text: /****************************************************************************
  **
  ** Copyright (C) 2015 The Qt Company Ltd.
  ** Contact: http://www.qt.io/licensing/
  **
  ** This file is part of the documentation of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** You may use this file under the terms of the BSD license as follows:
  **
  ** "Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/
  
  #include <QtGui>
  
  
  //![0]
  struct StringEvent : public QEvent
  {
      StringEvent(const QString &val)
      : QEvent(QEvent::Type(QEvent::User+1)),
        value(val) {}
  
      QString value;
  };
  //![0]
  
  //![1]
  class StringTransition : public QAbstractTransition
  {
      Q_OBJECT
  
  public:
      StringTransition(const QString &value)
          : m_value(value) {}
  
  protected:
      virtual bool eventTest(QEvent *e)
      {
          if (e->type() != QEvent::Type(QEvent::User+1)) // StringEvent
              return false;
          StringEvent *se = static_cast<StringEvent*>(e);
          return (m_value == se->value);
      }
  
      virtual void onTransition(QEvent *) {}
  
  private:
      QString m_value;
  };
  //![1]
  
  int main(int argv, char **args)
  {
      QApplication app(argv, args);
  
  //![2]
      QStateMachine machine;
      QState *s1 = new QState();
      QState *s2 = new QState();
      QFinalState *done = new QFinalState();
  
      StringTransition *t1 = new StringTransition("Hello");
      t1->setTargetState(s2);
      s1->addTransition(t1);
      StringTransition *t2 = new StringTransition("world");
      t2->setTargetState(done);
      s2->addTransition(t2);
  
      machine.addState(s1);
      machine.addState(s2);
      machine.addState(done);
      machine.setInitialState(s1);
  //![2]
  
  //![3]
      machine.postEvent(new StringEvent("Hello"));
      machine.postEvent(new StringEvent("world"));
  //![3]
  
      return app.exec();
  }
  
  #include "main4.moc"
  
  