[Qt-interest] Is there any way to pass mouse events through a top level widget?

[liang jian]

    I know there is an attribute called
Qt::WA_TransparentForMouseEvents can disable the delivery of mouse
events, but unfortunately it works only for child widgets.
    I have also try to override event() method to ignore all the mouse
events, but Qt will not propergate these mouse events to its parent
because it is a top-level widget.
    Is there any way to pass mouse events through a top level widget?