如何使用QCombobox选择更新QTableView单元格?

如何更改代码以在第0行中显示QComboBox, 2、4和6或任何任意行。(无论 QComboBox是否需要显示取决于第一个单元格的值 在reach行中。)

之所以出现只能看到QCOMBOX的问题,是因为您只创建了一个QCOMBOX,要解决这个问题,您必须为要在其中建立QCOMBOX的每个单元格创建一个QCOMBOX。

我需要使用什么样的方法来替换单元格内容 QComboBox选择?

您必须将适当的信号连接到模型的setData()方法,我们可以使用QModelIndex,但这很危险,因为当您删除、移动或插入项目时,它可能会发生更改,因此使用QPersistentModelIndex是适当的,在这种情况下,您必须使用信号currentIndexChanged

在本例中,我将使用 QModelIndex :

def populate(self):
    row = self.QSModel.rowCount()
    for x in range(7):
        self.QSModel.insertRow(row)
        self.QSModel.setData(self.QSModel.index(row, 0), 'data')
        self.QSModel.item(row, 0).setEditable(True)
        self.QSModel.setData(self.QSModel.index(row, 1), 'data')
        self.QSModel.item(row, 1).setEditable(True)
        # add combobox delegate to even rows
        if x % 2 == 0:
            index = self.tableView.model().index(row, 1)
            cbDelegate = QComboBox()
            pix = QPersistentModelIndex(index)
            cbDelegate.currentIndexChanged[str].connect(lambda txt, pix=pix:self.tableView.model().setData(QModelIndex(pix), txt))
            cbDelegate.addItems(['choice1', 'choice2'])
            self.tableView.setIndexWidget(index, cbDelegate)
        self.QSModel.setData(self.QSModel.index(row, 2), 'data')
        self.QSModel.item(row, 1).setEditable(True)

在本例中,我将使用 QStandartItem :

def populate(self):
    row = self.QSModel.rowCount()
    for x in range(7):
        self.QSModel.insertRow(row)
        self.QSModel.setData(self.QSModel.index(row, 0), 'data')
        self.QSModel.item(row, 0).setEditable(True)
        self.QSModel.setData(self.QSModel.index(row, 1), 'data')
        self.QSModel.item(row, 1).setEditable(True)
        if x % 2 == 0:
            item = self.tableView.model().item(row, 1)
            cbDelegate = QComboBox()
            cbDelegate.currentIndexChanged[str].connect(item.setText)
            cbDelegate.addItems(['choice1', 'choice2'])
            self.tableView.setIndexWidget(item.index(), cbDelegate)
        self.QSModel.setData(self.QSModel.index(row, 2), 'data')
        self.QSModel.item(row, 1).setEditable(True)

执行类似操作的另一种方法是使用委托,为此我们创建一个继承自 QStyledItemDelegate :

class ComboBoxDelegate(QStyledItemDelegate):
    def paint(self, painter, option, index):
        if index.row()%2 == 0:
            opt = QStyleOptionComboBox()
            opt.rect = option.rect 
            opt.currentText = index.data()
            QApplication.style().drawComplexControl(QStyle.CC_ComboBox, opt, painter)
            QApplication.style().drawControl(QStyle.CE_ComboBoxLabel, opt, painter)
        else:
            QStyledItemDelegate.paint(self, painter, option, index)

    def createEditor(self, parent, option, index):
        if index.row()%2 == 0:
            combobox = QComboBox(parent)
            options = ['choice1', 'choice2']
            if index.data() not in options:
                combobox.addItem(index.data())
            combobox.addItems(options)
            return combobox
        return QStyledItemDelegate.createEditor(self, parent, option, index)

    def setEditorData(self, editor, index):
        if isinstance(editor, QComboBox):
            text = index.data()
            ix = editor.findText(text)
            if ix > 0:
                editor.setCurrentIndex(ix)
            else:
                index.model().setData(index, editor.currentText())
        else:
            QStyledItemDelegate.setEditorData(self, editor, index)

    def setModelData(self, editor, model, index):
        if isinstance(editor, QComboBox):
            model.setData(index, editor.currentText())
        else:
            QStyledItemDelegate.setModelData(self, editor, model, index)

class GUI(QDialog):
    def __init__(self):
        super(GUI, self).__init__()
        dirname = os.path.dirname(os.path.abspath(__file__))
        uic.loadUi(os.path.join(dirname,'main.ui'), self)
        self.btnPopulate.clicked.connect(self.populate)
        self.header = ['col1', 'col2', 'col3']
        self.QSModel = QStandardItemModel()
        self.QSModel.setColumnCount(3)
        self.QSModel.setHorizontalHeaderLabels(self.header)
        self.tableView.setModel(self.QSModel)
        self.tableView.setItemDelegateForColumn(1, ComboBoxDelegate(self.tableView))
        self.populate()

    def populate(self):
        row = self.QSModel.rowCount()
        for x in range(7):
            for i, value in enumerate(['data1', 'data2', 'data3']):
                self.QSModel.setItem(row+x, i, QStandardItem(value))
                self.QSModel.item(row+x, i).setEditable(True)