action: add ToggleAlwaysOnBottom

docs/labwc-actions.5.scd

@@ -80,6 +80,13 @@ Actions are used in menus and keyboard/mouse bindings.
 *<action name="ToggleAlwaysOnTop">*
 	Toggle always-on-top of focused window.
 
+*<action name="ToggleAlwaysOnBottom">*
+	Toggle bewteen layers 'always-on-bottom' and 'normal'. When a window is
+	in the 'always-on-bottom' layer, it is rendered below all other
+	top-level windows. It is anticipated that this action will be useful
+	when defining window-rules for desktop-management tools that do not
+	support the wlr-layer-shell protocol.
+
 *<action name="ToggleKeybinds">*
 	Stop handling keybinds other than ToggleKeybinds itself.
 	This can be used to allow A-Tab and similar keybinds to be delivered

include/labwc.h

@@ -263,6 +263,7 @@ struct server {
 
 	/* Tree for all non-layer xdg/xwayland-shell surfaces with always-on-top/below */
 	struct wlr_scene_tree *view_tree_always_on_top;
+	struct wlr_scene_tree *view_tree_always_on_bottom;
 #if HAVE_XWAYLAND
 	/* Tree for unmanaged xsurfaces without initialized view (usually popups) */
 	struct wlr_scene_tree *unmanaged_tree;

include/view.h

@@ -171,8 +171,11 @@ void view_maximize(struct view *view, bool maximize,
 void view_set_fullscreen(struct view *view, bool fullscreen);
 void view_toggle_maximize(struct view *view);
 void view_toggle_decorations(struct view *view);
-void view_toggle_always_on_top(struct view *view);
+
 bool view_is_always_on_top(struct view *view);
+void view_toggle_always_on_top(struct view *view);
+void view_toggle_always_on_bottom(struct view *view);
+
 bool view_is_tiled(struct view *view);
 bool view_is_floating(struct view *view);
 void view_move_to_workspace(struct view *view, struct workspace *workspace);

src/action.c

@@ -61,6 +61,7 @@ enum action_type {
 	ACTION_TYPE_TOGGLE_FULLSCREEN,
 	ACTION_TYPE_TOGGLE_DECORATIONS,
 	ACTION_TYPE_TOGGLE_ALWAYS_ON_TOP,
+	ACTION_TYPE_TOGGLE_ALWAYS_ON_BOTTOM,
 	ACTION_TYPE_FOCUS,
 	ACTION_TYPE_ICONIFY,
 	ACTION_TYPE_MOVE,
@@ -93,6 +94,7 @@ const char *action_names[] = {
 	"ToggleFullscreen",
 	"ToggleDecorations",
 	"ToggleAlwaysOnTop",
+	"ToggleAlwaysOnBottom",
 	"Focus",
 	"Iconify",
 	"Move",
@@ -519,6 +521,11 @@ actions_run(struct view *activator, struct server *server,
 				view_toggle_always_on_top(view);
 			}
 			break;
+		case ACTION_TYPE_TOGGLE_ALWAYS_ON_BOTTOM:
+			if (view) {
+				view_toggle_always_on_bottom(view);
+			}
+			break;
 		case ACTION_TYPE_FOCUS:
 			if (view) {
 				desktop_focus_and_activate_view(&server->seat, view);

src/server.c

@@ -307,6 +307,7 @@ server_init(struct server *server)
 	 * | layer-shell       | background-layer | Yes        | swaybg
 	 */
 
+	server->view_tree_always_on_bottom = wlr_scene_tree_create(&server->scene->tree);
 	server->view_tree = wlr_scene_tree_create(&server->scene->tree);
 	server->view_tree_always_on_top = wlr_scene_tree_create(&server->scene->tree);
 	server->xdg_popup_tree = wlr_scene_tree_create(&server->scene->tree);

src/view-impl-common.c

@@ -27,13 +27,13 @@ view_impl_move_to_back(struct view *view)
 void
 view_impl_map(struct view *view)
 {
-	if (!view->been_mapped) {
-		window_rules_apply(view, LAB_WINDOW_RULE_EVENT_ON_FIRST_MAP);
-	}
 	desktop_focus_and_activate_view(&view->server->seat, view);
 	view_move_to_front(view);
 	view_update_title(view);
 	view_update_app_id(view);
+	if (!view->been_mapped) {
+		window_rules_apply(view, LAB_WINDOW_RULE_EVENT_ON_FIRST_MAP);
+	}
 }
 
 static bool

src/view.c

@@ -627,6 +627,28 @@ view_toggle_always_on_top(struct view *view)
 	}
 }
 
+static bool
+view_is_always_on_bottom(struct view *view)
+{
+	assert(view);
+	return view->scene_tree->node.parent ==
+		view->server->view_tree_always_on_bottom;
+}
+
+void
+view_toggle_always_on_bottom(struct view *view)
+{
+	assert(view);
+	if (view_is_always_on_bottom(view)) {
+		view->workspace = view->server->workspace_current;
+		wlr_scene_node_reparent(&view->scene_tree->node,
+			view->workspace->tree);
+	} else {
+		wlr_scene_node_reparent(&view->scene_tree->node,
+			view->server->view_tree_always_on_bottom);
+	}
+}
+
 void
 view_move_to_workspace(struct view *view, struct workspace *workspace)
 {