python pyqt and parent class

Question

class testWidget(QtGui.QWidget):
    def __init__(self, parent=None):
        super(testWidget, self).__init__(parent)
        self.parent = parent
        self.something()
    def something(self):
        self.parent.callme() # self.parent?.... nice?


class testClass():
    def __init__(self):
        self.widget = testWidget(parent=self)

test = testClass()

What is the cleanest way of dealing with a parent class in python(pyqt)? Is there a nicer way than calling self.parent directly?

Frankly, calling a parent widget method from its child widget is a bad idea. Either put the method out as a common function, or use event filter to catch focusInEvent event on any widget. — warvariuc
– warvariuc, Commented Aug 8, 2012 at 11:52

warvariuc · Accepted Answer · 2012-08-08 11:13:53Z

1

If you want to call a method of this widget's parent (if one has been set), use QObject.parent():

class TestWidget(QtGui.QWidget):
    def __init__(self, parent=None):
        super(TestWidget, self).__init__(parent)
    def something(self):
        self.parent().callMe()

class TestClass(QtCore.QObject):
    def __init__(self):
        super(TestClass, self).__init__(None)
        self.widget = TestWidget(parent=self)
        ...
    def callMe(self): pass

test = TestClass()

edited Aug 8, 2012 at 11:13

answered Aug 8, 2012 at 11:08

warvariuc

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4 Comments

user1584472 Over a year ago

Thanks guys! parent() was what I was looking for. I'm getting error on focusInEvent() for the widget though, will update the code above

warvariuc Over a year ago

@user1584472, it might be that the widget was reparented, if you've used layouts. I guess this is not a real code, just a simulation?

user1584472 Over a year ago

Yes loadui etc. Yep just quickly showing where it goes boom. I'm not editing the layout after the init point myself

warvariuc Over a year ago

self.parent().hello() # gives error in focusInEvent - print self.parent() at this point to understand what is it

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