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Diffstat (limited to 'examples/statemachine/trafficlight/main.cpp')
| -rw-r--r-- | examples/statemachine/trafficlight/main.cpp | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/examples/statemachine/trafficlight/main.cpp b/examples/statemachine/trafficlight/main.cpp new file mode 100644 index 0000000..528ed00 --- /dev/null +++ b/examples/statemachine/trafficlight/main.cpp @@ -0,0 +1,192 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (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 qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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(); + } + +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 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->invokeMethodOnEntry(light, "turnOn"); + timing->invokeMethodOnEntry(timer, "start"); + timing->invokeMethodOnExit(light, "turnOff"); + 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" |