使用PySide2和QTableView，如何使用pandas模型在表视图中获取多个委托？

Question

我尝试了所有我能想到的，并查看了几百个关于表和委托的堆栈溢出问题，并在我的脑海中挠了几小时，试图了解C++语言的文档，我没有读清楚地说明，有多少委托表的视图可以采取而不采取，现在我希望我能说，我已经对pyside2和pyqt5中的basic有了坚实的理解，尤其是对表格和模型，但学员们有点难以置信，我是根据人们的问题（主要是堆栈溢出）得出这一结论的，所以这是我第一次尝试寻求帮助

import pandas as pd
from PySide2 import QtWidgets

from PySide2.QtCore import (Qt, QAbstractTableModel, QModelIndex, QEvent, QPersistentModelIndex, 
                            QSortFilterProxyModel,
                            QTimer, Slot)
from PySide2.QtWidgets import QTableView, QAbstractItemView, QComboBox, QItemDelegate


class ScheduleModel(QAbstractTableModel):

    def __init__(self, schedules_list=None, parent=None):
        super(ScheduleModel, self).__init__(parent)

        if schedules_list is None:
            self.schedules_list = []
        else:
            self.schedules_list = schedules_list

    def rowCount(self, index=QModelIndex()):
        return self.schedules_list.shape[0]

    def columnCount(self, index=QModelIndex()):
        return self.schedules_list.shape[1]

    def data(self, index, role=Qt.DisplayRole):
        col = index.column()
        if index.isValid():
            if role == Qt.DisplayRole:
                value = self.schedules_list.iloc[index.row(), index.column()]
                return str(self.schedules_list.iloc[index.row(), index.column()])
        return None

    def headerData(self, section, orientation, role):
        # section is the index of the column/row.
        if orientation == Qt.Horizontal and role == Qt.DisplayRole:
            return self.schedules_list.columns[section]

        if orientation == Qt.Vertical:
            return str(self.schedules_list.index[section])

    def setData(self, index, value, role=Qt.EditRole):
        if role != Qt.EditRole:
            return False

        if index.isValid() and 0 <= index.row() < len(self.schedules_list):
            self.schedules_list.iloc[index.row(), index.column()] = value
            if self.data(index, Qt.DisplayRole) == value:
                self.dataChanged.emit(index, index, (Qt.EditRole,))
                return True
        return False

    def flags(self, index):
        if 1 <= index.column() <= 7:
            return Qt.ItemIsEnabled | Qt.ItemIsSelectable | Qt.ItemIsEditable
        if index.column() == 5:
            return Qt.ItemIsEditable | Qt.ItemIsUserCheckable | Qt.ItemIsSelectable
        elif index.column() == 1 and index.column() == 7:
            return Qt.DecorationRole
        else:
            return Qt.ItemIsSelectable


class ClickDelegate(QtWidgets.QStyledItemDelegate):
    blankText = '<Click here to add path>'

    def openFileDialog(self, lineEdit):
        if not self.blankText.startswith(lineEdit.text()):
            currentPath = lineEdit.text()
        else:
            currentPath = ''
        path, _ = QtWidgets.QFileDialog.getOpenFileName(lineEdit.window(),
                                                        'Select file', currentPath)
        if path:
            lineEdit.setText(path)

    def createEditor(self, parent, option, index):
        editor = QtWidgets.QWidget(parent)

        layout = QtWidgets.QHBoxLayout(editor)
        layout.setContentsMargins(0, 0, 0, 0)
        layout.setSpacing(0)

        editor.lineEdit = QtWidgets.QLineEdit(self.blankText)
        layout.addWidget(editor.lineEdit)
        editor.setFocusProxy(editor.lineEdit)
        editor.lineEdit.installEventFilter(self)

        button = QtWidgets.QToolButton(text='...')
        layout.addWidget(button)
        button.setFocusPolicy(Qt.NoFocus)
        button.clicked.connect(lambda: self.openFileDialog(editor.lineEdit))
        return editor

    def setEditorData(self, editor, index):
        if index.data():
            editor.lineEdit.setText(str(index.data()))
        editor.lineEdit.selectAll()

    def setModelData(self, editor, model, index):
        if not editor.lineEdit.text():
            model.setData(index, None)
        elif not self.blankText.startswith(editor.lineEdit.text()):
            model.setData(index, editor.lineEdit.text())

    def initStyleOption(self, option, index):
        super(ClickDelegate, self).initStyleOption(option, index)

        if not option.text:
            option.text = self.blankText

    def eventFilter(self, source, event):
        if isinstance(source, QtWidgets.QLineEdit):
            if (event.type() == QEvent.MouseButtonPress and
                    source.hasSelectedText() and
                    self.blankText.startswith(source.text())):
                res = super(ClickDelegate, self).eventFilter(source, event)
                source.clear()
                return res
            elif event.type() == QEvent.KeyPress and event.key() in (
                    Qt.Key_Escape, Qt.Key_Tab, Qt.Key_Backtab):
                return False
        return super(ClickDelegate, self).eventFilter(source, event)

    def checkIndex(self, table, index):
        if index in table.selectedIndexes() and index == table.currentIndex():
            table.edit(index)

    def editorEvent(self, event, model, option, index):
        if (event.type() == QEvent.MouseButtonPress and
                event.button() == Qt.LeftButton and
                index in option.widget.selectedIndexes()):
            table = option.widget
            QTimer.singleShot(0, lambda: self.checkIndex(table, index))
        return super(ClickDelegate, self).editorEvent(event, model, option, index)


class CheckBoxDelegate(QtWidgets.QItemDelegate):
    """
    A delegate that places a fully functioning QCheckBox cell of the column to which it's applied.
    """

    def __init__(self, parent):
        QtWidgets.QItemDelegate.__init__(self, parent)

    def createEditor(self, parent, option, index):
        """
        Important, otherwise an editor is created if the user clicks in this cell.
        """
        return None

    def paint(self, painter, option, index):
        """
        Paint a checkbox without the label.
        """
        self.drawCheck(painter, option, option.rect,
                       Qt.Unchecked if int(index.data()) == 0 else Qt.Checked)

    def editorEvent(self, event, model, option, index):
        '''
        Change the data in the model and the state of the checkbox
        if the user presses the left mousebutton and this cell is editable. Otherwise do nothing.
        '''
        if not int(index.flags() and Qt.ItemIsEditable) > 0:
            return False

        if event.type() == QEvent.MouseButtonRelease and event.button() == Qt.LeftButton:
            # Change the checkbox-state
            self.setModelData(None, model, index)
            return True

        return False

    def setModelData(self, editor, model, index):
        '''
        The user wanted to change the old state in the opposite.
        '''
        model.setData(index, 1 if int(index.data()) == 0 else 0, Qt.EditRole)


class DoubleSpinBoxDelegate(QtWidgets.QStyledItemDelegate):
    """A delegate class displaying a double spin box."""

    def __init__(self, parent=None, minimum=0.0, maximum=100.0, step=0.01):
        QtWidgets.QStyledItemDelegate.__init__(self, parent)
        self._min = minimum
        self._max = maximum
        self._step = step

    def createEditor(self, parent, option, index):
        editor = QtWidgets.QDoubleSpinBox(parent)
        editor.setMinimum(self._min)
        editor.setMaximum(self._max)
        editor.setSingleStep(self._step)
        editor.setAccelerated(True)
        editor.installEventFilter(self)
        return editor

    def setEditorData(self, spinBox, index):
        value = float(index.model().data(index, Qt.DisplayRole))
        spinBox.setValue(value)

    def setModelData(self, spinBox, model, index):
        value = spinBox.value()
        model.setData(index, value)

    def updateEditorGeometry(self, editor, option, index):
        editor.setGeometry(option.rect)


class ComboBoxDelegate(QItemDelegate):
    def __init__(self, parent=None):
        super(ComboBoxDelegate, self).__init__(parent)
        self.items = []

    def setItems(self, items):
        self.items = items

    def createEditor(self, parent, option, index):
        combo = QComboBox(parent)
        li = []
        for item in self.items:
            li.append(item)
        combo.addItems(li)
        combo.currentIndexChanged.connect(self.currentIndexChanged)
        return combo

    def setEditorData(self, editor, index):
        editor.blockSignals(True)
        text = index.model().data(index, Qt.DisplayRole)
        try:
            i = self.items.index(text)
        except ValueError:
            i = 0
        editor.setCurrentIndex(i)

    def setModelData(self, editor, model, index):
        # model.setData(index, editor.currentIndex(), Qt.EditRole)
        model.setData(index, editor.currentText())

    def updateEditorGeometry(self, editor, option, index):
        editor.setGeometry(option.rect)

    @Slot()
    def currentIndexChanged(self):
        self.commitData.emit(self.sender())


class SchedulesViewer(QTableView):
    # selectionChanged = Signal(QItemSelection)
    # data_changed = Signal(QModelIndex, QModelIndex)

    def __init__(self, parent=None):
        QTableView.__init__(self, parent)

        # self.setContextMenuPolicy(Qt.CustomContextMenu)
        # self.customContextMenuRequested.connect(self.schedule_context_menu)
        address = {'idx': '1',
                   'presets': 'presets',
                   'selected_source': 'get_source',
                   'selected_destinations': 'selected_destinations',
                   'interval': '0400',
                   'active': '1',
                   'priority': 'high',
                   'categories': 'programming',
                   'last_total': '222',
                   }

        self.schedule_model = ScheduleModel(pd.DataFrame([address]))

        self.proxyModel = QSortFilterProxyModel(self)
        self.proxyModel.setSourceModel(self.schedule_model)
        self.proxyModel.setDynamicSortFilter(True)

        self.setModel(self.proxyModel)

        **"""
        HAVING LIMITS TO THE AMOUNT OF WIDGETS TABLE VIEW CAN HANDEL
        """
        dialog_delegate = ClickDelegate(self)
        self.setItemDelegateForColumn(2, dialog_delegate)
        self.setItemDelegateForColumn(3, dialog_delegate)

        # spin_delegate = DoubleSpinBoxDelegate()
        # self.setItemDelegateForColumn(4, spin_delegate)

        # CheckBox = CheckBoxDelegate(None)
        # self.setItemDelegateForColumn(5, CheckBox)

        data = ['programming', 'game_build', 'other']
        combo_delegate = ComboBoxDelegate()
        combo_delegate.setItems([str(row) for row in data])
        self.setItemDelegateForColumn(6, combo_delegate)**

        self.setSortingEnabled(True)
        self.setSelectionBehavior(QAbstractItemView.SelectRows)
        self.horizontalHeader().setStretchLastSection(True)
        self.verticalHeader().hide()
        self.setSelectionMode(QAbstractItemView.SingleSelection)
        self.proxyModel.sort(0, Qt.AscendingOrder)
        self.setSelectionBehavior(QAbstractItemView.SelectRows)
        self.setEditTriggers(QAbstractItemView.DoubleClicked)

        self.setSelectionMode(QAbstractItemView.SingleSelection)

        # self.selectionModel().selectionChanged.connect(self.selectionChanged)

        self.show()


if __name__ == "__main__":
    import sys
    from PySide2.QtWidgets import QApplication

    app = QApplication(sys.argv)
    addressWidget = SchedulesViewer()
    addressWidget.show()
    sys.exit(app.exec_())

所以请有人帮我理解我遗漏了什么或不理解什么，我想要实现的就是添加已散列的代理，并使其成为一个可编辑的表，但是，如果我添加spinbox或checkbox委托，应用程序将冻结并崩溃，那么对于表视图可以处理多少委托，或者我做错了什么，是否有限制？如果您有任何帮助，我们将不胜感激，并提前向您表示感谢

Answer 1

感谢musicamante如此频繁地指出了我的一个简单错误，那就是忽略了太自我的明显缺失，使所有代表都成为实例的成员，我已经测试过了，它可以工作，所以代码如下

import pandas as pd
from PySide2 import QtWidgets

from PySide2.QtCore import (Qt, QAbstractTableModel, QModelIndex, QEvent, 
                            QPersistentModelIndex,
                            QSortFilterProxyModel,
                            QTimer, Slot)
from PySide2.QtWidgets import QTableView, QAbstractItemView, QComboBox, QItemDelegate


class ScheduleModel(QAbstractTableModel):

    def __init__(self, schedules_list=None, parent=None):
        super(ScheduleModel, self).__init__(parent)

        if schedules_list is None:
            self.schedules_list = []
        else:
            self.schedules_list = schedules_list

    def rowCount(self, index=QModelIndex()):
        return self.schedules_list.shape[0]

    def columnCount(self, index=QModelIndex()):
        return self.schedules_list.shape[1]

    def data(self, index, role=Qt.DisplayRole):
        col = index.column()
        if index.isValid():
            if role == Qt.DisplayRole:
                value = self.schedules_list.iloc[index.row(), index.column()]
                return str(self.schedules_list.iloc[index.row(), index.column()])
        return None

    def headerData(self, section, orientation, role):
        # section is the index of the column/row.
        if orientation == Qt.Horizontal and role == Qt.DisplayRole:
            return self.schedules_list.columns[section]

        if orientation == Qt.Vertical:
            return str(self.schedules_list.index[section])

    def setData(self, index, value, role=Qt.EditRole):
        if role != Qt.EditRole:
            return False

        if index.isValid() and 0 <= index.row() < len(self.schedules_list):
            self.schedules_list.iloc[index.row(), index.column()] = value
            if self.data(index, Qt.DisplayRole) == value:
                self.dataChanged.emit(index, index, (Qt.EditRole,))
                return True
        return False

    def flags(self, index):
        if 1 <= index.column() <= 7:
            return Qt.ItemIsEnabled | Qt.ItemIsSelectable | Qt.ItemIsEditable
        if index.column() == 5:
            return Qt.ItemIsEditable | Qt.ItemIsUserCheckable | Qt.ItemIsSelectable
        elif index.column() == 1 and index.column() == 7:
            return Qt.DecorationRole
        else:
            return Qt.ItemIsSelectable


class ClickDelegate(QtWidgets.QStyledItemDelegate):
    blankText = '<Click here to add path>'

    def openFileDialog(self, lineEdit):
        if not self.blankText.startswith(lineEdit.text()):
            currentPath = lineEdit.text()
        else:
            currentPath = ''
        path, _ = QtWidgets.QFileDialog.getOpenFileName(lineEdit.window(),
                                                        'Select file', currentPath)
        if path:
            lineEdit.setText(path)

    def createEditor(self, parent, option, index):
        editor = QtWidgets.QWidget(parent)

        layout = QtWidgets.QHBoxLayout(editor)
        layout.setContentsMargins(0, 0, 0, 0)
        layout.setSpacing(0)

        editor.lineEdit = QtWidgets.QLineEdit(self.blankText)
        layout.addWidget(editor.lineEdit)
        editor.setFocusProxy(editor.lineEdit)
        editor.lineEdit.installEventFilter(self)

        button = QtWidgets.QToolButton(text='...')
        layout.addWidget(button)
        button.setFocusPolicy(Qt.NoFocus)
        button.clicked.connect(lambda: self.openFileDialog(editor.lineEdit))
        return editor

    def setEditorData(self, editor, index):
        if index.data():
            editor.lineEdit.setText(str(index.data()))
        editor.lineEdit.selectAll()

    def setModelData(self, editor, model, index):
        if not editor.lineEdit.text():
            model.setData(index, None)
        elif not self.blankText.startswith(editor.lineEdit.text()):
            model.setData(index, editor.lineEdit.text())

    def initStyleOption(self, option, index):
        super(ClickDelegate, self).initStyleOption(option, index)

        if not option.text:
            option.text = self.blankText

    def eventFilter(self, source, event):
        if isinstance(source, QtWidgets.QLineEdit):
            if (event.type() == QEvent.MouseButtonPress and
                    source.hasSelectedText() and
                    self.blankText.startswith(source.text())):
                res = super(ClickDelegate, self).eventFilter(source, event)
                source.clear()
                return res
            elif event.type() == QEvent.KeyPress and event.key() in (
                    Qt.Key_Escape, Qt.Key_Tab, Qt.Key_Backtab):
                return False
        return super(ClickDelegate, self).eventFilter(source, event)

    def checkIndex(self, table, index):
        if index in table.selectedIndexes() and index == table.currentIndex():
            table.edit(index)

    def editorEvent(self, event, model, option, index):
        if (event.type() == QEvent.MouseButtonPress and
                event.button() == Qt.LeftButton and
                index in option.widget.selectedIndexes()):
            table = option.widget
            QTimer.singleShot(0, lambda: self.checkIndex(table, index))
        return super(ClickDelegate, self).editorEvent(event, model, option, index)


class CheckBoxDelegate(QtWidgets.QItemDelegate):
    """
    A delegate that places a fully functioning QCheckBox cell of the column to which 
    it's applied.
    """

    def __init__(self, parent):
        QtWidgets.QItemDelegate.__init__(self, parent)

    def createEditor(self, parent, option, index):
        """
        Important, otherwise an editor is created if the user clicks in this cell.
        """
        return None

    def paint(self, painter, option, index):
        """
        Paint a checkbox without the label.
        """
        self.drawCheck(painter, option, option.rect,
                       Qt.Unchecked if int(index.data()) == 0 else Qt.Checked)

    def editorEvent(self, event, model, option, index):
        '''
        Change the data in the model and the state of the checkbox
        if the user presses the left mousebutton and this cell is editable. Otherwise 
        do nothing.
        '''
        if not int(index.flags() and Qt.ItemIsEditable) > 0:
            return False

        if event.type() == QEvent.MouseButtonRelease and event.button() == 
            Qt.LeftButton:
            # Change the checkbox-state
            self.setModelData(None, model, index)
            return True

        return False

    def setModelData(self, editor, model, index):
        '''
        The user wanted to change the old state in the opposite.
        '''
        model.setData(index, 1 if int(index.data()) == 0 else 0, Qt.EditRole)


class DoubleSpinBoxDelegate(QtWidgets.QStyledItemDelegate):
    """A delegate class displaying a double spin box."""

    def __init__(self, parent=None, minimum=0.0, maximum=100.0, step=0.01):
        QtWidgets.QStyledItemDelegate.__init__(self, parent)
        self._min = minimum
        self._max = maximum
        self._step = step

    def createEditor(self, parent, option, index):
        editor = QtWidgets.QDoubleSpinBox(parent)
        editor.setMinimum(self._min)
        editor.setMaximum(self._max)
        editor.setSingleStep(self._step)
        editor.setAccelerated(True)
        editor.installEventFilter(self)
        return editor

    def setEditorData(self, spinBox, index):
        value = float(index.model().data(index, Qt.DisplayRole))
        spinBox.setValue(value)

    def setModelData(self, spinBox, model, index):
        value = spinBox.value()
        model.setData(index, value)

    def updateEditorGeometry(self, editor, option, index):
        editor.setGeometry(option.rect)


class ComboBoxDelegate(QItemDelegate):
    def __init__(self, parent=None):
        super(ComboBoxDelegate, self).__init__(parent)
        self.items = []

    def setItems(self, items):
        self.items = items

    def createEditor(self, parent, option, index):
        combo = QComboBox(parent)
        li = []
        for item in self.items:
            li.append(item)
        combo.addItems(li)
        combo.currentIndexChanged.connect(self.currentIndexChanged)
        return combo

    def setEditorData(self, editor, index):
        editor.blockSignals(True)
        text = index.model().data(index, Qt.DisplayRole)
        try:
            i = self.items.index(text)
        except ValueError:
            i = 0
        editor.setCurrentIndex(i)

    def setModelData(self, editor, model, index):
        # model.setData(index, editor.currentIndex(), Qt.EditRole)
        model.setData(index, editor.currentText())

    def updateEditorGeometry(self, editor, option, index):
        editor.setGeometry(option.rect)

    @Slot()
    def currentIndexChanged(self):
        self.commitData.emit(self.sender())


class SchedulesViewer(QTableView):
    # selectionChanged = Signal(QItemSelection)
    # data_changed = Signal(QModelIndex, QModelIndex)

    def __init__(self, parent=None):
        QTableView.__init__(self, parent)

        # self.setContextMenuPolicy(Qt.CustomContextMenu)
        # self.customContextMenuRequested.connect(self.schedule_context_menu)
        address = {'idx': '1',
                   'presets': 'presets',
                   'selected_source': 'get_source',
                   'selected_destinations': 'selected_destinations',
                   'interval': '0400',
                   'active': '1',
                   'priority': 'high',
                   'categories': 'programming',
                   'last_total': '222',
                   }

        self.schedule_model = ScheduleModel(pd.DataFrame([address]))

        self.proxyModel = QSortFilterProxyModel(self)
        self.proxyModel.setSourceModel(self.schedule_model)
        self.proxyModel.setDynamicSortFilter(True)

        self.setModel(self.proxyModel)

        """
        HAVING LIMITS TO THE AMOUNT OF WIDGETS TABLE VIEW CAN HANDEL
        """

        self.setItemDelegateForColumn(2, ClickDelegate(self))
        self.setItemDelegateForColumn(3, ClickDelegate(self))

        self.setItemDelegateForColumn(4, DoubleSpinBoxDelegate(self))

        self.setItemDelegateForColumn(5, CheckBoxDelegate(self))

        data = ['programming', 'game_build', 'other']
        combo_delegate = ComboBoxDelegate(self)
        combo_delegate.setItems([str(row) for row in data])
        self.setItemDelegateForColumn(6, combo_delegate)

        self.setSortingEnabled(True)
        self.setSelectionBehavior(QAbstractItemView.SelectRows)
        self.horizontalHeader().setStretchLastSection(True)
        self.verticalHeader().hide()
        self.setSelectionMode(QAbstractItemView.SingleSelection)
        self.proxyModel.sort(0, Qt.AscendingOrder)
        self.setSelectionBehavior(QAbstractItemView.SelectRows)
        self.setEditTriggers(QAbstractItemView.DoubleClicked)

        self.setSelectionMode(QAbstractItemView.SingleSelection)

        # self.selectionModel().selectionChanged.connect(self.selectionChanged)

        self.show()


if __name__ == "__main__":
    import sys
    from PySide2.QtWidgets import QApplication

    app = QApplication(sys.argv)
    addressWidget = SchedulesViewer()
    addressWidget.show()
    sys.exit(app.exec_())