[DUG] Capturing mouse wheel

[Phil Middlemiss]

Ok, I've tracked through the VCL code to see what happens and the issue 
is with TForm. Mousewheel messages get special handling and are passed 
to TCustomForm.MouseWheelHandler which directs the message to the active 
control.

So I can just override that method in the main app form and direct it to 
our control if the mouse is over it.

Phil.

Phil Middlemiss wrote:
> We have a component that can use the mouse wheel - unfortunately, we 
> also use another component (not ours) that uses the mouse wheel. The 
> standard windows convention seems to be that whatever window has the 
> focus gets to process the message first. So even though the mouse is 
> over our component when the mouse wheel is rolled, the other component 
> gets the message.
>
> I seem to remember some time ago seeing how to replace the main 
> TApplication message handler with your own, but can't remember how 
> now. Is this possible? What is the technique?
>
> Phil.
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