[lazarus] Patch: window subclassing, paint messages

[Micha Nelissen]

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.

Also:
1) make it a function to return a result
2) more typing on the Message? 'const Message: TLMessage' maybe?

Regards,

Micha.