/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtCore module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#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]