Set opacity in Linux

[Momergil]

You are animating windowOpacity of poBaseWidget instead of your MessageFrame instance. Only top-level windows can have their windowOpacity manipulated.

Oh, I remember reading that in the manual; I didn't noticed I was doing that in my code. Anyway, why is that so? And, well, if the method show by anda_skoa is valid only for top-level windows, I'll restate my first question to: is there a way to create such a "fade" effect that is not by stylesheet and that is valid for any widget I want to apply the effect regardless of being a top level widget or not?

[anda_skoa]

So you want the content of the window to fade, not the window itself?

Maybe usingQGraphicsOpacityEffect on the widget which you want to fade.

Cheers,
_

[Momergil]

So you want the content of the window to fade, not the window itself?

Exactly, and your suggestion worked perfectly. Thanks!

Momergil