<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>main.cpp Example File | Qt Widgets 5.12.6</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-statemachine-trafficlight-example.html">Traffic Light Example</a></td><td >main.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtwidgets-index.html">Qt 5.12.6 Reference Documentation</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">main.cpp Example File</h1> <span class="subtitle">statemachine/trafficlight/main.cpp</span> <!-- $$$statemachine/trafficlight/main.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the QtCore module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, you may use this file under the terms of the BSD license ** as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of The Qt Company Ltd nor the names of its ** contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include <QtWidgets></span> <span class="keyword">class</span> LightWidget : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span> { Q_OBJECT Q_PROPERTY(bool on READ isOn WRITE setOn) <span class="keyword">public</span>: LightWidget(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> <span class="operator">&</span>color<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>) : <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)<span class="operator">,</span> m_color(color)<span class="operator">,</span> m_on(<span class="keyword">false</span>) {} bool isOn() <span class="keyword">const</span> { <span class="keyword">return</span> m_on; } <span class="type">void</span> setOn(bool on) { <span class="keyword">if</span> (on <span class="operator">=</span><span class="operator">=</span> m_on) <span class="keyword">return</span>; m_on <span class="operator">=</span> on; update(); } <span class="keyword">public</span> <span class="keyword">slots</span>: <span class="type">void</span> turnOff() { setOn(<span class="keyword">false</span>); } <span class="type">void</span> turnOn() { setOn(<span class="keyword">true</span>); } <span class="keyword">protected</span>: <span class="type">void</span> paintEvent(<span class="type"><a href="../qtgui/qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>) override { <span class="keyword">if</span> (<span class="operator">!</span>m_on) <span class="keyword">return</span>; <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>); painter<span class="operator">.</span>setRenderHint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing); painter<span class="operator">.</span>setBrush(m_color); painter<span class="operator">.</span>drawEllipse(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> width()<span class="operator">,</span> height()); } <span class="keyword">private</span>: <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> m_color; bool m_on; }; <span class="keyword">class</span> TrafficLightWidget : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span> { <span class="keyword">public</span>: TrafficLightWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>) : <span class="type"><a href="qwidget.html">QWidget</a></span>(parent) { <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>vbox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>(<span class="keyword">this</span>); m_red <span class="operator">=</span> <span class="keyword">new</span> LightWidget(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>red); vbox<span class="operator">-</span><span class="operator">></span>addWidget(m_red); m_yellow <span class="operator">=</span> <span class="keyword">new</span> LightWidget(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>yellow); vbox<span class="operator">-</span><span class="operator">></span>addWidget(m_yellow); m_green <span class="operator">=</span> <span class="keyword">new</span> LightWidget(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>green); vbox<span class="operator">-</span><span class="operator">></span>addWidget(m_green); <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span> pal <span class="operator">=</span> palette(); pal<span class="operator">.</span>setColor(<span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Background<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black); setPalette(pal); setAutoFillBackground(<span class="keyword">true</span>); } LightWidget <span class="operator">*</span>redLight() <span class="keyword">const</span> { <span class="keyword">return</span> m_red; } LightWidget <span class="operator">*</span>yellowLight() <span class="keyword">const</span> { <span class="keyword">return</span> m_yellow; } LightWidget <span class="operator">*</span>greenLight() <span class="keyword">const</span> { <span class="keyword">return</span> m_green; } <span class="keyword">private</span>: LightWidget <span class="operator">*</span>m_red; LightWidget <span class="operator">*</span>m_yellow; LightWidget <span class="operator">*</span>m_green; }; <span class="type"><a href="../qtcore/qstate.html">QState</a></span> <span class="operator">*</span>createLightState(LightWidget <span class="operator">*</span>light<span class="operator">,</span> <span class="type">int</span> duration<span class="operator">,</span> <span class="type"><a href="../qtcore/qstate.html">QState</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>) { <span class="type"><a href="../qtcore/qstate.html">QState</a></span> <span class="operator">*</span>lightState <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qstate.html">QState</a></span>(parent); <span class="type"><a href="../qtcore/qtimer.html">QTimer</a></span> <span class="operator">*</span>timer <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qtimer.html">QTimer</a></span>(lightState); timer<span class="operator">-</span><span class="operator">></span>setInterval(duration); timer<span class="operator">-</span><span class="operator">></span>setSingleShot(<span class="keyword">true</span>); <span class="type"><a href="../qtcore/qstate.html">QState</a></span> <span class="operator">*</span>timing <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qstate.html">QState</a></span>(lightState); <span class="type"><a href="../qtcore/qobject.html">QObject</a></span><span class="operator">::</span>connect(timing<span class="operator">,</span> SIGNAL(entered())<span class="operator">,</span> light<span class="operator">,</span> SLOT(turnOn())); <span class="type"><a href="../qtcore/qobject.html">QObject</a></span><span class="operator">::</span>connect(timing<span class="operator">,</span> SIGNAL(entered())<span class="operator">,</span> timer<span class="operator">,</span> SLOT(start())); <span class="type"><a href="../qtcore/qobject.html">QObject</a></span><span class="operator">::</span>connect(timing<span class="operator">,</span> SIGNAL(exited())<span class="operator">,</span> light<span class="operator">,</span> SLOT(turnOff())); <span class="type"><a href="../qtcore/qfinalstate.html">QFinalState</a></span> <span class="operator">*</span>done <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qfinalstate.html">QFinalState</a></span>(lightState); timing<span class="operator">-</span><span class="operator">></span>addTransition(timer<span class="operator">,</span> SIGNAL(timeout())<span class="operator">,</span> done); lightState<span class="operator">-</span><span class="operator">></span>setInitialState(timing); <span class="keyword">return</span> lightState; } <span class="keyword">class</span> TrafficLight : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span> { <span class="keyword">public</span>: TrafficLight(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>) : <span class="type"><a href="qwidget.html">QWidget</a></span>(parent) { <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>vbox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>(<span class="keyword">this</span>); TrafficLightWidget <span class="operator">*</span>widget <span class="operator">=</span> <span class="keyword">new</span> TrafficLightWidget(); vbox<span class="operator">-</span><span class="operator">></span>addWidget(widget); vbox<span class="operator">-</span><span class="operator">></span>setMargin(<span class="number">0</span>); <span class="type"><a href="../qtcore/qstatemachine.html">QStateMachine</a></span> <span class="operator">*</span>machine <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qstatemachine.html">QStateMachine</a></span>(<span class="keyword">this</span>); <span class="type"><a href="../qtcore/qstate.html">QState</a></span> <span class="operator">*</span>redGoingYellow <span class="operator">=</span> createLightState(widget<span class="operator">-</span><span class="operator">></span>redLight()<span class="operator">,</span> <span class="number">3000</span>); redGoingYellow<span class="operator">-</span><span class="operator">></span>setObjectName(<span class="string">"redGoingYellow"</span>); <span class="type"><a href="../qtcore/qstate.html">QState</a></span> <span class="operator">*</span>yellowGoingGreen <span class="operator">=</span> createLightState(widget<span class="operator">-</span><span class="operator">></span>yellowLight()<span class="operator">,</span> <span class="number">1000</span>); yellowGoingGreen<span class="operator">-</span><span class="operator">></span>setObjectName(<span class="string">"yellowGoingGreen"</span>); redGoingYellow<span class="operator">-</span><span class="operator">></span>addTransition(redGoingYellow<span class="operator">,</span> SIGNAL(finished())<span class="operator">,</span> yellowGoingGreen); <span class="type"><a href="../qtcore/qstate.html">QState</a></span> <span class="operator">*</span>greenGoingYellow <span class="operator">=</span> createLightState(widget<span class="operator">-</span><span class="operator">></span>greenLight()<span class="operator">,</span> <span class="number">3000</span>); greenGoingYellow<span class="operator">-</span><span class="operator">></span>setObjectName(<span class="string">"greenGoingYellow"</span>); yellowGoingGreen<span class="operator">-</span><span class="operator">></span>addTransition(yellowGoingGreen<span class="operator">,</span> SIGNAL(finished())<span class="operator">,</span> greenGoingYellow); <span class="type"><a href="../qtcore/qstate.html">QState</a></span> <span class="operator">*</span>yellowGoingRed <span class="operator">=</span> createLightState(widget<span class="operator">-</span><span class="operator">></span>yellowLight()<span class="operator">,</span> <span class="number">1000</span>); yellowGoingRed<span class="operator">-</span><span class="operator">></span>setObjectName(<span class="string">"yellowGoingRed"</span>); greenGoingYellow<span class="operator">-</span><span class="operator">></span>addTransition(greenGoingYellow<span class="operator">,</span> SIGNAL(finished())<span class="operator">,</span> yellowGoingRed); yellowGoingRed<span class="operator">-</span><span class="operator">></span>addTransition(yellowGoingRed<span class="operator">,</span> SIGNAL(finished())<span class="operator">,</span> redGoingYellow); machine<span class="operator">-</span><span class="operator">></span>addState(redGoingYellow); machine<span class="operator">-</span><span class="operator">></span>addState(yellowGoingGreen); machine<span class="operator">-</span><span class="operator">></span>addState(greenGoingYellow); machine<span class="operator">-</span><span class="operator">></span>addState(yellowGoingRed); machine<span class="operator">-</span><span class="operator">></span>setInitialState(redGoingYellow); machine<span class="operator">-</span><span class="operator">></span>start(); } }; <span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">*</span>argv) { <span class="type"><a href="qapplication.html">QApplication</a></span> app(argc<span class="operator">,</span> argv); TrafficLight widget; widget<span class="operator">.</span>resize(<span class="number">110</span><span class="operator">,</span> <span class="number">300</span>); widget<span class="operator">.</span>show(); <span class="keyword">return</span> app<span class="operator">.</span>exec(); } <span class="preprocessor">#include "main.moc"</span> </pre> </div> <!-- @@@statemachine/trafficlight/main.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>