When I try to set the background to semi transparent or transparent , the background gets black

  • As I mentioned the background goes black when I try to set it to transparent ot semi transparent.

    I tried this:

    QPalette P;
    P.setBrush(QPalette::Background , Qt::transparent);

    and this:

    this->setStyleSheet("QMainWindow {background:transparent}");

    also some other things like using rgba.

  • the only valid way to do this that worked with me is:


    but the problem with this is that I'm using widget that their parents is my mainwindow which I want it to be transparent , so if I set my main window to semi transparent using setWindowOpacity() it'll effect all of my widgets.

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