Qt - Creating smooth rounded widget corners

Question

I tried to create smooth rounded corners of the widget using the method described below:

• Create a widget with Qt::Window | Qt::FramelessWindowHint Qt::Window | Qt::FramelessWindowHint and Qt::WA_TranslucentBackground flag;
• Create a QFrame inside the widget;
• Set the style for the QFrame , for example:

 border: 1px solid red; border-radius: 20px; background-color: black; 

I managed to achieve smooth rounded corners, but the widget was “windowed,” so I cannot position the widget according to other widgets. Can we achieve full transparency of the widget without making the window type widget?

Answer 1

Your question is not entirely clear. It seems to me that this is the widget that you want to add to the layout. If you need a rounded widget, just use a QFrame and set the style for it:

 myFrame->setStyleSheet(".QFrame{background-color: red; border: 1px solid black; border-radius: 10px;}"); 

There is no need to create a widget containing a QFrame . Just use QFrame directly.

Answer 2

If I understand your question correctly, you can use the QGraphicsOpacityEffect class for any windowless widget.