[Qt-interest] Collapse animation

[Ender EREL]

Hello everybody,
I am building a collapsible box widget. It has a title section, a 
collapse button beside the title and a widget area. When the user 
presses the collapse button, the widget area will collapse and only the 
title and button will remain.

I accomplished this by making the widget area invisible and 
recalculating the layout. Now i want to add collapsing (and expanding) 
animation to this widget, but i can't think of a way to do it.

Can anybody suggest me a solution, or a place to look for an example?

Thanks.

-- 
Ender EREL