Automatically float xwayland windows

include/sway/server.h

@@ -11,7 +11,7 @@
 #include <wlr/types/wlr_xdg_shell.h>
 #include <wlr/render/wlr_renderer.h>
 // TODO WLR: make Xwayland optional
-#include <wlr/xwayland.h>
+#include "sway/xwayland.h"
 
 struct sway_server {
 	struct wl_display *wl_display;
@@ -37,12 +37,9 @@ struct sway_server {
 	struct wlr_xdg_shell *xdg_shell;
 	struct wl_listener xdg_shell_surface;
 
-	struct wlr_xwayland *xwayland;
-	struct wlr_xcursor_manager *xcursor_manager;
+	struct sway_xwayland xwayland;
 	struct wl_listener xwayland_surface;
-
-	struct wlr_wl_shell *wl_shell;
-	struct wl_listener wl_shell_surface;
+	struct wl_listener xwayland_ready;
 };
 
 struct sway_server server;

include/sway/xwayland.h

@@ -0,0 +1,25 @@
+#ifndef SWAY_XWAYLAND_H
+#define SWAY_XWAYLAND_H
+
+#include <wlr/xwayland.h>
+#include <xcb/xproto.h>
+
+enum atom_name {
+	NET_WM_WINDOW_TYPE_DIALOG,
+	NET_WM_WINDOW_TYPE_UTILITY,
+	NET_WM_WINDOW_TYPE_TOOLBAR,
+	NET_WM_WINDOW_TYPE_SPLASH,
+	NET_WM_STATE_MODAL,
+	ATOM_LAST,
+};
+
+struct sway_xwayland {
+	struct wlr_xwayland *wlr_xwayland;
+	struct wlr_xcursor_manager *xcursor_manager;
+
+	xcb_atom_t atoms[ATOM_LAST];
+};
+
+void handle_xwayland_ready(struct wl_listener *listener, void *data);
+
+#endif

meson.build

@@ -43,7 +43,8 @@ systemd        = dependency('libsystemd', required: false)
 elogind        = dependency('libelogind', required: false)
 math           = cc.find_library('m')
 rt             = cc.find_library('rt')
-git = find_program('git', required: false)
+xcb            = dependency('xcb')
+git            = find_program('git', required: false)
 
 conf_data = configuration_data()
 

sway/desktop/xwayland.c

@@ -15,6 +15,14 @@
 #include "sway/tree/layout.h"
 #include "sway/tree/view.h"
 
+static const char *atom_map[ATOM_LAST] = {
+	"_NET_WM_WINDOW_TYPE_DIALOG",
+	"_NET_WM_WINDOW_TYPE_UTILITY",
+	"_NET_WM_WINDOW_TYPE_TOOLBAR",
+	"_NET_WM_WINDOW_TYPE_SPLASH",
+	"_NET_WM_STATE_MODAL",
+};
+
 static void unmanaged_handle_request_configure(struct wl_listener *listener,
 		void *data) {
 	struct sway_xwayland_unmanaged *surface =
@@ -61,7 +69,8 @@ static void unmanaged_handle_map(struct wl_listener *listener, void *data) {
 
 	if (!wlr_xwayland_surface_is_unmanaged(xsurface)) {
 		struct sway_seat *seat = input_manager_current_seat(input_manager);
-		struct wlr_xwayland *xwayland = seat->input->server->xwayland;
+		struct wlr_xwayland *xwayland =
+			seat->input->server->xwayland.wlr_xwayland;
 		wlr_xwayland_set_seat(xwayland, seat->wlr_seat);
 		seat_set_focus_surface(seat, xsurface->surface);
 	}
@@ -199,15 +208,32 @@ static void set_fullscreen(struct sway_view *view, bool 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.
+	if (xwayland_view_from_view(view) == NULL) {
+		return false;
+	}
+	struct wlr_xwayland_surface *surface = view->wlr_xwayland_surface;
+	struct sway_xwayland *xwayland = &server.xwayland;
+
+	// TODO: return true if the NET_WM_STATE is MODAL
+
+	for (size_t i = 0; i < surface->window_type_len; ++i) {
+		xcb_atom_t type = surface->window_type[i];
+		if (type == xwayland->atoms[NET_WM_WINDOW_TYPE_DIALOG] ||
+				type == xwayland->atoms[NET_WM_WINDOW_TYPE_UTILITY] ||
+				type == xwayland->atoms[NET_WM_WINDOW_TYPE_TOOLBAR] ||
+				type == xwayland->atoms[NET_WM_WINDOW_TYPE_SPLASH]) {
+			return true;
+		}
+	}
+
+	struct wlr_xwayland_surface_size_hints *size_hints = surface->size_hints;
+	if (size_hints != NULL &&
+			size_hints->min_width != 0 && size_hints->min_height != 0 &&
+			size_hints->max_width == size_hints->min_width &&
+			size_hints->max_height == size_hints->min_height) {
+		return true;
+	}
+
 	return false;
 }
 
@@ -411,3 +437,40 @@ void handle_xwayland_surface(struct wl_listener *listener, void *data) {
 	wl_signal_add(&xsurface->events.map, &xwayland_view->map);
 	xwayland_view->map.notify = handle_map;
 }
+
+void handle_xwayland_ready(struct wl_listener *listener, void *data) {
+	struct sway_server *server =
+		wl_container_of(listener, server, xwayland_ready);
+	struct sway_xwayland *xwayland = &server->xwayland;
+
+	xcb_connection_t *xcb_conn = xcb_connect(NULL, NULL);
+	int err = xcb_connection_has_error(xcb_conn);
+	if (err) {
+		wlr_log(L_ERROR, "XCB connect failed: %d", err);
+		return;
+	}
+
+	xcb_intern_atom_cookie_t cookies[ATOM_LAST];
+	for (size_t i = 0; i < ATOM_LAST; i++) {
+		cookies[i] =
+			xcb_intern_atom(xcb_conn, 0, strlen(atom_map[i]), atom_map[i]);
+	}
+	for (size_t i = 0; i < ATOM_LAST; i++) {
+		xcb_generic_error_t *error = NULL;
+		xcb_intern_atom_reply_t *reply =
+			xcb_intern_atom_reply(xcb_conn, cookies[i], &error);
+		if (reply != NULL && error == NULL) {
+			xwayland->atoms[i] = reply->atom;
+		}
+		free(reply);
+
+		if (error != NULL) {
+			wlr_log(L_ERROR, "could not resolve atom %s, X11 error code %d",
+				atom_map[i], error->error_code);
+			free(error);
+			break;
+		}
+	}
+
+	xcb_disconnect(xcb_conn);
+}

sway/input/seat.c

@@ -99,7 +99,8 @@ static void seat_send_focus(struct sway_container *con,
 	if (con->type == C_VIEW
 			&& seat_is_input_allowed(seat, con->sway_view->surface)) {
 		if (con->sway_view->type == SWAY_VIEW_XWAYLAND) {
-			struct wlr_xwayland *xwayland = seat->input->server->xwayland;
+			struct wlr_xwayland *xwayland =
+				seat->input->server->xwayland.wlr_xwayland;
 			wlr_xwayland_set_seat(xwayland, seat->wlr_seat);
 		}
 		struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat->wlr_seat);

sway/meson.build

@@ -152,6 +152,7 @@ sway_deps = [
 	server_protos,
 	wayland_server,
 	wlroots,
+	xcb,
 	xkbcommon,
 ]
 

sway/server.c

@@ -18,12 +18,11 @@
 #include <wlr/types/wlr_xdg_output.h>
 #include <wlr/util/log.h>
 // TODO WLR: make Xwayland optional
-#include <wlr/xwayland.h>
 #include "sway/config.h"
 #include "sway/input/input-manager.h"
 #include "sway/server.h"
 #include "sway/tree/layout.h"
-
+#include "sway/xwayland.h"
 
 bool server_init(struct sway_server *server) {
 	wlr_log(L_DEBUG, "Initializing Wayland server");
@@ -72,20 +71,23 @@ bool server_init(struct sway_server *server) {
 	server->xdg_shell_surface.notify = handle_xdg_shell_surface;
 
 	// TODO make xwayland optional
-	server->xwayland =
+	server->xwayland.wlr_xwayland =
 		wlr_xwayland_create(server->wl_display, server->compositor, true);
-	wl_signal_add(&server->xwayland->events.new_surface,
+	wl_signal_add(&server->xwayland.wlr_xwayland->events.new_surface,
 		&server->xwayland_surface);
 	server->xwayland_surface.notify = handle_xwayland_surface;
+	wl_signal_add(&server->xwayland.wlr_xwayland->events.ready,
+		&server->xwayland_ready);
+	server->xwayland_ready.notify = handle_xwayland_ready;
 
 	// TODO: configurable cursor theme and size
-	server->xcursor_manager = wlr_xcursor_manager_create(NULL, 24);
-	wlr_xcursor_manager_load(server->xcursor_manager, 1);
+	server->xwayland.xcursor_manager = wlr_xcursor_manager_create(NULL, 24);
+	wlr_xcursor_manager_load(server->xwayland.xcursor_manager, 1);
 	struct wlr_xcursor *xcursor = wlr_xcursor_manager_get_xcursor(
-		server->xcursor_manager, "left_ptr", 1);
+		server->xwayland.xcursor_manager, "left_ptr", 1);
 	if (xcursor != NULL) {
 		struct wlr_xcursor_image *image = xcursor->images[0];
-		wlr_xwayland_set_cursor(server->xwayland, image->buffer,
+		wlr_xwayland_set_cursor(server->xwayland.wlr_xwayland, image->buffer,
 			image->width * 4, image->width, image->height, image->hotspot_x,
 			image->hotspot_y);
 	}