[Lazarus] FPImage docs?

[matt shaffer]

Bruce Tulloch schreef:
>> If you don't handle the mouse wheel events, then the LCL widgetset
>> interface or the underlying widget may translate the mousewheel to a
>> scroll message.
> This it indeed does (in GTK2 and Win32 at least). It's just not clear
> the mechanism by which the widget decides how far to move the scrollbar
> for each mousewheel event it translates.

On windows the scroll offset is equal to the TMouse.WheelScrollLines. The value is 
set by reading the windows.SystemParametersInfo SPI_GETWHEELSCROLLLINES. Default is 3.

If you want to have something else, you have to handle the OnMouseWheel event.

Vincent