[mutter] Add MetaScreen::monitors-changed signal

[Alexander Larsson <alexl src gnome org>]

commit 0ff602be0663662ef73471c763ef9dbde3b8c704
Author: Alexander Larsson <alexl redhat com>
Date:   Fri Feb 25 11:25:37 2011 +0100

    Add MetaScreen::monitors-changed signal
    
    https://bugzilla.gnome.org/show_bug.cgi?id=609258

 src/core/screen-private.h |    1 +
 src/core/screen.c         |   12 ++++++++++++
 2 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/src/core/screen-private.h b/src/core/screen-private.h
index 8a2dea7..1d98a18 100644
--- a/src/core/screen-private.h
+++ b/src/core/screen-private.h
@@ -141,6 +141,7 @@ struct _MetaScreenClass
 
   void (*restacked)         (MetaScreen *);
   void (*workareas_changed) (MetaScreen *);
+  void (*monitors_changed)  (MetaScreen *);
 };
 
 MetaScreen*   meta_screen_new                 (MetaDisplay                *display,
diff --git a/src/core/screen.c b/src/core/screen.c
index 2f42ac2..b6abbe3 100644
--- a/src/core/screen.c
+++ b/src/core/screen.c
@@ -86,6 +86,7 @@ enum
   WORKSPACE_SWITCHED,
   STARTUP_SEQUENCE_CHANGED,
   WORKAREAS_CHANGED,
+  MONITORS_CHANGED,
 
   LAST_SIGNAL
 };
@@ -227,6 +228,15 @@ meta_screen_class_init (MetaScreenClass *klass)
                   g_cclosure_marshal_VOID__VOID,
                   G_TYPE_NONE, 0);
 
+  screen_signals[MONITORS_CHANGED] =
+    g_signal_new ("monitors-changed",
+		  G_TYPE_FROM_CLASS (object_class),
+		  G_SIGNAL_RUN_LAST,
+		  G_STRUCT_OFFSET (MetaScreenClass, monitors_changed),
+		  NULL, NULL,
+		  g_cclosure_marshal_VOID__VOID,
+		  G_TYPE_NONE, 0);
+
   g_object_class_install_property (object_class,
                                    PROP_N_WORKSPACES,
                                    pspec);
@@ -2791,6 +2801,8 @@ meta_screen_resize (MetaScreen *screen,
 
   /* Queue a resize on all the windows */
   meta_screen_foreach_window (screen, meta_screen_resize_func, 0);
+
+  g_signal_emit (screen, screen_signals[MONITORS_CHANGED], 0, index);
 }
 
 void