def METHOD_NAME(self, idx):
    if self._index:
        self.mdlOutline.setData(self._index, self.currentIndex())
    elif self._indexes:
        value = self.currentIndex()
        if self._various:
            if value == 0:
                return
            value -= 1
        self._updating = True
        for i in self._indexes:
            self.mdlOutline.setData(i, value)
        self._updating = False