[mutter] display: Add signals for plugins to know when a grab op begins/ends

[Jasper St. Pierre <jstpierre src gnome org>]

commit efc90173b1c2c32d1db598af53e30b6da5a66f88
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri Feb 10 10:27:14 2012 -0500

    display: Add signals for plugins to know when a grab op begins/ends
    
    https://bugzilla.gnome.org/show_bug.cgi?id=670658

 src/core/display.c |   32 ++++++++++++++++++++++++++++++++
 1 files changed, 32 insertions(+), 0 deletions(-)
---
diff --git a/src/core/display.c b/src/core/display.c
index 713114a..267903c 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -51,6 +51,8 @@
 #include <meta/compositor.h>
 #include <X11/Xatom.h>
 #include <X11/cursorfont.h>
+#include "mutter-enum-types.h"
+
 #ifdef HAVE_SOLARIS_XINERAMA
 #include <X11/extensions/xinerama.h>
 #endif
@@ -135,6 +137,8 @@ enum
   WINDOW_CREATED,
   WINDOW_DEMANDS_ATTENTION,
   WINDOW_MARKED_URGENT,
+  GRAB_OP_BEGIN,
+  GRAB_OP_END,
   LAST_SIGNAL
 };
 
@@ -258,6 +262,28 @@ meta_display_class_init (MetaDisplayClass *klass)
                   G_TYPE_NONE, 1,
                   META_TYPE_WINDOW);
 
+  display_signals[GRAB_OP_BEGIN] =
+    g_signal_new ("grab-op-begin",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL, NULL,
+                  G_TYPE_NONE, 3,
+                  META_TYPE_SCREEN,
+                  META_TYPE_WINDOW,
+                  META_TYPE_GRAB_OP);
+
+  display_signals[GRAB_OP_END] =
+    g_signal_new ("grab-op-end",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL, NULL,
+                  G_TYPE_NONE, 3,
+                  META_TYPE_SCREEN,
+                  META_TYPE_WINDOW,
+                  META_TYPE_GRAB_OP);
+
   g_object_class_install_property (object_class,
                                    PROP_FOCUS_WINDOW,
                                    g_param_spec_object ("focus-window",
@@ -3702,6 +3728,9 @@ meta_display_begin_grab_op (MetaDisplay *display,
     {
       meta_window_refresh_resize_popup (display->grab_window);
     }
+
+  g_signal_emit (display, display_signals[GRAB_OP_BEGIN], 0,
+                 screen, display->grab_window, display->grab_op);
   
   return TRUE;
 }
@@ -3716,6 +3745,9 @@ meta_display_end_grab_op (MetaDisplay *display,
   if (display->grab_op == META_GRAB_OP_NONE)
     return;
 
+  g_signal_emit (display, display_signals[GRAB_OP_END], 0,
+                 display->grab_screen, display->grab_window, display->grab_op);
+
   if (display->grab_window != NULL)
     display->grab_window->shaken_loose = FALSE;