I found this procedure to scroll the control the mouse is over when using
the mouse wheel, not just the focused control.
procedure TMainForm.MouseWheelHandler(var Message: TMessage);
var
Control: TWinControl;
begin
Control := FindVCLWindow(Mouse.CursorPos);
if Assigned(Control) and (Control <> ActiveControl) then
with Message do
begin
Result := Control.Perform(CM_MOUSEWHEEL, WParam, LParam);
if Result = 0 then Control.DefaultHandler(Message)
end
else inherited MouseWheelHandler(Message);
end;
This works well when the mouse is over a control that supports scrolling,
but crashes in the TWinControl.DefaultHandler procedure at CallWindowProc,
when over other controls. I'm not sure how to prevent this error. Even a
try/except to ignore the error doesn't work. Any ideas?
Cheers,
Ross.
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