Support (fallback) app menu in SSD

We now allow "appmenu" in the button layout to make synchronizing it
with GTK+'s client-side decorations easier, but as some people tweak
their settings to get in-window app menus even when using the shell,
actually pop up the app menu when the button is activated.

https://bugzilla.gnome.org/show_bug.cgi?id=730752

js/ui/windowManager.js

@@ -1163,8 +1163,8 @@ const WindowManager = new Lang.Class({
         this._tilePreview.hide();
     },
 
-    _showWindowMenu: function(shellwm, window, x, y) {
+    _showWindowMenu: function(shellwm, window, menu, x, y) {
-        this._windowMenuManager.showForWindow(window, x, y);
+        this._windowMenuManager.showWindowMenuForWindow(window, menu, x, y);
     },
 
     _startAppSwitcher : function(display, screen, window, binding) {

js/ui/windowMenu.js

@@ -9,6 +9,7 @@ const Shell = imports.gi.Shell;
 const BoxPointer = imports.ui.boxpointer;
 const Main = imports.ui.main;
 const PopupMenu = imports.ui.popupMenu;
+const RemoteMenu = imports.ui.remoteMenu;
 
 const WindowMenu = new Lang.Class({
     Name: 'WindowMenu',
@@ -122,6 +123,22 @@ const WindowMenu = new Lang.Class({
     }
 });
 
+const AppMenu = new Lang.Class({
+    Name: 'AppMenu',
+    Extends: RemoteMenu.RemoteMenu,
+
+    _init: function(window) {
+        let app = Shell.WindowTracker.get_default().get_window_app(window);
+
+        this.parent(Main.layoutManager.dummyCursor, app.menu, app.action_group);
+
+        this.actor.add_style_class_name('fallback-app-menu');
+
+        Main.layoutManager.uiGroup.add_actor(this.actor);
+        this.actor.hide();
+    }
+});
+
 const WindowMenuManager = new Lang.Class({
     Name: 'WindowMenuManager',
 
@@ -129,8 +146,10 @@ const WindowMenuManager = new Lang.Class({
         this._manager = new PopupMenu.PopupMenuManager({ actor: Main.layoutManager.dummyCursor });
     },
 
-    showForWindow: function(window, x, y) {
+    showWindowMenuForWindow: function(window, type, x, y) {
-        let menu = new WindowMenu(window);
+        let menu = (type == Meta.WindowMenuType.WM) ? new WindowMenu(window)
+                                                    : new AppMenu(window);
+
         this._manager.addMenu(menu);
 
         Main.layoutManager.setDummyCursorGeometry(x, y, 0, 0);
@@ -140,5 +159,5 @@ const WindowMenuManager = new Lang.Class({
             if (!isOpen)
                 menu.destroy();
         }));
-    },
+    }
 });

src/gnome-shell-plugin.c

@@ -75,6 +75,7 @@ static void gnome_shell_plugin_show_tile_preview (MetaPlugin      *plugin,
 static void gnome_shell_plugin_hide_tile_preview (MetaPlugin *plugin);
 static void gnome_shell_plugin_show_window_menu  (MetaPlugin         *plugin,
                                                   MetaWindow         *window,
+                                                  MetaWindowMenuType  menu,
                                                   int                 x,
                                                   int                 y);
 
@@ -310,10 +311,11 @@ gnome_shell_plugin_hide_tile_preview (MetaPlugin *plugin)
 static void
 gnome_shell_plugin_show_window_menu (MetaPlugin         *plugin,
                                      MetaWindow         *window,
+                                     MetaWindowMenuType  menu,
                                      int                 x,
                                      int                 y)
 {
-  _shell_wm_show_window_menu (get_shell_wm (), window, x, y);
+  _shell_wm_show_window_menu (get_shell_wm (), window, menu, x, y);
 }
 
 static gboolean

src/shell-wm-private.h

@@ -42,6 +42,7 @@ void _shell_wm_show_tile_preview     (ShellWM             *wm,
 void _shell_wm_hide_tile_preview     (ShellWM             *wm);
 void _shell_wm_show_window_menu      (ShellWM             *wm,
                                       MetaWindow          *window,
+                                      MetaWindowMenuType   menu,
                                       int                  x,
                                       int                  y);
 

src/shell-wm.c

@@ -141,8 +141,8 @@ shell_wm_class_init (ShellWMClass *klass)
                   G_TYPE_FROM_CLASS (klass),
                   G_SIGNAL_RUN_LAST,
                   0, NULL, NULL, NULL,
-                  G_TYPE_NONE, 3,
+                  G_TYPE_NONE, 4,
-                  META_TYPE_WINDOW, G_TYPE_INT, G_TYPE_INT);
+                  META_TYPE_WINDOW, G_TYPE_INT, G_TYPE_INT, G_TYPE_INT);
   shell_wm_signals[FILTER_KEYBINDING] =
     g_signal_new ("filter-keybinding",
                   G_TYPE_FROM_CLASS (klass),
@@ -299,10 +299,11 @@ _shell_wm_hide_tile_preview (ShellWM *wm)
 void
 _shell_wm_show_window_menu (ShellWM            *wm,
                             MetaWindow         *window,
+                            MetaWindowMenuType  menu,
                             int                 x,
                             int                 y)
 {
-  g_signal_emit (wm, shell_wm_signals[SHOW_WINDOW_MENU], 0, window, x, y);
+  g_signal_emit (wm, shell_wm_signals[SHOW_WINDOW_MENU], 0, window, menu, x, y);
 }
 
 void