Implement floating

include/sway/tree/container.h

@@ -75,8 +75,13 @@ struct sway_container {
 	enum sway_container_layout layout;
 	enum sway_container_layout prev_layout;
 
+	// Allow the container to be automatically removed if it's empty. True by
+	// default, false for the magic floating container that each workspace has.
+	bool reapable;
+
 	// Saves us from searching the list of children/floating in the parent
 	bool is_floating;
+	bool is_sticky;
 
 	// For C_ROOT, this has no meaning
 	// For C_OUTPUT, this is the output position in layout coordinates
@@ -173,6 +178,13 @@ struct sway_container *container_at(struct sway_container *container,
 		double ox, double oy, struct wlr_surface **surface,
 		double *sx, double *sy);
 
+/**
+ * Same as container_at, but only checks floating views and expects coordinates
+ * to be layout coordinates, as that's what floating views use.
+ */
+struct sway_container *floating_container_at(double lx, double ly,
+		struct wlr_surface **surface, double *sx, double *sy);
+
 /**
  * Apply the function for each descendant of the container breadth first.
  */
@@ -229,4 +241,14 @@ void container_notify_subtree_changed(struct sway_container *container);
  */
 size_t container_titlebar_height(void);
 
+void container_set_floating(struct sway_container *container, bool enable);
+
+void container_set_geometry_from_view(struct sway_container *container);
+
+/**
+ * Determine if the given container is itself floating or has a floating
+ * ancestor.
+ */
+bool container_self_or_parent_floating(struct sway_container *container);
+
 #endif

include/sway/tree/layout.h

@@ -46,9 +46,6 @@ struct sway_container *container_add_sibling(struct sway_container *parent,
 
 struct sway_container *container_remove_child(struct sway_container *child);
 
-void container_add_floating(struct sway_container *workspace,
-		struct sway_container *child);
-
 struct sway_container *container_replace_child(struct sway_container *child,
 		struct sway_container *new_child);
 

include/sway/tree/view.h

@@ -32,7 +32,9 @@ struct sway_view_impl {
 	void (*configure)(struct sway_view *view, double ox, double oy, int width,
 		int height);
 	void (*set_activated)(struct sway_view *view, bool activated);
+	void (*set_maximized)(struct sway_view *view, bool maximized);
 	void (*set_fullscreen)(struct sway_view *view, bool fullscreen);
+	bool (*wants_floating)(struct sway_view *view);
 	void (*for_each_surface)(struct sway_view *view,
 		wlr_surface_iterator_func_t iterator, void *user_data);
 	void (*close)(struct sway_view *view);
@@ -50,6 +52,10 @@ struct sway_view {
 	double x, y;
 	int width, height;
 
+	// The size the view would want to be if it weren't tiled.
+	// Used when changing a view from tiled to floating.
+	int natural_width, natural_height;
+
 	bool is_fullscreen;
 
 	char *title_format;
@@ -214,6 +220,8 @@ void view_autoconfigure(struct sway_view *view);
 
 void view_set_activated(struct sway_view *view, bool activated);
 
+void view_set_maximized(struct sway_view *view, bool maximized);
+
 void view_set_fullscreen_raw(struct sway_view *view, bool fullscreen);
 
 void view_set_fullscreen(struct sway_view *view, bool fullscreen);
@@ -236,7 +244,7 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface);
 
 void view_unmap(struct sway_view *view);
 
-void view_update_position(struct sway_view *view, double ox, double oy);
+void view_update_position(struct sway_view *view, double lx, double ly);
 
 void view_update_size(struct sway_view *view, int width, int height);
 

include/sway/tree/workspace.h

@@ -8,7 +8,7 @@ struct sway_view;
 struct sway_workspace {
 	struct sway_container *swayc;
 	struct sway_view *fullscreen;
-	list_t *floating;
+	struct sway_container *floating;
 };
 
 extern char *prev_workspace_name;
@@ -31,4 +31,6 @@ struct sway_container *workspace_prev(struct sway_container *current);
 
 bool workspace_is_visible(struct sway_container *ws);
 
+bool workspace_is_empty(struct sway_container *ws);
+
 #endif

sway/commands.c

@@ -190,6 +190,7 @@ static struct cmd_handler command_handlers[] = {
 	{ "splith", cmd_splith },
 	{ "splitt", cmd_splitt },
 	{ "splitv", cmd_splitv },
+	{ "sticky", cmd_sticky },
 	{ "swap", cmd_swap },
 	{ "title_format", cmd_title_format },
 	{ "unmark", cmd_unmark },

sway/commands/floating.c

@@ -31,31 +31,10 @@ struct cmd_results *cmd_floating(int argc, char **argv) {
 		wants_floating = !container->is_floating;
 	} else {
 		return cmd_results_new(CMD_FAILURE, "floating",
-			"Expected 'floating <enable|disable|toggle>");
+			"Expected 'floating <enable|disable|toggle>'");
 	}
 
-	// Change from tiled to floating
+	container_set_floating(container, wants_floating);
-	if (!container->is_floating && wants_floating) {
-		struct sway_container *workspace = container_parent(
-				container, C_WORKSPACE);
-		container_remove_child(container);
-		container_add_floating(workspace, container);
-
-		struct sway_output *output = workspace->parent->sway_output;
-		output_damage_whole_container(output, container);
-		// Reset to sane size and position
-		container->width = 640;
-		container->height = 480;
-		container->x = workspace->width / 2 - container->width / 2;
-		container->y = workspace->height / 2 - container->height / 2;
-		view_autoconfigure(container->sway_view);
-		output_damage_whole_container(output, container);
-
-		seat_set_focus(config->handler_context.seat, container);
-		arrange_workspace(workspace);
-	} else if (container->is_floating && !wants_floating) {
-		// TODO
-	}
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }

sway/commands/sticky.c

@@ -0,0 +1,40 @@
+#include <string.h>
+#include <strings.h>
+#include "sway/commands.h"
+#include "sway/input/seat.h"
+#include "sway/ipc-server.h"
+#include "sway/output.h"
+#include "sway/tree/arrange.h"
+#include "sway/tree/container.h"
+#include "sway/tree/layout.h"
+#include "sway/tree/view.h"
+#include "list.h"
+
+struct cmd_results *cmd_sticky(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "sticky", EXPECTED_EQUAL_TO, 1))) {
+		return error;
+	}
+	struct sway_container *container =
+		config->handler_context.current_container;
+	if (!container->is_floating) {
+		return cmd_results_new(CMD_FAILURE, "sticky",
+			"Can't set sticky on a tiled container");
+	}
+
+	bool wants_sticky;
+	if (strcasecmp(argv[0], "enable") == 0) {
+		wants_sticky = true;
+	} else if (strcasecmp(argv[0], "disable") == 0) {
+		wants_sticky = false;
+	} else if (strcasecmp(argv[0], "toggle") == 0) {
+		wants_sticky = !container->is_sticky;
+	} else {
+		return cmd_results_new(CMD_FAILURE, "sticky",
+			"Expected 'sticky <enable|disable|toggle>'");
+	}
+
+	container->is_sticky = wants_sticky;
+
+	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+}

sway/criteria.c

@@ -121,12 +121,15 @@ static bool criteria_matches_view(struct criteria *criteria,
 	}
 
 	if (criteria->floating) {
-		// TODO
+		if (!view->swayc->is_floating) {
 			return false;
 		}
+	}
 
 	if (criteria->tiling) {
-		// TODO
+		if (view->swayc->is_floating) {
+			return false;
+		}
 	}
 
 	if (criteria->urgent) {

sway/desktop/output.c

@@ -754,9 +754,87 @@ static void render_container(struct sway_output *output,
 	case L_TABBED:
 		render_container_tabbed(output, damage, con, parent_focused);
 		break;
-	case L_FLOATING:
+	}
-		// TODO
+}
-		break;
+
+static bool floater_intersects_output(struct sway_container *floater,
+		struct sway_container *output) {
+	struct wlr_box box = {
+		.x = floater->x,
+		.y = floater->y,
+		.width = floater->width,
+		.height = floater->height,
+	};
+	return wlr_output_layout_intersects(root_container.sway_root->output_layout,
+			output->sway_output->wlr_output, &box);
+}
+
+static void container_translate(struct sway_container *con, int x, int y) {
+	con->x += x;
+	con->y += y;
+	if (con->type == C_VIEW) {
+		con->sway_view->x += x;
+		con->sway_view->y += y;
+	} else {
+		for (int i = 0; i < con->children->length; ++i) {
+			struct sway_container *child = con->children->items[i];
+			container_translate(child, x, y);
+		}
+	}
+}
+
+static void render_floating_container(struct sway_output *soutput,
+		pixman_region32_t *damage, struct sway_container *con) {
+	// We need to translate the floating container's coordinates from layout
+	// coordinates into output-local coordinates. This needs to happen for all
+	// children of the floating container too.
+	struct sway_container *output = container_parent(con, C_OUTPUT);
+	container_translate(con, -output->x, -output->y);
+
+	if (con->type == C_VIEW) {
+		struct sway_view *view = con->sway_view;
+		struct sway_seat *seat = input_manager_current_seat(input_manager);
+		struct sway_container *focus = seat_get_focus(seat);
+		struct border_colors *colors;
+		struct wlr_texture *title_texture;
+		struct wlr_texture *marks_texture;
+
+		if (focus == con) {
+			colors = &config->border_colors.focused;
+			title_texture = con->title_focused;
+			marks_texture = view->marks_focused;
+		} else {
+			colors = &config->border_colors.unfocused;
+			title_texture = con->title_unfocused;
+			marks_texture = view->marks_unfocused;
+		}
+		render_titlebar(soutput, damage, con, con->x, con->y, con->width,
+				colors, title_texture, marks_texture);
+		render_view(soutput, damage, con, colors);
+	} else {
+		render_container(soutput, damage, con, false);
+	}
+	// Undo the translation
+	container_translate(con, output->x, output->y);
+}
+
+static void render_floating(struct sway_output *soutput,
+		pixman_region32_t *damage) {
+	for (int i = 0; i < root_container.children->length; ++i) {
+		struct sway_container *output = root_container.children->items[i];
+		for (int j = 0; j < output->children->length; ++j) {
+			struct sway_container *workspace = output->children->items[j];
+			struct sway_workspace *ws = workspace->sway_workspace;
+			bool ws_is_visible = workspace_is_visible(workspace);
+			for (int k = 0; k < ws->floating->children->length; ++k) {
+				struct sway_container *floater =
+					ws->floating->children->items[k];
+				if ((ws_is_visible || floater->is_sticky)
+						&& floater_intersects_output(floater, soutput->swayc)) {
+					render_floating_container(soutput, damage, floater);
+				}
+			}
+		}
 	}
 }
 
@@ -794,8 +872,6 @@ static void render_output(struct sway_output *output, struct timespec *when,
 		goto renderer_end;
 	}
 
-	//wlr_renderer_clear(renderer, (float[]){1, 1, 0, 1});
-
 	struct sway_container *workspace = output_get_active_workspace(output);
 
 	if (workspace->sway_workspace->fullscreen) {
@@ -818,7 +894,6 @@ static void render_output(struct sway_output *output, struct timespec *when,
 		}
 	} else {
 		float clear_color[] = {0.25f, 0.25f, 0.25f, 1.0f};
-		wlr_renderer_clear(renderer, clear_color);
 
 		int nrects;
 		pixman_box32_t *rects = pixman_region32_rectangles(damage, &nrects);
@@ -840,6 +915,8 @@ static void render_output(struct sway_output *output, struct timespec *when,
 			&root_container.sway_root->xwayland_unmanaged);
 		render_layer(output, damage,
 			&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP]);
+
+		render_floating(output, damage);
 	}
 	render_layer(output, damage,
 		&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY]);
@@ -916,6 +993,7 @@ static void send_frame_done(struct sway_output *output, struct timespec *when) {
 
 	struct sway_container *workspace = output_get_active_workspace(output);
 	send_frame_done_container(&data, workspace);
+	send_frame_done_container(&data, workspace->sway_workspace->floating);
 
 	send_frame_done_unmanaged(&data,
 		&root_container.sway_root->xwayland_unmanaged);
@@ -1037,7 +1115,15 @@ static void output_damage_view(struct sway_output *output,
 
 void output_damage_from_view(struct sway_output *output,
 		struct sway_view *view) {
+	if (container_self_or_parent_floating(view->swayc)) {
+		view->x -= output->swayc->x;
+		view->y -= output->swayc->y;
 		output_damage_view(output, view, false);
+		view->x += output->swayc->x;
+		view->y += output->swayc->y;
+	} else {
+		output_damage_view(output, view, false);
+	}
 }
 
 static void output_damage_whole_container_iterator(struct sway_container *con,
@@ -1053,13 +1139,17 @@ static void output_damage_whole_container_iterator(struct sway_container *con,
 
 void output_damage_whole_container(struct sway_output *output,
 		struct sway_container *con) {
-	float scale = output->wlr_output->scale;
 	struct wlr_box box = {
-		.x = con->x * scale,
+		.x = con->x,
-		.y = con->y * scale,
+		.y = con->y,
-		.width = con->width * scale,
+		.width = con->width,
-		.height = con->height * scale,
+		.height = con->height,
 	};
+	if (con->is_floating) {
+		box.x -= output->wlr_output->lx;
+		box.y -= output->wlr_output->ly;
+	}
+	scale_box(&box, output->wlr_output->scale);
 	wlr_output_damage_add_box(output->damage, &box);
 
 	if (con->type == C_VIEW) {

sway/desktop/xdg_shell.c

@@ -98,6 +98,7 @@ static void configure(struct sway_view *view, double ox, double oy, int width,
 	xdg_shell_view->pending_width = width;
 	xdg_shell_view->pending_height = height;
 	wlr_xdg_toplevel_set_size(view->wlr_xdg_surface, width, height);
+	view_update_position(view, ox, oy);
 }
 
 static void set_activated(struct sway_view *view, bool activated) {
@@ -110,6 +111,14 @@ static void set_activated(struct sway_view *view, bool activated) {
 	}
 }
 
+static void set_maximized(struct sway_view *view, bool maximized) {
+	if (xdg_shell_view_from_view(view) == NULL) {
+		return;
+	}
+	struct wlr_xdg_surface *surface = view->wlr_xdg_surface;
+	wlr_xdg_toplevel_set_maximized(surface, maximized);
+}
+
 static void set_fullscreen(struct sway_view *view, bool fullscreen) {
 	if (xdg_shell_view_from_view(view) == NULL) {
 		return;
@@ -118,6 +127,11 @@ static void set_fullscreen(struct sway_view *view, bool fullscreen) {
 	wlr_xdg_toplevel_set_fullscreen(surface, fullscreen);
 }
 
+static bool wants_floating(struct sway_view *view) {
+	// TODO
+	return false;
+}
+
 static void for_each_surface(struct sway_view *view,
 		wlr_surface_iterator_func_t iterator, void *user_data) {
 	if (xdg_shell_view_from_view(view) == NULL) {
@@ -154,7 +168,9 @@ static const struct sway_view_impl view_impl = {
 	.get_string_prop = get_string_prop,
 	.configure = configure,
 	.set_activated = set_activated,
+	.set_maximized = set_maximized,
 	.set_fullscreen = set_fullscreen,
+	.wants_floating = wants_floating,
 	.for_each_surface = for_each_surface,
 	.close = _close,
 	.destroy = destroy,
@@ -164,11 +180,17 @@ static void handle_commit(struct wl_listener *listener, void *data) {
 	struct sway_xdg_shell_view *xdg_shell_view =
 		wl_container_of(listener, xdg_shell_view, commit);
 	struct sway_view *view = &xdg_shell_view->view;
-	// NOTE: We intentionally discard the view's desired width here
+	struct wlr_box *geometry = &view->wlr_xdg_surface->geometry;
-	// TODO: Store this for restoration when moving to floating plane
+	if (!view->natural_width && !view->natural_height) {
-	// TODO: Let floating views do whatever
+		view->natural_width = geometry->width;
+		view->natural_height = geometry->height;
+	}
+	if (view->swayc && view->swayc->is_floating) {
+		view_update_size(view, geometry->width, geometry->height);
+	} else {
 		view_update_size(view, xdg_shell_view->pending_width,
 				xdg_shell_view->pending_height);
+	}
 	view_update_title(view, false);
 	view_damage_from(view);
 }

sway/desktop/xdg_shell_v6.c

@@ -97,6 +97,7 @@ static void configure(struct sway_view *view, double ox, double oy, int width,
 	xdg_shell_v6_view->pending_width = width;
 	xdg_shell_v6_view->pending_height = height;
 	wlr_xdg_toplevel_v6_set_size(view->wlr_xdg_surface_v6, width, height);
+	view_update_position(view, ox, oy);
 }
 
 static void set_activated(struct sway_view *view, bool activated) {
@@ -109,6 +110,14 @@ static void set_activated(struct sway_view *view, bool activated) {
 	}
 }
 
+static void set_maximized(struct sway_view *view, bool maximized) {
+	if (xdg_shell_v6_view_from_view(view) == NULL) {
+		return;
+	}
+	struct wlr_xdg_surface_v6 *surface = view->wlr_xdg_surface_v6;
+	wlr_xdg_toplevel_v6_set_maximized(surface, maximized);
+}
+
 static void set_fullscreen(struct sway_view *view, bool fullscreen) {
 	if (xdg_shell_v6_view_from_view(view) == NULL) {
 		return;
@@ -117,6 +126,11 @@ static void set_fullscreen(struct sway_view *view, bool fullscreen) {
 	wlr_xdg_toplevel_v6_set_fullscreen(surface, fullscreen);
 }
 
+static bool wants_floating(struct sway_view *view) {
+	// TODO
+	return false;
+}
+
 static void for_each_surface(struct sway_view *view,
 		wlr_surface_iterator_func_t iterator, void *user_data) {
 	if (xdg_shell_v6_view_from_view(view) == NULL) {
@@ -153,7 +167,9 @@ static const struct sway_view_impl view_impl = {
 	.get_string_prop = get_string_prop,
 	.configure = configure,
 	.set_activated = set_activated,
+	.set_maximized = set_maximized,
 	.set_fullscreen = set_fullscreen,
+	.wants_floating = wants_floating,
 	.for_each_surface = for_each_surface,
 	.close = _close,
 	.destroy = destroy,
@@ -163,11 +179,17 @@ static void handle_commit(struct wl_listener *listener, void *data) {
 	struct sway_xdg_shell_v6_view *xdg_shell_v6_view =
 		wl_container_of(listener, xdg_shell_v6_view, commit);
 	struct sway_view *view = &xdg_shell_v6_view->view;
-	// NOTE: We intentionally discard the view's desired width here
+	struct wlr_box *geometry = &view->wlr_xdg_surface_v6->geometry;
-	// TODO: Store this for restoration when moving to floating plane
+	if (!view->natural_width && !view->natural_height) {
-	// TODO: Let floating views do whatever
+		view->natural_width = geometry->width;
+		view->natural_height = geometry->height;
+	}
+	if (view->swayc && view->swayc->is_floating) {
+		view_update_size(view, geometry->width, geometry->height);
+	} else {
 		view_update_size(view, xdg_shell_v6_view->pending_width,
 				xdg_shell_v6_view->pending_height);
+	}
 	view_update_title(view, false);
 	view_damage_from(view);
 }

sway/desktop/xwayland.c

@@ -152,7 +152,9 @@ static uint32_t get_int_prop(struct sway_view *view, enum sway_view_prop prop) {
 	}
 }
 
-static void configure(struct sway_view *view, double ox, double oy, int width,
+// The x and y arguments are output-local for tiled views, and layout
+// coordinates for floating views.
+static void configure(struct sway_view *view, double x, double y, int width,
 		int height) {
 	struct sway_xwayland_view *xwayland_view = xwayland_view_from_view(view);
 	if (xwayland_view == NULL) {
@@ -160,6 +162,11 @@ static void configure(struct sway_view *view, double ox, double oy, int width,
 	}
 	struct wlr_xwayland_surface *xsurface = view->wlr_xwayland_surface;
 
+	double lx, ly;
+	if (view->swayc->is_floating) {
+		lx = x;
+		ly = y;
+	} else {
 		struct sway_container *output = container_parent(view->swayc, C_OUTPUT);
 		if (!sway_assert(output, "view must be within tree to set position")) {
 			return;
@@ -171,14 +178,17 @@ static void configure(struct sway_view *view, double ox, double oy, int width,
 		struct wlr_output_layout *layout = root->sway_root->output_layout;
 		struct wlr_output_layout_output *loutput =
 			wlr_output_layout_get(layout, output->sway_output->wlr_output);
-	if (!sway_assert(loutput, "output must be within layout to set position")) {
+		if (!sway_assert(loutput,
+					"output must be within layout to set position")) {
 			return;
 		}
+		lx = x + loutput->x;
+		ly = y + loutput->y;
+	}
 
 	xwayland_view->pending_width = width;
 	xwayland_view->pending_height = height;
-	wlr_xwayland_surface_configure(xsurface, ox + loutput->x, oy + loutput->y,
+	wlr_xwayland_surface_configure(xsurface, lx, ly, width, height);
-		width, height);
 }
 
 static void set_activated(struct sway_view *view, bool activated) {
@@ -189,6 +199,14 @@ static void set_activated(struct sway_view *view, bool activated) {
 	wlr_xwayland_surface_activate(surface, activated);
 }
 
+static void set_maximized(struct sway_view *view, bool maximized) {
+	if (xwayland_view_from_view(view) == NULL) {
+		return;
+	}
+	struct wlr_xwayland_surface *surface = view->wlr_xwayland_surface;
+	wlr_xwayland_surface_set_maximized(surface, maximized);
+}
+
 static void set_fullscreen(struct sway_view *view, bool fullscreen) {
 	if (xwayland_view_from_view(view) == NULL) {
 		return;
@@ -197,6 +215,35 @@ static void set_fullscreen(struct sway_view *view, bool fullscreen) {
 	wlr_xwayland_surface_set_fullscreen(surface, fullscreen);
 }
 
+static bool wants_floating(struct sway_view *view) {
+	// TODO:
+	// We want to return true if the window type contains any of these:
+	// NET_WM_WINDOW_TYPE_DIALOG
+	// NET_WM_WINDOW_TYPE_UTILITY
+	// NET_WM_WINDOW_TYPE_TOOLBAR
+	// NET_WM_WINDOW_TYPE_SPLASH
+	//
+	// We also want to return true if the NET_WM_STATE is MODAL.
+	// wlroots doesn't appear to provide all this information at the moment.
+	struct wlr_xwayland_surface *xsurface = view->wlr_xwayland_surface;
+	uint32_t *atom = xsurface->window_type;
+	for (size_t i = 0; i < xsurface->window_type_len; ++i) {
+		wlr_log(L_DEBUG, "xwayland window type %i", *atom);
+		// TODO: Come up with a better way of doing this
+		switch (*atom) {
+		case 36: // NET_WM_WINDOW_TYPE_UTILITY
+		case 44: // NET_WM_WINDOW_TYPE_SPLASH
+		case 276: // ? PGP passphrase dialog
+		case 337: // ? Firefox open file dialog
+		case 338: // ? Firefox open file dialog
+			return true;
+		}
+		++atom;
+	}
+
+	return false;
+}
+
 static void _close(struct sway_view *view) {
 	if (xwayland_view_from_view(view) == NULL) {
 		return;
@@ -225,7 +272,9 @@ static const struct sway_view_impl view_impl = {
 	.get_int_prop = get_int_prop,
 	.configure = configure,
 	.set_activated = set_activated,
+	.set_maximized = set_maximized,
 	.set_fullscreen = set_fullscreen,
+	.wants_floating = wants_floating,
 	.close = _close,
 	.destroy = destroy,
 };
@@ -234,10 +283,18 @@ static void handle_commit(struct wl_listener *listener, void *data) {
 	struct sway_xwayland_view *xwayland_view =
 		wl_container_of(listener, xwayland_view, commit);
 	struct sway_view *view = &xwayland_view->view;
-	// NOTE: We intentionally discard the view's desired width here
+	struct wlr_xwayland_surface *xsurface = view->wlr_xwayland_surface;
-	// TODO: Let floating views do whatever
+	if (!view->natural_width && !view->natural_height) {
+		view->natural_width = xsurface->width;
+		view->natural_height = xsurface->height;
+	}
+	if (view->swayc && view->swayc->is_floating) {
+		view_update_size(view, xsurface->width, xsurface->height);
+		view_update_position(view, xsurface->x, xsurface->y);
+	} else {
 		view_update_size(view, xwayland_view->pending_width,
 				xwayland_view->pending_height);
+	}
 	view_damage_from(view);
 }
 

sway/input/cursor.c

@@ -108,6 +108,9 @@ static struct sway_container *container_at_coords(
 	}
 
 	struct sway_container *c;
+	if ((c = floating_container_at(x, y, surface, sx, sy))) {
+		return c;
+	}
 	if ((c = container_at(ws, ox, oy, surface, sx, sy))) {
 		return c;
 	}

sway/input/seat.c

@@ -113,7 +113,14 @@ static void seat_send_focus(struct sway_container *con,
 
 static struct sway_container *seat_get_focus_by_type(struct sway_seat *seat,
 		struct sway_container *container, enum sway_container_type type) {
-	if (container->type == C_VIEW || container->children->length == 0) {
+	if (container->type == C_VIEW) {
+		return container;
+	}
+
+	struct sway_container *floating = container->type == C_WORKSPACE ?
+		container->sway_workspace->floating : NULL;
+	if (container->children->length == 0 &&
+			(!floating || floating->children->length == 0)) {
 		return container;
 	}
 
@@ -126,6 +133,9 @@ static struct sway_container *seat_get_focus_by_type(struct sway_seat *seat,
 		if (container_has_child(container, current->container)) {
 			return current->container;
 		}
+		if (floating && container_has_child(floating, current->container)) {
+			return current->container;
+		}
 	}
 
 	return NULL;
@@ -568,7 +578,7 @@ void seat_set_focus_warp(struct sway_seat *seat,
 	// clean up unfocused empty workspace on new output
 	if (new_output_last_ws) {
 		if (!workspace_is_visible(new_output_last_ws)
-				&& new_output_last_ws->children->length == 0) {
+				&& workspace_is_empty(new_output_last_ws)) {
 			if (last_workspace == new_output_last_ws) {
 				last_focus = NULL;
 				last_workspace = NULL;
@@ -581,7 +591,7 @@ void seat_set_focus_warp(struct sway_seat *seat,
 		if (last_workspace) {
 			ipc_event_workspace(last_workspace, container, "focus");
 			if (!workspace_is_visible(last_workspace)
-					&& last_workspace->children->length == 0) {
+					&& workspace_is_empty(last_workspace)) {
 				if (last_workspace == last_focus) {
 					last_focus = NULL;
 				}

sway/ipc-json.c

@@ -4,6 +4,7 @@
 #include "log.h"
 #include "sway/ipc-json.h"
 #include "sway/tree/container.h"
+#include "sway/tree/workspace.h"
 #include "sway/output.h"
 #include "sway/input/input-manager.h"
 #include "sway/input/seat.h"
@@ -150,6 +151,15 @@ static void ipc_json_describe_workspace(struct sway_container *workspace,
 
 	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();
+	struct sway_container *floating = workspace->sway_workspace->floating;
+	for (int i = 0; i < floating->children->length; ++i) {
+		struct sway_container *floater = floating->children->items[i];
+		json_object_array_add(floating_array, ipc_json_describe_container_recursive(floater));
+	}
+	json_object_object_add(object, "floating_nodes", floating_array);
 }
 
 static void ipc_json_describe_view(struct sway_container *c, json_object *object) {

sway/meson.build

@@ -65,6 +65,7 @@ sway_sources = files(
 	'commands/set.c',
 	'commands/show_marks.c',
 	'commands/split.c',
+	'commands/sticky.c',
 	'commands/swaybg_command.c',
 	'commands/swap.c',
 	'commands/title_format.c',

sway/tree/arrange.c

@@ -247,6 +247,18 @@ void arrange_children_of(struct sway_container *parent) {
 			arrange_children_of(child);
 		}
 	}
+
+	// If container is a workspace, process floating containers too
+	if (parent->type == C_WORKSPACE) {
+		struct sway_workspace *ws = workspace->sway_workspace;
+		for (int i = 0; i < ws->floating->children->length; ++i) {
+			struct sway_container *child = ws->floating->children->items[i];
+			if (child->type != C_VIEW) {
+				arrange_children_of(child);
+			}
+		}
+	}
+
 	container_damage_whole(parent);
 	update_debug_tree();
 }

sway/tree/container.c

@@ -123,6 +123,7 @@ struct sway_container *container_create(enum sway_container_type type) {
 	c->layout = L_NONE;
 	c->type = type;
 	c->alpha = 1.0f;
+	c->reapable = true;
 
 	if (type != C_VIEW) {
 		c->children = create_list();
@@ -189,14 +190,13 @@ static struct sway_container *container_workspace_destroy(
 	}
 
 	struct sway_container *parent = workspace->parent;
-	if (workspace->children->length == 0) {
+	if (workspace_is_empty(workspace)) {
-		// destroy the WS if there are no children (TODO check for floating)
+		// destroy the WS if there are no children
 		wlr_log(L_DEBUG, "destroying workspace '%s'", workspace->name);
 		ipc_event_workspace(workspace, NULL, "empty");
 	} else if (output) {
 		// Move children to a different workspace on this output
 		struct sway_container *new_workspace = NULL;
-		// TODO move floating
 		for (int i = 0; i < output->children->length; i++) {
 			if (output->children->items[i] != workspace) {
 				new_workspace = output->children->items[i];
@@ -209,6 +209,11 @@ static struct sway_container *container_workspace_destroy(
 		for (int i = 0; i < workspace->children->length; i++) {
 			container_move_to(workspace->children->items[i], new_workspace);
 		}
+		struct sway_container *floating = workspace->sway_workspace->floating;
+		for (int i = 0; i < floating->children->length; i++) {
+			container_move_to(floating->children->items[i],
+					new_workspace->sway_workspace->floating);
+		}
 	}
 
 	free(workspace->sway_workspace);
@@ -275,13 +280,16 @@ static void container_root_finish(struct sway_container *con) {
 }
 
 bool container_reap_empty(struct sway_container *con) {
+	if (!con->reapable) {
+		return false;
+	}
 	switch (con->type) {
 	case C_ROOT:
 	case C_OUTPUT:
 		// dont reap these
 		break;
 	case C_WORKSPACE:
-		if (!workspace_is_visible(con) && con->children->length == 0) {
+		if (!workspace_is_visible(con) && workspace_is_empty(con)) {
 			wlr_log(L_DEBUG, "Destroying workspace via reaper");
 			container_workspace_destroy(con);
 			return true;
@@ -436,7 +444,6 @@ struct sway_container *container_find(struct sway_container *container,
 	if (!container->children) {
 		return NULL;
 	}
-	// TODO: floating windows
 	for (int i = 0; i < container->children->length; ++i) {
 		struct sway_container *child = container->children->items[i];
 		if (test(child, data)) {
@@ -448,6 +455,9 @@ struct sway_container *container_find(struct sway_container *container,
 			}
 		}
 	}
+	if (container->type == C_WORKSPACE) {
+		return container_find(container->sway_workspace->floating, test, data);
+	}
 	return NULL;
 }
 
@@ -608,8 +618,6 @@ struct sway_container *container_at(struct sway_container *parent,
 		return container_at_tabbed(parent, ox, oy, surface, sx, sy);
 	case L_STACKED:
 		return container_at_stacked(parent, ox, oy, surface, sx, sy);
-	case L_FLOATING:
-		return NULL; // TODO
 	case L_NONE:
 		return NULL;
 	}
@@ -617,6 +625,34 @@ struct sway_container *container_at(struct sway_container *parent,
 	return NULL;
 }
 
+struct sway_container *floating_container_at(double lx, double ly,
+		struct wlr_surface **surface, double *sx, double *sy) {
+	for (int i = 0; i < root_container.children->length; ++i) {
+		struct sway_container *output = root_container.children->items[i];
+		for (int j = 0; j < output->children->length; ++j) {
+			struct sway_container *workspace = output->children->items[j];
+			struct sway_workspace *ws = workspace->sway_workspace;
+			bool ws_is_visible = workspace_is_visible(workspace);
+			for (int k = 0; k < ws->floating->children->length; ++k) {
+				struct sway_container *floater =
+					ws->floating->children->items[k];
+				if (ws_is_visible || floater->is_sticky) {
+					struct wlr_box box = {
+						.x = floater->x,
+						.y = floater->y,
+						.width = floater->width,
+						.height = floater->height,
+					};
+					if (wlr_box_contains_point(&box, lx, ly)) {
+						return container_at(floater, lx, ly, surface, sx, sy);
+					}
+				}
+			}
+		}
+	}
+	return NULL;
+}
+
 void container_for_each_descendant_dfs(struct sway_container *container,
 		void (*f)(struct sway_container *container, void *data),
 		void *data) {
@@ -674,7 +710,7 @@ static bool find_child_func(struct sway_container *con, void *data) {
 
 bool container_has_child(struct sway_container *con,
 		struct sway_container *child) {
-	if (con == NULL || con->type == C_VIEW || con->children->length == 0) {
+	if (con == NULL || con->type == C_VIEW) {
 		return false;
 	}
 	return container_find(con, find_child_func, child);
@@ -806,9 +842,6 @@ static size_t get_tree_representation(struct sway_container *parent, char *buffe
 	case L_STACKED:
 		lenient_strcat(buffer, "S[");
 		break;
-	case L_FLOATING:
-		lenient_strcat(buffer, "F[");
-		break;
 	case L_NONE:
 		lenient_strcat(buffer, "D[");
 		break;
@@ -866,3 +899,81 @@ void container_notify_subtree_changed(struct sway_container *container) {
 size_t container_titlebar_height() {
 	return config->font_height + TITLEBAR_V_PADDING * 2;
 }
+
+static void configure_floating_view(struct sway_view *view) {
+	struct sway_container *ws = container_parent(view->swayc, C_WORKSPACE);
+	int max_width = ws->width * 0.6666;
+	int max_height = ws->height * 0.6666;
+	int width =
+		view->natural_width > max_width ? max_width : view->natural_width;
+	int height =
+		view->natural_height > max_height ? max_height : view->natural_height;
+	struct sway_container *output = ws->parent;
+	int lx = output->x + (ws->width - width) / 2;
+	int ly = output->y + (ws->height - height) / 2;
+
+	view->border_left = view->border_right = view->border_bottom = true;
+	view_set_maximized(view, false);
+	view_configure(view, lx, ly, width, height);
+}
+
+void container_set_floating(struct sway_container *container, bool enable) {
+	if (container->is_floating == enable) {
+		return;
+	}
+
+	struct sway_container *workspace = container_parent(container, C_WORKSPACE);
+	struct sway_seat *seat = input_manager_current_seat(input_manager);
+	container_damage_whole(container);
+
+	if (enable) {
+		container_remove_child(container);
+		container_add_child(workspace->sway_workspace->floating, container);
+		container->is_floating = true;
+		if (container->type == C_VIEW) {
+			configure_floating_view(container->sway_view);
+		}
+		seat_set_focus(seat, seat_get_focus_inactive(seat, container));
+		container_reap_empty_recursive(workspace);
+	} else {
+		// Returning to tiled
+		container_remove_child(container);
+		container_add_child(workspace, container);
+		container->width = container->parent->width;
+		container->height = container->parent->height;
+		if (container->type == C_VIEW) {
+			view_set_maximized(container->sway_view, true);
+		}
+		container->is_floating = false;
+		container->is_sticky = false;
+		container_reap_empty_recursive(workspace->sway_workspace->floating);
+	}
+	arrange_workspace(workspace);
+	container_damage_whole(container);
+}
+
+void container_set_geometry_from_view(struct sway_container *container) {
+	if (!sway_assert(container->type == C_VIEW, "Expected a view")) {
+		return;
+	}
+	if (!sway_assert(container->is_floating, "Expected a floating view")) {
+		return;
+	}
+	struct sway_view *view = container->sway_view;
+	size_t border_width = view->border_thickness * (view->border != B_NONE);
+	size_t top =
+		view->border == B_NORMAL ? container_titlebar_height() : border_width;
+
+	container->x = view->x - border_width;
+	container->y = view->y - top;
+	container->width = view->width + border_width * 2;
+	container->height = top + view->height + border_width;
+}
+
+bool container_self_or_parent_floating(struct sway_container *container) {
+	while (container->parent->type != C_WORKSPACE
+			&& container->parent->parent->type != C_WORKSPACE) {
+		container = container->parent;
+	}
+	return container->is_floating;
+}

sway/tree/layout.c

@@ -45,20 +45,14 @@ void layout_init(void) {
 }
 
 static int index_child(const struct sway_container *child) {
-	// TODO handle floating
 	struct sway_container *parent = child->parent;
-	int i, len;
+	for (int i = 0; i < parent->children->length; ++i) {
-	len = parent->children->length;
-	for (i = 0; i < len; ++i) {
 		if (parent->children->items[i] == child) {
-			break;
-		}
-	}
-
-	if (!sway_assert(i < len, "Stray container")) {
-		return -1;
-	}
 			return i;
+		}
+	}
+	// This happens if the child is a floating container
+	return -1;
 }
 
 static void container_handle_fullscreen_reparent(struct sway_container *viewcon,
@@ -142,59 +136,28 @@ struct sway_container *container_remove_child(struct sway_container *child) {
 	}
 
 	struct sway_container *parent = child->parent;
-	if (!child->is_floating) {
 	for (int i = 0; i < parent->children->length; ++i) {
 		if (parent->children->items[i] == child) {
 			list_del(parent->children, i);
 			break;
 		}
 	}
-	} else {
-		if (!sway_assert(parent->type == C_WORKSPACE && child->type == C_VIEW,
-					"Found floating non-view and/or in non-workspace")) {
-			return parent;
-		}
-		struct sway_workspace *ws = parent->sway_workspace;
-		for (int i = 0; i < ws->floating->length; ++i) {
-			if (ws->floating->items[i] == child) {
-				list_del(ws->floating, i);
-				break;
-			}
-		}
-		child->is_floating = false;
-	}
 	child->parent = NULL;
 	container_notify_subtree_changed(parent);
 
 	return parent;
 }
 
-void container_add_floating(struct sway_container *workspace,
-		struct sway_container *child) {
-	if (!sway_assert(workspace->type == C_WORKSPACE && child->type == C_VIEW,
-				"Attempted to float non-view and/or in non-workspace")) {
-		return;
-	}
-	if (!sway_assert(!child->parent,
-				"child already has a parent (invalid call)")) {
-		return;
-	}
-	if (!sway_assert(!child->is_floating,
-				"child is already floating (invalid state)")) {
-		return;
-	}
-	struct sway_workspace *ws = workspace->sway_workspace;
-	list_add(ws->floating, child);
-	child->parent = workspace;
-	child->is_floating = true;
-}
-
 void container_move_to(struct sway_container *container,
 		struct sway_container *destination) {
 	if (container == destination
 			|| container_has_ancestor(container, destination)) {
 		return;
 	}
+	if (container->is_floating) {
+		// TODO
+		return;
+	}
 	struct sway_container *old_parent = container_remove_child(container);
 	container->width = container->height = 0;
 	container->saved_width = container->saved_height = 0;
@@ -207,8 +170,9 @@ void container_move_to(struct sway_container *container,
 	}
 	wl_signal_emit(&container->events.reparent, old_parent);
 	if (container->type == C_WORKSPACE) {
-		struct sway_seat *seat = input_manager_get_default_seat(
+		// If moving a workspace to a new output, maybe create a new workspace
-				input_manager);
+		// on the previous output
+		struct sway_seat *seat = input_manager_get_default_seat(input_manager);
 		if (old_parent->children->length == 0) {
 			char *ws_name = workspace_next_name(old_parent->name);
 			struct sway_container *ws =
@@ -754,6 +718,10 @@ struct sway_container *container_get_in_direction(
 		enum movement_direction dir) {
 	struct sway_container *parent = container->parent;
 
+	if (container->is_floating) {
+		return NULL;
+	}
+
 	if (container->type == C_VIEW && container->sway_view->is_fullscreen) {
 		if (dir == MOVE_PARENT || dir == MOVE_CHILD) {
 			return NULL;
@@ -778,6 +746,9 @@ struct sway_container *container_get_in_direction(
 		bool can_move = false;
 		int desired;
 		int idx = index_child(container);
+		if (idx == -1) {
+			return NULL;
+		}
 		if (parent->type == C_ROOT) {
 			enum wlr_direction wlr_dir = 0;
 			if (!sway_assert(sway_dir_to_wlr(dir, &wlr_dir),

sway/tree/view.c

@@ -158,7 +158,6 @@ void view_autoconfigure(struct sway_view *view) {
 
 	view->border_top = view->border_bottom = true;
 	view->border_left = view->border_right = true;
-	if (view->swayc->layout != L_FLOATING) {
 	if (config->hide_edge_borders == E_BOTH
 			|| config->hide_edge_borders == E_VERTICAL
 			|| (config->hide_edge_borders == E_SMART && !other_views)) {
@@ -173,7 +172,6 @@ void view_autoconfigure(struct sway_view *view) {
 		int bottom_y = view->swayc->y + view->swayc->height;
 		view->border_bottom = bottom_y != ws->y + ws->height;
 	}
-	}
 
 	double x, y, width, height;
 	x = y = width = height = 0;
@@ -184,11 +182,11 @@ void view_autoconfigure(struct sway_view *view) {
 	// disable any top border because we'll always have the title bar.
 	if (view->swayc->parent->layout == L_TABBED) {
 		y_offset = container_titlebar_height();
-		view->border_top = 0;
+		view->border_top = false;
 	} else if (view->swayc->parent->layout == L_STACKED) {
 		y_offset = container_titlebar_height()
 			* view->swayc->parent->children->length;
-		view->border_top = 0;
+		view->border_top = false;
 	}
 
 	switch (view->border) {
@@ -237,6 +235,12 @@ void view_set_activated(struct sway_view *view, bool activated) {
 	}
 }
 
+void view_set_maximized(struct sway_view *view, bool maximized) {
+	if (view->impl->set_maximized) {
+		view->impl->set_maximized(view, maximized);
+	}
+}
+
 // Set fullscreen, but without IPC events or arranging windows.
 void view_set_fullscreen_raw(struct sway_view *view, bool fullscreen) {
 	if (view->is_fullscreen == fullscreen) {
@@ -452,6 +456,11 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface) {
 			// TODO: CT_ASSIGN_OUTPUT
 		}
 	}
+	// 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 (focus->is_floating) {
+		focus = focus->parent->parent;
+	}
 	free(criterias);
 	cont = container_view_create(focus, view);
 
@@ -468,7 +477,12 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface) {
 	wl_signal_add(&view->swayc->events.reparent, &view->container_reparent);
 	view->container_reparent.notify = view_handle_container_reparent;
 
+	if (view->impl->wants_floating && view->impl->wants_floating(view)) {
+		container_set_floating(view->swayc, true);
+	} else {
 		arrange_children_of(cont->parent);
+	}
+
 	input_manager_set_focus(input_manager, cont);
 	if (workspace) {
 		workspace_switch(workspace);
@@ -516,16 +530,14 @@ void view_unmap(struct sway_view *view) {
 	}
 }
 
-void view_update_position(struct sway_view *view, double ox, double oy) {
+void view_update_position(struct sway_view *view, double lx, double ly) {
-	if (view->swayc->x == ox && view->swayc->y == oy) {
+	if (!view->swayc->is_floating) {
 		return;
 	}
-
-	// TODO: Only allow this if the view is floating (this function will only be
-	// called in response to wayland clients wanting to reposition themselves).
 	container_damage_whole(view->swayc);
-	view->swayc->x = ox;
+	view->x = lx;
-	view->swayc->y = oy;
+	view->y = ly;
+	container_set_geometry_from_view(view->swayc);
 	container_damage_whole(view->swayc);
 }
 
@@ -533,15 +545,15 @@ void view_update_size(struct sway_view *view, int width, int height) {
 	if (view->width == width && view->height == height) {
 		return;
 	}
-
 	container_damage_whole(view->swayc);
-	// Should we update the swayc width/height here too?
 	view->width = width;
 	view->height = height;
+	if (view->swayc->is_floating) {
+		container_set_geometry_from_view(view->swayc);
+	}
 	container_damage_whole(view->swayc);
 }
 
-
 static void view_subsurface_create(struct sway_view *view,
 		struct wlr_subsurface *subsurface) {
 	struct sway_view_child *child = calloc(1, sizeof(struct sway_view_child));
@@ -888,6 +900,19 @@ bool view_is_visible(struct sway_view *view) {
 	if (!view->swayc) {
 		return false;
 	}
+	struct sway_container *workspace =
+		container_parent(view->swayc, C_WORKSPACE);
+	// Determine if view is nested inside a floating container which is sticky.
+	// A simple floating view will have this ancestry:
+	// C_VIEW (is_floating=true) -> floating -> workspace
+	// A more complex ancestry could be:
+	// C_VIEW -> C_CONTAINER (tabbed and is_floating) -> 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 = floater->is_floating && 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;
@@ -901,10 +926,12 @@ bool view_is_visible(struct sway_view *view) {
 		container = container->parent;
 	}
 	// Check view isn't hidden by another fullscreen view
-	struct sway_container *workspace = container;
 	if (workspace->sway_workspace->fullscreen && !view->is_fullscreen) {
 		return false;
 	}
 	// Check the workspace is visible
+	if (!is_sticky) {
 		return workspace_is_visible(workspace);
+	}
+	return true;
 }

sway/tree/workspace.c

@@ -65,7 +65,9 @@ struct sway_container *workspace_create(struct sway_container *output,
 		return NULL;
 	}
 	swayws->swayc = workspace;
-	swayws->floating = create_list();
+	swayws->floating = container_create(C_CONTAINER);
+	swayws->floating->parent = swayws->swayc;
+	swayws->floating->reapable = false;
 	workspace->sway_workspace = swayws;
 
 	container_add_child(output, workspace);
@@ -408,3 +410,16 @@ bool workspace_is_visible(struct sway_container *ws) {
 	}
 	return focus == ws;
 }
+
+bool workspace_is_empty(struct sway_container *ws) {
+	if (!sway_assert(ws->type == C_WORKSPACE, "Expected a workspace")) {
+		return false;
+	}
+	if (ws->children->length) {
+		return false;
+	}
+	if (ws->sway_workspace->floating->children->length) {
+		return false;
+	}
+	return true;
+}