[empathy: 2/4] Add EmpathyChatManager::chats-changed signal and make the chat window listen to it.

[Jonny Lamb <jonnylamb src gnome org>]

commit 7415009e9f118174703834d95b91653f8de4e3f4
Author: Jonny Lamb <jonnylamb gnome org>
Date:   Mon Mar 1 11:31:52 2010 +0000

    Add EmpathyChatManager::chats-changed signal and make the chat window listen to it.
    
    Signed-off-by: Jonny Lamb <jonnylamb gnome org>

 src/empathy-chat-manager.c |   31 +++++++++++++++++++++++++++++++
 src/empathy-chat-manager.h |    1 +
 src/empathy-chat-window.c  |   42 +++++++++++++++++++++++++++++++++++-------
 3 files changed, 67 insertions(+), 7 deletions(-)
---
diff --git a/src/empathy-chat-manager.c b/src/empathy-chat-manager.c
index 051d07b..087077c 100644
--- a/src/empathy-chat-manager.c
+++ b/src/empathy-chat-manager.c
@@ -24,6 +24,13 @@
 
 #include "empathy-chat-manager.h"
 
+enum {
+  CHATS_CHANGED,
+  LAST_SIGNAL
+};
+
+static guint signals[LAST_SIGNAL];
+
 G_DEFINE_TYPE(EmpathyChatManager, empathy_chat_manager, G_TYPE_OBJECT)
 
 /* private structure */
@@ -96,6 +103,16 @@ empathy_chat_manager_class_init (
   object_class->finalize = empathy_chat_manager_finalize;
   object_class->constructor = empathy_chat_manager_constructor;
 
+  signals[CHATS_CHANGED] =
+    g_signal_new ("chats-changed",
+        G_TYPE_FROM_CLASS (object_class),
+        G_SIGNAL_RUN_LAST,
+        0,
+        NULL, NULL,
+        g_cclosure_marshal_VOID__UINT,
+        G_TYPE_NONE,
+        1, G_TYPE_UINT, NULL);
+
   g_type_class_add_private (empathy_chat_manager_class,
     sizeof (EmpathyChatManagerPriv));
 }
@@ -115,6 +132,9 @@ empathy_chat_manager_closed_chat (EmpathyChatManager *self,
   DEBUG ("Adding contact to queue: %s", empathy_contact_get_id (contact));
 
   g_queue_push_tail (priv->queue, g_object_ref (contact));
+
+  g_signal_emit (self, signals[CHATS_CHANGED], 0,
+      g_queue_get_length (priv->queue));
 }
 
 void
@@ -134,4 +154,15 @@ empathy_chat_manager_undo_closed_chat (EmpathyChatManager *self)
   empathy_dispatcher_chat_with_contact (contact, NULL, NULL);
 
   g_object_unref (contact);
+
+  g_signal_emit (self, signals[CHATS_CHANGED], 0,
+      g_queue_get_length (priv->queue));
+}
+
+guint
+empathy_chat_manager_get_num_chats (EmpathyChatManager *self)
+{
+  EmpathyChatManagerPriv *priv = GET_PRIV (self);
+
+  return g_queue_get_length (priv->queue);
 }
diff --git a/src/empathy-chat-manager.h b/src/empathy-chat-manager.h
index af4d977..1dc121c 100644
--- a/src/empathy-chat-manager.h
+++ b/src/empathy-chat-manager.h
@@ -63,6 +63,7 @@ EmpathyChatManager *empathy_chat_manager_dup_singleton (void);
 void empathy_chat_manager_closed_chat (EmpathyChatManager *self,
     EmpathyContact *contact);
 void empathy_chat_manager_undo_closed_chat (EmpathyChatManager *self);
+guint empathy_chat_manager_get_num_chats (EmpathyChatManager *self);
 
 G_END_DECLS
 
diff --git a/src/empathy-chat-window.c b/src/empathy-chat-window.c
index 50543f2..1df42f1 100644
--- a/src/empathy-chat-window.c
+++ b/src/empathy-chat-window.c
@@ -85,6 +85,9 @@ typedef struct {
 	GtkTargetList *contact_targets;
 	GtkTargetList *file_targets;
 
+	EmpathyChatManager *chat_manager;
+	gulong chat_manager_chats_changed_id;
+
 	/* Menu items. */
 	GtkUIManager *ui_manager;
 	GtkAction   *menu_conv_insert_smiley;
@@ -98,6 +101,7 @@ typedef struct {
 
 	GtkAction   *menu_tabs_next;
 	GtkAction   *menu_tabs_prev;
+	GtkAction   *menu_tabs_undo_close_tab;
 	GtkAction   *menu_tabs_left;
 	GtkAction   *menu_tabs_right;
 	GtkAction   *menu_tabs_detach;
@@ -1063,13 +1067,8 @@ static void
 chat_window_tabs_undo_close_tab_activate_cb (GtkAction         *action,
 					     EmpathyChatWindow *window)
 {
-	EmpathyChatManager *chat_manager;
-
-	chat_manager = empathy_chat_manager_dup_singleton ();
-
-	empathy_chat_manager_undo_closed_chat (chat_manager);
-
-	g_object_unref (chat_manager);
+	EmpathyChatWindowPriv *priv = GET_PRIV (window);
+	empathy_chat_manager_undo_closed_chat (priv->chat_manager);
 }
 
 static void
@@ -1754,6 +1753,17 @@ chat_window_drag_data_received (GtkWidget        *widget,
 }
 
 static void
+chat_window_chat_manager_chats_changed_cb (EmpathyChatManager *chat_manager,
+					   guint num_chats_in_manager,
+					   EmpathyChatWindow *window)
+{
+	EmpathyChatWindowPriv *priv = GET_PRIV (window);
+
+	gtk_action_set_sensitive (priv->menu_tabs_undo_close_tab,
+				  num_chats_in_manager > 0);
+}
+
+static void
 chat_window_finalize (GObject *object)
 {
 	EmpathyChatWindow     *window;
@@ -1786,6 +1796,13 @@ chat_window_finalize (GObject *object)
 		gtk_target_list_unref (priv->file_targets);
 	}
 
+	if (priv->chat_manager) {
+		g_signal_handler_disconnect (priv->chat_manager,
+					     priv->chat_manager_chats_changed_id);
+		g_object_unref (priv->chat_manager);
+		priv->chat_manager = NULL;
+	}
+
 	chat_windows = g_list_remove (chat_windows, window);
 	gtk_widget_destroy (priv->dialog);
 
@@ -1844,6 +1861,7 @@ empathy_chat_window_init (EmpathyChatWindow *window)
 				       "menu_edit_find", &priv->menu_edit_find,
 				       "menu_tabs_next", &priv->menu_tabs_next,
 				       "menu_tabs_prev", &priv->menu_tabs_prev,
+				       "menu_tabs_undo_close_tab", &priv->menu_tabs_undo_close_tab,
 				       "menu_tabs_left", &priv->menu_tabs_left,
 				       "menu_tabs_right", &priv->menu_tabs_right,
 				       "menu_tabs_detach", &priv->menu_tabs_detach,
@@ -1972,6 +1990,16 @@ empathy_chat_window_init (EmpathyChatWindow *window)
 	priv->current_chat = NULL;
 
 	priv->notify_mgr = empathy_notify_manager_dup_singleton ();
+
+	priv->chat_manager = empathy_chat_manager_dup_singleton ();
+	priv->chat_manager_chats_changed_id =
+		g_signal_connect (priv->chat_manager, "chats-changed",
+				  G_CALLBACK (chat_window_chat_manager_chats_changed_cb),
+				  window);
+
+	chat_window_chat_manager_chats_changed_cb (priv->chat_manager,
+						   empathy_chat_manager_get_num_chats (priv->chat_manager),
+						   window);
 }
 
 EmpathyChatWindow *