2001-10-04 Mike Kestner <mkestner@speakeasy.net>

* HACKING : Little bit of cleanup.
	* gdk/SimpleEvent.cs : Redesigned a bit. Docs.  Replaced refcounting
	mechanism with an instance hash and added ctor/dtor.  This class
	now completely encapsulates the signal attachment and forwarding
	mechanism for GdkEvent based signals.  It attaches to the raw signal,
	maintains a ref to the associated event handler, and uses the static
	callback to activate the event handler on signal receipt.
	* sample/makefile : killed one last CSC explicit reference.

svn path=/trunk/gtk-sharp/; revision=1076

ChangeLog

@@ -1,3 +1,14 @@
+2001-10-04  Mike Kestner <mkestner@speakeasy.net>
+
+	* HACKING : Little bit of cleanup.
+	* gdk/SimpleEvent.cs : Redesigned a bit. Docs.  Replaced refcounting 
+	mechanism with an instance hash and added ctor/dtor.  This class
+	now completely encapsulates the signal attachment and forwarding 
+	mechanism for GdkEvent based signals.  It attaches to the raw signal, 
+	maintains a ref to the associated event handler, and uses the static 
+	callback to activate the event handler on signal receipt.
+	* sample/makefile : killed one last CSC explicit reference. 
+
 2001-10-02  Mike Kestner <mkestner@speakeasy.net>
 
 	* glib/Value.cs : Tried adding CallingConvention.Cdecl to all the

HACKING

@@ -1,19 +1,15 @@
-Please please please hack on gtk-sharp.
+Before beginning work on something, please post your intentions to the 
-
+mailing list (gtk-sharp-list@ximian.com).  Duplication of effort just gets
-Okay, now for the details.
+folks cranky in general.  
 
 Prior to checking anything into CVS, please send a patch to the mailing list
-(gtk-sharp-list@ximian.com) for approval.  Any patches should be submitted in
+for approval.  Any patches should be submitted in diff -u format.  Also, it is 
-diff -u format.  Also, it is assumed that the submitter has verified that the
+assumed that the submitter has verified that the patch does not break the 
-patch does not break the build, and hopefully that it doesn't break runtime.
+build, and hopefully that it doesn't break runtime.
 
-Second, patches without Documentation comments will be seriously frowned upon,
+Patches without Documentation comments will be seriously frowned upon,
 if not outright rejected.  All classes, methods, properties, events, etc...
 that are non-private should be documented with XML comment tags.  At a minimum,
-the summary and remarks tags, plus returns and params, if applicable.
+the summary and remarks tags, plus returns and params, if applicable. Doing 
-
+this as we go is the only feasible way to make sure that our docs won't end
-Third, Make a ChangeLog entry.  Get credit for your hard work, and let me know
+up sucking bigtime.
-who I need to get cranky with at a glance, instead of having to do cvs history
-reports.  :-)
-
-Fourth, please please please hack on gtk-sharp.  

gdk/SimpleEvent.cs

@@ -6,6 +6,7 @@
 
 namespace Gdk {
 	using System;
+	using System.Collections;
 	using System.Runtime.InteropServices;
 	using GLib;
 	using Gdk;
@@ -29,42 +30,103 @@ namespace Gdk {
 		}
 	}
 
-	public delegate bool SimpleEventDelegate(IntPtr obj, IntPtr e, String name);
+	/// <summary>
+	///	SimpleEventDelegate Delegate
+	/// </summary>
+	///
+	/// <remarks>
+	///	Callback used to connect to GdkEvent based signals.
+	/// </remarks>
+
+	public delegate bool SimpleEventDelegate(IntPtr obj, IntPtr e, 
+						 int key);
+
+	/// <summary>
+	///	SimpleEvent Class
+	/// </summary>
+	///
+	/// <remarks>
+	///	Connects to a specified signal on a raw object and relays
+	///	events to an EventHandle when they occur.
+	/// </remarks>
+
 	public class SimpleEvent {
 
-		private static bool SimpleEventCallback (IntPtr obj, IntPtr e, String name)
+		// A Counter used to produce unique keys for instances.
-		{
+		private static int _NextKey = 0;
-			GLib.Object o = GLib.Object.GetObject (obj);
+
-			EventHandler eh = (EventHandler) o.Events [name];
+		// A hash table containing refs to all current instances.
-			if (eh != null)
+		private static Hashtable _Instances = new Hashtable ();
-			{
+
-				EventArgs args = new SimpleEventArgs (new Gdk.Event(e));
+		// locals to create and pin the shared delegate.
-				eh(o, args);
-			}
-			return true; //FIXME: How do we manage the return value?
-		}
-		private static int _RefCount;
 		private static SimpleEventDelegate _Delegate;
 		private static GCHandle _GCHandle;
-		public static SimpleEventDelegate Delegate
+
+		// Shared delegate that relays events to registered handlers
+		private static bool SimpleEventCallback (IntPtr obj, IntPtr e, 
+							 int inst_key)
 		{
-			get
+			if (!_Instances.Contains (inst_key)) 
-			{
+				throw new Exception ("Unexpected event key");
-				if (_Delegate == null)
+
-				{
+			SimpleEvent se = (SimpleEvent) _Instances [inst_key];
-					_Delegate = new SimpleEventDelegate(SimpleEventCallback);
+			EventArgs args = new SimpleEventArgs (
-					_GCHandle = GCHandle.Alloc (_Delegate, GCHandleType.Pinned);
+							new Gdk.Event (e));
-				}
+			se._handler (se._obj, args);
-				_RefCount++;
+			return true; //FIXME: How do we manage the return value?
-				return _Delegate;
-			}
 		}
-		public static void Unref()
+
+		// private instance members
+		private GLib.Object _obj;
+		private EventHandler _handler;
+		private int _key;
+
+		/// <summary>
+		///	SimpleEvent Constructor
+		/// </summary>
+		///
+		/// <remarks>
+		///	Registers a new event handler for a specified signal.
+		///	A connection to the raw object signal is made which
+		///	causes any events which occur to be relayed to the
+		///	event handler.
+		/// </remarks>
+
+		[DllImport ("gobject-1.3.dll", CharSet=CharSet.Ansi,
+			    CallingConvention=CallingConvention.Cdecl)]
+		static extern void g_signal_connect_data (
+				IntPtr obj, IntPtr name, SimpleEventDelegate eh,
+				int key, IntPtr p, int flags);
+
+		public SimpleEvent (GLib.Object obj, IntPtr raw, 
+				    String name, EventHandler eh)
 		{
-			_RefCount--;
+			if (_Delegate == null) {
-			if (_RefCount < 1)
+				_Delegate = new SimpleEventDelegate (
-			{
+							SimpleEventCallback);
-				_RefCount = 0;
+				_GCHandle = GCHandle.Alloc (
+						_Delegate, GCHandleType.Pinned);
+			}
+
+			_key = _NextKey++;
+			_Instances [_key] = this;
+			_obj = obj;
+			_handler = eh;
+
+			g_signal_connect_data (
+				raw, Marshal.StringToHGlobalAnsi (name),
+				_Delegate, _key, new IntPtr (0), 0);
+		}
+
+		// Destructor is needed to release references from the instance
+		// table and unpin the delegate if no refs remain.
+
+		~SimpleEvent ()
+		{
+			// FIXME: Disconnect the signal
+			_Instances.Remove (_key);
+
+			if (_Instances.Count == 0) {
 				_GCHandle.Free();
 				_Delegate = null;
 			}

sample/makefile

@@ -1,5 +1,3 @@
-CSC=/cygdrive/c/winnt/microsoft.net/framework/v1.0.2914/csc.exe
-
 all:
 	@echo "You must use 'make windows' or 'make unix'."
 	@echo "'make unix' is broken for now."