int main(int argc, char **argv)

{

    QApplication app(argc, argv);

    QWidget panel;

    QVBoxLayout *l = new QVBoxLayout(&panel);

    QFrame *viewport = new QFrame;

    viewport->setFrameShape(QFrame::Box);

    viewport->setFixedSize(,);

    l->addWidget(viewport);

    QPushButton *b = new QPushButton("Swap");

    l->addWidget(b);

    QStateMachine machine;

    QState *s1 = new QState;

    QState *s2 = new QState;

    QWidget *w1 = new QCalendarWidget(viewport);

    w1->setFixedSize(,);

    QWidget *w2 = new QListView(viewport);

    w2->setFixedSize(,);

    QGraphicsBlurEffect *e1 = new QGraphicsBlurEffect(w1);

    QGraphicsBlurEffect *e2 = new QGraphicsBlurEffect(w2);

    w1->setGraphicsEffect(e1);

    w2->setGraphicsEffect(e2);

    s1->assignProperty(w1, "pos", QPoint(,));

    s1->assignProperty(w2, "pos", QPoint(,));

    s1->assignProperty(e1, "blurRadius", );

    s1->assignProperty(e2, "blurRadius", );

    s2->assignProperty(w1, "pos", QPoint(-, ));

    s2->assignProperty(w2, "pos", QPoint(,));

    s2->assignProperty(e1, "blurRadius", );

    s2->assignProperty(e2, "blurRadius", );

    s1->addTransition(b, SIGNAL(clicked()), s2);

    s2->addTransition(b, SIGNAL(clicked()), s1);

    machine.addState(s1);

    machine.addState(s2);

    QPropertyAnimation *anim1 = new QPropertyAnimation(w1, "pos");

    QPropertyAnimation *anim2 = new QPropertyAnimation(w2, "pos");

    anim1->setEasingCurve(QEasingCurve::InOutCubic);

    anim2->setEasingCurve(anim1->easingCurve());

    anim1->setDuration();

    anim2->setDuration(anim1->duration());

    machine.addDefaultAnimation(anim1);

    machine.addDefaultAnimation(anim2);

    anim1 = new QPropertyAnimation(e1, "blurRadius");

    anim2 = new QPropertyAnimation(e2, "blurRadius");

    anim1->setDuration();

    anim2->setDuration(anim1->duration());

    machine.addDefaultAnimation(anim1);

    machine.addDefaultAnimation(anim2);

    machine.setInitialState(s1);

    machine.start();

    panel.show();

    return app.exec();

}