011aeb131e
It's a good practice to use override without virtual: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Rh-override Change-Id: I5c2d73600e6c706424589c0487133c03a4ef3629 Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
195 lines
6.5 KiB
C++
195 lines
6.5 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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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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** $QT_BEGIN_LICENSE:BSD$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtWidgets>
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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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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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public slots:
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void turnOff() { setOn(false); }
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void turnOn() { setOn(true); }
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protected:
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void paintEvent(QPaintEvent *) override
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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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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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//! [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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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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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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//! [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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//! [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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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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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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//! [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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TrafficLight widget;
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widget.resize(110, 300);
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widget.show();
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return app.exec();
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}
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//! [4]
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#include "main.moc"
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