view: add state change signals

include/view.h

@@ -286,6 +286,16 @@ struct view {
 	struct wl_listener request_maximize;
 	struct wl_listener request_fullscreen;
 	struct wl_listener set_title;
+
+	struct {
+		struct wl_signal new_app_id;
+		struct wl_signal new_title;
+		struct wl_signal new_outputs;
+		struct wl_signal maximized;
+		struct wl_signal minimized;
+		struct wl_signal fullscreened;
+		struct wl_signal activated;     /* bool *activated */
+	} events;
 };
 
 struct view_query {
@@ -580,6 +590,8 @@ void view_adjust_size(struct view *view, int *w, int *h);
 void view_evacuate_region(struct view *view);
 void view_on_output_destroy(struct view *view);
 void view_connect_map(struct view *view, struct wlr_surface *surface);
+
+void view_init(struct view *view);
 void view_destroy(struct view *view);
 
 enum view_axis view_axis_parse(const char *direction);

src/view.c

@@ -474,6 +474,8 @@ view_set_activated(struct view *view, bool activated)
 			view->toplevel.handle, activated);
 	}
 
+	wl_signal_emit_mutable(&view->events.activated, &activated);
+
 	if (rc.kb_layout_per_window) {
 		if (!activated) {
 			/* Store configured keyboard layout per view */
@@ -530,6 +532,7 @@ view_update_outputs(struct view *view)
 		if (view->toplevel.handle) {
 			foreign_toplevel_update_outputs(view);
 		}
+		wl_signal_emit_mutable(&view->events.new_outputs, NULL);
 		desktop_update_top_layer_visiblity(view->server);
 	}
 }
@@ -742,7 +745,10 @@ _minimize(struct view *view, bool minimized)
 	if (view->impl->minimize) {
 		view->impl->minimize(view, minimized);
 	}
+
 	view->minimized = minimized;
+	wl_signal_emit_mutable(&view->events.minimized, NULL);
+
 	if (minimized) {
 		view->impl->unmap(view, /* client_request */ false);
 	} else {
@@ -1310,7 +1316,9 @@ set_maximized(struct view *view, enum view_axis maximized)
 		wlr_foreign_toplevel_handle_v1_set_maximized(
 			view->toplevel.handle, (maximized == VIEW_AXIS_BOTH));
 	}
+
 	view->maximized = maximized;
+	wl_signal_emit_mutable(&view->events.maximized, NULL);
 
 	/*
 	 * Ensure that follow-up actions like SnapToEdge / SnapToRegion
@@ -1672,7 +1680,9 @@ set_fullscreen(struct view *view, bool fullscreen)
 		wlr_foreign_toplevel_handle_v1_set_fullscreen(
 			view->toplevel.handle, fullscreen);
 	}
+
 	view->fullscreen = fullscreen;
+	wl_signal_emit_mutable(&view->events.fullscreened, NULL);
 
 	/* Re-show decorations when no longer fullscreen */
 	if (!fullscreen && view->ssd_enabled) {
@@ -2332,6 +2342,7 @@ view_update_title(struct view *view)
 	}
 	ssd_update_title(view->ssd);
 	wlr_foreign_toplevel_handle_v1_set_title(view->toplevel.handle, title);
+	wl_signal_emit_mutable(&view->events.new_title, NULL);
 }
 
 void
@@ -2348,6 +2359,8 @@ view_update_app_id(struct view *view)
 	if (view->ssd_enabled) {
 		ssd_update_window_icon(view->ssd);
 	}
+
+	wl_signal_emit_mutable(&view->events.new_app_id, NULL);
 }
 
 void
@@ -2465,6 +2478,20 @@ view_set_shade(struct view *view, bool shaded)
 	}
 }
 
+void
+view_init(struct view *view)
+{
+	assert(view);
+
+	wl_signal_init(&view->events.new_app_id);
+	wl_signal_init(&view->events.new_title);
+	wl_signal_init(&view->events.new_outputs);
+	wl_signal_init(&view->events.maximized);
+	wl_signal_init(&view->events.minimized);
+	wl_signal_init(&view->events.fullscreened);
+	wl_signal_init(&view->events.activated);
+}
+
 void
 view_destroy(struct view *view)
 {

src/xdg.c

@@ -976,6 +976,7 @@ xdg_toplevel_new(struct wl_listener *listener, void *data)
 	CONNECT_SIGNAL(toplevel, xdg_toplevel_view, request_show_window_menu);
 	CONNECT_SIGNAL(xdg_surface, xdg_toplevel_view, new_popup);
 
+	view_init(view);
 	wl_list_insert(&server->views, &view->link);
 }
 

src/xwayland.c

@@ -1007,6 +1007,7 @@ xwayland_view_create(struct server *server,
 	CONNECT_SIGNAL(xsurface, xwayland_view, set_window_type);
 	CONNECT_SIGNAL(xsurface, xwayland_view, map_request);
 
+	view_init(view);
 	wl_list_insert(&view->server->views, &view->link);
 
 	if (xsurface->surface) {