<?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>plugin.cpp Example File | Qt QML 5.9</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 5.9</td><td ><a href="qtqml-index.html">Qt QML</a></td><td ><a href="qtqml-qmlextensionplugins-example.html">QML Plugin Example</a></td><td >plugin.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</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">plugin.cpp Example File</h1> <span class="subtitle">qmlextensionplugins/plugin.cpp</span> <!-- $$$qmlextensionplugins/plugin.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2017 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples 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 <QtQml/QQmlExtensionPlugin></span> <span class="preprocessor">#include <QtQml/qqml.h></span> <span class="preprocessor">#include <qdebug.h></span> <span class="preprocessor">#include <qdatetime.h></span> <span class="preprocessor">#include <qbasictimer.h></span> <span class="preprocessor">#include <qcoreapplication.h></span> <span class="comment">// Implements a "TimeModel" class with hour and minute properties</span> <span class="comment">// that change on-the-minute yet efficiently sleep the rest</span> <span class="comment">// of the time.</span> <span class="keyword">class</span> MinuteTimer : <span class="keyword">public</span> <span class="type">QObject</span> { Q_OBJECT <span class="keyword">public</span>: MinuteTimer(<span class="type">QObject</span> <span class="operator">*</span>parent) : <span class="type">QObject</span>(parent) { } <span class="type">void</span> start() { <span class="keyword">if</span> (<span class="operator">!</span>timer<span class="operator">.</span>isActive()) { time <span class="operator">=</span> <span class="type">QTime</span><span class="operator">::</span>currentTime(); timer<span class="operator">.</span>start(<span class="number">60000</span><span class="operator">-</span>time<span class="operator">.</span>second()<span class="operator">*</span><span class="number">1000</span><span class="operator">,</span> <span class="keyword">this</span>); } } <span class="type">void</span> stop() { timer<span class="operator">.</span>stop(); } <span class="type">int</span> hour() <span class="keyword">const</span> { <span class="keyword">return</span> time<span class="operator">.</span>hour(); } <span class="type">int</span> minute() <span class="keyword">const</span> { <span class="keyword">return</span> time<span class="operator">.</span>minute(); } <span class="keyword">signals</span>: <span class="type">void</span> timeChanged(); <span class="keyword">protected</span>: <span class="type">void</span> timerEvent(<span class="type">QTimerEvent</span> <span class="operator">*</span>) { <span class="type">QTime</span> now <span class="operator">=</span> <span class="type">QTime</span><span class="operator">::</span>currentTime(); <span class="keyword">if</span> (now<span class="operator">.</span>second() <span class="operator">=</span><span class="operator">=</span> <span class="number">59</span> <span class="operator">&</span><span class="operator">&</span> now<span class="operator">.</span>minute() <span class="operator">=</span><span class="operator">=</span> time<span class="operator">.</span>minute() <span class="operator">&</span><span class="operator">&</span> now<span class="operator">.</span>hour() <span class="operator">=</span><span class="operator">=</span> time<span class="operator">.</span>hour()) { <span class="comment">// just missed time tick over, force it, wait extra 0.5 seconds</span> time <span class="operator">=</span> time<span class="operator">.</span>addSecs(<span class="number">60</span>); timer<span class="operator">.</span>start(<span class="number">60500</span><span class="operator">,</span> <span class="keyword">this</span>); } <span class="keyword">else</span> { time <span class="operator">=</span> now; timer<span class="operator">.</span>start(<span class="number">60000</span><span class="operator">-</span>time<span class="operator">.</span>second()<span class="operator">*</span><span class="number">1000</span><span class="operator">,</span> <span class="keyword">this</span>); } <span class="keyword">emit</span> timeChanged(); } <span class="keyword">private</span>: <span class="type">QTime</span> time; <span class="type">QBasicTimer</span> timer; }; <span class="keyword">class</span> TimeModel : <span class="keyword">public</span> <span class="type">QObject</span> { Q_OBJECT Q_PROPERTY(<span class="type">int</span> hour READ hour NOTIFY timeChanged) Q_PROPERTY(<span class="type">int</span> minute READ minute NOTIFY timeChanged) <span class="keyword">public</span>: TimeModel(<span class="type">QObject</span> <span class="operator">*</span>parent<span class="operator">=</span><span class="number">0</span>) : <span class="type">QObject</span>(parent) { <span class="keyword">if</span> (<span class="operator">+</span><span class="operator">+</span>instances <span class="operator">=</span><span class="operator">=</span> <span class="number">1</span>) { <span class="keyword">if</span> (<span class="operator">!</span>timer) timer <span class="operator">=</span> <span class="keyword">new</span> MinuteTimer(<span class="type">QCoreApplication</span><span class="operator">::</span>instance()); connect(timer<span class="operator">,</span> <span class="operator">&</span>MinuteTimer<span class="operator">::</span>timeChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>TimeModel<span class="operator">::</span>timeChanged); timer<span class="operator">-</span><span class="operator">></span>start(); } } <span class="operator">~</span>TimeModel() { <span class="keyword">if</span> (<span class="operator">-</span><span class="operator">-</span>instances <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) { timer<span class="operator">-</span><span class="operator">></span>stop(); } } <span class="type">int</span> minute() <span class="keyword">const</span> { <span class="keyword">return</span> timer<span class="operator">-</span><span class="operator">></span>minute(); } <span class="type">int</span> hour() <span class="keyword">const</span> { <span class="keyword">return</span> timer<span class="operator">-</span><span class="operator">></span>hour(); } <span class="keyword">signals</span>: <span class="type">void</span> timeChanged(); <span class="keyword">private</span>: <span class="type">QTime</span> t; <span class="keyword">static</span> MinuteTimer <span class="operator">*</span>timer; <span class="keyword">static</span> <span class="type">int</span> instances; }; <span class="type">int</span> TimeModel<span class="operator">::</span>instances<span class="operator">=</span><span class="number">0</span>; MinuteTimer <span class="operator">*</span>TimeModel<span class="operator">::</span>timer<span class="operator">=</span><span class="number">0</span>; <span class="keyword">class</span> <span class="type">QExampleQmlPlugin</span> : <span class="keyword">public</span> <span class="type"><a href="qqmlextensionplugin.html">QQmlExtensionPlugin</a></span> { Q_OBJECT Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid) <span class="keyword">public</span>: <span class="type">void</span> registerTypes(<span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>uri) { Q_ASSERT(uri <span class="operator">=</span><span class="operator">=</span> QLatin1String(<span class="string">"TimeExample"</span>)); qmlRegisterType<span class="operator"><</span>TimeModel<span class="operator">></span>(uri<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="string">"Time"</span>); } }; <span class="preprocessor">#include "plugin.moc"</span> </pre> </div> <!-- @@@qmlextensionplugins/plugin.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 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>