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* */*.cs : add lgpl license blurb and clean up (c)'s. * */*.custom : add lgpl license blurb and clean up (c)'s. * */glue/*.c : add lgpl license blurb and clean up (c)'s. file adds without license from now on are punishable by wedgie. svn path=/trunk/gtk-sharp/; revision=30401
113 lines
3 KiB
C#
113 lines
3 KiB
C#
// GLib.ManagedValue.cs : Managed types boxer
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//
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// Author: Rachel Hestilow <hestilow@ximian.com>
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//
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// Copyright (c) 2002 Rachel Hestilow
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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 GLib {
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using System;
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using System.Collections;
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using System.Runtime.InteropServices;
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using GLib;
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/// <summary>
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/// Managed types boxer
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/// </summary>
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///
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/// <remarks>
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/// Utility class for creating GBoxed wrappers around managed types
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/// </remarks>
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// FIXME:
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// This used to use GCHandles, but I rewrote it to debug
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// some odd interactions. Since the boxed code in GLib is designed
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// to not interact directly with the pointers, just using our own
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// arbitrary pointer values is fine. Still, it might be useful
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// to use GCHandle later on.
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internal class ManagedValue {
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private class ValueHolder {
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public object val;
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public int ref_count;
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}
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private delegate IntPtr CopyFunc (IntPtr ptr);
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private delegate void FreeFunc (IntPtr ptr);
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private static Hashtable pointers = new Hashtable ();
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private static IntPtr cur_ptr = IntPtr.Zero;
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private static CopyFunc copy;
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private static FreeFunc free;
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private static GType boxed_type = GType.Invalid;
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[DllImport("libgobject-2.0-0.dll")]
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private static extern IntPtr g_boxed_type_register_static (string typename, CopyFunc copy_func, FreeFunc free_func);
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public static GType GType {
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get {
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if (boxed_type == GType.Invalid) {
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copy = new CopyFunc (Copy);
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free = new FreeFunc (Free);
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boxed_type = new GLib.GType (g_boxed_type_register_static ("GtkSharpValue", copy, free));
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}
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return boxed_type;
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}
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}
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public static IntPtr Copy (IntPtr ptr)
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{
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ValueHolder holder = (ValueHolder) pointers[ptr];
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holder.ref_count++;
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return ptr;
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}
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public static void Free (IntPtr ptr)
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{
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ValueHolder holder = (ValueHolder) pointers[ptr];
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if (holder == null)
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return;
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holder.ref_count--;
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if (holder.ref_count < 1)
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pointers.Remove (ptr);
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}
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public static IntPtr WrapObject (object obj)
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{
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ValueHolder holder = new ValueHolder ();
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holder.val = obj;
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holder.ref_count = 1;
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cur_ptr = new IntPtr (((int) cur_ptr) + 1);
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pointers[cur_ptr] = holder;
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return cur_ptr;
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}
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public static object ObjectForWrapper (IntPtr ptr)
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{
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if (!pointers.Contains (ptr))
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return null;
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ValueHolder holder = (ValueHolder) pointers[ptr];
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return holder.val;
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}
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}
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}
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