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Source code

class SpinBoxAction : public QWidgetAction {
public:
    SpinBoxAction (const QString & title) :
      QWidgetAction (NULL) {
        QWidget* pWidget = new QWidget (NULL);
        QHBoxLayout* pLayout = new QHBoxLayout();

        pLabel = new QLabel(title);
        pPushButton = new QPushButton("+");
        pMenu = new QMenu();
        pMenu->addMenu("");

        pLayout->addWidget(pLabel);
        pLayout->addWidget(pPushButton);
        pLayout->addWidget(pMenu);

        pWidget->setLayout(pLayout);

        setDefaultWidget(pWidget);
    }

    }

private:
    QMenu *pMenu;
    QPushButton *pPushButton;
    QLabel *pLabel;
};

Source code

SpinBoxAction * spinBoxAction = new SpinBoxAction(tr("Action Title"));
    ui->menuOlolo->addAction(spinBoxAction);