qwidget.render drawing with offset in QStyledItemDelegate

I'm trying to create a delegate to draw custom widgets as elements in a listview on icon mode. I have it more or less working but I can't get the widgets to draw in the right place, it seems they are getting drawn considering (0,0) the origin on the main window not the origin of t开发者_如何学Pythonhe list view. What do I need to pass to render the widget on the right place? I know I can pass an offset... how can I calculate the offset between the main window and the listview?

This is my paint method on my delegate (derived from QStyledItemDelegate)

def paint(self, painter, option, index):

        painter.save()

        if option.state & QStyle.State_Selected:
            painter.fillRect(option.rect, option.palette.highlight());

        model = index.model()
        myWidget = model.listdata[index.row()]


        myWidget.setGeometry(option.rect)

        myWidget.render(painter, option.rect.topLeft() )

        painter.restore()

Thanks

/J

In case this is useful for someone else I'll post my solution...

I don't know if this is the best way of doing it, but I'm calculating the offset by mapping the orgin of my parent to the main window:

offset = self._parent.mapTo(self._mainWindow, QPoint(0,0))
myWidget.render(painter, option.rect.topLeft() + offset)

It works, so I'll use it until I find a better way for doing this.

You can render your Widget into a temporary pixmap and then draw the pixmap instead. That solves the shift issue:

def paint(self, painter, option, index):
        pic = QPixmap( option.rect.width(), option.rect.height() )
        w = ItemWidget()
        w.setGeometry( option.rect )
        w.render(pic)            
        painter.drawPixmap( option.rect, pic )

I use another alternative method, and it works.

painter.translate(option.rect.topLeft())
myWidget.render(painter, QtCore.QPoint(0, 0))