[PySide] custom painted content in delegate disappears when cell is selected

[Frank Rueter | OHUfx]

And one more finding:
If I re-implement the view's mousePressEvent() the problem also doesn't 
arise.
Hmm, I'm intrigued...


On 5/05/18 4:04 PM, Frank Rueter | OHUfx wrote:
> Interestingly this does not happen when drawing a pixmap.
>
> On 5/05/18 3:27 PM, Frank Rueter | OHUfx wrote:
>> Hi all,
>>
>> I am drawing some rectangles into my cell via a delegate's paint 
>> event like so:
>>
>>
>> When I click one in the cells, the rectangles disappear, sometimes 
>> with a lag. Sometimes they reappear when I click another cell.
>>
>>
>> The text drawn by the default paint event behaves fine, so I am 
>> clearly missing something (probably obvious).
>> Below is my test code.
>> Any ideas? I'm sure I have a slap-on-the-forehead moment coming up...
>>
>> Cheers,
>> frank
>>
>> from PySide2 import QtWidgets
>> from PySide2 import QtCore
>>
>>
>> class VersionTableModel(QtCore.QAbstractTableModel):
>>     def __init__(self, parent=None):
>>         super(VersionTableModel, self).__init__(parent)
>>         self.customData = [range(6)] * 4
>>
>>     def rowCount(self, index=None):
>>         return 4
>>
>>     def columnCount(self, index=None):
>>         return 6
>>
>>     def data(self, index, role):
>>         if role == QtCore.Qt.DisplayRole:
>>             try:
>>                 return 
>> "{}".format(self.customData[index.row()][index.column()] )
>>             except TypeError:
>>                 return None
>>
>>
>> class VersionItemDelegate(QtWidgets.QStyledItemDelegate):
>>
>>     def paint(self, painter, option, index):
>>         super(self.__class__, self).paint(painter, option, index)
>>         # paint custom icon
>>         mv_rect1 = QtCore.QRect(0,0,18,10)
>>         mv_rect1.moveTopRight(option.rect.bottomLeft() + 
>> QtCore.QPoint(-18, -22))
>>         mv_rect2 = mv_rect1.translated(3, 3)
>>         mv_rect3 = mv_rect2.translated(3, 3)
>>         painter.setPen(QtCore.Qt.white)
>>         painter.setBrush(QtCore.Qt.red)
>>         for r in (mv_rect1, mv_rect2, mv_rect3):
>>             painter.drawRect(r)
>>
>>
>> if __name__ == '__main__':
>>     import sys
>>     app = QtWidgets.QApplication([])
>>     tableView = QtWidgets.QTableView()
>>     tableView.setModel(VersionTableModel())
>>     tableView.setItemDelegate(VersionItemDelegate())
>>     tableView.show()
>>     sys.exit(app.exec_())
>>
>> -- 
>>
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