[glade] GladeEditable: Automatically disconnect to signals when an editor is destroyed.

[Tristan Van Berkom <tvb src gnome org>]

commit 6626d36433bd9504879b74f606ff1b04f3166014
Author: Tristan Van Berkom <tristan van berkom gmail com>
Date:   Sun Apr 28 18:46:20 2013 +0900

    GladeEditable: Automatically disconnect to signals when an editor is destroyed.

 gladeui/glade-editable.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)
---
diff --git a/gladeui/glade-editable.c b/gladeui/glade-editable.c
index d205c39..605b141 100644
--- a/gladeui/glade-editable.c
+++ b/gladeui/glade-editable.c
@@ -39,6 +39,7 @@ G_DEFINE_INTERFACE (GladeEditable, glade_editable, GTK_TYPE_WIDGET);
 static GQuark glade_editable_project_quark = 0;
 static GQuark glade_editable_widget_quark = 0;
 static GQuark glade_editable_loading_quark = 0;
+static GQuark glade_editable_destroy_quark = 0;
 
 static void
 project_changed (GladeProject  *project,
@@ -61,6 +62,12 @@ project_closed (GladeProject  *project,
 }
 
 static void
+editable_destroyed (GladeEditable *editable)
+{
+  glade_editable_load (editable, NULL);
+}
+
+static void
 glade_editable_load_default (GladeEditable  *editable,
                             GladeWidget    *widget)
 {
@@ -102,6 +109,7 @@ glade_editable_default_init (GladeEditableIface *iface)
   glade_editable_project_quark = g_quark_from_static_string ("glade-editable-project-quark");
   glade_editable_widget_quark  = g_quark_from_static_string ("glade-editable-widget-quark");
   glade_editable_loading_quark = g_quark_from_static_string ("glade-editable-loading-quark");
+  glade_editable_destroy_quark = g_quark_from_static_string ("glade-editable-destroy-quark");
 
   iface->load = glade_editable_load_default;
 }
@@ -122,6 +130,15 @@ glade_editable_load (GladeEditable *editable, GladeWidget *widget)
   g_return_if_fail (GLADE_IS_EDITABLE (editable));
   g_return_if_fail (widget == NULL || GLADE_IS_WIDGET (widget));
 
+  /* Connect to the destroy signal once, make sure we unload the widget and disconnect
+   * to any signals when destroying
+   */
+  if (!GPOINTER_TO_INT (g_object_get_qdata (G_OBJECT (editable), glade_editable_destroy_quark)))
+    {
+      g_signal_connect (editable, "destroy", G_CALLBACK (editable_destroyed), NULL);
+      g_object_set_qdata (G_OBJECT (editable), glade_editable_destroy_quark, GINT_TO_POINTER (TRUE));
+    }
+
   iface = GLADE_EDITABLE_GET_IFACE (editable);
 
   g_object_set_qdata (G_OBJECT (editable), glade_editable_loading_quark, GINT_TO_POINTER (TRUE));