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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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 are unsure which license is appropriate for your use, please
+** contact the sales department at http://www.qtsoftware.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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->rootState()), m_machine(machine),
+ m_stateCount(0), m_lastIndex(0)
+ { }
+
+ virtual void onEntry(QEvent *)
+ {
+ int n;
+ while ((n = (qrand() % m_stateCount + 1)) == m_lastIndex)
+ { }
+ m_lastIndex = n;
+ m_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:
+ QStateMachine *m_machine;
+ 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(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"
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