QT4: Transparent Window with rounded corners

Question

How can I create a partially transparent window with rounded borders (no standard borders)?

(I used Qt::FramelessWindowHint to disable standard border

Answer 1

I had a similar problem where I wanted to paint on a toplevel widget and have only the painted part appear. setWindowOpacity changed the opacity of the painted part, which I didn't want.

this->setAttribute(Qt::WA_TranslucentBackground, true);

changed the opacity of the widget without the painted part. I just tried tossing on a button, and that also displays perfectly opaque. So you should be able to display other children however you like.