回答问题

我正在使用 QTableView 显示从QtSql.QSqlQuery检索到的数据

我想知道如何像在 excel 中一样为它创建过滤器。

在上图中,我需要获取所有 heders (Sh_Code,SH_Seq,Stage) 的过滤器。过滤器将在我们可以过滤的列中具有唯一值。

要求的结果

我需要带有下拉框的表格视图标题,其中列出了该列中的所有唯一值,就像下面的 excel 中一样。不需要顶部,标准过滤器...如图所示。只需要“全部”和唯一的“列项”

这是来自我的 .NET 应用程序,为了更清楚而上传

Answers

下面是一个在 PyQt 中使用QSortFilterProxyModel、QStandardItemModel和QTableView进行过滤的示例,它可以很容易地适应其他视图和模型:

#!/usr/bin/env python
#-*- coding:utf-8 -*-

from PyQt4 import QtCore, QtGui

class myWindow(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(myWindow, self).__init__(parent)
        self.centralwidget  = QtGui.QWidget(self)
        self.lineEdit       = QtGui.QLineEdit(self.centralwidget)
        self.view           = QtGui.QTableView(self.centralwidget)
        self.comboBox       = QtGui.QComboBox(self.centralwidget)
        self.label          = QtGui.QLabel(self.centralwidget)

        self.gridLayout = QtGui.QGridLayout(self.centralwidget)
        self.gridLayout.addWidget(self.lineEdit, 0, 1, 1, 1)
        self.gridLayout.addWidget(self.view, 1, 0, 1, 3)
        self.gridLayout.addWidget(self.comboBox, 0, 2, 1, 1)
        self.gridLayout.addWidget(self.label, 0, 0, 1, 1)

        self.setCentralWidget(self.centralwidget)
        self.label.setText("Regex Filter")

        self.model = QtGui.QStandardItemModel(self)

        for rowName in range(3) * 5:
            self.model.invisibleRootItem().appendRow(
                [   QtGui.QStandardItem("row {0} col {1}".format(rowName, column))    
                    for column in range(3)
                    ]
                )

        self.proxy = QtGui.QSortFilterProxyModel(self)
        self.proxy.setSourceModel(self.model)

        self.view.setModel(self.proxy)
        self.comboBox.addItems(["Column {0}".format(x) for x in range(self.model.columnCount())])

        self.lineEdit.textChanged.connect(self.on_lineEdit_textChanged)
        self.comboBox.currentIndexChanged.connect(self.on_comboBox_currentIndexChanged)

        self.horizontalHeader = self.view.horizontalHeader()
        self.horizontalHeader.sectionClicked.connect(self.on_view_horizontalHeader_sectionClicked)

    @QtCore.pyqtSlot(int)
    def on_view_horizontalHeader_sectionClicked(self, logicalIndex):
        self.logicalIndex   = logicalIndex
        self.menuValues     = QtGui.QMenu(self)
        self.signalMapper   = QtCore.QSignalMapper(self)  

        self.comboBox.blockSignals(True)
        self.comboBox.setCurrentIndex(self.logicalIndex)
        self.comboBox.blockSignals(True)

        valuesUnique = [    self.model.item(row, self.logicalIndex).text()
                            for row in range(self.model.rowCount())
                            ]

        actionAll = QtGui.QAction("All", self)
        actionAll.triggered.connect(self.on_actionAll_triggered)
        self.menuValues.addAction(actionAll)
        self.menuValues.addSeparator()

        for actionNumber, actionName in enumerate(sorted(list(set(valuesUnique)))):              
            action = QtGui.QAction(actionName, self)
            self.signalMapper.setMapping(action, actionNumber)  
            action.triggered.connect(self.signalMapper.map)  
            self.menuValues.addAction(action)

        self.signalMapper.mapped.connect(self.on_signalMapper_mapped)  

        headerPos = self.view.mapToGlobal(self.horizontalHeader.pos())        

        posY = headerPos.y() + self.horizontalHeader.height()
        posX = headerPos.x() + self.horizontalHeader.sectionPosition(self.logicalIndex)

        self.menuValues.exec_(QtCore.QPoint(posX, posY))

    @QtCore.pyqtSlot()
    def on_actionAll_triggered(self):
        filterColumn = self.logicalIndex
        filterString = QtCore.QRegExp(  "",
                                        QtCore.Qt.CaseInsensitive,
                                        QtCore.QRegExp.RegExp
                                        )

        self.proxy.setFilterRegExp(filterString)
        self.proxy.setFilterKeyColumn(filterColumn)

    @QtCore.pyqtSlot(int)
    def on_signalMapper_mapped(self, i):
        stringAction = self.signalMapper.mapping(i).text()
        filterColumn = self.logicalIndex
        filterString = QtCore.QRegExp(  stringAction,
                                        QtCore.Qt.CaseSensitive,
                                        QtCore.QRegExp.FixedString
                                        )

        self.proxy.setFilterRegExp(filterString)
        self.proxy.setFilterKeyColumn(filterColumn)

    @QtCore.pyqtSlot(str)
    def on_lineEdit_textChanged(self, text):
        search = QtCore.QRegExp(    text,
                                    QtCore.Qt.CaseInsensitive,
                                    QtCore.QRegExp.RegExp
                                    )

        self.proxy.setFilterRegExp(search)

    @QtCore.pyqtSlot(int)
    def on_comboBox_currentIndexChanged(self, index):
        self.proxy.setFilterKeyColumn(index)


if __name__ == "__main__":
    import sys

    app  = QtGui.QApplication(sys.argv)
    main = myWindow()
    main.show()
    main.resize(400, 600)
    sys.exit(app.exec_())

要获得所需的结果,单击标题会启动一个弹出菜单,并填充该列的唯一值。一旦选择了弹出菜单中的项目,该值将传递给self.proxy.setFilterRegExp(filterString),列传递给self.proxy.setFilterKeyColumn(filterValue)。