使用模型和委托小部件将行添加到 QTableView

Question

我正在尝试使用 QAbstractTableModel 和 QItemDelegate 向 QTableView 添加一行，其中小部件出现在添加的行中。从我读过的内容来看，我需要在添加的行的每个项目上调用 .edit(index) 来调用创建小部件的 createEditor 但是我得到 edit: editing failed

QItemDelegate:

class Delegate(QItemDelegate):

    def __init__(self):
        QItemDelegate.__init__(self)

        self.type_items = ["1", "2", "3"]

    def createEditor(self, parent, option, index):

        # COMBOBOX, LINEEDIT, TIMEDIT
        if index.column() == 0:
            comboBox = QComboBox(parent)
            for text in self.type_items:
                comboBox.addItem(text, (index.row(), index.column()))
            return comboBox

        elif index.column() == 1:
            lineEdit = QLineEdit(parent)
            return lineEdit

        elif index.column() == 2:
            timeEdit = QTimeEdit(parent)
            return timeEdit

    def setEditorData(self, editor, index):
        value = index.model()._data[index.row()][index.column()]

        if index.column() == 0:
            editor.setCurrentIndex(self.type_items.index(value))

        elif index.column() == 1:
            editor.setText(str(value))

        elif index.column() == 2:
            editor.setTime(value)

QAbstractTableModel:

class TableModel(QAbstractTableModel):
    def __init__(self, data):
        super(TableModel, self).__init__()
        self._data = data

    def data(self, index, role):
        pass

    def rowCount(self, index=None):
        return len(self._data)

    def columnCount(self, index=None):
        return len(self._data[0])

主要：

class MainWindow(QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)

        localWidget = QWidget()

        self.table = QTableView(localWidget)

        data = [["1", "Hi", QTime(2, 1)], ["2", "Hello", QTime(3, 0)]]

        self.model = TableModel(data)
        self.table.setModel(self.model)
        self.table.setItemDelegate(Delegate())

        self.add_row = QPushButton("Add Row", localWidget)
        self.add_row.clicked.connect(self.addRow)

        for row in range(self.model.rowCount()):
            for column in range(self.model.columnCount()):
                index = self.model.index(row, column)
                self.table.openPersistentEditor(index)

        layout_v = QVBoxLayout()
        layout_v.addWidget(self.table)
        layout_v.addWidget(self.add_row)
        localWidget.setLayout(layout_v)
        self.setCentralWidget(localWidget)
        self.show()

    def addRow(self):

        new_row_data = ["3", "Howdy", QTime(9, 0)]

        self.model.beginInsertRows(QModelIndex(), self.model.rowCount(), self.model.rowCount())
        self.model._data.append(new_row_data)
        self.model.endInsertRows()
        for i in range(len(new_row_data)):
            index = self.table.model().index(self.model.rowCount()-1, i)
            self.table.edit(index)

app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())

如何触发 QItemDelegate 的 createEditor 为添加的行的项目创建小部件并使用 setEditorData 填充它们？

Answer 1

首先，您可以像在 __init__ 中那样使用 openPersistentEditor。

self.table.edit()中的错误有两个原因：

为了允许通过 edit() 编辑项目，必须覆盖 flags() 函数并提供 Qt.ItemIsEditable 标志；
您不能在同一个函数的不同索引上多次调用 edit()；

那么，你的代码还有其他重要的问题：

您没有正确使用该模型，因为 data() 未实现；
代表在提供标准行为时应使用模型的基本功能（访问 index.model()._data 不好）；
setEditorData是不必要的，只要尊重以上几个方面：Qt自动根据数据类型和编辑器设置数据class;
setData() 应该实现以便正确设置模型上的数据，否则将无法访问新数据；
模型结构的更改（如创建新行）应在模型中完成 class；

这是您的代码的修订版：

class Delegate(QItemDelegate):
    def __init__(self):
        QItemDelegate.__init__(self)
        self.type_items = ["1", "2", "3"]

    def createEditor(self, parent, option, index):
        if index.column() == 0:
            comboBox = QComboBox(parent)
            for text in self.type_items:
                comboBox.addItem(text, (index.row(), index.column()))
            return comboBox
        # no need to check for the other columns, as Qt automatically creates a
        # QLineEdit for string values and QTimeEdit for QTime values;
        return super().createEditor(parent, option, index)

    # no setEditorData() required


class TableModel(QAbstractTableModel):
    def __init__(self, data):
        super(TableModel, self).__init__()
        self._data = data

    def appendRowData(self, data):
        self.beginInsertRows(QModelIndex(), self.rowCount(), self.rowCount())
        self._data.append(data)
        self.endInsertRows()

    def data(self, index, role=Qt.DisplayRole):
        if role in (Qt.DisplayRole, Qt.EditRole):
            return self._data[index.row()][index.column()]

    def setData(self, index, value, role=Qt.EditRole):
        if role == Qt.EditRole:
            self._data[index.row()][index.column()] = value
            self.dataChanged.emit(index, index)
            return True
        return False

    def rowCount(self, index=None):
        return len(self._data)

    def columnCount(self, index=None):
        return len(self._data[0])

    def flags(self, index):
        # allow editing of the index
        return super().flags(index) | Qt.ItemIsEditable


class MainWindow(QMainWindow):
    # ...
    def addRow(self):
        row = self.model.rowCount()

        new_row_data = ["3", "Howdy", QTime(9, 0)]
        self.model.appendRowData(new_row_data)

        for i in range(self.model.columnCount()):
            index = self.model.index(row, i)
            self.table.openPersistentEditor(index)

使用模型和委托小部件将行添加到 QTableView

Adding row to QTableView with model and and delegate widgets

python

pyqt

pyside

qabstracttablemodel

qitemdelegate