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# main.cpp Example File
animation/moveblocks/main.cpp

     /****************************************************************************
     **
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     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the QtCore module of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
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     ** 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.
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     ** 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.
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     #include <QtCore>
     #include <QtGui>

     class StateSwitchEvent: public QEvent
     {
     public:
         StateSwitchEvent()
             : QEvent(Type(StateSwitchType))
         {
         }

         StateSwitchEvent(int rand)
             : QEvent(Type(StateSwitchType)),
               m_rand(rand)
         {
         }

         enum { StateSwitchType = QEvent::User + 256 };

         int rand() const { return m_rand; }

     private:
         int m_rand;
     };

     class QGraphicsRectWidget : public QGraphicsWidget
     {
     public:
         void paint(QPainter *painter, const QStyleOptionGraphicsItem *,
                    QWidget *)
         {
             painter->fillRect(rect(), Qt::blue);
         }
     };

     class StateSwitchTransition: public QAbstractTransition
     {
     public:
         StateSwitchTransition(int rand)
             : QAbstractTransition(),
               m_rand(rand)
         {
         }

     protected:
         virtual bool eventTest(QEvent *event)
         {
             return (event->type() == QEvent::Type(StateSwitchEvent::StateSwitchType))
                 && (static_cast<StateSwitchEvent *>(event)->rand() == m_rand);
         }

         virtual void onTransition(QEvent *) {}

     private:
         int m_rand;
     };

     class StateSwitcher : public QState
     {
         Q_OBJECT
     public:
         StateSwitcher(QStateMachine *machine)
             : QState(machine), m_stateCount(0), m_lastIndex(0)
         { }

         virtual void onEntry(QEvent *)
         {
             int n;
             while ((n = (qrand() % m_stateCount + 1)) == m_lastIndex)
             { }
             m_lastIndex = n;
             machine()->postEvent(new StateSwitchEvent(n));
         }
         virtual void onExit(QEvent *) {}

         void addState(QState *state, QAbstractAnimation *animation) {
             StateSwitchTransition *trans = new StateSwitchTransition(++m_stateCount);
             trans->setTargetState(state);
             addTransition(trans);
             trans->addAnimation(animation);
         }

     private:
         int m_stateCount;
         int m_lastIndex;
     };

     QState *createGeometryState(QObject *w1, const QRect &rect1,
                                 QObject *w2, const QRect &rect2,
                                 QObject *w3, const QRect &rect3,
                                 QObject *w4, const QRect &rect4,
                                 QState *parent)
     {
         QState *result = new QState(parent);
         result->assignProperty(w1, "geometry", rect1);
         result->assignProperty(w2, "geometry", rect2);
         result->assignProperty(w3, "geometry", rect3);
         result->assignProperty(w4, "geometry", rect4);

         return result;
     }

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

     #if 0
         QWidget window;
         QPalette palette;
         palette.setBrush(QPalette::Window, Qt::black);
         window.setPalette(palette);
         QPushButton *button1 = new QPushButton("A", &window);
         QPushButton *button2 = new QPushButton("B", &window);
         QPushButton *button3 = new QPushButton("C", &window);
         QPushButton *button4 = new QPushButton("D", &window);

         button1->setObjectName("button1");
         button2->setObjectName("button2");
         button3->setObjectName("button3");
         button4->setObjectName("button4");
     #else
         QGraphicsRectWidget *button1 = new QGraphicsRectWidget;
         QGraphicsRectWidget *button2 = new QGraphicsRectWidget;
         QGraphicsRectWidget *button3 = new QGraphicsRectWidget;
         QGraphicsRectWidget *button4 = new QGraphicsRectWidget;
         button2->setZValue(1);
         button3->setZValue(2);
         button4->setZValue(3);
         QGraphicsScene scene(0, 0, 300, 300);
         scene.setBackgroundBrush(Qt::black);
         scene.addItem(button1);
         scene.addItem(button2);
         scene.addItem(button3);
         scene.addItem(button4);
         QGraphicsView window(&scene);
         window.setFrameStyle(0);
         window.setAlignment(Qt::AlignLeft | Qt::AlignTop);
         window.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
         window.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
     #endif
         QStateMachine machine;

         QState *group = new QState();
         group->setObjectName("group");
         QTimer timer;
         timer.setInterval(1250);
         timer.setSingleShot(true);
         QObject::connect(group, SIGNAL(entered()), &timer, SLOT(start()));

         QState *state1;
         QState *state2;
         QState *state3;
         QState *state4;
         QState *state5;
         QState *state6;
         QState *state7;

         state1 = createGeometryState(button1, QRect(100, 0, 50, 50),
                                      button2, QRect(150, 0, 50, 50),
                                      button3, QRect(200, 0, 50, 50),
                                      button4, QRect(250, 0, 50, 50),
                                      group);
         state2 = createGeometryState(button1, QRect(250, 100, 50, 50),
                                      button2, QRect(250, 150, 50, 50),
                                      button3, QRect(250, 200, 50, 50),
                                      button4, QRect(250, 250, 50, 50),
                                      group);
         state3 = createGeometryState(button1, QRect(150, 250, 50, 50),
                                      button2, QRect(100, 250, 50, 50),
                                      button3, QRect(50, 250, 50, 50),
                                      button4, QRect(0, 250, 50, 50),
                                      group);
         state4 = createGeometryState(button1, QRect(0, 150, 50, 50),
                                      button2, QRect(0, 100, 50, 50),
                                      button3, QRect(0, 50, 50, 50),
                                      button4, QRect(0, 0, 50, 50),
                                      group);
         state5 = createGeometryState(button1, QRect(100, 100, 50, 50),
                                      button2, QRect(150, 100, 50, 50),
                                      button3, QRect(100, 150, 50, 50),
                                      button4, QRect(150, 150, 50, 50),
                                      group);
         state6 = createGeometryState(button1, QRect(50, 50, 50, 50),
                                      button2, QRect(200, 50, 50, 50),
                                      button3, QRect(50, 200, 50, 50),
                                      button4, QRect(200, 200, 50, 50),
                                      group);
         state7 = createGeometryState(button1, QRect(0, 0, 50, 50),
                                      button2, QRect(250, 0, 50, 50),
                                      button3, QRect(0, 250, 50, 50),
                                      button4, QRect(250, 250, 50, 50),
                                      group);
         group->setInitialState(state1);

         QParallelAnimationGroup animationGroup;
         QSequentialAnimationGroup *subGroup;

         QPropertyAnimation *anim = new QPropertyAnimation(button4, "geometry");
         anim->setDuration(1000);
         anim->setEasingCurve(QEasingCurve::OutElastic);
         animationGroup.addAnimation(anim);

         subGroup = new QSequentialAnimationGroup(&animationGroup);
         subGroup->addPause(100);
         anim = new QPropertyAnimation(button3, "geometry");
         anim->setDuration(1000);
         anim->setEasingCurve(QEasingCurve::OutElastic);
         subGroup->addAnimation(anim);

         subGroup = new QSequentialAnimationGroup(&animationGroup);
         subGroup->addPause(150);
         anim = new QPropertyAnimation(button2, "geometry");
         anim->setDuration(1000);
         anim->setEasingCurve(QEasingCurve::OutElastic);
         subGroup->addAnimation(anim);

         subGroup = new QSequentialAnimationGroup(&animationGroup);
         subGroup->addPause(200);
         anim = new QPropertyAnimation(button1, "geometry");
         anim->setDuration(1000);
         anim->setEasingCurve(QEasingCurve::OutElastic);
         subGroup->addAnimation(anim);

         StateSwitcher *stateSwitcher = new StateSwitcher(&machine);
         stateSwitcher->setObjectName("stateSwitcher");
         group->addTransition(&timer, SIGNAL(timeout()), stateSwitcher);
         stateSwitcher->addState(state1, &animationGroup);
         stateSwitcher->addState(state2, &animationGroup);
         stateSwitcher->addState(state3, &animationGroup);
         stateSwitcher->addState(state4, &animationGroup);
         stateSwitcher->addState(state5, &animationGroup);
         stateSwitcher->addState(state6, &animationGroup);
         stateSwitcher->addState(state7, &animationGroup);

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

         window.resize(300, 300);
         window.show();

         qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));

         return app.exec();
     }

     #include "main.moc"