--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/statemachine/trafficlight/main.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,185 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+//! [0]
+class LightWidget : public QWidget
+{
+    Q_OBJECT
+    Q_PROPERTY(bool on READ isOn WRITE setOn)
+public:
+    LightWidget(const QColor &color, QWidget *parent = 0)
+        : QWidget(parent), m_color(color), m_on(false) {}
+
+    bool isOn() const
+        { return m_on; }
+    void setOn(bool on)
+    {
+        if (on == m_on)
+            return;
+        m_on = on;
+        update();
+    }
+
+public slots:
+    void turnOff() { setOn(false); }
+    void turnOn() { setOn(true); }
+
+protected:
+    virtual void paintEvent(QPaintEvent *)
+    {
+        if (!m_on)
+            return;
+        QPainter painter(this);
+        painter.setRenderHint(QPainter::Antialiasing);
+        painter.setBrush(m_color);
+        painter.drawEllipse(0, 0, width(), height());
+    }
+
+private:
+    QColor m_color;
+    bool m_on;
+};
+//! [0]
+
+//! [1]
+class TrafficLightWidget : public QWidget
+{
+public:
+    TrafficLightWidget(QWidget *parent = 0)
+        : QWidget(parent)
+    {
+        QVBoxLayout *vbox = new QVBoxLayout(this);
+        m_red = new LightWidget(Qt::red);
+        vbox->addWidget(m_red);
+        m_yellow = new LightWidget(Qt::yellow);
+        vbox->addWidget(m_yellow);
+        m_green = new LightWidget(Qt::green);
+        vbox->addWidget(m_green);
+        QPalette pal = palette();
+        pal.setColor(QPalette::Background, Qt::black);
+        setPalette(pal);
+        setAutoFillBackground(true);
+    }
+
+    LightWidget *redLight() const
+        { return m_red; }
+    LightWidget *yellowLight() const
+        { return m_yellow; }
+    LightWidget *greenLight() const
+        { return m_green; }
+
+private:
+    LightWidget *m_red;
+    LightWidget *m_yellow;
+    LightWidget *m_green;
+};
+//! [1]
+
+//! [2]
+QState *createLightState(LightWidget *light, int duration, QState *parent = 0)
+{
+    QState *lightState = new QState(parent);
+    QTimer *timer = new QTimer(lightState);
+    timer->setInterval(duration);
+    timer->setSingleShot(true);
+    QState *timing = new QState(lightState);
+    QObject::connect(timing, SIGNAL(entered()), light, SLOT(turnOn()));
+    QObject::connect(timing, SIGNAL(entered()), timer, SLOT(start()));
+    QObject::connect(timing, SIGNAL(exited()), light, SLOT(turnOff()));
+    QFinalState *done = new QFinalState(lightState);
+    timing->addTransition(timer, SIGNAL(timeout()), done);
+    lightState->setInitialState(timing);
+    return lightState;
+}
+//! [2]
+
+//! [3]
+class TrafficLight : public QWidget
+{
+public:
+    TrafficLight(QWidget *parent = 0)
+        : QWidget(parent)
+    {
+        QVBoxLayout *vbox = new QVBoxLayout(this);
+        TrafficLightWidget *widget = new TrafficLightWidget();
+        vbox->addWidget(widget);
+        vbox->setMargin(0);
+
+        QStateMachine *machine = new QStateMachine(this);
+        QState *redGoingYellow = createLightState(widget->redLight(), 3000);
+        redGoingYellow->setObjectName("redGoingYellow");
+        QState *yellowGoingGreen = createLightState(widget->yellowLight(), 1000);
+        yellowGoingGreen->setObjectName("yellowGoingGreen");
+        redGoingYellow->addTransition(redGoingYellow, SIGNAL(finished()), yellowGoingGreen);
+        QState *greenGoingYellow = createLightState(widget->greenLight(), 3000);
+        greenGoingYellow->setObjectName("greenGoingYellow");
+        yellowGoingGreen->addTransition(yellowGoingGreen, SIGNAL(finished()), greenGoingYellow);
+        QState *yellowGoingRed = createLightState(widget->yellowLight(), 1000);
+        yellowGoingRed->setObjectName("yellowGoingRed");
+        greenGoingYellow->addTransition(greenGoingYellow, SIGNAL(finished()), yellowGoingRed);
+        yellowGoingRed->addTransition(yellowGoingRed, SIGNAL(finished()), redGoingYellow);
+
+        machine->addState(redGoingYellow);
+        machine->addState(yellowGoingGreen);
+        machine->addState(greenGoingYellow);
+        machine->addState(yellowGoingRed);
+        machine->setInitialState(redGoingYellow);
+        machine->start();
+    }
+};
+//! [3]
+
+//! [4]
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+
+    TrafficLight widget;
+    widget.resize(110, 300);
+    widget.show();
+
+    return app.exec();
+}
+//! [4]
+
+#include "main.moc"