From 22fb11bd6b8b4dca696e16baf6619c50399abd14 Mon Sep 17 00:00:00 2001
From: Charles Kerr <charles.kerr@canonical.com>
Date: Wed, 19 Jun 2013 01:26:32 -0500
Subject: in the gnome control center datetime panel, use g_bus_watch_name() to
 see if com.canonical.indicator.datetime is available.

---
 src/datetime-prefs.c | 55 ++++++++++++++++++++++++++++------------------------
 1 file changed, 30 insertions(+), 25 deletions(-)

(limited to 'src/datetime-prefs.c')

diff --git a/src/datetime-prefs.c b/src/datetime-prefs.c
index d7f0def..ef0a553 100644
--- a/src/datetime-prefs.c
+++ b/src/datetime-prefs.c
@@ -58,6 +58,7 @@ struct _IndicatorDatetimePanel
 
 struct _IndicatorDatetimePanelPrivate
 {
+  guint                name_watch_id;
   GtkBuilder *         builder;
   GDBusProxy *         proxy;
   GtkWidget *          auto_radio;
@@ -286,33 +287,30 @@ proxy_ready (GObject *object, GAsyncResult *res, IndicatorDatetimePanel * self)
     }
 }
 
+#define WIG(name) GTK_WIDGET (gtk_builder_get_object(self->priv->builder, name))
+
 static void
-service_name_owner_changed (GDBusProxy * proxy, GParamSpec *pspec, gpointer user_data)
+set_show_clock_check_sensitive (IndicatorDatetimePanel  * self,
+                                gboolean                  sensitive)
 {
-  GtkWidget * widget = GTK_WIDGET (user_data);
-  gchar * owner = g_dbus_proxy_get_name_owner (proxy);
-
-  gtk_widget_set_sensitive (widget, (owner != NULL));
-
-  g_free (owner);
+  gtk_widget_set_sensitive (WIG("showClockCheck"), sensitive);
 }
 
 static void
-service_proxy_ready (GObject *object, GAsyncResult *res, gpointer user_data)
+on_bus_name_appeared (GDBusConnection * connection   G_GNUC_UNUSED,
+                      const char      * name         G_GNUC_UNUSED,
+                      const char      * name_owner,
+                      gpointer          self)
 {
-  GError * error = NULL;
-
-  GDBusProxy * proxy = g_dbus_proxy_new_for_bus_finish (res, &error);
-
-  if (error != NULL) {
-    g_critical("Could not grab DBus proxy for indicator-datetime-service: %s", error->message);
-    g_error_free(error);
-    return;
-  }
+  set_show_clock_check_sensitive (self, name_owner && *name_owner);
+}
 
-  /* And now, do initial proxy configuration */
-  g_signal_connect (proxy, "notify::g-name-owner", G_CALLBACK (service_name_owner_changed), user_data);
-  service_name_owner_changed (proxy, NULL, user_data);
+static void
+on_bus_name_vanished (GDBusConnection * connection   G_GNUC_UNUSED,
+                      const char      * name         G_GNUC_UNUSED,
+                      gpointer          self)
+{
+  set_show_clock_check_sensitive (self, FALSE);
 }
 
 static gboolean
@@ -656,7 +654,6 @@ indicator_datetime_panel_init (IndicatorDatetimePanel * self)
 
   GSettings * conf = g_settings_new (SETTINGS_INTERFACE);
 
-#define WIG(name) GTK_WIDGET (gtk_builder_get_object (self->priv->builder, name))
 
   /* Add policykit button */
   GtkWidget * polkit_button = gtk_lock_button_new (NULL);
@@ -745,10 +742,13 @@ indicator_datetime_panel_init (IndicatorDatetimePanel * self)
      but that doesn't yet claim a name on the bus.  Presumably the service
      would have been started by any such indicator, so this will at least tell
      us if there *was* a datetime module run this session. */
-  g_dbus_proxy_new_for_bus (G_BUS_TYPE_SESSION, G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START, NULL,
-                            SERVICE_NAME, SERVICE_OBJ, SERVICE_IFACE,
-                            NULL, (GAsyncReadyCallback)service_proxy_ready,
-                            WIG ("showClockCheck"));
+  self->priv->name_watch_id = g_bus_watch_name (G_BUS_TYPE_SESSION,
+                                                BUS_NAME,
+                                                G_BUS_NAME_WATCHER_FLAGS_NONE,
+                                                on_bus_name_appeared,
+                                                on_bus_name_vanished,
+                                                self,
+                                                NULL);
 
 #undef WIG
 
@@ -772,6 +772,11 @@ indicator_datetime_panel_dispose (GObject * object)
     priv->loc_dlg = NULL;
   }
 
+  if (priv->name_watch_id != 0) {
+    g_bus_unwatch_name (priv->name_watch_id);
+    priv->name_watch_id = 0;
+  }
+
   if (priv->save_time_id) {
     g_source_remove (priv->save_time_id);
     priv->save_time_id = 0;
-- 
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