how to animate sliding widget behind statusBar

I have a mainWindow, and defined a statusBar with some pushButtons. I want to animate a sliding widget behind the statusBar(pushbuttons) (like sliding out between stausBar and center window), but so far, i can only make it move on top of statusBar which will cover the pushbuttons. Is there is a way to achieve this? or if there is a way to start the animation at the edge of statusBar and center widget may also work.

Thank you so much.

If you make moving widget a child of the central widget (instead of main window), it's area will be clipped by parent, so it won't overlap pushbuttons on the status bar.

oh yeah....it works. Thank you so much. :D