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23ec73d6f9
* 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
52 lines
1.4 KiB
C#
52 lines
1.4 KiB
C#
// Gtk.DestroyHelper.cs - internal DestroyNotify helper
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//
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// Author: Mike Kestner <mkestner@novell.com>
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//
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// Copyright (c) 2005 Novell, Inc.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of version 2 of the Lesser GNU General
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// Public License as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this program; if not, write to the
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// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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namespace Gtk {
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using System;
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using System.Runtime.InteropServices;
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internal delegate void NativeDestroyNotify (IntPtr data);
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internal class DestroyHelper {
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private DestroyHelper () {}
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static void ReleaseGCHandle (IntPtr data)
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{
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if (data == IntPtr.Zero)
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return;
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GCHandle gch = (GCHandle) data;
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gch.Free ();
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}
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static NativeDestroyNotify release_gchandle;
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internal static NativeDestroyNotify NotifyHandler {
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get {
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if (release_gchandle == null)
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release_gchandle = new NativeDestroyNotify (ReleaseGCHandle);
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return release_gchandle;
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}
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}
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}
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}
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