GtkSharp/gtk/DestroyHelper.cs
Mike Kestner 23ec73d6f9 2005-04-05 Mike Kestner <mkestner@novell.com>
* gtk/DestroyHelper.cs : implement an internal DestroyNotify handler 
	to release GCHandles.
	* gtk/*.custom : rework existing persistent delegate implementations
	to use destroy notify or PersistentData.

svn path=/trunk/gtk-sharp/; revision=42571
2005-04-05 14:48:49 +00:00

52 lines
1.4 KiB
C#

// Gtk.DestroyHelper.cs - internal DestroyNotify helper
//
// Author: Mike Kestner <mkestner@novell.com>
//
// Copyright (c) 2005 Novell, Inc.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 2 of the Lesser GNU General
// Public License as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this program; if not, write to the
// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
namespace Gtk {
using System;
using System.Runtime.InteropServices;
internal delegate void NativeDestroyNotify (IntPtr data);
internal class DestroyHelper {
private DestroyHelper () {}
static void ReleaseGCHandle (IntPtr data)
{
if (data == IntPtr.Zero)
return;
GCHandle gch = (GCHandle) data;
gch.Free ();
}
static NativeDestroyNotify release_gchandle;
internal static NativeDestroyNotify NotifyHandler {
get {
if (release_gchandle == null)
release_gchandle = new NativeDestroyNotify (ReleaseGCHandle);
return release_gchandle;
}
}
}
}