Load _DBUS_APPLICATION_ID property, expose it via API

This is used to associate GtkApplication -> X window, and will
be consumed by gnome-shell.

https://bugzilla.gnome.org/show_bug.cgi?id=664851

src/core/window-private.h

@@ -97,9 +97,11 @@ struct _MetaWindow
   char *role;
   char *sm_client_id;
   char *wm_client_machine;
+
   char *startup_id;
   char *mutter_hints;
   char *gtk_theme_variant;
+  char *dbus_application_id;
 
   int net_wm_pid;
   

src/core/window-props.c

@@ -1592,6 +1592,30 @@ reload_gtk_theme_variant (MetaWindow    *window,
     }
 }
 
+static void
+reload_dbus_application_id (MetaWindow    *window,
+                            MetaPropValue *value,
+                            gboolean       initial)
+{
+  char *new_id = NULL;
+  char *current_id = window->dbus_application_id;
+
+  if (value->type != META_PROP_VALUE_INVALID)
+    new_id = value->v.str;
+
+  if (g_strcmp0 (new_id, current_id))
+    {
+      g_free (current_id);
+
+      if (new_id)
+        window->dbus_application_id = g_strdup (new_id);
+      else
+        window->dbus_application_id = NULL;
+
+      g_object_notify ((GObject*)window, "dbus-application-id");
+    }
+}
+
 /**
  * Initialises the property hooks system.  Each row in the table named "hooks"
  * represents an action to take when a property is found on a newly-created
@@ -1645,6 +1669,7 @@ meta_display_init_window_prop_hooks (MetaDisplay *display)
     { display->atom__MOTIF_WM_HINTS,   META_PROP_VALUE_MOTIF_HINTS, reload_mwm_hints,      TRUE,  FALSE },
     { XA_WM_TRANSIENT_FOR,             META_PROP_VALUE_WINDOW,    reload_transient_for,    TRUE,  FALSE },
     { display->atom__GTK_THEME_VARIANT, META_PROP_VALUE_UTF8,     reload_gtk_theme_variant, TRUE, FALSE },
+    { display->atom__DBUS_APPLICATION_ID, META_PROP_VALUE_UTF8,   reload_dbus_application_id, TRUE, FALSE },
     { display->atom__NET_WM_USER_TIME_WINDOW, META_PROP_VALUE_WINDOW, reload_net_wm_user_time_window, TRUE, FALSE },
     { display->atom_WM_STATE,          META_PROP_VALUE_INVALID,  NULL,                     FALSE, FALSE },
     { display->atom__NET_WM_ICON,      META_PROP_VALUE_INVALID,  reload_net_wm_icon,       FALSE, FALSE },

src/core/window.c

@@ -164,7 +164,8 @@ enum {
   PROP_APPEARS_FOCUSED,
   PROP_RESIZEABLE,
   PROP_ABOVE,
-  PROP_WM_CLASS
+  PROP_WM_CLASS,
+  PROP_DBUS_APPLICATION_ID
 };
 
 enum
@@ -221,6 +222,7 @@ meta_window_finalize (GObject *object)
   g_free (window->icon_name);
   g_free (window->desc);
   g_free (window->gtk_theme_variant);
+  g_free (window->dbus_application_id);
 }
 
 static void
@@ -284,6 +286,9 @@ meta_window_get_property(GObject         *object,
     case PROP_ABOVE:
       g_value_set_boolean (value, win->wm_state_above);
       break;
+    case PROP_DBUS_APPLICATION_ID:
+      g_value_set_string (value, win->dbus_application_id);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
@@ -450,6 +455,14 @@ meta_window_class_init (MetaWindowClass *klass)
                                                         NULL,
                                                         G_PARAM_READABLE));
 
+  g_object_class_install_property (object_class,
+                                   PROP_DBUS_APPLICATION_ID,
+                                   g_param_spec_string ("dbus-application-id",
+                                                        "_DBUS_APPLICATION_ID",
+                                                        "Contents of the _DBUS_APPLICATION_ID property of this window",
+                                                        NULL,
+                                                        G_PARAM_READABLE));
+
   window_signals[WORKSPACE_CHANGED] =
     g_signal_new ("workspace-changed",
                   G_TYPE_FROM_CLASS (object_class),
@@ -10211,6 +10224,18 @@ meta_window_get_wm_class_instance (MetaWindow *window)
   return window->res_name;
 }
 
+/**
+ * meta_window_get_dbus_application_id:
+ * @window: a #MetaWindow
+ *
+ * Return value: (transfer none): the application ID
+ **/
+const char *
+meta_window_get_dbus_application_id (MetaWindow *window)
+{
+  return window->dbus_application_id;
+}
+
 /**
  * meta_window_get_compositor_private:
  * @window: a #MetaWindow

src/meta/atomnames.h

@@ -59,6 +59,7 @@ item(_MUTTER_SET_KEYBINDINGS_MESSAGE)
 item(_MUTTER_TOGGLE_VERBOSE)
 item(_MUTTER_HINTS)
 item(_GTK_THEME_VARIANT)
+item(_DBUS_APPLICATION_ID)
 item(_GNOME_WM_KEYBINDINGS)
 item(_GNOME_PANEL_ACTION)
 item(_GNOME_PANEL_ACTION_MAIN_MENU)

src/meta/window.h

@@ -95,6 +95,8 @@ const char * meta_window_get_wm_class (MetaWindow *window);
 const char * meta_window_get_wm_class_instance (MetaWindow *window);
 gboolean    meta_window_showing_on_its_workspace (MetaWindow *window);
 
+const char * meta_window_get_dbus_application_id (MetaWindow *window);
+
 void meta_window_move(MetaWindow *window, gboolean user_op, int root_x_nw, int root_y_nw);
 void meta_window_move_frame(MetaWindow *window, gboolean user_op, int root_x_nw, int root_y_nw);
 void meta_window_move_resize_frame (MetaWindow *window, gboolean user_op, int root_x_nw, int root_y_nw, int w, int h);