python - PyQt5:使用 QTableView.setSortingEnabled 和 QSortFilterProxyModel 时的幻像列

Question

我有一个自定义 Qt 表模型，允许用户在创建后添加列和行。我正在尝试使用 QSortFilterProxyModel/QTableView 设置来显示此表，但是当我尝试在 TableView 上启用排序时，我遇到了奇怪的行为。我的 View 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 View 中。

有人见过这个或者知道发生了什么事吗？诚然，我还是一个 Qt 新手，所以也许我只是以错误的方式处理这个问题。谢谢。

# -*- 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。您必须调用endInsertRows之后beginInsertRows ，和endInsertColumns之后beginInsertColumns .

上面最后一个链接中最相关的一点是:

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，您必须在开始任何其他插入/删除之前调用endInsertColum()。