使用模型和委托小部件向 QTableView 添加行 [英] Adding row to QTableView with model and and delegate widgets

问题描述

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

I am trying to add a row to QTableView with a QAbstractTableModel and QItemDelegate where the widgets appear in the added row. From what I've read I need to call .edit(index) on each item of the added row to call createEditor where the widgets are created however I am getting edit: editing failed

QItemDelegate:

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:

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])

主要内容:

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 为添加的行项目创建小部件并使用 setEditorData 填充它们?

How can I trigger the QItemDelegate's createEditor to create the widgets for the added row's items and setEditorData to populate them?

推荐答案

首先，您可以使用 openPersistentEditor，就像您在 __init__ 中所做的那样.

First of all, you could use openPersistentEditor as you already did in the __init__.

self.table.edit()报错的原因有两个:

1. 为了允许通过 edit() 编辑项目，flags() 函数必须被覆盖并提供 Qt.ItemIsEditable 标志；
2. 你不能在同一个函数的不同索引上多次调用edit()；

1. in order to allow editing of an item through edit(), the flags() function must be overridden and provide the Qt.ItemIsEditable flag;
2. you cannot call edit() multiple times on different indexes within the same function;

然后，您的代码中还有其他重要问题:

Then, there are other important problems in your code:

• 您没有正确使用模型，因为 data() 没有实现；
• 只要提供标准行为(访问 index.model()._data 不好)，代理就应该使用模型的基本函数；
• setEditorData 没有必要，只要尊重以上几个方面:Qt根据数据类型和编辑器类自动设置数据；
• setData() 应该实现以正确设置模型上的数据，否则将无法访问新数据；
• 模型结构的改变(比如创建一个新行)应该在模型类中完成；

• you're not correctly using the model, as data() is not implemented;
• the delegates should use the base functions of the model whenever they provide standard behavior (accessing index.model()._data is not good);
• setEditorData is unnecessary, as long as the above aspects are respected: Qt automatically sets the data based on the data type and the editor class;
• setData() should be implemented in order to correctly set the data on the model, otherwise the new data won't be accessible;
• changes in the model structure (like creating a new row) should be done in the model class;

这是您的代码的修订版:

Here is a revised version of your code:

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)

这篇关于使用模型和委托小部件向 QTableView 添加行的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！