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