#include <QAction>
#include <QApplication>
#include <QFont>
#include <QIcon>
#include <QMainWindow>
#include <QMenu>
#include <QMenuBar>
#include <QPainter>
#include <QPixmap>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMainWindow w;
    QMenuBar *menuBar = new QMenuBar(&w);
    w.setMenuBar(menuBar);
    QMenu *menu = new QMenu("Menu", menuBar);
    menuBar->addMenu(menu);

    QIcon icon;
    for (int i = 16; i <= 48; ++i) {
        QPixmap pixmap(i, i);
        QPainter p(&pixmap);
        p.fillRect(QRect(0, 0, i, i), Qt::black);
        QFont font = p.font();
        font.setPixelSize(i * 2 / 3);
        font.setBold(true);
        p.setFont(font);
        p.setPen(Qt::white);
        p.drawText(QRect(0, 0, i, i), QString::number(i));
        p.end();
        icon.addPixmap(pixmap);
    }

    for (int i = 1; i <= 3; ++i) {
        QAction *action = new QAction(QString("Action %1").arg(i), menu);
        action->setIcon(icon);
        menu->addAction(action);
    }

    w.show();
    return a.exec();
}