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void MainWindow::actionEvent(QActionEvent *event)
{
    QAction *action = event->action();
    QObject *obj = sender();
    if (qobject_cast<QPushButton*>(obj)) {
      if (event->type() == QEvent::ButtonPress) {
        
        switch(event->type()) {
        case QEvent::ActionChanged:
               setChangeAction(action);
               break;
        case QEvent::ActionAdded:
            connect(action, SIGNAL(triggered()), this, SLOT(triggeredAct()));
            break;
        default:
            ;
        }
        return;
    }
}    

void MainWindow::setChangeAction(QAction *action)
{
       addAction(action);
       reg->setText(action->iconText());
       reg->setIcon(action->icon());
}

void MainWindow::triggeredAct()
{
    if(QAction *action = qobject_cast<QAction*>(reg))
       emit triggered(action);
       действие…
    }