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Checkboxes in Combobox using PyQt

I need to implement a drop-down list containing CheckBoxes, as well as the entries in the ComboBox that are CheckBoxes. But QComboBox does not accept QCheckBox as its member, and I could not find an alternative solution. I found an implementation in C ++ in the Qt Wiki, but I don’t know how to port it to python.

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When I needed it, I came up with an easier solution (at least not necessarily a subclass of QCombobox). It worked for me. This will create a menu with verified actions and set it to a button. Then connect either the menu or the actions to the slot.

Qt ( PyQt, , , , ) - :

QMenu *menu = new QMenu;
QAction *Act1 = new QAction("Action 1", menu);
Act1->setCheckable(true);
QAction *Act2 = new QAction("Action 2", menu);
Act2->setCheckable(true);
menu->addAction(Act1);
menu->addAction(Act2);

QPushButton *btn = new QPushButton("Btn");    
btn->setMenu(menu);

,

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( ) - PyQt, :

, Qt.CheckStateRole SetData Qt.ItemIsUserCheckable flags.

I , , QSortFilterProxyModel , , , , PyQt (self.booleanSet self.readOnlySet).

def flags(self, index):
    if not index.isValid():
        return Qt.ItemIsEnabled

    if index.column() in self.booleanSet:
        return Qt.ItemIsUserCheckable | Qt.ItemIsSelectable | Qt.ItemIsEnabled
    elif index.column() in self.readOnlySet:
        return Qt.ItemIsSelectable | Qt.ItemIsEnabled
    else:
        return QSortFilterProxyModel.flags(self, index)

def data(self, index, role):
    if not index.isValid():
        return QVariant()

    if index.column() in self.booleanSet and role in (Qt.CheckStateRole, Qt.DisplayRole):
        if role == Qt.CheckStateRole:
            value = QVariant(Qt.Checked) if index.data(Qt.EditRole).toBool() else QVariant(Qt.Unchecked)
            return value
        else: #if role == Qt.DisplayRole:
            return QVariant()
    else:
        return QSortFilterProxyModel.data(self, index, role)

def setData(self, index, data, role):
    if not index.isValid():
        return False

    if index.column() in self.booleanSet and role == Qt.CheckStateRole:
        value = QVariant(True) if data.toInt()[0] == Qt.Checked else QVariant(False)
        return QSortFilterProxyModel.setData(self, index, value, Qt.EditRole)
    else:
        return QSortFilterProxyModel.setData(self, index, data, role)
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Combobox, checkBoxes , , State, checkBox ( , )

item.setFlags(QtCore.Qt.ItemIsUserCheckable | QtCore.Qt.ItemIsEnabled)
item.setCheckState(QtCore.Qt.Unchecked)  # causes checkBox to show

:

from PyQt5 import QtGui, QtCore, QtWidgets
import sys, os

# subclass
class CheckableComboBox(QtWidgets.QComboBox):
    # once there is a checkState set, it is rendered
    # here we assume default Unchecked
    def addItem(self, item):
        super(CheckableComboBox, self).addItem(item)
        item = self.model().item(self.count()-1,0)
        item.setFlags(QtCore.Qt.ItemIsUserCheckable | QtCore.Qt.ItemIsEnabled)
        item.setCheckState(QtCore.Qt.Unchecked)

    def itemChecked(self, index):
        item = self.model().item(i,0)
        return item.checkState() == QtCore.Qt.Checked

# the basic main()
app = QtWidgets.QApplication(sys.argv)
dialog = QtWidgets.QMainWindow()
mainWidget = QtWidgets.QWidget()
dialog.setCentralWidget(mainWidget)
ComboBox = CheckableComboBox(mainWidget)
for i in range(6):
    ComboBox.addItem("Combobox Item " + str(i))

dialog.show()
sys.exit(app.exec_())
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