[Gtk-sharp-list] Returning Gdk.Events

[Paolo Molaro]

On 03/11/03 Miguel de Icaza wrote:
> > My suggested solution is to use something like:
> > 
> >  		public static Gdk.Event CurrrentEvent {
> >  			IntPtr handle = gtk_get_current_event ();
> > 			GdkEventType type;
> > 
> > 			type = (GdkEventType)Marshal.Read32 (handle);
> > 			switch (type) {
> > 			case GdkEventType.Expose:
> > 				return (Gdk.Event)Marshal.PtrToStructure (handle, typeof (Gdk.EventExpose));
> > 			case GdkEventType.ButtonPress:
> > 				return (Gdk.Event)Marshal.PtrToStructure (handle, typeof (Gdk.ButtonPress));
> > 			...
> > 			}
> >  		}
> > 
> > Modulo some small details, it should work nicely.
> 
> There is only one problem here: Gdk.Event is a class, and the various
> Gdk.EventXXXX are structures that do not share a common base class.
> 
> I could change the signature to return an `object' instead of a
> Gdk.Event, and it would be up to the user to do an `is' compare on the
> result.

Well, that looks like a workaround. It would be better to have the
Gdk.EventXXXX types be reference types derived from Gdk.Event:
this map nicely and I'm sure that's "what Jim Gettys would have done if 
he had C# back then" (TM) :-)

lupus

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