How to create a slide-out window ?

[Lykurg]

Your examlpe could be achieved with the solution Ginsengelf. Or you have to set a mask to your widget and animate that.

[ada10]

I tried out the solution with starting rectangle QRect startRect( -420,0,500,300 ). Sure this works fine, but I would like how to set the mask so that the widget is visible only after its x >= 80

[ada10]

I was able to manage masking a particular region of the widget using setMask(). I have a small query regrading this. I want the masked region to remian valid even after the slide -out window is translated ( or moved ). How do I ensure this ?