+ if (object == previous_focus_object)
+ return;
+ else
+ {
+ if (previous_focus_object)
+ g_object_unref (previous_focus_object);
+
+ previous_focus_object = object;
+ if (object)
+ {
+ g_object_ref (object);
+
+ for (i = 0; i < trackers->len; i++)
+ {
+ item = &g_array_index (trackers, FocusTracker, i);
+ g_return_if_fail (item != NULL);
+ item->func (object);
+ }
+ }
+
+ }
+}
+
+static guint
+add_listener (GSignalEmissionHook listener,
+ const gchar *object_type,
+ const gchar *signal_name,
+ const gchar *detail_string,
+ const gchar *hook_data)
+{
+ GType type;
+ guint signal_id;
+ gint rc = 0;
+ static gint listener_idx = 1;
+ GQuark detail_quark = 0;
+
+ type = g_type_from_name (object_type);
+ if (type)
+ {
+ signal_id = g_signal_lookup (signal_name, type);
+ detail_quark = g_quark_from_string (detail_string);
+
+ if (signal_id > 0)
+ {
+ AtkUtilListenerInfo *listener_info;
+
+ rc = listener_idx;
+
+ listener_info = g_new (AtkUtilListenerInfo, 1);
+ listener_info->key = listener_idx;
+ listener_info->hook_id =
+ g_signal_add_emission_hook (signal_id, detail_quark, listener,
+ g_strdup (hook_data),
+ (GDestroyNotify) g_free);
+ listener_info->signal_id = signal_id;
+
+ g_hash_table_insert(listener_list, &(listener_info->key), listener_info);
+ listener_idx++;
+ }
+ else
+ {
+ g_debug ("Signal type %s not supported\n", signal_name);
+ }
+ }
+ else
+ {
+ g_warning("Invalid object type %s\n", object_type);
+ }
+ return rc;