#include <QtGui>
#include <QtWidgets>

struct Command : public QUndoCommand
{
    Command(const QString &text) : QUndoCommand(text)
    {}

    void undo()
    {
        qDebug() << "undo " + text();
    }

    void redo()
    {
        qDebug() << "redo " + text();
    }
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QUndoStack stack;
    stack.push(new Command("command 1"));
    stack.push(new Command("command 2"));
    stack.push(new Command("command 3"));

    QUndoView view(&stack);
    view.show();

    return app.exec();
}