[gtk+] Update size of root window after display reconfiguration

[Kristian Rietveld <kristian src gnome org>]

commit 93530675de5e2d287bc27d0c6d691bbcbedef5e7
Author: Kristian Rietveld <kris gtk org>
Date:   Mon Oct 26 08:53:20 2009 +0100

    Update size of root window after display reconfiguration

 gdk/quartz/gdkprivate-quartz.h |   11 ++++++-----
 gdk/quartz/gdkscreen-quartz.c  |    2 ++
 gdk/quartz/gdkwindow-quartz.c  |   33 +++++++++++++++++++++------------
 3 files changed, 29 insertions(+), 17 deletions(-)
---
diff --git a/gdk/quartz/gdkprivate-quartz.h b/gdk/quartz/gdkprivate-quartz.h
index 258d1f8..dadec3f 100644
--- a/gdk/quartz/gdkprivate-quartz.h
+++ b/gdk/quartz/gdkprivate-quartz.h
@@ -105,11 +105,12 @@ extern GdkDragContext *_gdk_quartz_drag_source_context;
 #define GDK_WINDOW_IS_QUARTZ(win)        (GDK_IS_WINDOW_IMPL_QUARTZ (((GdkWindowObject *)win)->impl))
 
 /* Initialization */
-void _gdk_windowing_window_init  (void);
-void _gdk_events_init            (void);
-void _gdk_visual_init            (void);
-void _gdk_input_init             (void);
-void _gdk_quartz_event_loop_init (void);
+void _gdk_windowing_update_root_window_size (GdkScreen *screen);
+void _gdk_windowing_window_init             (void);
+void _gdk_events_init                       (void);
+void _gdk_visual_init                       (void);
+void _gdk_input_init                        (void);
+void _gdk_quartz_event_loop_init            (void);
 
 /* GC */
 typedef enum {
diff --git a/gdk/quartz/gdkscreen-quartz.c b/gdk/quartz/gdkscreen-quartz.c
index 54577ed..5c3db27 100644
--- a/gdk/quartz/gdkscreen-quartz.c
+++ b/gdk/quartz/gdkscreen-quartz.c
@@ -177,6 +177,8 @@ process_display_reconfiguration (GdkScreenQuartz *screen)
 
   gdk_screen_quartz_calculate_layout (GDK_SCREEN_QUARTZ (screen));
 
+  _gdk_windowing_update_root_window_size (GDK_SCREEN (screen));
+
   if (screen->emit_monitors_changed)
     {
       g_signal_emit_by_name (screen, "monitors-changed");
diff --git a/gdk/quartz/gdkwindow-quartz.c b/gdk/quartz/gdkwindow-quartz.c
index f60cc79..cda3615 100644
--- a/gdk/quartz/gdkwindow-quartz.c
+++ b/gdk/quartz/gdkwindow-quartz.c
@@ -1091,6 +1091,26 @@ _gdk_window_impl_new (GdkWindow     *window,
 }
 
 void
+_gdk_windowing_update_root_window_size (GdkScreen *screen)
+{
+  GdkWindowObject *private = (GdkWindowObject *)_gdk_root;
+
+  /* The size of the root window is so that it can contain all
+   * monitors attached to this machine.  The monitors are laid out
+   * within this root window.  We calculate the size of the root window
+   * and the positions of the different monitors in gdkscreen-quartz.c.
+   *
+   * This data is updated when the monitor configuration is changed.
+   */
+  private->x = 0;
+  private->y = 0;
+  private->abs_x = 0;
+  private->abs_y = 0;
+  private->width = gdk_screen_get_width (screen);
+  private->height = gdk_screen_get_height (screen);
+}
+
+void
 _gdk_windowing_window_init (void)
 {
   GdkWindowObject *private;
@@ -1107,18 +1127,7 @@ _gdk_windowing_window_init (void)
 
   impl = GDK_WINDOW_IMPL_QUARTZ (GDK_WINDOW_OBJECT (_gdk_root)->impl);
 
-  /* The size of the root window should be the same as the size of
-   * the screen it belongs to.
-   *
-   * FIXME: Of course this needs to be updated when you change the monitor
-   * configuration (add another one, remove one, etc).
-   */
-  private->x = 0;
-  private->y = 0;
-  private->abs_x = 0;
-  private->abs_y = 0;
-  private->width = gdk_screen_get_width (_gdk_screen);
-  private->height = gdk_screen_get_height (_gdk_screen);
+  _gdk_windowing_update_root_window_size (_gdk_screen);
 
   private->state = 0; /* We don't want GDK_WINDOW_STATE_WITHDRAWN here */
   private->window_type = GDK_WINDOW_ROOT;