QDataWidgetMapper;将TableWidget映射到模型

Question

我没有找到任何文档来说明QDataWidgetMapper实际用于哪些小部件，也没有找到与QTableWidget进行映射的任何实现。

它绝对适用于QLineEdit和QComboBoxes，它们是输入小部件，但是可以映射到QTableWidget吗？

目标是在添加到QUndostack时使用QUndoStack撤消/重做每个小部件中的文本更改。我希望能够撤消/重做QTableWidget以及QLineEdits和QComboBoxes中的项目的文本更改。

from PyQt5 import QtCore, QtGui, QtWidgets
import sys

class CommandTextEdit(QtWidgets.QUndoCommand):
    def __init__(self, window, index, oldText, newText, description):
        super(CommandTextEdit,self).__init__()
        self.index = index
        self.window = window
        self.oldText = oldText
        self.newText = newText

    def redo(self):
        self.index.model().itemDataChanged.disconnect(self.window.itemDataChangedSlot)
        self.index.model().setData(self.index, self.newText, QtCore.Qt.EditRole)
        self.index.model().itemDataChanged.connect(self.window.itemDataChangedSlot)

    def undo(self):
        self.index.model().itemDataChanged.disconnect(self.window.itemDataChangedSlot)
        self.index.model().setData(self.index, self.oldText, QtCore.Qt.EditRole)
        self.index.model().itemDataChanged.connect(self.window.itemDataChangedSlot)

class Model(QtCore.QAbstractListModel):
    itemDataChanged = QtCore.pyqtSignal(object,object, object, object)
    def __init__(self, text = [], parent = None):
        super(Model,self).__init__(parent)
        self._text = text

    def rowCount(self,parent=QtCore.QModelIndex()):
        return len(self._text)

    def data(self,index,role):
        row = index.row()
        if role == QtCore.Qt.EditRole:
            return self._text[row]

        if role == QtCore.Qt.DisplayRole:
            value = self._text[row]
            return self._text[row]

    def model(self):
        return self

    def flags(self, index):
        return QtCore.Qt.ItemIsEditable |QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsSelectable

    def setData(self, index, value, role = QtCore.Qt.UserRole + 1):
        if index.isValid():
           if role == QtCore.Qt.EditRole:
                oldValue = self.data(index,role)
                self._text[index.row()] = value
                self.dataChanged.emit(index, index)
                if oldValue != value:
                    self.itemDataChanged.emit(index, oldValue, value, role)
                return True
        return False

class Window(QtWidgets.QMainWindow):
    def __init__(self, parent = None):
        super(Window,self).__init__(parent)
        self.setCentralWidget(QtWidgets.QWidget(self))
        self.setWindowTitle('Widget Mapping GUI')
        mainlayout = QtWidgets.QVBoxLayout()
        #Information for widgets
        items = ["","H","N","M"]
        #LineEdit1
        self.labelLineEdit1 = QtWidgets.QLabel()
        self.labelLineEdit1.setText('LineEdit1')
        self.LineEdit1 = QtWidgets.QLineEdit()
        firstBox = QtWidgets.QHBoxLayout()
        firstBox.addWidget(self.labelLineEdit1)
        firstBox.addWidget(self.LineEdit1)
        #LineEdit2
        self.labelLineEdit2 = QtWidgets.QLabel()
        self.labelLineEdit2.setText('LineEdit2')
        self.LineEdit2 = QtWidgets.QLineEdit()
        secondBox = QtWidgets.QHBoxLayout()
        secondBox.addWidget(self.labelLineEdit2)
        secondBox.addWidget(self.LineEdit2)
        #ComboBox1
        self.labelComboBox1 = QtWidgets.QLabel()
        self.labelComboBox1.setText('ComboBox1')
        self.ComboBox1 = QtWidgets.QComboBox()
        self.ComboBox1.addItems(items)

        thirdBox = QtWidgets.QHBoxLayout()
        thirdBox.addWidget(self.labelComboBox1)
        thirdBox.addWidget(self.ComboBox1)
        #ComboBox2
        self.labelComboBox2 = QtWidgets.QLabel()
        self.labelComboBox2.setText('ComboBox2')
        self.ComboBox2 = QtWidgets.QComboBox()
        self.ComboBox2.addItems(items)

        fourthBox = QtWidgets.QHBoxLayout()
        fourthBox.addWidget(self.labelComboBox2)
        fourthBox.addWidget(self.ComboBox2)
        #TableWidget
        self.TableWidget = QtWidgets.QTableWidget(5,1)
        #Set header labels
        self.TableWidget.setHorizontalHeaderLabels(["Dimensions"])
        self.TableWidget.setVerticalHeaderLabels(["A","B","C","D","E"])
        self.TableWidget.setItem(0,1,QtWidgets.QTableWidgetItem('1'))

        fifthBox = QtWidgets.QVBoxLayout()
        fifthBox.addWidget(self.TableWidget)
        #Add Layouts
        mainlayout.addLayout(firstBox)
        mainlayout.addLayout(secondBox)
        mainlayout.addLayout(thirdBox)
        mainlayout.addLayout(fourthBox)
        mainlayout.addLayout(fifthBox)
        self.centralWidget().setLayout(mainlayout)
        #Model
        self.mapper = None
        self.model = Model(['','','','',''])
        self.setModel(self.model)
        #QUndoStack
        self.undoStack = QtWidgets.QUndoStack()
        self.stackView = QtWidgets.QUndoView(self.undoStack)
        self.stackView.setWindowTitle('StackView')
        self.stackView.show()
        #Run init methods
        self.createActions()
        self.makeConnections()
        self.listViewMethod()

    def createActions(self):
        self.UndoAct = QtWidgets.QAction("Undo", self)
        self.UndoAct.setShortcut(QtGui.QKeySequence.Undo)
        self.UndoAct.triggered.connect(self.undoStack.undo)
        self.RedoAct = QtWidgets.QAction("Redo", self)
        self.RedoAct.setShortcut(QtGui.QKeySequence.Redo)
        self.RedoAct.triggered.connect(self.undoStack.redo)
        self.toolbar = self.addToolBar('Exit')
        self.toolbar.addAction(self.UndoAct)
        self.toolbar.addAction(self.RedoAct)

    def listViewMethod(self):
        self.listView = QtWidgets.QListView()
        self.listView.setModel(self.model)
        self.listView.setWindowTitle('ListView')
        self.listView.show()

    def makeConnections(self):
        self.model.itemDataChanged.connect(self.itemDataChangedSlot)

    def setModel(self, model):
        self.mapper = QtWidgets.QDataWidgetMapper(self)
        self.mapper.setOrientation(QtCore.Qt.Vertical)
        self.mapper.setModel(self.model)
        self.mapper.addMapping(self.LineEdit1, 0)
        self.mapper.addMapping(self.LineEdit2, 1)
        self.mapper.addMapping(self.ComboBox1, 2)
        self.mapper.addMapping(self.ComboBox2, 3)
        self.mapper.addMapping(self.TableWidget,4)
        self.mapper.toFirst()

    def itemDataChangedSlot(self, index, oldValue, value, role):
        if role == QtCore.Qt.EditRole:
            command = CommandTextEdit(self, index, oldValue, value, "Text changed from '{0}' to '{1}'".format(oldValue, value))
            self.undoStack.push(command)

def main():
    app = QtWidgets.QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())



if __name__ == '__main__':
    main()

Answer 1

要映射setCellWidget的项目，我使用了from PyQt5 import QtCore, QtGui, QtWidgets import sys #implemented stylesheets for QLineEdit to imitate a QTableWidgetItem class CustomLineEdit(QtWidgets.QLineEdit): def __init__(self): super(CustomLineEdit,self).__init__() self.setReadOnly(True) self.setFrame(False) self.setStyleSheet("QLineEdit { border: none; } \n" \ "QLineEdit::focus {background-color: #3daee9;} \n"\ "QLineEdit::focus::pressed {background-color: none;} \n"\ "QLineEdit::hover {background-color: #3daee9;}" ) def mouseDoubleClickEvent(self,event): self.setReadOnly(False) self.setStyleSheet("QLineEdit { border: none; \nbackground-color: none;} \n" \ ) def focusOutEvent(self,event): self.setReadOnly(True) self.setStyleSheet("QLineEdit { border: none; } \n" \ "QLineEdit::focus {background-color: #3daee9;} \n"\ "QLineEdit::focus::pressed {background-color: none;} \n"\ "QLineEdit::hover {background-color: #3daee9;}" ) class CommandTextEdit(QtWidgets.QUndoCommand): def __init__(self, window, index, oldText, newText, description): super(CommandTextEdit,self).__init__() self.index = index self.window = window self.oldText = oldText self.newText = newText def redo(self): self.index.model().itemDataChanged.disconnect(self.window.itemDataChangedSlot) self.index.model().setData(self.index, self.newText, QtCore.Qt.EditRole) self.index.model().itemDataChanged.connect(self.window.itemDataChangedSlot) def undo(self): self.index.model().itemDataChanged.disconnect(self.window.itemDataChangedSlot) self.index.model().setData(self.index, self.oldText, QtCore.Qt.EditRole) self.index.model().itemDataChanged.connect(self.window.itemDataChangedSlot) class Model(QtCore.QAbstractListModel): itemDataChanged = QtCore.pyqtSignal(object,object, object, object) def __init__(self, text = [], parent = None): super(Model,self).__init__(parent) self._text = text def rowCount(self,parent=QtCore.QModelIndex()): return len(self._text) def data(self,index,role): row = index.row() if role == QtCore.Qt.EditRole: return self._text[row] if role == QtCore.Qt.DisplayRole: value = self._text[row] return self._text[row] def model(self): return self def flags(self, index): return QtCore.Qt.ItemIsEditable |QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsSelectable def setData(self, index, value, role = QtCore.Qt.UserRole + 1): if index.isValid(): if role == QtCore.Qt.EditRole: oldValue = self.data(index,role) self._text[index.row()] = value self.dataChanged.emit(index, index) if oldValue != value: self.itemDataChanged.emit(index, oldValue, value, role) return True return False class Window(QtWidgets.QMainWindow): def __init__(self, parent = None): super(Window,self).__init__(parent) self.setCentralWidget(QtWidgets.QWidget(self)) self.setWindowTitle('Widget Mapping GUI') mainlayout = QtWidgets.QVBoxLayout() #Information for widgets items = ["","H","N","M"] #LineEdit1 self.labelLineEdit1 = QtWidgets.QLabel() self.labelLineEdit1.setText('LineEdit1') self.LineEdit1 = QtWidgets.QLineEdit() firstBox = QtWidgets.QHBoxLayout() firstBox.addWidget(self.labelLineEdit1) firstBox.addWidget(self.LineEdit1) #LineEdit2 self.labelLineEdit2 = QtWidgets.QLabel() self.labelLineEdit2.setText('LineEdit2') self.LineEdit2 = QtWidgets.QLineEdit() secondBox = QtWidgets.QHBoxLayout() secondBox.addWidget(self.labelLineEdit2) secondBox.addWidget(self.LineEdit2) #ComboBox1 self.labelComboBox1 = QtWidgets.QLabel() self.labelComboBox1.setText('ComboBox1') self.ComboBox1 = QtWidgets.QComboBox() self.ComboBox1.addItems(items) thirdBox = QtWidgets.QHBoxLayout() thirdBox.addWidget(self.labelComboBox1) thirdBox.addWidget(self.ComboBox1) #ComboBox2 self.labelComboBox2 = QtWidgets.QLabel() self.labelComboBox2.setText('ComboBox2') self.ComboBox2 = QtWidgets.QComboBox() self.ComboBox2.addItems(items) fourthBox = QtWidgets.QHBoxLayout() fourthBox.addWidget(self.labelComboBox2) fourthBox.addWidget(self.ComboBox2) #TableWidget self.TableWidget = QtWidgets.QTableWidget(5,1) #Set header labels self.TableWidget.setHorizontalHeaderLabels(["Dimensions"]) self.TableWidget.setVerticalHeaderLabels(["A","B","C","D","E"]) self.TableWidget.setCellWidget(0,0,CustomLineEdit()) self.TableWidget.setCellWidget(1,0,CustomLineEdit()) self.TableWidget.setCellWidget(2,0,CustomLineEdit()) self.TableWidget.setCellWidget(3,0,CustomLineEdit()) self.TableWidget.setCellWidget(4,0,CustomLineEdit()) self.TableWidget.setItem(1,0,QtWidgets.QTableWidgetItem('1')) fifthBox = QtWidgets.QVBoxLayout() fifthBox.addWidget(self.TableWidget) #Add Layouts mainlayout.addLayout(firstBox) mainlayout.addLayout(secondBox) mainlayout.addLayout(thirdBox) mainlayout.addLayout(fourthBox) mainlayout.addLayout(fifthBox) self.centralWidget().setLayout(mainlayout) #Model self.mapper = None self.model = Model(['' for i in range(9)]) self.setModel(self.model) #QUndoStack self.undoStack = QtWidgets.QUndoStack() self.stackView = QtWidgets.QUndoView(self.undoStack) self.stackView.setWindowTitle('StackView') self.stackView.show() #Run init methods self.createActions() self.makeConnections() self.listViewMethod() def createActions(self): self.UndoAct = QtWidgets.QAction("Undo", self) self.UndoAct.setShortcut(QtGui.QKeySequence.Undo) self.UndoAct.triggered.connect(self.undoStack.undo) self.RedoAct = QtWidgets.QAction("Redo", self) self.RedoAct.setShortcut(QtGui.QKeySequence.Redo) self.RedoAct.triggered.connect(self.undoStack.redo) self.toolbar = self.addToolBar('Exit') self.toolbar.addAction(self.UndoAct) self.toolbar.addAction(self.RedoAct) def listViewMethod(self): self.listView = QtWidgets.QListView() self.listView.setModel(self.model) self.listView.setWindowTitle('ListView') self.listView.show() def makeConnections(self): self.model.itemDataChanged.connect(self.itemDataChangedSlot) def setModel(self, model): self.mapper = QtWidgets.QDataWidgetMapper(self) self.mapper.setOrientation(QtCore.Qt.Vertical) self.mapper.setModel(self.model) self.mapper.addMapping(self.LineEdit1, 0) self.mapper.addMapping(self.LineEdit2, 1) self.mapper.addMapping(self.ComboBox1, 2) self.mapper.addMapping(self.ComboBox2, 3) self.mapper.addMapping(self.TableWidget.cellWidget(0,0), 4) self.mapper.addMapping(self.TableWidget.cellWidget(1,0), 5) self.mapper.addMapping(self.TableWidget.cellWidget(2,0), 6) self.mapper.addMapping(self.TableWidget.cellWidget(3,0), 7) self.mapper.addMapping(self.TableWidget.cellWidget(4,0), 8) self.mapper.toFirst() def itemDataChangedSlot(self, index, oldValue, value, role): if role == QtCore.Qt.EditRole: command = CommandTextEdit(self, index, oldValue, value, "Text changed from '{0}' to '{1}'".format(oldValue, value)) self.undoStack.push(command) def main(): app = QtWidgets.QApplication(sys.argv) window = Window() window.show() sys.exit(app.exec_()) if __name__ == '__main__': main() 方法使用自定义QLineEdit类将每个单元格映射到模型。

更新代码：

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