GtkSharp/glib/ToggleRef.cs
Mike Kestner 57810954a3 2007-03-08 Mike Kestner <mkestner@novell.com>
* glib/*.cs : add try/catch blocks to native callback
	methods for DestroyNotify, Copy/Free, and ToggleNotify handlers.  
	Raise UnhandledException events on catches.  

svn path=/trunk/gtk-sharp/; revision=73965
2007-03-08 20:28:24 +00:00

115 lines
3.1 KiB
C#

// GLib.ToggleRef.cs - GLib ToggleRef class implementation
//
// Author: Mike Kestner <mkestner@novell.com>
//
// Copyright <c> 2007 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 GLib {
using System;
using System.Runtime.InteropServices;
internal class ToggleRef {
IntPtr handle;
object reference;
GCHandle gch;
public ToggleRef (GLib.Object target)
{
handle = target.Handle;
gch = GCHandle.Alloc (this);
reference = target;
g_object_add_toggle_ref (target.Handle, ToggleNotifyCallback, (IntPtr) gch);
g_object_unref (target.Handle);
}
public bool IsAlive {
get {
if (reference is WeakReference) {
WeakReference weak = reference as WeakReference;
return weak.IsAlive;
}
return true;
}
}
public GLib.Object Target {
get {
if (reference is GLib.Object)
return reference as GLib.Object;
WeakReference weak = reference as WeakReference;
return weak.Target as GLib.Object;
}
}
public void Free ()
{
g_object_remove_toggle_ref (handle, ToggleNotifyCallback, (IntPtr) gch);
gch.Free ();
}
void Toggle (bool is_last_ref)
{
if (is_last_ref && reference is GLib.Object)
reference = new WeakReference (reference);
else if (!is_last_ref && reference is WeakReference) {
WeakReference weak = reference as WeakReference;
if (weak.IsAlive)
reference = weak.Target;
else
throw new Exception ("Toggling dead wrapper");
}
}
[CDeclCallback]
delegate void ToggleNotifyHandler (IntPtr data, IntPtr handle, bool is_last_ref);
static void RefToggled (IntPtr data, IntPtr handle, bool is_last_ref)
{
try {
GCHandle gch = (GCHandle) data;
ToggleRef tref = gch.Target as ToggleRef;
tref.Toggle (is_last_ref);
} catch (Exception e) {
ExceptionManager.RaiseUnhandledException (e, false);
}
}
static ToggleNotifyHandler toggle_notify_callback;
static ToggleNotifyHandler ToggleNotifyCallback {
get {
if (toggle_notify_callback == null)
toggle_notify_callback = new ToggleNotifyHandler (RefToggled);
return toggle_notify_callback;
}
}
[DllImport("libgobject-2.0-0.dll")]
static extern void g_object_add_toggle_ref (IntPtr raw, ToggleNotifyHandler notify_cb, IntPtr data);
[DllImport("libgobject-2.0-0.dll")]
static extern void g_object_remove_toggle_ref (IntPtr raw, ToggleNotifyHandler notify_cb, IntPtr data);
[DllImport("libgobject-2.0-0.dll")]
static extern void g_object_unref (IntPtr raw);
}
}