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#include <QtCore>

#include <stdio.h>

//! [0]

class PingEvent : public QEvent

{

public:

    PingEvent() : QEvent(QEvent::Type(QEvent::User+2))

        {}

};

class PongEvent : public QEvent

{

public:

    PongEvent() : QEvent(QEvent::Type(QEvent::User+3))

        {}

};

//! [0]

//! [1]

class Pinger : public QState

{

public:

    Pinger(QState *parent)

        : QState(parent) {}

protected:

    virtual void onEntry(QEvent *)

    {

        machine()->postEvent(new PingEvent());

        fprintf(stdout, "ping?\n");

    }

};

//! [1]

//! [3]

class PongTransition : public QAbstractTransition

{

public:

    PongTransition() {}

protected:

    virtual bool eventTest(QEvent *e) {

        return (e->type() == QEvent::User+3);

    }

    virtual void onTransition(QEvent *)

    {

        machine()->postDelayedEvent(new PingEvent(), 500);

        fprintf(stdout, "ping?\n");

    }

};

//! [3]

//! [2]

class PingTransition : public QAbstractTransition

{

public:

    PingTransition() {}

protected:

    virtual bool eventTest(QEvent *e) {

        return (e->type() == QEvent::User+2);

    }

    virtual void onTransition(QEvent *)

    {

        machine()->postDelayedEvent(new PongEvent(), 500);

        fprintf(stdout, "pong!\n");

    }

};

//! [2]

//! [4]

int main(int argc, char **argv)

{

    QCoreApplication app(argc, argv);

    QStateMachine machine;

    QState *group = new QState(QState::ParallelStates);

    group->setObjectName("group");

//! [4]

//! [5]

    Pinger *pinger = new Pinger(group);

    pinger->setObjectName("pinger");

    pinger->addTransition(new PongTransition());

    QState *ponger = new QState(group);

    ponger->setObjectName("ponger");

    ponger->addTransition(new PingTransition());

//! [5]

//! [6]

    machine.addState(group);

    machine.setInitialState(group);

    machine.start();

    return app.exec();

}

//! [6]