[Lazarus] OnMouseWheel event issue

[And3mD]

Hello!

Some time ago I have the same problem.
Unfortunately this is windows design.

When you scroll then:
If focused control supports scrolling its get WM_MOUSEWHELL message, if it  
not support scrolling message is send to focused control parent.

To handle this message in Lazarus you must use SetWindowLong or  
SetWindowLongPtr something like this:

http://wiki.freepascal.org/Win32/64_Interface#Processing_non-user_messages_in_your_window

Greetings
Andrzej Kilijanski

Dnia 19-11-2010 o 10:03:58 Birger Jansen <birger at cnoc.nl> napisał(a):

> Hi all,
>
> I have a TPanel on a TForm and an event on the TForm.OnMouseWheel. This  
> works when I use the mousewheel on the form. But as soon as the cursor  
> is over the TPanel, the OnMouseWheel event on the parent form is not  
> triggered. Since the TPanel has no OnMouseWheel there is no way to use a  
> mousewheel on a panel.
>
> In Delphi, the TPanel passes the event to the parent control (TForm).
>
> Shall I report a bug or is this designed behaviour?
> I think it relates to this: http://bugs.freepascal.org/view.php?id=12361
>
> Kind regards,
>   Birger Jansen
>
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