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// GLib.SignalCallback.cs - Signal callback base class implementation
//
// Authors: Mike Kestner <mkestner@ximian.com>
//
// Copyright (c) 2001 Mike Kestner
// Copyright (c) 2004 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 Gst.GLib {
using System;
using System.Collections;
using System.Runtime.InteropServices;
[Obsolete ("Replaced by GLib.Signal.")]
public abstract class SignalCallback : IDisposable {
// A counter used to produce unique keys for instances.
protected static int _NextKey = 0;
// Hashtable containing refs to all current instances.
protected static Hashtable _Instances = new Hashtable ();
// protected instance members
protected GLib.Object _obj;
protected Delegate _handler;
protected int _key;
protected System.Type _argstype;
protected uint _HandlerID;
protected SignalCallback (GLib.Object obj, Delegate eh, System.Type argstype)
{
_key = _NextKey++;
_obj = obj;
_handler = eh;
_argstype = argstype;
_Instances [_key] = this;
}
public void AddDelegate (Delegate d)
{
_handler = Delegate.Combine (_handler, d);
}
public void RemoveDelegate (Delegate d)
{
_handler = Delegate.Remove (_handler, d);
}
[DllImport("libgobject-2.0-0.dll")]
static extern uint g_signal_connect_data(IntPtr obj, IntPtr name, Delegate cb, int key, IntPtr p, int flags);
protected void Connect (string name, Delegate cb, int flags)
{
IntPtr native_name = Marshaller.StringToPtrGStrdup (name);
_HandlerID = g_signal_connect_data(_obj.Handle, native_name, cb, _key, new IntPtr(0), flags);
Marshaller.Free (native_name);
}
[DllImport("libgobject-2.0-0.dll")]
static extern void g_signal_handler_disconnect (IntPtr instance, uint handler);
[DllImport("libgobject-2.0-0.dll")]
static extern bool g_signal_handler_is_connected (IntPtr instance, uint handler);
protected void Disconnect ()
{
if (g_signal_handler_is_connected (_obj.Handle, _HandlerID))
g_signal_handler_disconnect (_obj.Handle, _HandlerID);
}
public void Dispose ()
{
Dispose (true);
GC.SuppressFinalize (this);
}
protected virtual void Dispose (bool disposing)
{
if (disposing) {
_obj = null;
_handler = null;
_argstype = null;
}
}
~SignalCallback ()
{
Dispose (false);
}
}
}
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