PyQt: Overloading/Ignoring events on widgetsMar 10, 2010
You know when you have all these widgets laid out in your class, and you are hooking up all the connections, and you say “Aw dammit I have to subclass QLabel now just so make it ignore blahEvent”? You end up with all these little widget subclasses, where all they are doing is ignoring an event.
I noticed I was doing this a few times, in more than one of my classes, and finally got annoyed for the last time. I figured there had to be a simple way of just overloading the method on the normal object when I create an instance. Fortunately python considers everything objects and pretty much anything can be changed. So I did this:
myLabel = QLabel() myLabel.mousePressEvent = lambda event: event.ignore()
I have also had to make clickable widgets, such as QLabel:
myLabel = QLabel() myLabel.mousePressEvent = lambda event: myLabel.emit(SIGNAL("clicked"))
Or if you had to do more than just a single statement:
myLabel = QLabel() def clickedEvent(event): myLabel.emit(SIGNAL("clicked")) # do other stuff # do stuff event.accept() myLabel.mousePressEvent = clickedEvent
I like this better than piling up subclasses that don’t do much.