C++ (Qt)
MainWindow::MainWindow() {
QAction * act1 = new QAction(this);
QAction * act2 = new QAction(this);
QAction * act3 = new QAction(this);
 
act1->setData(1);
act2->setData(2);
act3->setData(3);
 
QActionGroup * group = new QActionGroup(this);
group->addAction(act1); // Если сигналы из формы, то ui->act1
group->addAction(act2);
group->addAction(act3);
connect(group, SIGNAL(triggered(QAction*)), this, SLOT(my_slot(QAction*)));
}
 
void MainWindow::my_slot(QAction * a) {
    int num = a->data().toInt();
    emit m_scene->signalModeChanged(num);
}