PyQt-QTableVi中组合框的最简单工作示例

Question

背景：在QTableView中找不到组合框的完整工作示例。所以我写这段代码是基于其他几个更为复杂的例子。但是，问题是，这个示例要求您在启用组合框之前双击它，然后您必须再次单击以将其下拉。不太方便使用。如果我使用QTableWidget执行非模型/视图操作，则第一次单击时组合框将下拉。

问题有人能看看这个问题，告诉我需要做些什么才能让它像QTableWidget那样做出响应吗？另外，如果有什么我正在做的是不必要的，请注明。例如，是否绝对有必要引用应用程序样式？

import sys
from PyQt4 import QtGui, QtCore

rows = "ABCD"
choices = ['apple', 'orange', 'banana']

class Delegate(QtGui.QItemDelegate):
    def __init__(self, owner, items):
        super(Delegate, self).__init__(owner)
        self.items = items
    def createEditor(self, parent, option, index):
        self.editor = QtGui.QComboBox(parent)
        self.editor.addItems(self.items)
        return self.editor
    def paint(self, painter, option, index):
        value = index.data(QtCore.Qt.DisplayRole).toString()
        style = QtGui.QApplication.style()
        opt = QtGui.QStyleOptionComboBox()
        opt.text = str(value)
        opt.rect = option.rect
        style.drawComplexControl(QtGui.QStyle.CC_ComboBox, opt, painter)
        QtGui.QItemDelegate.paint(self, painter, option, index)
    def setEditorData(self, editor, index):
        value = index.data(QtCore.Qt.DisplayRole).toString()
        num = self.items.index(value)
        editor.setCurrentIndex(num)
    def setModelData(self, editor, model, index):
        value = editor.currentText()
        model.setData(index, QtCore.Qt.DisplayRole, QtCore.QVariant(value))
    def updateEditorGeometry(self, editor, option, index):
        editor.setGeometry(option.rect)

class Model(QtCore.QAbstractTableModel):
    def __init__(self):
        super(Model, self).__init__()
        self.table = [[row, choices[0]] for row in rows]
    def rowCount(self, index=QtCore.QModelIndex()):
        return len(self.table)
    def columnCount(self, index=QtCore.QModelIndex()):
        return 2
    def flags(self, index):
        return QtCore.Qt.ItemIsEditable | QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsSelectable
    def data(self, index, role):
        if role == QtCore.Qt.DisplayRole:
            return self.table[index.row()][index.column()]
    def setData(self, index, role, value):
        if role == QtCore.Qt.DisplayRole:
            self.table[index.row()][index.column()] = value

class Main(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(Main, self).__init__(parent)
        self.model = Model()
        self.table = QtGui.QTableView()
        self.table.setModel(self.model)
        self.table.setItemDelegateForColumn(1, Delegate(self, ["apple", "orange", "banana"]))
        self.setCentralWidget(self.table)
        self.setWindowTitle('Delegate Test')
        self.show()

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    main = Main()
    app.exec_()

Answer 1

使用QTableWiget.setCellWidget

import sys
from PyQt4 import QtGui
app = QtGui.QApplication(sys.argv)
table = QtGui.QTableWidget(1,1)
combobox = QtGui.QComboBox()
combobox.addItem("Combobox item")
table.setCellWidget(0,0, combobox)
table.show()
app.exec()

Answer 2

如果有人感兴趣，下面是为PyQt5和Python 3修改的相同示例。关键更新包括：

• Python3:super().__init__()
• PyQt5:大多数类位于QtWidgets；本例不需要QtGui
• Model.setData：输入参数顺序更改为：index, value, role，并返回True，而不是None
• 组合框choices和表内容现在在Main中指定；这使Delegate和Model更通用

from PyQt5 import QtWidgets, QtCore

class Delegate(QtWidgets.QItemDelegate):
    def __init__(self, owner, choices):
        super().__init__(owner)
        self.items = choices
    def createEditor(self, parent, option, index):
        self.editor = QtWidgets.QComboBox(parent)
        self.editor.addItems(self.items)
        return self.editor
    def paint(self, painter, option, index):
        value = index.data(QtCore.Qt.DisplayRole)
        style = QtWidgets.QApplication.style()
        opt = QtWidgets.QStyleOptionComboBox()
        opt.text = str(value)
        opt.rect = option.rect
        style.drawComplexControl(QtWidgets.QStyle.CC_ComboBox, opt, painter)
        QtWidgets.QItemDelegate.paint(self, painter, option, index)
    def setEditorData(self, editor, index):
        value = index.data(QtCore.Qt.DisplayRole)
        num = self.items.index(value)
        editor.setCurrentIndex(num)
    def setModelData(self, editor, model, index):
        value = editor.currentText()
        model.setData(index, QtCore.Qt.DisplayRole, QtCore.QVariant(value))
    def updateEditorGeometry(self, editor, option, index):
        editor.setGeometry(option.rect)

class Model(QtCore.QAbstractTableModel):
    def __init__(self, table):
        super().__init__()
        self.table = table
    def rowCount(self, parent):
        return len(self.table)
    def columnCount(self, parent):
        return len(self.table[0])
    def flags(self, index):
        return QtCore.Qt.ItemIsEditable | QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsSelectable
    def data(self, index, role):
        if role == QtCore.Qt.DisplayRole:
            return self.table[index.row()][index.column()]
    def setData(self, index, value, role):
        if role == QtCore.Qt.EditRole:
            self.table[index.row()][index.column()] = value
        return True

class Main(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        # set combo box choices:
        choices = ['apple', 'orange', 'banana']
        # create table data:
        table   = []
        table.append(['A', choices[0]])
        table.append(['B', choices[0]])
        table.append(['C', choices[0]])
        table.append(['D', choices[0]])
        # create table view:
        self.model     = Model(table)
        self.tableView = QtWidgets.QTableView()
        self.tableView.setModel(self.model)
        self.tableView.setItemDelegateForColumn(1, Delegate(self,choices))
        # make combo boxes editable with a single-click:
        for row in range( len(table) ):
            self.tableView.openPersistentEditor(self.model.index(row, 1))
        # initialize
        self.setCentralWidget(self.tableView)
        self.setWindowTitle('Delegate Test')
        self.show()

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    main = Main()
    app.exec_()

Answer 3

如果试图在视图显示编辑器时进行调整，则需要更改qabstractemview中定义的编辑触发器。默认值是doubleClick上的edit，但我认为您需要的是QAbstractItemView.CurrentChanged。通过调用myView.setEditTrigger()来设置