How to subclass QMessageBox and run operation before closing

Question

I would like to launch a process within a QMessageBox subclass before it returns via the AcceptRole. It's not clear to me why the following does not work:

class Question(QtGui.QMessageBox):

    def __init__(self, text):
        QtGui.QMessageBox.__init__(self, QtGui.QMessageBox.Question, 
           "title", text, buttons=QtGui.QMessageBox.Ok | QtGui.QMessageBox.Cancel)
        self.text = text

    def accept(self):

        # run opertation
        print self.text

        QtGui.QMessageBox.accept(self)

dial = Question("text")
dial.exec_()

Since the buttonRole for QMessageBox.Ok is AcceptRole, I would expect accept() to be called. Is this not the case?

Any insight would be appreciated.

accept() is a slot, it is not called automatically, you have to call it so it will never be called automatically. — eyllanesc, Feb 08 '18 at 20:25

score 2 · Accepted Answer · answered Feb 08 '18 at 21:07

You have the right idea. You just need to reimplement the virtual done() slot, rather than the virtual accept() slot:

class Question(QtGui.QMessageBox):
    def __init__(self, text):
        QtGui.QMessageBox.__init__(
            self, QtGui.QMessageBox.Question, "title", text,
            buttons=QtGui.QMessageBox.Ok | QtGui.QMessageBox.Cancel)
        self.text = text

    def done(self, result):
        print self.text
        QtGui.QMessageBox.done(self, result)

The result will be StandardButton value of the button that was clicked (i.e. QMessageBox.Ok or QMessageBox.Cancel, in the above example).

How to subclass QMessageBox and run operation before closing

1 Answers1