如何使用Qt在菜单上创建三态操作

QMenu *menu = new QMenu(this);

QAction *action1 = new QAction("操作1", this);
action1->setIcon(QIcon(":/icons/icon1.png"));
action1->setCheckable(true);
action1->setChecked(true);

QAction *action2 = new QAction("操作2", this);
action2->setIcon(QIcon(":/icons/icon2.png"));
action2->setCheckable(true);
action2->setChecked(false);

QAction *action3 = new QAction("操作3", this);
action3->setIcon(QIcon(":/icons/icon3.png"));
action3->setCheckable(true);
action3->setChecked(false);

menu->addAction(action1);
menu->addAction(action2);
menu->addAction(action3);

connect(action1, &QAction::triggered, this, &MainWindow::handleAction1);
connect(action2, &QAction::triggered, this, &MainWindow::handleAction2);
connect(action3, &QAction::triggered, this, &MainWindow::handleAction3);

menu->exec(QCursor::pos());