Sets the line edit instance for this label.
        
        :param      lineEdit | <XLineEdit>

def setLineEdit(self, lineEdit):
        """
        Sets the line edit instance for this label.
        
        :param      lineEdit | <XLineEdit>
        """
        self._lineEdit = lineEdit
        if lineEdit:
            lineEdit.setFont(self.font())
            lineEdit.installEventFilter(self)
            lineEdit.resize(self.size())
            lineEdit.hide()