animate a window

[iGoo]

Hi,guys.
I want to animate a window. Just like the window slice form left to right.
When using windows api
AnimateWindow(,,,) without implementing WM_PAINTCLIENT message,
the window is black while Animating(and is WM_PAINTCLIENT the reason?? ).
And this solution can not be perfomed on other platforms.


Any direct solution in QT3/4 please.

Thanks.