編輯QTableView單元格值

Question

如何在編輯QTableView單元格時保持其原始值？當我開始編輯單元格時，它會自動清除。我搜遍了所有的地方，我找不到任何會導致某處的指針。我的實現模型視圖：

class BlockViewModel(QAbstractTableModel): 

    def __init__(self, structure, data): 
     QAbstractTableModel.__init__(self) 
     self._data = data 
     self._struct = structure 

     for i, s in enumerate(structure): 
      cmnt = s['comment'] 
      name = cmnt if cmnt else s['name'] 
      self.setHeaderData(i, Qt.Horizontal, name) 

    def rowCount(self, parent=QModelIndex()): 
     return len(self._data) 

    def columnCount(self, parent = QModelIndex()): 
     return len(self._struct) 

    def data(self, index, role): 
     if role == Qt.DisplayRole: 
      try: 
       row = index.row() 
       col = index.column() 
       name = self._struct[col]['name'] 
       return self._data[row][name] 
      except: 
       pass 
     elif role == Qt.CheckStateRole: 
      return None 

     return None 

    def flags(self, index): 
     flags = super(self.__class__,self).flags(index) 

     flags |= Qt.ItemIsEditable 
     flags |= Qt.ItemIsSelectable 
     flags |= Qt.ItemIsEnabled 
     flags |= Qt.ItemIsDragEnabled 
     flags |= Qt.ItemIsDropEnabled 

     return flags 

    def headerData(self, section, orientation, role = Qt.DisplayRole): 
     if role != Qt.DisplayRole: 
      return None 

     if orientation == Qt.Horizontal: 
      cmnt = self._struct[section]['comment'] 
      return cmnt if cmnt else self._struct[section]['name'] 
     else: 
      return str(section) 

    def setData(self, index, value, role=Qt.EditRole): 
     row = index.row() 
     col = index.column() 
     name = self._struct[col]['name'] 
     self._data[row][name] = value 
     self.emit(SIGNAL('dataChanged()')) 
     return True 

Answer 1

的data方法負責顯示數據的所有時間。編輯時，它使用EditRole。因此，修改data方法來顯示在EditRole一樣DisplayRole值象下面這樣：

def data(self, index, role): 
    if role == Qt.DisplayRole or role == Qt.EditRole: 
     try: 
      row = index.row() 
      col = index.column() 
      name = self._struct[col]['name'] 
      return self._data[row][name] 
     except: 
      pass 
    elif role == Qt.CheckStateRole: 
     return None 

    return None