responding to events without deriving from Qt's widgets

It’s pretty annoying having to create every time custom widgets where we redefine the event() or mousePressEvent() methods, just for the sake of responding to some events. In my case I only need to respond when the left mouse button is pressed, but I have about 10 QPushButtons that should do different things when pressed… in this case I would end up having 10 different custom widgets derived from QPushButton… looks to me like a waste of time. So, is it possible to respond to events without having to derive Qt’s widgets to custom ones ?