Setting a transparent main window

问题

How to set main window background transparent on QT? Do I need an attribute or a style?
I've tried setting the opacity, but it didn't work for me.

app.setStyleSheet("QMainWindow {opacity:0}")

回答1:

you must set new attribute for MainWindow object as below:

class Main(QtGui.QMainWindow):
      def __init__(self):
          self.setAttribute(Qt.WA_TranslucentBackground)

回答2:

Just use the windowOpacity property:

http://doc.qt.io/qt-4.8/qwidget.html#windowOpacity-prop

来源：https://stackoverflow.com/questions/14943142/setting-a-transparent-main-window