Home · All Classes · All Functions · Overviews

main.cpp Example File
statemachine/pingpong/main.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2010 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.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** Commercial Usage
 ** Licensees holding valid Qt Commercial licenses may use this file in
 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
 **
 ** 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.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License version 3.0 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.GPL included in the
 ** packaging of this file.  Please review the following information to
 ** ensure the GNU General Public License version 3.0 requirements will be
 ** met: http://www.gnu.org/copyleft/gpl.html.
 **
 ** 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>

 class PingEvent : public QEvent
 {
 public:
     PingEvent() : QEvent(QEvent::Type(QEvent::User+2))
         {}
 };

 class PongEvent : public QEvent
 {
 public:
     PongEvent() : QEvent(QEvent::Type(QEvent::User+3))
         {}
 };

 class Pinger : public QState
 {
 public:
     Pinger(QState *parent)
         : QState(parent) {}

 protected:
     virtual void onEntry(QEvent *)
     {
         machine()->postEvent(new PingEvent());
         fprintf(stdout, "ping?\n");
     }
 };

 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");
     }
 };

 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");
     }
 };

 int main(int argc, char **argv)
 {
     QCoreApplication app(argc, argv);

     QStateMachine machine;
     QState *group = new QState(QState::ParallelStates);
     group->setObjectName("group");

     Pinger *pinger = new Pinger(group);
     pinger->setObjectName("pinger");
     pinger->addTransition(new PongTransition());

     QState *ponger = new QState(group);
     ponger->setObjectName("ponger");
     ponger->addTransition(new PingTransition());

     machine.addState(group);
     machine.setInitialState(group);
     machine.start();

     return app.exec();
 }


Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies) Trademarks
Qt 4.6.3