Returns the joiner operator type for this entry widget.
        
        :return     <QueryCompound.Op>

def joiner(self):
        """
        Returns the joiner operator type for this entry widget.
        
        :return     <QueryCompound.Op>
        """
        act = self.uiJoinSBTN.currentAction()
        if not act:
            return None
        elif act.text() == 'AND':
            return QueryCompound.Op.And
        return QueryCompound.Op.Or