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![Mike Kestner](/assets/img/avatar_default.png)
* glib/SimpleSignal.cs : Reworked to parallel SimpleEvent. svn path=/trunk/gtk-sharp/; revision=1084
115 lines
2.9 KiB
C#
115 lines
2.9 KiB
C#
// GLib.Signals.Simple.cs - GLib Simple Signal implementation
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//
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// Authors: Bob Smith <bob@thestuff.net>
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// Mike Kestner <mkestner@speakeasy.net>
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//
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// (c) 2001 Bob Smith & Mike Kestner
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namespace 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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using GLib;
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/// <summary>
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/// SimpleDelegate Delegate
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/// </summary>
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///
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/// <remarks>
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/// Used to connect to simple signals which contain no signal-
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/// specific data.
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/// </remarks>
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public delegate void SimpleDelegate (IntPtr obj, int key);
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/// <summary>
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/// SimpleSignal Class
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/// </summary>
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///
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/// <remarks>
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/// Wraps a simple signal which contains no single-specific data.
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/// </remarks>
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public class SimpleSignal {
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// A counter used to produce unique keys for instances.
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private static int _NextKey = 0;
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// Hashtable containing refs to all current instances.
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private static Hashtable _Instances = new Hashtable ();
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// locals to create and pin the shared delegate.
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private static SimpleDelegate _Delegate;
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private static GCHandle _GCHandle;
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// Shared delegate that relays events to registered handlers.
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private static void SimpleCallback(IntPtr obj, int inst_key)
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{
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if (!_Instances.Contains (inst_key))
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throw new Exception ("Unexpected signal key");
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SimpleSignal ss = (SimpleSignal) _Instances [inst_key];
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EventArgs args = new EventArgs ();
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ss._handler (ss._obj, args);
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}
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// private instance members
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private GLib.Object _obj;
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private EventHandler _handler;
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private int _key;
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/// <summary>
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/// SimpleSignal Constructor
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/// </summary>
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///
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/// <remarks>
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/// Registers a new event handler for a specified signal.
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/// A connection to the raw object signal is made which
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/// causes any events which occur to be relayed to the
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/// event handler.
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/// </remarks>
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[DllImport ("gobject-1.3.dll", CharSet=CharSet.Ansi,
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CallingConvention=CallingConvention.Cdecl)]
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static extern void g_signal_connect_data (
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IntPtr obj, IntPtr name,
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SimpleDelegate cb,
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int key, IntPtr p, int flags);
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public SimpleSignal (GLib.Object obj, IntPtr raw,
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String name, EventHandler eh)
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{
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if (_Delegate == null) {
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_Delegate = new SimpleDelegate(SimpleCallback);
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/* FIXME: need layout attribute for
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* SimpleCallback to avoid an exception.
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* _GCHandle = GCHandle.Alloc (
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* _Delegate, GCHandleType.Pinned);
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*/
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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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_Instances [_key] = this;
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g_signal_connect_data (
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raw, Marshal.StringToHGlobalAnsi (name),
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_Delegate, _key, new IntPtr (0), 0);
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}
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// Destructor needed to release references from the instance
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// table and unpin the delegate if no refs remain.
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~SimpleSignal ()
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{
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_Instances.Remove (_key);
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if (_Instances.Count == 0) {
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// FIXME: when pin works _GCHandle.Free();
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_Delegate = null;
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}
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}
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}
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}
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