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#include <QtStateMachine>
#include <QtWidgets>

int main(int argv, char **args)
{
    QApplication app(argv, args);

    QLabel *label = new QLabel;
    QPushButton *button = new QPushButton;

//![0]
    QStateMachine machine;
    QState *s1 = new QState();
    QState *s2 = new QState();
    QState *s3 = new QState();
//![0]

//![4]
    s1->assignProperty(label, "text", "In state s1");
    s2->assignProperty(label, "text", "In state s2");
    s3->assignProperty(label, "text", "In state s3");
//![4]

//![5]
    QObject::connect(s3, &QState::entered, button, &QPushButton:showMaximized);
    QObject::connect(s3, &QState::exited, button, &QPushButton::showMinimized);
//![5]

//![1]
    s1->addTransition(button, &QPushButton::clicked, s2);
    s2->addTransition(button, &QPushButton::clicked, s3);
    s3->addTransition(button, &QPushButton::clicked, s1);
//![1]

//![2]
    machine.addState(s1);
    machine.addState(s2);
    machine.addState(s3);
    machine.setInitialState(s1);
//![2]

//![3]
    machine.start();
//![3]

    label->show();

    return app.exec();
}
