[PySide] Can't override paintEvent on QTableWidget

[Frank Rueter]

Brilliant, that not only works but makes perfect sense :)

Thanks Christian!


On Tue, Aug 30, 2022 at 7:38 PM Cristián Maureira-Fredes <
Cristian.Maureira-Fredes at qt.io> wrote:

>
>
> On 8/30/22 07:48, Frank Rueter wrote:
> > Hi all,
>
> Hey there,
>
> > I am trying to override the paintEvent in a QTableWidget to draw a
> > custom progressbar into the table area until the table data is loaded. I
> > have done this with other widgets in the past but the table widget won't
> > let me do this.
> > I am getting these errors:
> > QWidget::paintEngine: Should no longer be called
> > QPainter::begin: Paint device returned engine == 0, type: 1
> > QPainter::setBrush: Painter not active
> >
> > Here is a simple code snippet for testing:
> > https://gist.github.com/frueter/a5b722926a847c291d1472a6fd145dbf
> > <https://gist.github.com/frueter/a5b722926a847c291d1472a6fd145dbf>
> >
> > When I inherit from QWidget it works fine.
> > Is this sort of thing not possible with a QTableWidget?
>
> It's because QTableWidget is a subclass of QTableView (and that's one
> from QAbstractScrollArea),
> and AFAIK you need to open the painter based on the base viewport.
>
> https://doc.qt.io/qt-6/qabstractscrollarea.html#paintEvent
>
> and there you can see the hint to use the viewport.
>
> In your code,
> just replace:
>
> painter = QtGui.QPainter(self)
> by
> painter = QtGui.QPainter(self.viewport())
>
> and it should work. At least locally, I can see the gradient.
>
> > Cheers,
> > frank
> >
>
> Cheers
>
> --
> Dr. Cristián Maureira-Fredes
> Senior R&D Manager
>
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