c320772499
* glib/ToggleRef.cs : flush a few leftover changes from a ToggleRef refinement. svn path=/trunk/gtk-sharp/; revision=75457
113 lines
3 KiB
C#
113 lines
3 KiB
C#
// GLib.ToggleRef.cs - GLib ToggleRef class implementation
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//
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// Author: Mike Kestner <mkestner@novell.com>
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//
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// Copyright <c> 2007 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 GLib {
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using System;
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using System.Runtime.InteropServices;
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internal class ToggleRef {
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IntPtr handle;
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object reference;
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GCHandle gch;
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public ToggleRef (GLib.Object target)
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{
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handle = target.Handle;
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gch = GCHandle.Alloc (this);
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reference = target;
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g_object_add_toggle_ref (target.Handle, ToggleNotifyCallback, (IntPtr) gch);
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g_object_unref (target.Handle);
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}
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public bool IsAlive {
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get {
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if (reference is WeakReference) {
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WeakReference weak = reference as WeakReference;
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return weak.IsAlive;
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}
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return true;
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}
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}
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public GLib.Object Target {
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get {
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if (reference is GLib.Object)
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return reference as GLib.Object;
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WeakReference weak = reference as WeakReference;
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return weak.Target as GLib.Object;
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}
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}
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public void Free ()
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{
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g_object_remove_toggle_ref (handle, ToggleNotifyCallback, (IntPtr) gch);
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reference = null;
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gch.Free ();
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}
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void Toggle (bool is_last_ref)
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{
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if (is_last_ref && reference is GLib.Object)
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reference = new WeakReference (reference);
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else if (!is_last_ref && reference is WeakReference) {
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WeakReference weak = reference as WeakReference;
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if (weak.IsAlive)
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reference = weak.Target;
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}
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}
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[CDeclCallback]
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delegate void ToggleNotifyHandler (IntPtr data, IntPtr handle, bool is_last_ref);
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static void RefToggled (IntPtr data, IntPtr handle, bool is_last_ref)
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{
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try {
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GCHandle gch = (GCHandle) data;
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ToggleRef tref = gch.Target as ToggleRef;
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tref.Toggle (is_last_ref);
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} catch (Exception e) {
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ExceptionManager.RaiseUnhandledException (e, false);
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}
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}
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static ToggleNotifyHandler toggle_notify_callback;
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static ToggleNotifyHandler ToggleNotifyCallback {
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get {
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if (toggle_notify_callback == null)
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toggle_notify_callback = new ToggleNotifyHandler (RefToggled);
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return toggle_notify_callback;
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}
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}
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[DllImport("libgobject-2.0-0.dll")]
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static extern void g_object_add_toggle_ref (IntPtr raw, ToggleNotifyHandler notify_cb, IntPtr data);
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[DllImport("libgobject-2.0-0.dll")]
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static extern void g_object_remove_toggle_ref (IntPtr raw, ToggleNotifyHandler notify_cb, IntPtr data);
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[DllImport("libgobject-2.0-0.dll")]
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static extern void g_object_unref (IntPtr raw);
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}
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}
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