[gtk+] Handle input extension events when making a window native

[Alexander Larsson <alexl src gnome org>]

commit 159214173d2ec626dd0390a5fd0e5beaa6404f6e
Author: Alexander Larsson <alexl redhat com>
Date:   Tue Dec 8 12:19:00 2009 +0100

    Handle input extension events when making a window native
    
    It may happen when turning a client side window into a native window
    that the window, or some of its children with the same native parent
    have extension events enabled, and thus have an input window enabled
    for the native parent which needs to change as the window is made
    native.
    
    We fix this by temporarily disabling extension events on all the affected
    windows while we create the native window, and then reenable them afterwards.
    
    This fixes: https://bugzilla.redhat.com/show_bug.cgi?id=544624

 gdk/gdkwindow.c |   71 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 71 insertions(+), 0 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index f05fdb2..b8055e9 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -1731,6 +1731,67 @@ gdk_window_reparent (GdkWindow *window,
     _gdk_synthesize_crossing_events_for_geometry_change (window);
 }
 
+static gboolean
+temporary_disable_extension_events (GdkWindowObject *window)
+{
+  GdkWindowObject *child;
+  GList *l;
+  gboolean res;
+
+  if (window->extension_events != 0)
+    {
+      g_object_set_data (G_OBJECT (window),
+			 "gdk-window-extension-events",
+			 GINT_TO_POINTER (window->extension_events));
+      gdk_input_set_extension_events ((GdkWindow *)window, 0,
+				      GDK_EXTENSION_EVENTS_NONE);
+    }
+  else
+    res = FALSE;
+
+  for (l = window->children; l != NULL; l = l->next)
+    {
+      child = l->data;
+
+      if (window->impl_window == child->impl_window)
+	res |= temporary_disable_extension_events (window);
+    }
+
+  return res;
+}
+
+static void
+reenable_extension_events (GdkWindowObject *window)
+{
+  GdkWindowObject *child;
+  GList *l;
+  int mask;
+
+  mask = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (window),
+					      "gdk-window-extension-events"));
+
+  if (mask != 0)
+    {
+      /* We don't have the mode here, so we pass in cursor.
+	 This works with the current code since mode is not
+	 stored except as part of the mask, and cursor doesn't
+	 change the mask. */
+      gdk_input_set_extension_events ((GdkWindow *)window, mask,
+				      GDK_EXTENSION_EVENTS_CURSOR);
+      g_object_set_data (G_OBJECT (window),
+			 "gdk-window-extension-events",
+			 NULL);
+    }
+
+  for (l = window->children; l != NULL; l = l->next)
+    {
+      child = l->data;
+
+      if (window->impl_window == child->impl_window)
+	reenable_extension_events (window);
+    }
+}
+
 /**
  * gdk_window_ensure_native:
  * @window: a #GdkWindow
@@ -1758,6 +1819,7 @@ gdk_window_ensure_native (GdkWindow *window)
   GdkWindowObject *above;
   GList listhead;
   GdkWindowImplIface *impl_iface;
+  gboolean disabled_extension_events;
 
   g_return_val_if_fail (GDK_IS_WINDOW (window), FALSE);
 
@@ -1778,6 +1840,12 @@ gdk_window_ensure_native (GdkWindow *window)
 
   /* Need to create a native window */
 
+  /* First we disable any extension events on the window or its
+     descendants to handle the native input window moving */
+  disabled_extension_events = FALSE;
+  if (impl_window->input_window)
+    disabled_extension_events = temporary_disable_extension_events (private);
+
   screen = gdk_drawable_get_screen (window);
   visual = gdk_drawable_get_visual (window);
 
@@ -1831,6 +1899,9 @@ gdk_window_ensure_native (GdkWindow *window)
   if (gdk_window_is_viewable (window))
     impl_iface->show (window, FALSE);
 
+  if (disabled_extension_events)
+    temporary_enable_extension_events (private);
+
   return TRUE;
 }