def __init__(self,font=QtGui.QFont('Consolas',11) ,parent=None):
     BaseDocument.__init__(self, font, parent)
     
     # 用户操作记录
     self.__operateCache = OperateCache()
     self.operateCache = lambda : self.__operateCache
 def setText(self, text=''):
     BaseDocument.setText(self, text=text)
     self.totalLevelTextChangedSignal.emit(None)