How to put a shadow to a Frameless window in Qt
I'm trying to create a Frameless window that has a shadow under it.When we create a borderless window with Qt::FramelessWindowHint flag it doesn't contain a shadow. But we can put shadows to a child widgets easy by creating a QGraphicsDropShadowEffect object and then pass it to the widget through setGraphicsEffect function. But this doesn't seem to work for QMainWindow. Please help me to put shadow to a frameless window in Qt...
Answer
You can do it using this simple hack:
Add a "QWidget" (say widget) to the MainWindow and move everything that's on the MainWindow to the widget. Then do this:
setAttribute(Qt::WA_TranslucentBackground); //enable MainWindow to be transparent
QGraphicsDropShadowEffect* effect = new QGraphicsDropShadowEffect();
effect->setBlurRadius(5);
ui->widget->setGraphicsEffect(effect);
This seems to work for me. See:
