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<h1 class="title">plugin.cpp Example File</h1>
<span class="small-subtitle">qmlextensionplugins/plugin.cpp</span>
<!-- $$$qmlextensionplugins/plugin.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"><span class="comment">/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 Digia Plc and its Subsidiary(-ies) 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>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> SIGNAL(timeChanged())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SIGNAL(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 <span class="string">"org.qt-project.Qt.QQmlExtensionInterface"</span>)
<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>
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<!-- @@@qmlextensionplugins/plugin.cpp -->
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<acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its
subsidiaries. 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> Digia, Qt and their respective logos are trademarks of Digia Plc in Finland and/or other countries worldwide. All other trademarks are property
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