1 files changed, 106 insertions, 0 deletions
diff --git a/gstreamer-sharp/glib-sharp/SignalCallback.cs b/gstreamer-sharp/glib-sharp/SignalCallback.cs
new file mode 100644
index 0000000..1daa04d
--- /dev/null
+++ b/gstreamer-sharp/glib-sharp/SignalCallback.cs
@@ -0,0 +1,106 @@
+// 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 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);
+		}
+	}
+}
+