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GtkWorkarounds.cs

//
// GtkWorkarounds.cs
//
// Author:
//   Aaron Bockover <abockover@novell.com>
//
// Copyright (C) 2008 Novell, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Reflection;

namespace Hyena.Gui
{
    public static class GtkWorkarounds
    {
        private static bool toggle_ref_supported;
        private static MethodInfo g_object_ref;
        private static MethodInfo gdk_window_destroy;
        private static object [] invoke_args;

        static GtkWorkarounds ()
        {
            if (!(toggle_ref_supported = Assembly.GetAssembly (typeof (GLib.Object)).GetType (
                "GLib.ToggleRef") != null)) {
                return;
            }

            // Find the P/Invoke signatures we need so we can avoid a dllmap
            g_object_ref = typeof (GLib.Object).GetMethod ("g_object_ref",
                BindingFlags.NonPublic | BindingFlags.Static);

            gdk_window_destroy = typeof (Gdk.Window).GetMethod ("gdk_window_destroy",
                BindingFlags.NonPublic | BindingFlags.Static);
        }

        public static void WindowDestroy (Gdk.Window window)
        {
            // There is a bug in GDK, and subsequently in Gdk# 2.8.5 through 2.12.1
            // where the managed Gdk.Window.Destroy function does not obtain a
            // normal reference (non-toggle) on the GdkWindow before calling
            // _destroy on it, which the native function apparently expects.

            // https://bugzilla.novell.com/show_bug.cgi?id=382186
            // http://anonsvn.mono-project.com/viewcvs/trunk/gtk-sharp/gdk/Window.custom?rev=101734&r1=42529&r2=101734

            if (window == null) {
                return;
            }

            if (!toggle_ref_supported) {
                window.Destroy ();
                return;
            }

            // If this ever happens I will move out west and start farming...
            if (g_object_ref == null || gdk_window_destroy == null) {
                window.Destroy ();
                return;
            }

            if (invoke_args == null) {
                invoke_args = new object[1];
            }

            invoke_args[0] = window.Handle;
            g_object_ref.Invoke (null, invoke_args);
            gdk_window_destroy.Invoke (null, invoke_args);

            window.Dispose ();
        }
    }
}

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