pyqt qt4 QTableView如何禁用某些列的排序？

Question

所以我有一个QTableView,我只想让第1列而不是第2列进行列排序.

当然,我想installEventFilter上QHeaderView或者QTableView,但MouseButtonPress没有被通过,除非你的事件installEventFilter上QApplication

现在,如果eventFilter调用when ,则目标object始终是顶级窗口小部件,但 event.pos()实际上是相对于标头或表格单元格,具体取决于您单击的位置.

因此,我们无法QHeaderView.rect().contains(event.pos())确定用户是否单击了标题,因为当您单击第一个表格单元格的上边缘时会出现误报.

但是,您仍然可以使用globalPos计算它,但是当您更改布局或在tableview上方添加更多小部件时,您的eventFilter逻辑必须更改.

我相信event.pos()返回相对pos是一个错误,即使object参数总是引用相同的顶级小部件.

一个更合乎逻辑的API就是有一个event.target()方法来返回计算相对位置的目标.

但我没有看到target()方法或在此事件过滤器中查找目标的方法.

也许我错过了什么？

# -*- coding: utf-8 -*-
# pyqt windows 4.10.3
# python 2.7.5 32 bits
from PyQt4.QtCore import *
from PyQt4.QtGui import *

app = None
tableHeader = None

class MyModel(QAbstractTableModel):
    def rowCount(self, QModelIndex_parent=None, *args, **kwargs):
        return 2

    def columnCount(self, QModelIndex_parent=None, *args, **kwargs):
        return 2

    def data(self, modelIndex, role=None):
        if modelIndex.isValid():
            row = modelIndex.row()
            col = modelIndex.column()
            if role == Qt.DisplayRole:
                return "%02d,%02d" % (row, col)

    def flags(self, index):
        if index.isValid():
            return Qt.ItemIsEnabled

    def headerData(self, section, Qt_Orientation, role=None):
        if role == Qt.DisplayRole and Qt_Orientation == Qt.Horizontal:
            return "Column " + str(section+1)

class MyEventFilter(QObject):
    def eventFilter(self, object, event):
        if event.type() == QEvent.MouseButtonPress:
            # object is always app/top level widget
            print 'MouseButtonPress target :' + repr(object)
            # even though event.pos() gives pos relative to the header when you click on header,
            # and pos relative to table cells when you click on table cell
            print repr(event.pos())
            # however we can get the mouse's global position
            print repr(event.globalPos())
            # given the top level widget's geometry
            print repr(app.activeWindow().geometry())
            # and the table header's left, top and height
            print repr(tableHeader.rect())
            # we can find out whether mouse click is targeted at the header
            print repr(event.globalPos().y() - app.activeWindow().geometry().y())
            # BUT WHAT IF THE LAYOUT CHANGE OR WE ADD MORE WIDGETS ABOVE THE TABLEVIEW?
            # WE HAVE TO ADJUST THE CALCULATION ABOVE!
        return False


if __name__ == "__main__":
    import sys
    app = QApplication(sys.argv)
    w = QMainWindow()
    t = QTableView()
    tableHeader = t.horizontalHeader()
    t.setModel(MyModel())
    w.setCentralWidget(t)
    ef = MyEventFilter()
    # installing in QMainWindow or QTableView won't catch MouseButtonPress
    # https://qt-project.org/forums/viewthread/9347
    #w.installEventFilter(ef)
    #t.installEventFilter(ef)
    app.installEventFilter(ef)
    w.show()
    sys.exit(app.exec_())

Answer 1

有一个更简单的解决方案:重新实现模型的排序方法,并且只允许对适当的列进行排序.

此外,作为一个额外的细化,使用标头的sortIndicatorChanged信号在适当时恢复当前排序指示符.

这是一个演示脚本:

from PyQt4 import QtGui, QtCore

class TableModel(QtGui.QStandardItemModel):
    _sort_order = QtCore.Qt.AscendingOrder

    def sortOrder(self):
        return self._sort_order

    def sort(self, column, order):
        if column == 0:
            self._sort_order = order
            QtGui.QStandardItemModel.sort(self, column, order)

class Window(QtGui.QWidget):
    def __init__(self, rows, columns):
        QtGui.QWidget.__init__(self)
        self.table = QtGui.QTableView(self)
        model = TableModel(rows, columns, self.table)
        for row in range(rows):
            for column in range(columns):
                item = QtGui.QStandardItem('(%d, %d)' % (row, column))
                item.setTextAlignment(QtCore.Qt.AlignCenter)
                model.setItem(row, column, item)
        self.table.setModel(model)
        self.table.setSortingEnabled(True)
        self.table.horizontalHeader().sortIndicatorChanged.connect(
            self.handleSortIndicatorChanged)
        layout = QtGui.QVBoxLayout(self)
        layout.addWidget(self.table)

    def handleSortIndicatorChanged(self, index, order):
        if index != 0:
            self.table.horizontalHeader().setSortIndicator(
                0, self.table.model().sortOrder())

if __name__ == '__main__':

    import sys
    app = QtGui.QApplication(sys.argv)
    window = Window(5, 5)
    window.show()
    window.setGeometry(600, 300, 600, 250)
    sys.exit(app.exec_())