/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtCore module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include <QtGui>+
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+
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//! [0]+
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class LightWidget : public QWidget+
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{+
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    Q_OBJECT+
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    Q_PROPERTY(bool on READ isOn WRITE setOn)+
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public:+
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    LightWidget(const QColor &color, QWidget *parent = 0)+
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        : QWidget(parent), m_color(color), m_on(false) {}+
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+
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    bool isOn() const+
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        { return m_on; }+
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    void setOn(bool on)+
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    {+
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        if (on == m_on)+
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            return;+
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        m_on = on;+
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        update();+
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    }+
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+
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public slots:+
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    void turnOff() { setOn(false); }+
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    void turnOn() { setOn(true); }+
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+
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protected:+
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    virtual void paintEvent(QPaintEvent *)+
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    {+
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        if (!m_on)+
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            return;+
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        QPainter painter(this);+
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        painter.setRenderHint(QPainter::Antialiasing);+
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        painter.setBrush(m_color);+
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        painter.drawEllipse(0, 0, width(), height());+
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    }+
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+
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private:+
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    QColor m_color;+
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    bool m_on;+
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};+
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//! [0]+
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+
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//! [1]+
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class TrafficLightWidget : public QWidget+
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{+
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public:+
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    TrafficLightWidget(QWidget *parent = 0)+
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        : QWidget(parent)+
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    {+
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        QVBoxLayout *vbox = new QVBoxLayout(this);+
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        m_red = new LightWidget(Qt::red);+
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        vbox->addWidget(m_red);+
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        m_yellow = new LightWidget(Qt::yellow);+
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        vbox->addWidget(m_yellow);+
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        m_green = new LightWidget(Qt::green);+
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        vbox->addWidget(m_green);+
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        QPalette pal = palette();+
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        pal.setColor(QPalette::Background, Qt::black);+
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        setPalette(pal);+
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        setAutoFillBackground(true);+
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    }+
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+
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    LightWidget *redLight() const+
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        { return m_red; }+
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    LightWidget *yellowLight() const+
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        { return m_yellow; }+
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    LightWidget *greenLight() const+
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        { return m_green; }+
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+
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private:+
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    LightWidget *m_red;+
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    LightWidget *m_yellow;+
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    LightWidget *m_green;+
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};+
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//! [1]+
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+
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//! [2]+
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QState *createLightState(LightWidget *light, int duration, QState *parent = 0)+
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{+
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    QState *lightState = new QState(parent);+
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    QTimer *timer = new QTimer(lightState);+
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    timer->setInterval(duration);+
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    timer->setSingleShot(true);+
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    QState *timing = new QState(lightState);+
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    QObject::connect(timing, SIGNAL(entered()), light, SLOT(turnOn()));+
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    QObject::connect(timing, SIGNAL(entered()), timer, SLOT(start()));+
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    QObject::connect(timing, SIGNAL(exited()), light, SLOT(turnOff()));+
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    QFinalState *done = new QFinalState(lightState);+
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    timing->addTransition(timer, SIGNAL(timeout()), done);+
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    lightState->setInitialState(timing);+
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    return lightState;+
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}+
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//! [2]+
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+
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//! [3]+
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class TrafficLight : public QWidget+
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{+
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public:+
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    TrafficLight(QWidget *parent = 0)+
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        : QWidget(parent)+
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    {+
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        QVBoxLayout *vbox = new QVBoxLayout(this);+
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        TrafficLightWidget *widget = new TrafficLightWidget();+
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        vbox->addWidget(widget);+
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        vbox->setMargin(0);+
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+
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        QStateMachine *machine = new QStateMachine(this);+
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        QState *redGoingYellow = createLightState(widget->redLight(), 3000);+
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        redGoingYellow->setObjectName("redGoingYellow");+
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        QState *yellowGoingGreen = createLightState(widget->yellowLight(), 1000);+
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        yellowGoingGreen->setObjectName("yellowGoingGreen");+
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        redGoingYellow->addTransition(redGoingYellow, SIGNAL(finished()), yellowGoingGreen);+
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        QState *greenGoingYellow = createLightState(widget->greenLight(), 3000);+
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        greenGoingYellow->setObjectName("greenGoingYellow");+
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        yellowGoingGreen->addTransition(yellowGoingGreen, SIGNAL(finished()), greenGoingYellow);+
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        QState *yellowGoingRed = createLightState(widget->yellowLight(), 1000);+
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        yellowGoingRed->setObjectName("yellowGoingRed");+
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        greenGoingYellow->addTransition(greenGoingYellow, SIGNAL(finished()), yellowGoingRed);+
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        yellowGoingRed->addTransition(yellowGoingRed, SIGNAL(finished()), redGoingYellow);+
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+
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        machine->addState(redGoingYellow);+
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        machine->addState(yellowGoingGreen);+
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        machine->addState(greenGoingYellow);+
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        machine->addState(yellowGoingRed);+
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        machine->setInitialState(redGoingYellow);+
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        machine->start();+
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    }+
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};+
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//! [3]+
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+
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//! [4]+
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int main(int argc, char **argv)+
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{+
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    QApplication app(argc, argv);+
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+
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    TrafficLight widget;+
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    widget.resize(110, 300);+
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    widget.show();+
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+
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    return app.exec();+
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}+
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//! [4]+
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+
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#include "main.moc"+
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