort_workspace_cmp_qsort(const void *_a, const void *_b) {
 	return 0;
 }
 
-void output_sort_workspaces(struct sway_container *output) {
+void output_sort_workspaces(struct sway_output *output) {
-	list_stable_sort(output->children, sort_workspace_cmp_qsort);
+	list_stable_sort(output->workspaces, sort_workspace_cmp_qsort);
+}
+
+void output_get_box(struct sway_output *output, struct wlr_box *box) {
+	box->x = output->lx;
+	box->y = output->ly;
+	box->width = output->width;
+	box->height = output->height;
+}
+
+enum sway_container_layout output_get_default_layout(
+		struct sway_output *output) {
+	if (config->default_layout != L_NONE) {
+		return config->default_layout;
+	}
+	if (config->default_orientation != L_NONE) {
+		return config->default_orientation;
+	}
+	if (output->height > output->width) {
+		return L_VERT;
+	}
+	return L_HORIZ;
 }

sway/tree/root.c

@@ -14,54 +14,45 @@
 #include "log.h"
 #include "util.h"
 
-struct sway_container root_container;
+struct sway_root *root;
 
 static void output_layout_handle_change(struct wl_listener *listener,
 		void *data) {
-	arrange_windows(&root_container);
+	arrange_root();
 	transaction_commit_dirty();
 }
 
-void root_create(void) {
+struct sway_root *root_create(void) {
-	root_container.id = 0; // normally assigned in new_swayc()
+	struct sway_root *root = calloc(1, sizeof(struct sway_root));
-	root_container.type = C_ROOT;
+	if (!root) {
-	root_container.layout = L_NONE;
+		wlr_log(WLR_ERROR, "Unable to allocate sway_root");
-	root_container.name = strdup("root");
+		return NULL;
-	root_container.children = create_list();
+	}
-	root_container.current.children = create_list();
+	node_init(&root->node, N_ROOT, root);
-	wl_signal_init(&root_container.events.destroy);
+	root->output_layout = wlr_output_layout_create();
-
+	wl_list_init(&root->all_outputs);
-	root_container.sway_root = calloc(1, sizeof(*root_container.sway_root));
-	root_container.sway_root->output_layout = wlr_output_layout_create();
-	wl_list_init(&root_container.sway_root->all_outputs);
 #ifdef HAVE_XWAYLAND
-	wl_list_init(&root_container.sway_root->xwayland_unmanaged);
+	wl_list_init(&root->xwayland_unmanaged);
 #endif
-	wl_list_init(&root_container.sway_root->drag_icons);
+	wl_list_init(&root->drag_icons);
-	wl_signal_init(&root_container.sway_root->events.new_container);
+	wl_signal_init(&root->events.new_node);
-	root_container.sway_root->scratchpad = create_list();
+	root->outputs = create_list();
-	root_container.sway_root->saved_workspaces = create_list();
+	root->scratchpad = create_list();
+	root->saved_workspaces = create_list();
 
-	root_container.sway_root->output_layout_change.notify =
+	root->output_layout_change.notify = output_layout_handle_change;
-		output_layout_handle_change;
+	wl_signal_add(&root->output_layout->events.change,
-	wl_signal_add(&root_container.sway_root->output_layout->events.change,
+		&root->output_layout_change);
-		&root_container.sway_root->output_layout_change);
+	return root;
 }
 
-void root_destroy(void) {
+void root_destroy(struct sway_root *root) {
-	// sway_root
+	wl_list_remove(&root->output_layout_change.link);
-	wl_list_remove(&root_container.sway_root->output_layout_change.link);
+	list_free(root->scratchpad);
-	list_free(root_container.sway_root->scratchpad);
+	list_free(root->saved_workspaces);
-	list_free(root_container.sway_root->saved_workspaces);
+	list_free(root->outputs);
-	wlr_output_layout_destroy(root_container.sway_root->output_layout);
+	wlr_output_layout_destroy(root->output_layout);
-	free(root_container.sway_root);
+	free(root);
-
-	// root_container
-	list_free(root_container.children);
-	list_free(root_container.current.children);
-	free(root_container.name);
-
-	memset(&root_container, 0, sizeof(root_container));
 }
 
 void root_scratchpad_add_container(struct sway_container *con) {
@@ -69,15 +60,21 @@ void root_scratchpad_add_container(struct sway_container *con) {
 		return;
 	}
 	con->scratchpad = true;
-	list_add(root_container.sway_root->scratchpad, con);
+	list_add(root->scratchpad, con);
 
 	struct sway_container *parent = con->parent;
+	struct sway_workspace *workspace = con->workspace;
 	container_set_floating(con, true);
-	container_remove_child(con);
+	container_detach(con);
-	arrange_windows(parent);
 
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	seat_set_focus(seat, seat_get_focus_inactive(seat, parent));
+	if (parent) {
+		arrange_container(parent);
+		seat_set_focus(seat, seat_get_focus_inactive(seat, &parent->node));
+	} else {
+		arrange_workspace(workspace);
+		seat_set_focus(seat, seat_get_focus_inactive(seat, &workspace->node));
+	}
 }
 
 void root_scratchpad_remove_container(struct sway_container *con) {
@@ -85,28 +82,25 @@ void root_scratchpad_remove_container(struct sway_container *con) {
 		return;
 	}
 	con->scratchpad = false;
-	int index = list_find(root_container.sway_root->scratchpad, con);
+	int index = list_find(root->scratchpad, con);
 	if (index != -1) {
-		list_del(root_container.sway_root->scratchpad, index);
+		list_del(root->scratchpad, index);
 	}
 }
 
 void root_scratchpad_show(struct sway_container *con) {
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *ws = seat_get_focus(seat);
+	struct sway_workspace *ws = seat_get_focused_workspace(seat);
-	if (ws->type != C_WORKSPACE) {
-		ws = container_parent(ws, C_WORKSPACE);
-	}
 
     // If the current con or any of its parents are in fullscreen mode, we
     // first need to disable it before showing the scratchpad con.
-	if (ws->sway_workspace->fullscreen) {
+	if (ws->fullscreen) {
-		container_set_fullscreen(ws->sway_workspace->fullscreen, false);
+		container_set_fullscreen(ws->fullscreen, false);
 	}
 
 	// Show the container
-	if (con->parent) {
+	if (con->workspace) {
-		container_remove_child(con);
+		container_detach(con);
 	}
 	workspace_add_floating(ws, con);
 
@@ -115,7 +109,7 @@ void root_scratchpad_show(struct sway_container *con) {
 	double center_ly = con->y + con->height / 2;
 
 	struct wlr_box workspace_box;
-	container_get_box(ws, &workspace_box);
+	workspace_get_box(ws, &workspace_box);
 	if (!wlr_box_contains_point(&workspace_box, center_lx, center_ly)) {
 		// Maybe resize it
 		if (con->width > ws->width || con->height > ws->height) {
@@ -128,23 +122,21 @@ void root_scratchpad_show(struct sway_container *con) {
 		container_floating_move_to(con, new_lx, new_ly);
 	}
 
-	arrange_windows(ws);
+	arrange_workspace(ws);
-	seat_set_focus(seat, seat_get_focus_inactive(seat, con));
+	seat_set_focus(seat, seat_get_focus_inactive(seat, &con->node));
-
-	container_set_dirty(con->parent);
 }
 
 void root_scratchpad_hide(struct sway_container *con) {
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *focus = seat_get_focus(seat);
+	struct sway_node *focus = seat_get_focus(seat);
-	struct sway_container *ws = container_parent(con, C_WORKSPACE);
+	struct sway_workspace *ws = con->workspace;
 
-	container_remove_child(con);
+	container_detach(con);
-	arrange_windows(ws);
+	arrange_workspace(ws);
-	if (con == focus) {
+	if (&con->node == focus) {
-		seat_set_focus(seat, seat_get_focus_inactive(seat, ws));
+		seat_set_focus(seat, seat_get_focus_inactive(seat, &ws->node));
 	}
-	list_move_to_end(root_container.sway_root->scratchpad, con);
+	list_move_to_end(root->scratchpad, con);
 }
 
 struct pid_workspace {
@@ -152,7 +144,7 @@ struct pid_workspace {
 	char *workspace;
 	struct timespec time_added;
 
-	struct sway_container *output;
+	struct sway_output *output;
 	struct wl_listener output_destroy;
 
 	struct wl_list link;
@@ -160,13 +152,13 @@ struct pid_workspace {
 
 static struct wl_list pid_workspaces;
 
-struct sway_container *root_workspace_for_pid(pid_t pid) {
+struct sway_workspace *root_workspace_for_pid(pid_t pid) {
 	if (!pid_workspaces.prev && !pid_workspaces.next) {
 		wl_list_init(&pid_workspaces);
 		return NULL;
 	}
 
-	struct sway_container *ws = NULL;
+	struct sway_workspace *ws = NULL;
 	struct pid_workspace *pw = NULL;
 
 	wlr_log(WLR_DEBUG, "Looking up workspace for pid %d", pid);
@@ -219,16 +211,12 @@ void root_record_workspace_pid(pid_t pid) {
 	}
 
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *ws =
+	struct sway_workspace *ws = seat_get_focused_workspace(seat);
-		seat_get_focus_inactive(seat, &root_container);
-	if (ws && ws->type != C_WORKSPACE) {
-		ws = container_parent(ws, C_WORKSPACE);
-	}
 	if (!ws) {
 		wlr_log(WLR_DEBUG, "Bailing out, no workspace");
 		return;
 	}
-	struct sway_container *output = ws->parent;
+	struct sway_output *output = ws->output;
 	if (!output) {
 		wlr_log(WLR_DEBUG, "Bailing out, no output");
 		return;
@@ -255,30 +243,28 @@ void root_record_workspace_pid(pid_t pid) {
 	pw->pid = pid;
 	memcpy(&pw->time_added, &now, sizeof(struct timespec));
 	pw->output_destroy.notify = pw_handle_output_destroy;
-	wl_signal_add(&output->sway_output->wlr_output->events.destroy,
+	wl_signal_add(&output->wlr_output->events.destroy, &pw->output_destroy);
-			&pw->output_destroy);
 	wl_list_insert(&pid_workspaces, &pw->link);
 }
 
-void root_for_each_workspace(void (*f)(struct sway_container *con, void *data),
+void root_for_each_workspace(void (*f)(struct sway_workspace *ws, void *data),
 		void *data) {
-	for (int i = 0; i < root_container.children->length; ++i) {
+	for (int i = 0; i < root->outputs->length; ++i) {
-		struct sway_container *output = root_container.children->items[i];
+		struct sway_output *output = root->outputs->items[i];
 		output_for_each_workspace(output, f, data);
 	}
 }
 
 void root_for_each_container(void (*f)(struct sway_container *con, void *data),
 		void *data) {
-	for (int i = 0; i < root_container.children->length; ++i) {
+	for (int i = 0; i < root->outputs->length; ++i) {
-		struct sway_container *output = root_container.children->items[i];
+		struct sway_output *output = root->outputs->items[i];
 		output_for_each_container(output, f, data);
 	}
 
 	// Scratchpad
-	for (int i = 0; i < root_container.sway_root->scratchpad->length; ++i) {
+	for (int i = 0; i < root->scratchpad->length; ++i) {
-		struct sway_container *container =
+		struct sway_container *container = root->scratchpad->items[i];
-			root_container.sway_root->scratchpad->items[i];
 		// If the container has a parent then it's visible on a workspace
 		// and will have been iterated in the previous for loop. So we only
 		// iterate the hidden scratchpad containers here.
@@ -289,10 +275,10 @@ void root_for_each_container(void (*f)(struct sway_container *con, void *data),
 	}
 }
 
-struct sway_container *root_find_output(
+struct sway_output *root_find_output(
-		bool (*test)(struct sway_container *con, void *data), void *data) {
+		bool (*test)(struct sway_output *output, void *data), void *data) {
-	for (int i = 0; i < root_container.children->length; ++i) {
+	for (int i = 0; i < root->outputs->length; ++i) {
-		struct sway_container *output = root_container.children->items[i];
+		struct sway_output *output = root->outputs->items[i];
 		if (test(output, data)) {
 			return output;
 		}
@@ -300,11 +286,11 @@ struct sway_container *root_find_output(
 	return NULL;
 }
 
-struct sway_container *root_find_workspace(
+struct sway_workspace *root_find_workspace(
-		bool (*test)(struct sway_container *con, void *data), void *data) {
+		bool (*test)(struct sway_workspace *ws, void *data), void *data) {
-	struct sway_container *result = NULL;
+	struct sway_workspace *result = NULL;
-	for (int i = 0; i < root_container.children->length; ++i) {
+	for (int i = 0; i < root->outputs->length; ++i) {
-		struct sway_container *output = root_container.children->items[i];
+		struct sway_output *output = root->outputs->items[i];
 		if ((result = output_find_workspace(output, test, data))) {
 			return result;
 		}
@@ -315,17 +301,16 @@ struct sway_container *root_find_workspace(
 struct sway_container *root_find_container(
 		bool (*test)(struct sway_container *con, void *data), void *data) {
 	struct sway_container *result = NULL;
-	for (int i = 0; i < root_container.children->length; ++i) {
+	for (int i = 0; i < root->outputs->length; ++i) {
-		struct sway_container *output = root_container.children->items[i];
+		struct sway_output *output = root->outputs->items[i];
 		if ((result = output_find_container(output, test, data))) {
 			return result;
 		}
 	}
 
 	// Scratchpad
-	for (int i = 0; i < root_container.sway_root->scratchpad->length; ++i) {
+	for (int i = 0; i < root->scratchpad->length; ++i) {
-		struct sway_container *container =
+		struct sway_container *container = root->scratchpad->items[i];
-			root_container.sway_root->scratchpad->items[i];
 		if (!container->parent) {
 			if (test(container, data)) {
 				return container;
@@ -337,3 +322,10 @@ struct sway_container *root_find_container(
 	}
 	return NULL;
 }
+
+void root_get_box(struct sway_root *root, struct wlr_box *box) {
+	box->x = root->x;
+	box->y = root->y;
+	box->width = root->width;
+	box->height = root->height;
+}

sway/tree/view.c

@@ -33,6 +33,8 @@ void view_init(struct sway_view *view, enum sway_view_type type,
 	view->marks = create_list();
 	view->allow_request_urgent = true;
 	wl_signal_init(&view->events.unmap);
+
+	view->container = container_create(view);
 }
 
 void view_destroy(struct sway_view *view) {
@@ -43,8 +45,8 @@ void view_destroy(struct sway_view *view) {
 				"Tried to free view which wasn't marked as destroying")) {
 		return;
 	}
-	if (!sway_assert(view->swayc == NULL,
+	if (!sway_assert(view->container == NULL,
-				"Tried to free view which still has a swayc "
+				"Tried to free view which still has a container "
 				"(might have a pending transaction?)")) {
 		return;
 	}
@@ -57,6 +59,7 @@ void view_destroy(struct sway_view *view) {
 	wlr_texture_destroy(view->marks_focused_inactive);
 	wlr_texture_destroy(view->marks_unfocused);
 	wlr_texture_destroy(view->marks_urgent);
+	free(view->title_format);
 
 	if (view->impl->destroy) {
 		view->impl->destroy(view);
@@ -65,23 +68,13 @@ void view_destroy(struct sway_view *view) {
 	}
 }
 
-/**
- * The view may or may not be involved in a transaction. For example, a view may
- * unmap then attempt to destroy itself before we've applied the new layout. If
- * an unmapping view is still involved in a transaction then it'll still have a
- * swayc.
- *
- * If there's no transaction we can simply free the view. Otherwise the
- * destroying flag will make the view get freed when the transaction is
- * finished.
- */
 void view_begin_destroy(struct sway_view *view) {
 	if (!sway_assert(view->surface == NULL, "Tried to destroy a mapped view")) {
 		return;
 	}
 	view->destroying = true;
 
-	if (!view->swayc) {
+	if (!view->container) {
 		view_destroy(view);
 	}
 }
@@ -171,30 +164,31 @@ uint32_t view_configure(struct sway_view *view, double lx, double ly, int width,
 }
 
 void view_autoconfigure(struct sway_view *view) {
-	if (!sway_assert(view->swayc,
+	if (!view->container->workspace) {
-				"Called view_autoconfigure() on a view without a swayc")) {
+		// Hidden in the scratchpad
 		return;
 	}
+	struct sway_output *output = view->container->workspace->output;
 
-	struct sway_container *output = container_parent(view->swayc, C_OUTPUT);
+	if (view->container->is_fullscreen) {
-
+		view->x = output->lx;
-	if (view->swayc->is_fullscreen) {
+		view->y = output->ly;
-		view->x = output->x;
-		view->y = output->y;
 		view->width = output->width;
 		view->height = output->height;
 		return;
 	}
 
-	struct sway_container *ws = container_parent(view->swayc, C_WORKSPACE);
+	struct sway_workspace *ws = view->container->workspace;
 
-	int other_views = 0;
+	bool other_views = false;
 	if (config->hide_edge_borders == E_SMART) {
-		struct sway_container *con = view->swayc;
+		struct sway_container *con = view->container;
-		while (con != output) {
+		while (con) {
-			if (con->layout != L_TABBED && con->layout != L_STACKED) {
+			enum sway_container_layout layout = container_parent_layout(con);
-				other_views += con->children ? con->children->length - 1 : 0;
+			if (layout != L_TABBED && layout != L_STACKED) {
-				if (other_views > 0) {
+				list_t *siblings = container_get_siblings(con);
+				if (siblings && siblings->length > 1) {
+					other_views = true;
 					break;
 				}
 			}
@@ -202,7 +196,7 @@ void view_autoconfigure(struct sway_view *view) {
 		}
 	}
 
-	struct sway_container *con = view->swayc;
+	struct sway_container *con = view->container;
 
 	view->border_top = view->border_bottom = true;
 	view->border_left = view->border_right = true;
@@ -228,7 +222,8 @@ void view_autoconfigure(struct sway_view *view) {
 	// In a tabbed or stacked container, the swayc's y is the bottom of the
 	// title area. We have to disable any top border because the title bar is
 	// rendered by the parent.
-	if (con->parent->layout == L_TABBED || con->parent->layout == L_STACKED) {
+	enum sway_container_layout layout = container_parent_layout(con);
+	if (layout == L_TABBED || layout == L_STACKED) {
 		view->border_top = false;
 	} else {
 		y_offset = container_titlebar_height();
@@ -281,13 +276,16 @@ void view_set_activated(struct sway_view *view, bool activated) {
 }
 
 void view_request_activate(struct sway_view *view) {
-	struct sway_container *ws = container_parent(view->swayc, C_WORKSPACE);
+	struct sway_workspace *ws = view->container->workspace;
+	if (!ws) { // hidden scratchpad container
+		return;
+	}
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
 
 	switch (config->focus_on_window_activation) {
 	case FOWA_SMART:
 		if (workspace_is_visible(ws)) {
-			seat_set_focus(seat, view->swayc);
+			seat_set_focus(seat, &view->container->node);
 		} else {
 			view_set_urgent(view, true);
 		}
@@ -296,7 +294,7 @@ void view_request_activate(struct sway_view *view) {
 		view_set_urgent(view, true);
 		break;
 	case FOWA_FOCUS:
-		seat_set_focus(seat, view->swayc);
+		seat_set_focus(seat, &view->container->node);
 		break;
 	case FOWA_NONE:
 		break;
@@ -331,23 +329,12 @@ void view_close_popups(struct sway_view *view) {
 }
 
 void view_damage_from(struct sway_view *view) {
-	for (int i = 0; i < root_container.children->length; ++i) {
+	for (int i = 0; i < root->outputs->length; ++i) {
-		struct sway_container *cont = root_container.children->items[i];
+		struct sway_output *output = root->outputs->items[i];
-		if (cont->type == C_OUTPUT) {
+		output_damage_from_view(output, view);
-			output_damage_from_view(cont->sway_output, view);
-		}
 	}
 }
 
-static void view_get_layout_box(struct sway_view *view, struct wlr_box *box) {
-	struct sway_container *output = container_parent(view->swayc, C_OUTPUT);
-
-	box->x = output->x + view->swayc->x;
-	box->y = output->y + view->swayc->y;
-	box->width = view->width;
-	box->height = view->height;
-}
-
 void view_for_each_surface(struct sway_view *view,
 		wlr_surface_iterator_func_t iterator, void *user_data) {
 	if (!view->surface) {
@@ -396,11 +383,8 @@ static bool view_has_executed_criteria(struct sway_view *view,
 }
 
 void view_execute_criteria(struct sway_view *view) {
-	if (!view->swayc) {
-		return;
-	}
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *prior_focus = seat_get_focus(seat);
+	struct sway_node *prior_focus = seat_get_focus(seat);
 	list_t *criterias = criteria_for_view(view, CT_COMMAND);
 	for (int i = 0; i < criterias->length; i++) {
 		struct criteria *criteria = criterias->items[i];
@@ -411,7 +395,7 @@ void view_execute_criteria(struct sway_view *view) {
 		}
 		wlr_log(WLR_DEBUG, "for_window '%s' matches view %p, cmd: '%s'",
 				criteria->raw, view, criteria->cmdlist);
-		seat_set_focus(seat, view->swayc);
+		seat_set_focus(seat, &view->container->node);
 		list_add(view->executed_criteria, criteria);
 		struct cmd_results *res = execute_command(criteria->cmdlist, NULL);
 		if (res->status != CMD_SUCCESS) {
@@ -423,19 +407,19 @@ void view_execute_criteria(struct sway_view *view) {
 	seat_set_focus(seat, prior_focus);
 }
 
-static struct sway_container *select_workspace(struct sway_view *view) {
+static struct sway_workspace *select_workspace(struct sway_view *view) {
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
 
 	// Check if there's any `assign` criteria for the view
 	list_t *criterias = criteria_for_view(view,
 			CT_ASSIGN_WORKSPACE | CT_ASSIGN_WORKSPACE_NUMBER | CT_ASSIGN_OUTPUT);
-	struct sway_container *ws = NULL;
+	struct sway_workspace *ws = NULL;
 	for (int i = 0; i < criterias->length; ++i) {
 		struct criteria *criteria = criterias->items[i];
 		if (criteria->type == CT_ASSIGN_OUTPUT) {
-			struct sway_container *output = output_by_name(criteria->target);
+			struct sway_output *output = output_by_name(criteria->target);
 			if (output) {
-				ws = seat_get_active_child(seat, output);
+				ws = output_get_active_workspace(output);
 				break;
 			}
 		} else {
@@ -484,20 +468,14 @@ static struct sway_container *select_workspace(struct sway_view *view) {
 	}
 
 	// Use the focused workspace
-	ws = seat_get_focus_inactive(seat, &root_container);
+	return seat_get_focused_workspace(seat);
-	if (ws->type != C_WORKSPACE) {
-		ws = container_parent(ws, C_WORKSPACE);
-	}
-	return ws;
 }
 
 static bool should_focus(struct sway_view *view) {
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *prev_focus =
+	struct sway_container *prev_con = seat_get_focused_container(seat);
-		seat_get_focus_inactive(seat, &root_container);
+	struct sway_workspace *prev_ws = seat_get_focused_workspace(seat);
-	struct sway_container *prev_ws = prev_focus->type == C_WORKSPACE ?
+	struct sway_workspace *map_ws = view->container->workspace;
-		prev_focus : container_parent(prev_focus, C_WORKSPACE);
-	struct sway_container *map_ws = container_parent(view->swayc, C_WORKSPACE);
 
 	// Views can only take focus if they are mapped into the active workspace
 	if (prev_ws != map_ws) {
@@ -506,10 +484,9 @@ static bool should_focus(struct sway_view *view) {
 
 	// If the view is the only one in the focused workspace, it'll get focus
 	// regardless of any no_focus criteria.
-	struct sway_container *parent = view->swayc->parent;
+	if (!view->container->parent && !prev_con) {
-	if (parent->type == C_WORKSPACE && prev_focus == parent) {
+		size_t num_children = view->container->workspace->tiling->length +
-		size_t num_children = parent->children->length +
+			view->container->workspace->floating->length;
-			parent->sway_workspace->floating->length;
 		if (num_children == 1) {
 			return true;
 		}
@@ -529,16 +506,24 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface) {
 	view->surface = wlr_surface;
 
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *ws = select_workspace(view);
+	struct sway_workspace *ws = select_workspace(view);
-	struct sway_container *target_sibling = seat_get_focus_inactive(seat, ws);
+	struct sway_node *node = seat_get_focus_inactive(seat, &ws->node);
+	struct sway_container *target_sibling = node->type == N_CONTAINER ?
+		node->sway_container : NULL;
 
 	// If we're about to launch the view into the floating container, then
 	// launch it as a tiled view in the root of the workspace instead.
-	if (container_is_floating(target_sibling)) {
+	if (target_sibling && container_is_floating(target_sibling)) {
-		target_sibling = target_sibling->parent;
+		target_sibling = NULL;
 	}
 
-	view->swayc = container_view_create(target_sibling, view);
+	view->container = container_create(view);
+	if (target_sibling) {
+		container_add_sibling(target_sibling, view->container);
+	} else {
+		workspace_add_tiling(ws, view->container);
+	}
+	ipc_event_window(view->container, "new");
 
 	view_init_subsurfaces(view, wlr_surface);
 	wl_signal_add(&wlr_surface->events.new_subsurface,
@@ -548,7 +533,7 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface) {
 	if (view->impl->wants_floating && view->impl->wants_floating(view)) {
 		view->border = config->floating_border;
 		view->border_thickness = config->floating_border_thickness;
-		container_set_floating(view->swayc, true);
+		container_set_floating(view->container, true);
 	} else {
 		view->border = config->border;
 		view->border_thickness = config->border_thickness;
@@ -556,11 +541,11 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface) {
 	}
 
 	if (should_focus(view)) {
-		input_manager_set_focus(input_manager, view->swayc);
+		input_manager_set_focus(input_manager, &view->container->node);
 	}
 
 	view_update_title(view, false);
-	container_notify_subtree_changed(view->swayc->parent);
+	container_update_representation(view->container);
 	view_execute_criteria(view);
 }
 
@@ -574,17 +559,17 @@ void view_unmap(struct sway_view *view) {
 		view->urgent_timer = NULL;
 	}
 
-	bool was_fullscreen = view->swayc->is_fullscreen;
+	struct sway_container *parent = view->container->parent;
-	struct sway_container *parent = view->swayc->parent;
+	struct sway_workspace *ws = view->container->workspace;
-	container_begin_destroy(view->swayc);
+	container_begin_destroy(view->container);
-	struct sway_container *surviving_ancestor = container_reap_empty(parent);
+	if (parent) {
+		container_reap_empty(parent);
+	} else if (ws) {
+		workspace_consider_destroy(ws);
+	}
 
-	// If the workspace wasn't reaped
+	if (ws && !ws->node.destroying) {
-	if (surviving_ancestor && surviving_ancestor->type >= C_WORKSPACE) {
+		arrange_workspace(ws);
-		struct sway_container *ws = surviving_ancestor->type == C_WORKSPACE ?
-			surviving_ancestor :
-			container_parent(surviving_ancestor, C_WORKSPACE);
-		arrange_windows(was_fullscreen ? ws : surviving_ancestor);
 		workspace_detect_urgent(ws);
 	}
 
@@ -593,15 +578,15 @@ void view_unmap(struct sway_view *view) {
 }
 
 void view_update_size(struct sway_view *view, int width, int height) {
-	if (!sway_assert(container_is_floating(view->swayc),
+	if (!sway_assert(container_is_floating(view->container),
 				"Expected a floating container")) {
 		return;
 	}
 	view->width = width;
 	view->height = height;
-	view->swayc->current.view_width = width;
+	view->container->current.view_width = width;
-	view->swayc->current.view_height = height;
+	view->container->current.view_height = height;
-	container_set_geometry_from_floating_view(view->swayc);
+	container_set_geometry_from_floating_view(view->container);
 }
 
 static void view_subsurface_create(struct sway_view *view,
@@ -670,27 +655,18 @@ void view_child_init(struct sway_view_child *child,
 	wl_signal_add(&view->events.unmap, &child->view_unmap);
 	child->view_unmap.notify = view_child_handle_view_unmap;
 
-	struct sway_container *output = child->view->swayc->parent;
+	struct sway_output *output = child->view->container->workspace->output;
-	if (output != NULL) {
+	wlr_surface_send_enter(child->surface, output->wlr_output);
-		if (output->type != C_OUTPUT) {
-			output = container_parent(output, C_OUTPUT);
-		}
-		wlr_surface_send_enter(child->surface, output->sway_output->wlr_output);
-	}
 
 	view_init_subsurfaces(child->view, surface);
 
 	// TODO: only damage the whole child
-	if (child->view->swayc) {
+	container_damage_whole(child->view->container);
-		container_damage_whole(child->view->swayc);
-	}
 }
 
 void view_child_destroy(struct sway_view_child *child) {
 	// TODO: only damage the whole child
-	if (child->view->swayc) {
+	container_damage_whole(child->view->container);
-		container_damage_whole(child->view->swayc);
-	}
 
 	wl_list_remove(&child->surface_commit.link);
 	wl_list_remove(&child->surface_destroy.link);
@@ -808,22 +784,20 @@ static char *escape_title(char *buffer) {
 }
 
 void view_update_title(struct sway_view *view, bool force) {
-	if (!view->swayc) {
-		return;
-	}
 	const char *title = view_get_title(view);
 
 	if (!force) {
-		if (title && view->swayc->name && strcmp(title, view->swayc->name) == 0) {
+		if (title && view->container->title &&
+				strcmp(title, view->container->title) == 0) {
 			return;
 		}
-		if (!title && !view->swayc->name) {
+		if (!title && !view->container->title) {
 			return;
 		}
 	}
 
-	free(view->swayc->name);
+	free(view->container->title);
-	free(view->swayc->formatted_title);
+	free(view->container->formatted_title);
 	if (title) {
 		size_t len = parse_title_format(view, NULL);
 		char *buffer = calloc(len + 1, sizeof(char));
@@ -836,25 +810,25 @@ void view_update_title(struct sway_view *view, bool force) {
 			buffer = escape_title(buffer);
 		}
 
-		view->swayc->name = strdup(title);
+		view->container->title = strdup(title);
-		view->swayc->formatted_title = buffer;
+		view->container->formatted_title = buffer;
 	} else {
-		view->swayc->name = NULL;
+		view->container->title = NULL;
-		view->swayc->formatted_title = NULL;
+		view->container->formatted_title = NULL;
 	}
-	container_calculate_title_height(view->swayc);
+	container_calculate_title_height(view->container);
 	config_update_font_height(false);
 
 	// Update title after the global font height is updated
-	container_update_title_textures(view->swayc);
+	container_update_title_textures(view->container);
 
-	ipc_event_window(view->swayc, "title");
+	ipc_event_window(view->container, "title");
 }
 
 static bool find_by_mark_iterator(struct sway_container *con,
 		void *data) {
 	char *mark = data;
-	return con->type == C_VIEW && view_has_mark(con->sway_view, mark);
+	return con->view && view_has_mark(con->view, mark);
 }
 
 struct sway_view *view_find_mark(char *mark) {
@@ -863,7 +837,7 @@ struct sway_view *view_find_mark(char *mark) {
 	if (!container) {
 		return NULL;
 	}
-	return container->sway_view;
+	return container->view;
 }
 
 bool view_find_and_unmark(char *mark) {
@@ -872,7 +846,7 @@ bool view_find_and_unmark(char *mark) {
 	if (!container) {
 		return false;
 	}
-	struct sway_view *view = container->sway_view;
+	struct sway_view *view = container->view;
 
 	for (int i = 0; i < view->marks->length; ++i) {
 		char *view_mark = view->marks->items[i];
@@ -888,10 +862,9 @@ bool view_find_and_unmark(char *mark) {
 }
 
 void view_clear_marks(struct sway_view *view) {
-	while (view->marks->length) {
+	list_foreach(view->marks, free);
-		list_del(view->marks, 0);
+	view->marks->length = 0;
-		ipc_event_window(view->swayc, "mark");
+	ipc_event_window(view->container, "mark");
-	}
 }
 
 bool view_has_mark(struct sway_view *view, char *mark) {
@@ -906,12 +879,13 @@ bool view_has_mark(struct sway_view *view, char *mark) {
 
 void view_add_mark(struct sway_view *view, char *mark) {
 	list_add(view->marks, strdup(mark));
-	ipc_event_window(view->swayc, "mark");
+	ipc_event_window(view->container, "mark");
 }
 
 static void update_marks_texture(struct sway_view *view,
 		struct wlr_texture **texture, struct border_colors *class) {
-	struct sway_output *output = container_get_effective_output(view->swayc);
+	struct sway_output *output =
+		container_get_effective_output(view->container);
 	if (!output) {
 		return;
 	}
@@ -949,7 +923,7 @@ static void update_marks_texture(struct sway_view *view,
 
 	double scale = output->wlr_output->scale;
 	int width = 0;
-	int height = view->swayc->title_height * scale;
+	int height = view->container->title_height * scale;
 
 	cairo_t *c = cairo_create(NULL);
 	get_text_size(c, config->font, &width, NULL, scale, false, "%s", buffer);
@@ -994,44 +968,40 @@ void view_update_marks_textures(struct sway_view *view) {
 			&config->border_colors.unfocused);
 	update_marks_texture(view, &view->marks_urgent,
 			&config->border_colors.urgent);
-	container_damage_whole(view->swayc);
+	container_damage_whole(view->container);
 }
 
 bool view_is_visible(struct sway_view *view) {
-	if (!view->swayc || view->swayc->destroying) {
+	if (view->container->node.destroying) {
 		return false;
 	}
-	struct sway_container *workspace =
+	struct sway_workspace *workspace = view->container->workspace;
-		container_parent(view->swayc, C_WORKSPACE);
 	if (!workspace) {
 		return false;
 	}
-	// Determine if view is nested inside a floating container which is sticky.
+	// Determine if view is nested inside a floating container which is sticky
-	// A simple floating view will have this ancestry:
+	struct sway_container *floater = view->container;
-	// C_VIEW -> floating -> workspace
+	while (floater->parent) {
-	// A more complex ancestry could be:
-	// C_VIEW -> C_CONTAINER (tabbed) -> floating -> workspace
-	struct sway_container *floater = view->swayc;
-	while (floater->parent->type != C_WORKSPACE
-			&& floater->parent->parent->type != C_WORKSPACE) {
 		floater = floater->parent;
 	}
 	bool is_sticky = container_is_floating(floater) && floater->is_sticky;
 	// Check view isn't in a tabbed or stacked container on an inactive tab
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *container = view->swayc;
+	struct sway_container *container = view->container;
-	while (container->type != C_WORKSPACE) {
+	while (container) {
-		if (container->parent->layout == L_TABBED ||
+		enum sway_container_layout layout = container_parent_layout(container);
-				container->parent->layout == L_STACKED) {
+		if (layout == L_TABBED || layout == L_STACKED) {
-			if (seat_get_active_child(seat, container->parent) != container) {
+			struct sway_node *parent = container->parent ?
+				&container->parent->node : &container->workspace->node;
+			if (seat_get_active_child(seat, parent) != &container->node) {
 				return false;
 			}
 		}
 		container = container->parent;
 	}
 	// Check view isn't hidden by another fullscreen view
-	if (workspace->sway_workspace->fullscreen &&
+	if (workspace->fullscreen &&
-			!container_is_fullscreen_or_child(view->swayc)) {
+			!container_is_fullscreen_or_child(view->container)) {
 		return false;
 	}
 	// Check the workspace is visible
@@ -1047,7 +1017,7 @@ void view_set_urgent(struct sway_view *view, bool enable) {
 	}
 	if (enable) {
 		struct sway_seat *seat = input_manager_current_seat(input_manager);
-		if (seat_get_focus(seat) == view->swayc) {
+		if (seat_get_focused_container(seat) == view->container) {
 			return;
 		}
 		clock_gettime(CLOCK_MONOTONIC, &view->urgent);
@@ -1058,12 +1028,13 @@ void view_set_urgent(struct sway_view *view, bool enable) {
 			view->urgent_timer = NULL;
 		}
 	}
-	container_damage_whole(view->swayc);
+	container_damage_whole(view->container);
 
-	ipc_event_window(view->swayc, "urgent");
+	ipc_event_window(view->container, "urgent");
 
-	struct sway_container *ws = container_parent(view->swayc, C_WORKSPACE);
+	if (view->container->workspace) {
-	workspace_detect_urgent(ws);
+		workspace_detect_urgent(view->container->workspace);
+	}
 }
 
 bool view_is_urgent(struct sway_view *view) {

sway/tree/workspace.c

@@ -12,128 +12,105 @@
 #include "sway/output.h"
 #include "sway/tree/arrange.h"
 #include "sway/tree/container.h"
+#include "sway/tree/node.h"
 #include "sway/tree/view.h"
 #include "sway/tree/workspace.h"
 #include "list.h"
 #include "log.h"
 #include "util.h"
 
-struct sway_container *workspace_get_initial_output(const char *name) {
+struct sway_output *workspace_get_initial_output(const char *name) {
-	struct sway_container *parent;
 	// Search for workspace<->output pair
-	int e = config->workspace_outputs->length;
 	for (int i = 0; i < config->workspace_outputs->length; ++i) {
 		struct workspace_output *wso = config->workspace_outputs->items[i];
 		if (strcasecmp(wso->workspace, name) == 0) {
 			// Find output to use if it exists
-			e = root_container.children->length;
+			struct sway_output *output = output_by_name(wso->output);
-			for (i = 0; i < e; ++i) {
+			if (output) {
-				parent = root_container.children->items[i];
+				return output;
-				if (strcmp(parent->name, wso->output) == 0) {
-					return parent;
-				}
 			}
 			break;
 		}
 	}
 	// Otherwise put it on the focused output
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *focus =
+	struct sway_workspace *focus = seat_get_focused_workspace(seat);
-		seat_get_focus_inactive(seat, &root_container);
+	return focus->output;
-	parent = focus;
-	parent = container_parent(parent, C_OUTPUT);
-	return parent;
 }
 
-struct sway_container *workspace_create(struct sway_container *output,
+struct sway_workspace *workspace_create(struct sway_output *output,
 		const char *name) {
 	if (output == NULL) {
 		output = workspace_get_initial_output(name);
 	}
 
-	wlr_log(WLR_DEBUG, "Added workspace %s for output %s", name, output->name);
+	wlr_log(WLR_DEBUG, "Adding workspace %s for output %s", name,
-	struct sway_container *workspace = container_create(C_WORKSPACE);
+			output->wlr_output->name);
 
-	workspace->x = output->x;
+	struct sway_workspace *ws = calloc(1, sizeof(struct sway_workspace));
-	workspace->y = output->y;
+	if (!ws) {
-	workspace->width = output->width;
+		wlr_log(WLR_ERROR, "Unable to allocate sway_workspace");
-	workspace->height = output->height;
-	workspace->name = !name ? NULL : strdup(name);
-	workspace->prev_split_layout = L_NONE;
-	workspace->layout = container_get_default_layout(output);
-
-	struct sway_workspace *swayws = calloc(1, sizeof(struct sway_workspace));
-	if (!swayws) {
 		return NULL;
 	}
-	swayws->swayc = workspace;
+	node_init(&ws->node, N_WORKSPACE, ws);
-	swayws->floating = create_list();
+	ws->x = output->lx;
-	swayws->output_priority = create_list();
+	ws->y = output->ly;
-	workspace->sway_workspace = swayws;
+	ws->width = output->width;
-	workspace_output_add_priority(workspace, output);
+	ws->height = output->height;
+	ws->name = name ? strdup(name) : NULL;
+	ws->prev_split_layout = L_NONE;
+	ws->layout = output_get_default_layout(output);
+	ws->floating = create_list();
+	ws->tiling = create_list();
+	ws->output_priority = create_list();
+	workspace_output_add_priority(ws, output);
 
-	container_add_child(output, workspace);
+	output_add_workspace(output, ws);
 	output_sort_workspaces(output);
-	container_create_notify(workspace);
 
-	return workspace;
+	ipc_event_workspace(NULL, ws, "init");
+	wl_signal_emit(&root->events.new_node, &ws->node);
+
+	return ws;
 }
 
-void workspace_destroy(struct sway_container *workspace) {
+void workspace_destroy(struct sway_workspace *workspace) {
-	if (!sway_assert(workspace->type == C_WORKSPACE, "Expected a workspace")) {
+	if (!sway_assert(workspace->node.destroying,
-		return;
-	}
-	if (!sway_assert(workspace->destroying,
 				"Tried to free workspace which wasn't marked as destroying")) {
 		return;
 	}
-	if (!sway_assert(workspace->ntxnrefs == 0, "Tried to free workspace "
+	if (!sway_assert(workspace->node.ntxnrefs == 0, "Tried to free workspace "
 				"which is still referenced by transactions")) {
 		return;
 	}
-	// sway_workspace
-	struct sway_workspace *ws = workspace->sway_workspace;
-	list_foreach(ws->output_priority, free);
-	list_free(ws->output_priority);
-	list_free(ws->floating);
-	free(ws);
 
-	// swayc
 	free(workspace->name);
-	free(workspace->formatted_title);
+	free(workspace->representation);
-	wlr_texture_destroy(workspace->title_focused);
+	list_foreach(workspace->output_priority, free);
-	wlr_texture_destroy(workspace->title_focused_inactive);
+	list_free(workspace->output_priority);
-	wlr_texture_destroy(workspace->title_unfocused);
+	list_free(workspace->floating);
-	wlr_texture_destroy(workspace->title_urgent);
+	list_free(workspace->tiling);
-	list_free(workspace->children);
+	list_free(workspace->current.floating);
-	list_free(workspace->current.children);
+	list_free(workspace->current.tiling);
-	list_free(workspace->outputs);
 	free(workspace);
 }
 
-void workspace_begin_destroy(struct sway_container *workspace) {
+void workspace_begin_destroy(struct sway_workspace *workspace) {
-	if (!sway_assert(workspace->type == C_WORKSPACE, "Expected a workspace")) {
-		return;
-	}
 	wlr_log(WLR_DEBUG, "Destroying workspace '%s'", workspace->name);
-	wl_signal_emit(&workspace->events.destroy, workspace);
 	ipc_event_workspace(NULL, workspace, "empty"); // intentional
+	wl_signal_emit(&workspace->node.events.destroy, &workspace->node);
 
-	workspace->destroying = true;
+	if (workspace->output) {
-	container_set_dirty(workspace);
+		workspace_detach(workspace);
-
-	if (workspace->parent) {
-		container_remove_child(workspace);
 	}
+
+	workspace->node.destroying = true;
+	node_set_dirty(&workspace->node);
 }
 
-void workspace_consider_destroy(struct sway_container *ws) {
+void workspace_consider_destroy(struct sway_workspace *ws) {
-	if (!sway_assert(ws->type == C_WORKSPACE, "Expected a workspace")) {
+	if (ws->tiling->length == 0 && ws->floating->length == 0
-		return;
+			&& output_get_active_workspace(ws->output) != ws) {
-	}
-	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	if (ws->children->length == 0 && ws->sway_workspace->floating->length == 0
-			&& seat_get_active_child(seat, ws->parent) != ws) {
 		workspace_begin_destroy(ws);
 	}
 }
@@ -272,59 +249,49 @@ char *workspace_next_name(const char *output_name) {
 	}
 	// As a fall back, get the current number of active workspaces
 	// and return that + 1 for the next workspace's name
-	int ws_num = root_container.children->length;
+	int ws_num = root->outputs->length;
 	int l = snprintf(NULL, 0, "%d", ws_num);
 	char *name = malloc(l + 1);
-	if (!sway_assert(name, "Cloud not allocate workspace name")) {
+	if (!sway_assert(name, "Could not allocate workspace name")) {
 		return NULL;
 	}
 	sprintf(name, "%d", ws_num++);
 	return name;
 }
 
-static bool _workspace_by_number(struct sway_container *view, void *data) {
+static bool _workspace_by_number(struct sway_workspace *ws, void *data) {
-	if (view->type != C_WORKSPACE) {
-		return false;
-	}
 	char *name = data;
-	char *view_name = view->name;
+	char *ws_name = ws->name;
 	while (isdigit(*name)) {
-		if (*name++ != *view_name++) {
+		if (*name++ != *ws_name++) {
 			return false;
 		}
 	}
-	return !isdigit(*view_name);
+	return !isdigit(*ws_name);
 }
 
-struct sway_container *workspace_by_number(const char* name) {
+struct sway_workspace *workspace_by_number(const char* name) {
 	return root_find_workspace(_workspace_by_number, (void *) name);
 }
 
-static bool _workspace_by_name(struct sway_container *view, void *data) {
+static bool _workspace_by_name(struct sway_workspace *ws, void *data) {
-	return (view->type == C_WORKSPACE) &&
+	return strcasecmp(ws->name, data) == 0;
-		   (strcasecmp(view->name, (char *) data) == 0);
 }
 
-struct sway_container *workspace_by_name(const char *name) {
+struct sway_workspace *workspace_by_name(const char *name) {
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *current_workspace = NULL, *current_output = NULL;
+	struct sway_workspace *current = seat_get_focused_workspace(seat);
-	struct sway_container *focus = seat_get_focus(seat);
-	if (focus) {
-		current_workspace = focus->type == C_WORKSPACE ?
-			focus : container_parent(focus, C_WORKSPACE);
-		current_output = container_parent(focus, C_OUTPUT);
-	}
 
 	if (strcmp(name, "prev") == 0) {
-		return workspace_prev(current_workspace);
+		return workspace_prev(current);
 	} else if (strcmp(name, "prev_on_output") == 0) {
-		return workspace_output_prev(current_output);
+		return workspace_output_prev(current);
 	} else if (strcmp(name, "next") == 0) {
-		return workspace_next(current_workspace);
+		return workspace_next(current);
 	} else if (strcmp(name, "next_on_output") == 0) {
-		return workspace_output_next(current_output);
+		return workspace_output_next(current);
 	} else if (strcmp(name, "current") == 0) {
-		return current_workspace;
+		return current;
 	} else if (strcasecmp(name, "back_and_forth") == 0) {
 		return prev_workspace_name ?
 			root_find_workspace(_workspace_by_name, (void*)prev_workspace_name)
@@ -339,97 +306,68 @@ struct sway_container *workspace_by_name(const char *name) {
  * the end and beginning.  If next is false, the previous workspace is returned,
  * otherwise the next one is returned.
  */
-static struct sway_container *workspace_output_prev_next_impl(
+static struct sway_workspace *workspace_output_prev_next_impl(
-		struct sway_container *output, int dir) {
+		struct sway_output *output, int dir) {
-	if (!output) {
-		return NULL;
-	}
-	if (!sway_assert(output->type == C_OUTPUT,
-				"Argument must be an output, is %d", output->type)) {
-		return NULL;
-	}
-
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *focus = seat_get_focus_inactive(seat, output);
+	struct sway_workspace *workspace = seat_get_focused_workspace(seat);
-	struct sway_container *workspace = (focus->type == C_WORKSPACE ?
-			focus :
-			container_parent(focus, C_WORKSPACE));
 
-	int index = list_find(output->children, workspace);
+	int index = list_find(output->workspaces, workspace);
-	size_t new_index = wrap(index + dir, output->children->length);
+	size_t new_index = wrap(index + dir, output->workspaces->length);
-	return output->children->items[new_index];
+	return output->workspaces->items[new_index];
 }
 
 /**
  * Get the previous or next workspace. If the first/last workspace on an output
  * is active, proceed to the previous/next output's previous/next workspace.
  */
-static struct sway_container *workspace_prev_next_impl(
+static struct sway_workspace *workspace_prev_next_impl(
-		struct sway_container *workspace, int dir) {
+		struct sway_workspace *workspace, int dir) {
-	if (!workspace) {
+	struct sway_output *output = workspace->output;
-		return NULL;
+	int index = list_find(output->workspaces, workspace);
-	}
-	if (!sway_assert(workspace->type == C_WORKSPACE,
-				"Argument must be a workspace, is %d", workspace->type)) {
-		return NULL;
-	}
-
-	struct sway_container *output = workspace->parent;
-	int index = list_find(output->children, workspace);
 	int new_index = index + dir;
 
-	if (new_index >= 0 && new_index < output->children->length) {
+	if (new_index >= 0 && new_index < output->workspaces->length) {
-		return output->children->items[index + dir];
+		return output->workspaces->items[new_index];
 	}
 
 	// Look on a different output
-	int output_index = list_find(root_container.children, output);
+	int output_index = list_find(root->outputs, output);
-	new_index = wrap(output_index + dir, root_container.children->length);
+	new_index = wrap(output_index + dir, root->outputs->length);
-	output = root_container.children->items[new_index];
+	output = root->outputs->items[new_index];
 
 	if (dir == 1) {
-		return output->children->items[0];
+		return output->workspaces->items[0];
 	} else {
-		return output->children->items[output->children->length - 1];
+		return output->workspaces->items[output->workspaces->length - 1];
 	}
 }
 
-struct sway_container *workspace_output_next(struct sway_container *current) {
+struct sway_workspace *workspace_output_next(struct sway_workspace *current) {
-	return workspace_output_prev_next_impl(current, 1);
+	return workspace_output_prev_next_impl(current->output, 1);
 }
 
-struct sway_container *workspace_next(struct sway_container *current) {
+struct sway_workspace *workspace_next(struct sway_workspace *current) {
 	return workspace_prev_next_impl(current, 1);
 }
 
-struct sway_container *workspace_output_prev(struct sway_container *current) {
+struct sway_workspace *workspace_output_prev(struct sway_workspace *current) {
-	return workspace_output_prev_next_impl(current, -1);
+	return workspace_output_prev_next_impl(current->output, -1);
 }
 
-struct sway_container *workspace_prev(struct sway_container *current) {
+struct sway_workspace *workspace_prev(struct sway_workspace *current) {
 	return workspace_prev_next_impl(current, -1);
 }
 
-bool workspace_switch(struct sway_container *workspace,
+bool workspace_switch(struct sway_workspace *workspace,
 		bool no_auto_back_and_forth) {
-	if (!workspace) {
-		return false;
-	}
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *focus =
+	struct sway_node *focus = seat_get_focus_inactive(seat, &root->node);
-		seat_get_focus_inactive(seat, &root_container);
+	struct sway_workspace *active_ws = seat_get_focused_workspace(seat);
-	if (!seat || !focus) {
-		return false;
-	}
-	struct sway_container *active_ws = focus;
-	if (active_ws->type != C_WORKSPACE) {
-		active_ws = container_parent(focus, C_WORKSPACE);
-	}
 
 	if (!no_auto_back_and_forth && config->auto_back_and_forth
 			&& active_ws == workspace
 			&& prev_workspace_name) {
-		struct sway_container *new_ws = workspace_by_name(prev_workspace_name);
+		struct sway_workspace *new_ws = workspace_by_name(prev_workspace_name);
 		workspace = new_ws ?
 			new_ws :
 			workspace_create(NULL, prev_workspace_name);
@@ -447,21 +385,21 @@ bool workspace_switch(struct sway_container *workspace,
 	}
 
 	// Move sticky containers to new workspace
-	struct sway_container *next_output = workspace->parent;
+	struct sway_output *next_output = workspace->output;
-	struct sway_container *next_output_prev_ws =
+	struct sway_workspace *next_output_prev_ws =
-		seat_get_active_child(seat, next_output);
+		output_get_active_workspace(next_output);
-	list_t *floating = next_output_prev_ws->sway_workspace->floating;
 	bool has_sticky = false;
 	if (workspace != next_output_prev_ws) {
-		for (int i = 0; i < floating->length; ++i) {
+		for (int i = 0; i < next_output_prev_ws->floating->length; ++i) {
-			struct sway_container *floater = floating->items[i];
+			struct sway_container *floater =
+				next_output_prev_ws->floating->items[i];
 			if (floater->is_sticky) {
 				has_sticky = true;
-				container_remove_child(floater);
+				container_detach(floater);
 				workspace_add_floating(workspace, floater);
-				if (floater == focus) {
+				if (&floater->node == focus) {
 					seat_set_focus(seat, NULL);
-					seat_set_focus(seat, floater);
+					seat_set_focus(seat, &floater->node);
 				}
 				--i;
 			}
@@ -470,9 +408,9 @@ bool workspace_switch(struct sway_container *workspace,
 
 	wlr_log(WLR_DEBUG, "Switching to workspace %p:%s",
 		workspace, workspace->name);
-	struct sway_container *next = seat_get_focus_inactive(seat, workspace);
+	struct sway_node *next = seat_get_focus_inactive(seat, &workspace->node);
 	if (next == NULL) {
-		next = workspace;
+		next = &workspace->node;
 	}
 	if (has_sticky) {
 		// If there's a sticky container, we might be setting focus to the same
@@ -483,35 +421,24 @@ bool workspace_switch(struct sway_container *workspace,
 		workspace_consider_destroy(active_ws);
 	}
 	seat_set_focus(seat, next);
-	struct sway_container *output = container_parent(workspace, C_OUTPUT);
+	arrange_workspace(workspace);
-	arrange_windows(output);
 	return true;
 }
 
-bool workspace_is_visible(struct sway_container *ws) {
+bool workspace_is_visible(struct sway_workspace *ws) {
-	if (ws->destroying) {
+	if (ws->node.destroying) {
 		return false;
 	}
-	struct sway_container *output = container_parent(ws, C_OUTPUT);
+	return output_get_active_workspace(ws->output) == ws;
-	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *focus = seat_get_focus_inactive(seat, output);
-	if (focus->type != C_WORKSPACE) {
-		focus = container_parent(focus, C_WORKSPACE);
-	}
-	return focus == ws;
 }
 
-bool workspace_is_empty(struct sway_container *ws) {
+bool workspace_is_empty(struct sway_workspace *ws) {
-	if (!sway_assert(ws->type == C_WORKSPACE, "Expected a workspace")) {
+	if (ws->tiling->length) {
-		return false;
-	}
-	if (ws->children->length) {
 		return false;
 	}
 	// Sticky views are not considered to be part of this workspace
-	list_t *floating = ws->sway_workspace->floating;
+	for (int i = 0; i < ws->floating->length; ++i) {
-	for (int i = 0; i < floating->length; ++i) {
+		struct sway_container *floater = ws->floating->items[i];
-		struct sway_container *floater = floating->items[i];
 		if (!floater->is_sticky) {
 			return false;
 		}
@@ -523,20 +450,19 @@ static int find_output(const void *id1, const void *id2) {
 	return strcmp(id1, id2) ? 0 : 1;
 }
 
-void workspace_output_raise_priority(struct sway_container *workspace,
+void workspace_output_raise_priority(struct sway_workspace *ws,
-		struct sway_container *old_output, struct sway_container *output) {
+		struct sway_output *old_output, struct sway_output *output) {
-	struct sway_workspace *ws = workspace->sway_workspace;
-
 	int old_index = list_seq_find(ws->output_priority, find_output,
-			old_output->name);
+			old_output->wlr_output->name);
 	if (old_index < 0) {
 		return;
 	}
 
 	int new_index = list_seq_find(ws->output_priority, find_output,
-			output->name);
+			output->wlr_output->name);
 	if (new_index < 0) {
-		list_insert(ws->output_priority, old_index, strdup(output->name));
+		list_insert(ws->output_priority, old_index,
+				strdup(output->wlr_output->name));
 	} else if (new_index > old_index) {
 		char *name = ws->output_priority->items[new_index];
 		list_del(ws->output_priority, new_index);
@@ -544,29 +470,24 @@ void workspace_output_raise_priority(struct sway_container *workspace,
 	}
 }
 
-void workspace_output_add_priority(struct sway_container *workspace,
+void workspace_output_add_priority(struct sway_workspace *workspace,
-		struct sway_container *output) {
+		struct sway_output *output) {
-	int index = list_seq_find(workspace->sway_workspace->output_priority,
+	int index = list_seq_find(workspace->output_priority,
-			find_output, output->name);
+			find_output, output->wlr_output->name);
 	if (index < 0) {
-		list_add(workspace->sway_workspace->output_priority,
+		list_add(workspace->output_priority, strdup(output->wlr_output->name));
-				strdup(output->name));
 	}
 }
 
-static bool _output_by_name(struct sway_container *output, void *data) {
+struct sway_output *workspace_output_get_highest_available(
-	return output->type == C_OUTPUT && strcasecmp(output->name, data) == 0;
+		struct sway_workspace *ws, struct sway_output *exclude) {
-}
+	for (int i = 0; i < ws->output_priority->length; i++) {
-
+		char *name = ws->output_priority->items[i];
-struct sway_container *workspace_output_get_highest_available(
+		if (exclude && strcasecmp(name, exclude->wlr_output->name) == 0) {
-		struct sway_container *ws, struct sway_container *exclude) {
-	for (int i = 0; i < ws->sway_workspace->output_priority->length; i++) {
-		char *name = ws->sway_workspace->output_priority->items[i];
-		if (exclude && strcasecmp(name, exclude->name) == 0) {
 			continue;
 		}
 
-		struct sway_container *output = root_find_output(_output_by_name, name);
+		struct sway_output *output = output_by_name(name);
 		if (output) {
 			return output;
 		}
@@ -576,49 +497,42 @@ struct sway_container *workspace_output_get_highest_available(
 }
 
 static bool find_urgent_iterator(struct sway_container *con, void *data) {
-	return con->type == C_VIEW && view_is_urgent(con->sway_view);
+	return con->view && view_is_urgent(con->view);
 }
 
-void workspace_detect_urgent(struct sway_container *workspace) {
+void workspace_detect_urgent(struct sway_workspace *workspace) {
 	bool new_urgent = (bool)workspace_find_container(workspace,
 			find_urgent_iterator, NULL);
 
-	if (workspace->sway_workspace->urgent != new_urgent) {
+	if (workspace->urgent != new_urgent) {
-		workspace->sway_workspace->urgent = new_urgent;
+		workspace->urgent = new_urgent;
 		ipc_event_workspace(NULL, workspace, "urgent");
-		container_damage_whole(workspace);
+		output_damage_whole(workspace->output);
 	}
 }
 
-void workspace_for_each_container(struct sway_container *ws,
+void workspace_for_each_container(struct sway_workspace *ws,
 		void (*f)(struct sway_container *con, void *data), void *data) {
-	if (!sway_assert(ws->type == C_WORKSPACE, "Expected a workspace")) {
-		return;
-	}
 	// Tiling
-	for (int i = 0; i < ws->children->length; ++i) {
+	for (int i = 0; i < ws->tiling->length; ++i) {
-		struct sway_container *container = ws->children->items[i];
+		struct sway_container *container = ws->tiling->items[i];
 		f(container, data);
 		container_for_each_child(container, f, data);
 	}
 	// Floating
-	for (int i = 0; i < ws->sway_workspace->floating->length; ++i) {
+	for (int i = 0; i < ws->floating->length; ++i) {
-		struct sway_container *container =
+		struct sway_container *container = ws->floating->items[i];
-			ws->sway_workspace->floating->items[i];
 		f(container, data);
 		container_for_each_child(container, f, data);
 	}
 }
 
-struct sway_container *workspace_find_container(struct sway_container *ws,
+struct sway_container *workspace_find_container(struct sway_workspace *ws,
 		bool (*test)(struct sway_container *con, void *data), void *data) {
-	if (!sway_assert(ws->type == C_WORKSPACE, "Expected a workspace")) {
-		return NULL;
-	}
 	struct sway_container *result = NULL;
 	// Tiling
-	for (int i = 0; i < ws->children->length; ++i) {
+	for (int i = 0; i < ws->tiling->length; ++i) {
-		struct sway_container *child = ws->children->items[i];
+		struct sway_container *child = ws->tiling->items[i];
 		if (test(child, data)) {
 			return child;
 		}
@@ -627,8 +541,8 @@ struct sway_container *workspace_find_container(struct sway_container *ws,
 		}
 	}
 	// Floating
-	for (int i = 0; i < ws->sway_workspace->floating->length; ++i) {
+	for (int i = 0; i < ws->floating->length; ++i) {
-		struct sway_container *child = ws->sway_workspace->floating->items[i];
+		struct sway_container *child = ws->floating->items[i];
 		if (test(child, data)) {
 			return child;
 		}
@@ -639,37 +553,76 @@ struct sway_container *workspace_find_container(struct sway_container *ws,
 	return NULL;
 }
 
-struct sway_container *workspace_wrap_children(struct sway_container *ws) {
+struct sway_container *workspace_wrap_children(struct sway_workspace *ws) {
-	struct sway_container *middle = container_create(C_CONTAINER);
+	struct sway_container *middle = container_create(NULL);
 	middle->layout = ws->layout;
-	while (ws->children->length) {
+	while (ws->tiling->length) {
-		struct sway_container *child = ws->children->items[0];
+		struct sway_container *child = ws->tiling->items[0];
-		container_remove_child(child);
+		container_detach(child);
 		container_add_child(middle, child);
 	}
-	container_add_child(ws, middle);
+	workspace_add_tiling(ws, middle);
 	return middle;
 }
 
-void workspace_add_floating(struct sway_container *workspace,
+void workspace_detach(struct sway_workspace *workspace) {
-		struct sway_container *con) {
+	struct sway_output *output = workspace->output;
-	if (!sway_assert(workspace->type == C_WORKSPACE, "Expected a workspace")) {
+	int index = list_find(output->workspaces, workspace);
-		return;
+	if (index != -1) {
-	}
+		list_del(output->workspaces, index);
-	if (!sway_assert(con->parent == NULL, "Expected an orphan container")) {
-		return;
 	}
+	workspace->output = NULL;
 
-	list_add(workspace->sway_workspace->floating, con);
+	node_set_dirty(&workspace->node);
-	con->parent = workspace;
+	node_set_dirty(&output->node);
-	container_set_dirty(workspace);
-	container_set_dirty(con);
 }
 
-void workspace_remove_gaps(struct sway_container *ws) {
+static void set_workspace(struct sway_container *container, void *data) {
-	if (!sway_assert(ws->type == C_WORKSPACE, "Expected a workspace")) {
+	container->workspace = container->parent->workspace;
-		return;
+}
+
+void workspace_add_tiling(struct sway_workspace *workspace,
+		struct sway_container *con) {
+	if (con->workspace) {
+		container_detach(con);
 	}
+	list_add(workspace->tiling, con);
+	con->workspace = workspace;
+	container_for_each_child(con, set_workspace, NULL);
+	container_handle_fullscreen_reparent(con);
+	workspace_update_representation(workspace);
+	node_set_dirty(&workspace->node);
+	node_set_dirty(&con->node);
+}
+
+void workspace_add_floating(struct sway_workspace *workspace,
+		struct sway_container *con) {
+	if (con->workspace) {
+		container_detach(con);
+	}
+	list_add(workspace->floating, con);
+	con->workspace = workspace;
+	container_for_each_child(con, set_workspace, NULL);
+	container_handle_fullscreen_reparent(con);
+	node_set_dirty(&workspace->node);
+	node_set_dirty(&con->node);
+}
+
+void workspace_insert_tiling(struct sway_workspace *workspace,
+		struct sway_container *con, int index) {
+	if (con->workspace) {
+		container_detach(con);
+	}
+	list_insert(workspace->tiling, index, con);
+	con->workspace = workspace;
+	container_for_each_child(con, set_workspace, NULL);
+	container_handle_fullscreen_reparent(con);
+	workspace_update_representation(workspace);
+	node_set_dirty(&workspace->node);
+	node_set_dirty(&con->node);
+}
+
+void workspace_remove_gaps(struct sway_workspace *ws) {
 	if (ws->current_gaps == 0) {
 		return;
 	}
@@ -681,15 +634,12 @@ void workspace_remove_gaps(struct sway_container *ws) {
 	ws->current_gaps = 0;
 }
 
-void workspace_add_gaps(struct sway_container *ws) {
+void workspace_add_gaps(struct sway_workspace *ws) {
-	if (!sway_assert(ws->type == C_WORKSPACE, "Expected a workspace")) {
-		return;
-	}
 	if (ws->current_gaps > 0) {
 		return;
 	}
 	bool should_apply =
-		config->edge_gaps || (config->smart_gaps && ws->children->length > 1);
+		config->edge_gaps || (config->smart_gaps && ws->tiling->length > 1);
 	if (!should_apply) {
 		return;
 	}
@@ -708,3 +658,36 @@ void workspace_add_gaps(struct sway_container *ws) {
 	ws->width -= 2 * ws->current_gaps;
 	ws->height -= 2 * ws->current_gaps;
 }
+
+struct sway_container *workspace_split(struct sway_workspace *workspace,
+		enum sway_container_layout layout) {
+	if (workspace->tiling->length == 0) {
+		workspace->prev_split_layout = workspace->layout;
+		workspace->layout = layout;
+		return NULL;
+	}
+
+	enum sway_container_layout old_layout = workspace->layout;
+	struct sway_container *middle = workspace_wrap_children(workspace);
+	workspace->layout = layout;
+	middle->layout = old_layout;
+
+	return middle;
+}
+
+void workspace_update_representation(struct sway_workspace *ws) {
+	size_t len = container_build_representation(ws->layout, ws->tiling, NULL);
+	free(ws->representation);
+	ws->representation = calloc(len + 1, sizeof(char));
+	if (!sway_assert(ws->representation, "Unable to allocate title string")) {
+		return;
+	}
+	container_build_representation(ws->layout, ws->tiling, ws->representation);
+}
+
+void workspace_get_box(struct sway_workspace *workspace, struct wlr_box *box) {
+	box->x = workspace->x;
+	box->y = workspace->y;
+	box->width = workspace->width;
+	box->height = workspace->height;
+}