QPainter on a QtWidget?

[drmacro]

I'm trying to paint on a QtWidget. In this case a slider.

I created my widget with a paint event:

class MySlider(QtWidgets.QSlider):
    def __init__(self, parent=None):
        super(MySlider, self).__init__(parent)
 
    def paintEvent(self, QPaintEvent):
        qp = QPainter(self)
 
        qp.setPen(Qt.black)
        size = self.size()
        qp.drawLine(10,10,60,10)

class MySlider(QtWidgets.QSlider):
    def __init__(self, parent=None):
        super(MySlider, self).__init__(parent)

    def paintEvent(self, QPaintEvent):
        qp = QPainter(self)

        qp.setPen(Qt.black)
        size = self.size()
        qp.drawLine(10,10,60,10)

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And the line does show up, but the normal slider graphics (the knob and line) don't show up.

I assume I'm missing how to tell the slider widget to draw before or after my code is done. Or, am I totally off base (not unlikely for me... )

Mac

---

Added after 5 minutes:

I got it working by adding a call to super for the paint event, but is this the RIGHT way?:

class MySlider(QtWidgets.QSlider):
    def __init__(self, parent=None):
        super(MySlider, self).__init__(parent)
 
    def paintEvent(self, event):
        super(MySlider, self).paintEvent(event)
        qp = QPainter(self)
 
        qp.setPen(Qt.black)
        size = self.size()
        qp.drawLine(10,10,60,10)

class MySlider(QtWidgets.QSlider):
    def __init__(self, parent=None):
        super(MySlider, self).__init__(parent)

    def paintEvent(self, event):
        super(MySlider, self).paintEvent(event)
        qp = QPainter(self)

        qp.setPen(Qt.black)
        size = self.size()
        qp.drawLine(10,10,60,10)

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[anda_skoa]

If you want the base class to paint something, then calling the base class implementation is the right thing to do.

Cheers,
_