def rowsAboutToBeRemoved(self, parent, start, end):
if not self.model():
return
row = start
while row <= end:
index = self.model().index(row, 1, self.rootIndex())
value = self.model().data(index).toDouble()[0]
if value > 0.0:
self.totalValue -= value
self.validItems -= 1
row += 1
QAbstractItemView.rowsAboutToBeRemoved(self, parent, start, end)