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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the $MODULE$ of the Qt Toolkit.
**
** $TROLLTECH_DUAL_LICENSE$
**
****************************************************************************/
#include <QtGui>
#ifdef QT_STATEMACHINE_SOLUTION
#include <qstate.h>
#include <qstatemachine.h>
#include <qfinalstate.h>
#endif
//! [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();
}
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 LightState : public QState
{
public:
LightState(LightWidget *light, int duration, QState *parent = 0)
: QState(parent)
{
QTimer *timer = new QTimer(this);
timer->setInterval(duration);
timer->setSingleShot(true);
QState *timing = new QState(this);
timing->setPropertyOnEntry(light, "on", true);
timing->invokeMethodOnEntry(timer, "start");
timing->setPropertyOnExit(light, "on", false);
QFinalState *done = new QFinalState(this);
timing->addTransition(timer, SIGNAL(timeout()), done);
setInitialState(timing);
}
};
//! [1]
//! [2]
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;
};
//! [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);
QStateMachine *machine = new QStateMachine(this);
LightState *redGoingYellow = new LightState(widget->redLight(), 3000);
redGoingYellow->setObjectName("redGoingYellow");
LightState *yellowGoingGreen = new LightState(widget->yellowLight(), 1000);
yellowGoingGreen->setObjectName("yellowGoingGreen");
redGoingYellow->addFinishedTransition(yellowGoingGreen);
LightState *greenGoingYellow = new LightState(widget->greenLight(), 3000);
greenGoingYellow->setObjectName("greenGoingYellow");
yellowGoingGreen->addFinishedTransition(greenGoingYellow);
LightState *yellowGoingRed = new LightState(widget->yellowLight(), 1000);
yellowGoingRed->setObjectName("yellowGoingRed");
greenGoingYellow->addFinishedTransition(yellowGoingRed);
yellowGoingRed->addFinishedTransition(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(120, 300);
widget.show();
return app.exec();
}
//! [4]
#include "main.moc"
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