[lazarus] Patch: window subclassing, paint messages

[Mattias Gaertner]

On Fri, 4 Jul 2003 13:43:32 +0200
"Micha Nelissen" <mdvpost at hotmail.com> wrote:

> Mattias Gaertner wrote:
> > On Fri, 4 Jul 2003 13:15:15 +0200
> > "Micha Nelissen" <mdvpost at hotmail.com> wrote:
> > 
> >> Mattias Gaertner wrote:
> >>> On Fri, 4 Jul 2003 11:36:47 +0200
> >>> "Micha Nelissen" <mdvpost at hotmail.com> wrote:
> >>> 
> >>>> Hi,
> >>>> 
> >>>> Attached is a patch to implement proper window subclassing and
> >>>> paint messages. This will enable _LARGE_ parts of the lcl code with
> >>>> respect to the interface because we actually get messages like
> >>>> listbox insertitem etc. Speedbuttons will now also be drawn
> >>>> correctly, groupboxes are drawn correctly...etc.
> >>>> 
> >>>> In wincontrol.inc I have changed the defaulthandler to send a
> >>>> message. This is still up for debate, and I don't know the effects
> >>>> on the GTK. Comments are welcome.
> >>> 
> >>> I didn't found this behaviour in the VCL. So, I changed them back to
> >>> calling the DefaultHandler and added a TWinControl.DefaultHandler,
> >>> that calls the new interface procedure CallDefaultWndHandler. The
> >>> win32 interface then sends the paint message.
> >>> Please test it. We can also add an interface method of its own for
> >>> the paint message, if you like.
> >> 
> > 
> >> 2) more typing on the Message? 'const Message: TLMessage' maybe?
> > 
> > Messages have different size. It must be untyped.
> 
> But you cast it to a TLMessage anyway? To get the Msg field?

That's how messages are defined. They have the same start as TLMessage.


Mattias