PyQt5:使用时的虚拟列QTableView.setSortingEnabled和QSortFilterProxyMod

Question

我有一个定制的Qt表模型，它允许用户在创建后添加列和行。我试图使用QSortFilterProxyModel/QTableView设置显示此表，但当我尝试在表视图上启用排序时，出现了奇怪的行为。“我的视图”启动并正确显示添加的数据：

但是，当我单击其中一个列标题（进行排序）时，虚拟列将添加到视图中。在

有没有人见过这个或者知道发生了什么事？诚然，我还是Qt的新手，所以也许我只是走错了方向。谢谢。在

# -*- mode:python; mode:auto-fill; fill-column:79; coding:utf-8 -*-

from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

# =====================================================================
# =====================================================================
class SimpleProxyModel(QSortFilterProxyModel):
    def filterAcceptsColumn(self, col, index):
        return True

# =====================================================================
# =====================================================================
class SimpleModel(QAbstractTableModel):

    def __init__(self):
        super(SimpleModel, self).__init__()
        self._data = {}

    def rowCount(self, index=QModelIndex()):
        if len(self._data.values()) > 0:
            return len(self._data.values()[0])
        else:
            return 0

    def columnCount(self, index=QModelIndex()):
        return len(self._data.keys())

    def data( self, index, role = Qt.DisplayRole ):
        row, col = index.row(), index.column()

        if ( not index.isValid() or
             not ( 0 <= row < self.rowCount() ) or
             not ( 0 <= col < self.columnCount() ) ):
            return QVariant()

        if role == Qt.DisplayRole:
            return QVariant( self._data[col][row] )

        return QVariant()

    def addData( self, col, val):

        new_col = False
        # Turn on flag for new column
        if col not in self._data.keys():
            new_col = True

        if new_col:
            self.beginInsertColumns(QModelIndex(), self.columnCount(),self.columnCount())
            # Catch this column up with the others by adding blank rows
            self._data[col] = [""] * self.rowCount()

        self.beginInsertRows(QModelIndex(), self.rowCount(), self.rowCount())
        # Add data to each column, either the value specified or a blank
        for i in range(self.columnCount()):
            if i == col:
                self._data[i].append(val)
            else:
                self._data[i].append( "" )
        self.endInsertRows()

        if new_col:
            self.endInsertColumns()


# =====================================================================
# =====================================================================
class SimpleView(QWidget):

    def __init__(self, parent=None):

        super(SimpleView, self).__init__(parent)

        self._mainmodel = None
        self._proxymodel = None
        self._tableview = QTableView()
        self._tableview.setSortingEnabled(True)

        layout = QVBoxLayout()
        layout.addWidget( self._tableview )

        self.setLayout(layout)

    def setModel(self, model):

        self._mainmodel = model
        proxy = SimpleProxyModel()
        proxy.setSourceModel(model)
        self._tableview.setModel(proxy)

# =====================================================================
# =====================================================================
app = QApplication([])

v = SimpleView()
m = SimpleModel()
v.setModel( m )

m.addData(0,1)
m.addData(0,2)
m.addData(1,3)

v.show()
app.exec_()

Answer 1

Qt文档对此相当清楚。必须在beginInsertRows之后调用endInsertRows，在beginInsertColumns之后调用{a3}。在

以上最后一个环节最相关的一点是：

Note: This function emits the columnsAboutToBeInserted() signal which connected views (or proxies) must handle before the data is inserted. Otherwise, the views may end up in an invalid state.

因此，在开始任何其他插入/删除操作之前，必须调用endInsertColum()。在

Answer 2

问题似乎出在我的SimpleModel.addData方法中，与我如何嵌套列和行插入有关。如果将此方法更改为先插入新列，然后插入新行，则不会显示虚拟列。在

def addData( self, col, val):                                               

    if col not in self._data.keys():                                        
        self.beginInsertColumns(QModelIndex(), self.columnCount(),self.columnCount())
        # Catch this column up with the others by adding blank rows         
        self._data[col] = [""] * self.rowCount()                            
        self.endInsertColumns()                                             

    self.beginInsertRows(QModelIndex(), self.rowCount(), self.rowCount())   
    # Add data to each column, either the value specified or a blank        
    for i in range(self.columnCount()):                                     
        if i == col:                                                        
            self._data[i].append(val)                                       
        else:                                                               
            self._data[i].append( "" )                                      
    self.endInsertRows()