GladeProject: add handler signals

Add add, remove, change and activate handler signals.

These signals can be used to easily track signal changes in a project
instead of connecting callbacks to every widget.

4 files changed, 150 insertions, 3 deletions

diff --git a/gladeui/glade-marshallers.list b/gladeui/glade-marshallers.list
index 2891325f..1aaa3d2e 100644
--- a/gladeui/glade-marshallers.list
+++ b/gladeui/glade-marshallers.list
@@ -5,6 +5,7 @@ VOID:OBJECT
 VOID:STRING
 VOID:INT,INT
 VOID:OBJECT,OBJECT
+VOID:OBJECT,OBJECT,OBJECT
 VOID:OBJECT,BOOLEAN
 VOID:STRING,STRING,STRING
 OBJECT:POINTER
diff --git a/gladeui/glade-private.h b/gladeui/glade-private.h
index 35a57562..876dc160 100644
--- a/gladeui/glade-private.h
+++ b/gladeui/glade-private.h
@@ -44,6 +44,21 @@ GList *_glade_widget_peek_prop_refs (GladeWidget *widget);
 GladeCatalog *_glade_catalog_get_catalog (const gchar *name);
 GList        *_glade_catalog_tsort       (GList *catalogs);
 
+/* glade-project.c */
+
+void
+_glade_project_emit_add_signal_handler      (GladeWidget       *widget,
+                                             const GladeSignal *signal);
+void
+_glade_project_emit_remove_signal_handler   (GladeWidget       *widget,
+                                             const GladeSignal *signal);
+void
+_glade_project_emit_change_signal_handler   (GladeWidget       *widget,
+                                             const GladeSignal *old_signal,
+                                             const GladeSignal *new_signal);
+void
+_glade_project_emit_activate_signal_handler (GladeWidget       *widget,
+                                             const GladeSignal *signal);
 
 /* glade-project-properties.c */
 void
diff --git a/gladeui/glade-project.c b/gladeui/glade-project.c
index 1c40c865..670084e8 100644
--- a/gladeui/glade-project.c
+++ b/gladeui/glade-project.c
@@ -180,6 +180,10 @@ enum
   TARGETS_CHANGED,
   LOAD_PROGRESS,
   WIDGET_VISIBILITY_CHANGED,
+  ADD_SIGNAL_HANDLER,
+  REMOVE_SIGNAL_HANDLER,
+  CHANGE_SIGNAL_HANDLER,
+  ACTIVATE_SIGNAL_HANDLER,
   LAST_SIGNAL
 };
 
@@ -952,6 +956,80 @@ glade_project_class_init (GladeProjectClass *klass)
                     _glade_marshal_VOID__OBJECT_BOOLEAN,
                     G_TYPE_NONE, 2, GLADE_TYPE_WIDGET, G_TYPE_BOOLEAN);
 
+  /**
+   * GladeProject::add-signal-handler:
+   * @gladeproject: the #GladeProject which received the signal.
+   * @gladewidget: the #GladeWidget
+   * @signal: the #GladeSignal that was added to @gladewidget.
+   */
+  glade_project_signals[ADD_SIGNAL_HANDLER] =
+      g_signal_new ("add-signal-handler",
+                    G_TYPE_FROM_CLASS (object_class),
+                    G_SIGNAL_RUN_LAST,
+                    0,
+                    NULL, NULL,
+                    _glade_marshal_VOID__OBJECT_OBJECT,
+                    G_TYPE_NONE,
+                    2,
+                    GLADE_TYPE_WIDGET,
+                    GLADE_TYPE_SIGNAL);
+
+  /**
+   * GladeProject::remove-signal-handler:
+   * @gladeproject: the #GladeProject which received the signal.
+   * @gladewidget: the #GladeWidget
+   * @signal: the #GladeSignal that was removed from @gladewidget.
+   */
+  glade_project_signals[REMOVE_SIGNAL_HANDLER] =
+      g_signal_new ("remove-signal-handler",
+                    G_TYPE_FROM_CLASS (object_class),
+                    G_SIGNAL_RUN_LAST,
+                    0,
+                     NULL, NULL,
+                    _glade_marshal_VOID__OBJECT_OBJECT,
+                    G_TYPE_NONE,
+                    2,
+                    GLADE_TYPE_WIDGET,
+                    GLADE_TYPE_SIGNAL);
+
+  /**
+   * GladeProject::change-signal-handler:
+   * @gladeproject: the #GladeProject which received the signal.
+   * @gladewidget: the #GladeWidget
+   * @old_signal: the old #GladeSignal that changed
+   * @new_signal: the new #GladeSignal
+   */
+  glade_project_signals[CHANGE_SIGNAL_HANDLER] =
+      g_signal_new ("change-signal-handler",
+                    G_TYPE_FROM_CLASS (object_class),
+                    G_SIGNAL_RUN_LAST,
+                    0,
+                     NULL, NULL,
+                    _glade_marshal_VOID__OBJECT_OBJECT_OBJECT,
+                    G_TYPE_NONE,
+                    3,
+                    GLADE_TYPE_WIDGET,
+                    GLADE_TYPE_SIGNAL,
+                    GLADE_TYPE_SIGNAL);
+
+  /**
+   * GladeProject::activate-signal-handler:
+   * @gladeproject: the #GladeProject which received the signal.
+   * @gladewidget: the #GladeWidget
+   * @signal: the #GladeSignal that was activated
+   */
+  glade_project_signals[ACTIVATE_SIGNAL_HANDLER] =
+      g_signal_new ("activate-signal-handler",
+                    G_TYPE_FROM_CLASS (object_class),
+                    G_SIGNAL_RUN_LAST,
+                    0,
+                     NULL, NULL,
+                    _glade_marshal_VOID__OBJECT_OBJECT,
+                    G_TYPE_NONE,
+                    2,
+                    GLADE_TYPE_WIDGET,
+                    GLADE_TYPE_SIGNAL);
+
   glade_project_props[PROP_MODIFIED] =
     g_param_spec_boolean ("modified",
                           "Modified",
@@ -5383,3 +5461,53 @@ glade_project_command_delete (GladeProject *project)
   if (widgets)
     g_list_free (widgets);
 }
+
+/* Private */
+
+void
+_glade_project_emit_add_signal_handler (GladeWidget       *widget,
+                                        const GladeSignal *signal)
+{
+  GladeProject *project = glade_widget_get_project (widget);
+
+  if (project)
+    g_signal_emit (project, glade_project_signals[ADD_SIGNAL_HANDLER], 0,
+                   widget, signal);
+}
+
+void
+_glade_project_emit_remove_signal_handler (GladeWidget       *widget,
+                                           const GladeSignal *signal)
+{
+  GladeProject *project = glade_widget_get_project (widget);
+
+  if (project)
+    g_signal_emit (project, glade_project_signals[REMOVE_SIGNAL_HANDLER], 0,
+                   widget, signal);
+
+}
+
+void
+_glade_project_emit_change_signal_handler (GladeWidget       *widget,
+                                           const GladeSignal *old_signal,
+                                           const GladeSignal *new_signal)
+{
+  GladeProject *project = glade_widget_get_project (widget);
+
+  if (project)
+    g_signal_emit (project, glade_project_signals[CHANGE_SIGNAL_HANDLER], 0,
+                   widget, old_signal, new_signal);
+}
+
+void
+_glade_project_emit_activate_signal_handler (GladeWidget       *widget,
+                                             const GladeSignal *signal)
+{
+  GladeProject *project = glade_widget_get_project (widget);
+
+  if (project)
+    g_signal_emit (project, glade_project_signals[ACTIVATE_SIGNAL_HANDLER], 0,
+                   widget, signal);
+
+}
+
diff --git a/gladeui/glade-widget.c b/gladeui/glade-widget.c
index ccfaa500..e3914614 100644
--- a/gladeui/glade-widget.c
+++ b/gladeui/glade-widget.c
@@ -342,6 +342,7 @@ glade_widget_add_signal_handler (GladeWidget       *widget,
   new_signal_handler = glade_signal_clone (signal_handler);
   g_ptr_array_add (signals, new_signal_handler);
   g_signal_emit (widget, glade_widget_signals[ADD_SIGNAL_HANDLER], 0, new_signal_handler);
+  _glade_project_emit_add_signal_handler (widget, new_signal_handler);
 
   glade_project_verify_signal (widget, new_signal_handler);
 
@@ -388,6 +389,7 @@ glade_widget_remove_signal_handler (GladeWidget       *widget,
           break;
         }
     }
+  _glade_project_emit_remove_signal_handler (widget, signal_handler);
 }
 
 /**
@@ -444,10 +446,12 @@ glade_widget_change_signal_handler (GladeWidget       *widget,
 
           g_signal_emit (widget, glade_widget_signals[CHANGE_SIGNAL_HANDLER], 0, 
                          signal_handler_iter);
-
           break;
         }
     }
+  _glade_project_emit_change_signal_handler (widget,
+                                             old_signal_handler,
+                                             new_signal_handler);
 }
 
 static gboolean
@@ -1474,8 +1478,7 @@ glade_widget_class_init (GladeWidgetClass *klass)
   /**
    * GladeWidget::change-signal-handler:
    * @gladewidget: the #GladeWidget which received the signal.
-   * @arg1: the old #GladeSignal
-   * @arg2: the new #GladeSignal
+   * @arg1: the #GladeSignal that changed
    */
   glade_widget_signals[CHANGE_SIGNAL_HANDLER] =
       g_signal_new ("change-signal-handler",