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<h1 class="title">fluidlauncher.cpp Example File</h1>
<span class="small-subtitle">demos/embedded/fluidlauncher/fluidlauncher.cpp</span>
<!-- $$$demos/embedded/fluidlauncher/fluidlauncher.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &lt;QXmlStreamReader&gt;</span>
<span class="preprocessor">#include &quot;fluidlauncher.h&quot;</span>
<span class="preprocessor">#define DEFAULT_INPUT_TIMEOUT 10000</span>
<span class="preprocessor">#define SIZING_FACTOR_HEIGHT 6/10</span>
<span class="preprocessor">#define SIZING_FACTOR_WIDTH 6/10</span>
FluidLauncher<span class="operator">::</span>FluidLauncher(<span class="type"><a href="qstringlist.html">QStringList</a></span><span class="operator">*</span> args)
{
pictureFlowWidget <span class="operator">=</span> <span class="keyword">new</span> PictureFlow();
slideShowWidget <span class="operator">=</span> <span class="keyword">new</span> SlideShow();
inputTimer <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtimer.html">QTimer</a></span>();
addWidget(pictureFlowWidget);
addWidget(slideShowWidget);
setCurrentWidget(pictureFlowWidget);
pictureFlowWidget<span class="operator">-</span><span class="operator">&gt;</span>setFocus();
<span class="type"><a href="qrect.html">QRect</a></span> screen_size <span class="operator">=</span> <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>desktop()<span class="operator">-</span><span class="operator">&gt;</span>screenGeometry();
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(pictureFlowWidget<span class="operator">,</span> SIGNAL(itemActivated(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(launchApplication(<span class="type">int</span>)));
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(pictureFlowWidget<span class="operator">,</span> SIGNAL(inputReceived())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(resetInputTimeout()));
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(slideShowWidget<span class="operator">,</span> SIGNAL(inputReceived())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(switchToLauncher()));
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(inputTimer<span class="operator">,</span> SIGNAL(timeout())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(inputTimedout()));
inputTimer<span class="operator">-</span><span class="operator">&gt;</span>setSingleShot(<span class="keyword">true</span>);
inputTimer<span class="operator">-</span><span class="operator">&gt;</span>setInterval(DEFAULT_INPUT_TIMEOUT);
<span class="keyword">const</span> <span class="type">int</span> h <span class="operator">=</span> screen_size<span class="operator">.</span>height() <span class="operator">*</span> SIZING_FACTOR_HEIGHT;
<span class="keyword">const</span> <span class="type">int</span> w <span class="operator">=</span> screen_size<span class="operator">.</span>width() <span class="operator">*</span> SIZING_FACTOR_WIDTH;
<span class="keyword">const</span> <span class="type">int</span> hh <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a>(h<span class="operator">,</span> w);
<span class="keyword">const</span> <span class="type">int</span> ww <span class="operator">=</span> hh <span class="operator">/</span> <span class="number">3</span> <span class="operator">*</span> <span class="number">2</span>;
pictureFlowWidget<span class="operator">-</span><span class="operator">&gt;</span>setSlideSize(<span class="type"><a href="qsize.html">QSize</a></span>(ww<span class="operator">,</span> hh));
<span class="type">bool</span> success;
<span class="type">int</span> configIndex <span class="operator">=</span> args<span class="operator">-</span><span class="operator">&gt;</span>indexOf(<span class="string">&quot;-config&quot;</span>);
<span class="keyword">if</span> ( (configIndex <span class="operator">!</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) <span class="operator">&amp;</span><span class="operator">&amp;</span> (configIndex <span class="operator">!</span><span class="operator">=</span> args<span class="operator">-</span><span class="operator">&gt;</span>count()<span class="operator">-</span><span class="number">1</span>) )
success <span class="operator">=</span> loadConfig(args<span class="operator">-</span><span class="operator">&gt;</span>at(configIndex<span class="operator">+</span><span class="number">1</span>));
<span class="keyword">else</span>
success <span class="operator">=</span> loadConfig(<span class="string">&quot;config.xml&quot;</span>);
<span class="keyword">if</span> (success) {
populatePictureFlow();
showFullScreen();
inputTimer<span class="operator">-</span><span class="operator">&gt;</span>start();
} <span class="keyword">else</span> {
pictureFlowWidget<span class="operator">-</span><span class="operator">&gt;</span>setAttribute(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WA_DeleteOnClose<span class="operator">,</span> <span class="keyword">true</span>);
pictureFlowWidget<span class="operator">-</span><span class="operator">&gt;</span>close();
}
}
FluidLauncher<span class="operator">::</span><span class="operator">~</span>FluidLauncher()
{
<span class="keyword">delete</span> pictureFlowWidget;
<span class="keyword">delete</span> slideShowWidget;
}
<span class="type">bool</span> FluidLauncher<span class="operator">::</span>loadConfig(<span class="type"><a href="qstring.html">QString</a></span> configPath)
{
<span class="type"><a href="qfile.html">QFile</a></span> xmlFile(configPath);
<span class="keyword">if</span> (<span class="operator">!</span>xmlFile<span class="operator">.</span>exists() <span class="operator">|</span><span class="operator">|</span> (xmlFile<span class="operator">.</span>error() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qfile.html">QFile</a></span><span class="operator">::</span>NoError)) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;ERROR: Unable to open config file &quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> configPath;
<span class="keyword">return</span> <span class="keyword">false</span>;
}
slideShowWidget<span class="operator">-</span><span class="operator">&gt;</span>clearImages();
xmlFile<span class="operator">.</span>open(<span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly);
<span class="type"><a href="qxmlstreamreader.html">QXmlStreamReader</a></span> reader(<span class="operator">&amp;</span>xmlFile);
<span class="keyword">while</span> (<span class="operator">!</span>reader<span class="operator">.</span>atEnd()) {
reader<span class="operator">.</span>readNext();
<span class="keyword">if</span> (reader<span class="operator">.</span>isStartElement()) {
<span class="keyword">if</span> (reader<span class="operator">.</span>name() <span class="operator">=</span><span class="operator">=</span> <span class="string">&quot;demos&quot;</span>)
parseDemos(reader);
<span class="keyword">else</span> <span class="keyword">if</span>(reader<span class="operator">.</span>name() <span class="operator">=</span><span class="operator">=</span> <span class="string">&quot;slideshow&quot;</span>)
parseSlideshow(reader);
}
}
<span class="keyword">if</span> (reader<span class="operator">.</span>hasError()) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">&quot;Error parsing %1 on line %2 column %3: \n%4&quot;</span>)
<span class="operator">.</span>arg(configPath)
<span class="operator">.</span>arg(reader<span class="operator">.</span>lineNumber())
<span class="operator">.</span>arg(reader<span class="operator">.</span>columnNumber())
<span class="operator">.</span>arg(reader<span class="operator">.</span>errorString());
}
<span class="comment">// Append an exit Item</span>
DemoApplication<span class="operator">*</span> exitItem <span class="operator">=</span> <span class="keyword">new</span> DemoApplication(<span class="type"><a href="qstring.html">QString</a></span>()<span class="operator">,</span> QLatin1String(<span class="string">&quot;Exit Embedded Demo&quot;</span>)<span class="operator">,</span> <span class="type"><a href="qstring.html">QString</a></span>()<span class="operator">,</span> <span class="type"><a href="qstringlist.html">QStringList</a></span>());
demoList<span class="operator">.</span>append(exitItem);
<span class="keyword">return</span> <span class="keyword">true</span>;
}
<span class="type">void</span> FluidLauncher<span class="operator">::</span>parseDemos(<span class="type"><a href="qxmlstreamreader.html">QXmlStreamReader</a></span><span class="operator">&amp;</span> reader)
{
<span class="keyword">while</span> (<span class="operator">!</span>reader<span class="operator">.</span>atEnd()) {
reader<span class="operator">.</span>readNext();
<span class="keyword">if</span> (reader<span class="operator">.</span>isStartElement() <span class="operator">&amp;</span><span class="operator">&amp;</span> reader<span class="operator">.</span>name() <span class="operator">=</span><span class="operator">=</span> <span class="string">&quot;example&quot;</span>) {
<span class="type"><a href="qxmlstreamattributes.html">QXmlStreamAttributes</a></span> attrs <span class="operator">=</span> reader<span class="operator">.</span>attributes();
<span class="type"><a href="qstringref.html">QStringRef</a></span> filename <span class="operator">=</span> attrs<span class="operator">.</span>value(<span class="string">&quot;filename&quot;</span>);
<span class="keyword">if</span> (<span class="operator">!</span>filename<span class="operator">.</span>isEmpty()) {
<span class="type"><a href="qstringref.html">QStringRef</a></span> name <span class="operator">=</span> attrs<span class="operator">.</span>value(<span class="string">&quot;name&quot;</span>);
<span class="type"><a href="qstringref.html">QStringRef</a></span> image <span class="operator">=</span> attrs<span class="operator">.</span>value(<span class="string">&quot;image&quot;</span>);
<span class="type"><a href="qstringref.html">QStringRef</a></span> args <span class="operator">=</span> attrs<span class="operator">.</span>value(<span class="string">&quot;args&quot;</span>);
DemoApplication<span class="operator">*</span> newDemo <span class="operator">=</span> <span class="keyword">new</span> DemoApplication(
filename<span class="operator">.</span>toString()<span class="operator">,</span>
name<span class="operator">.</span>isEmpty() <span class="operator">?</span> <span class="string">&quot;Unnamed Demo&quot;</span> : name<span class="operator">.</span>toString()<span class="operator">,</span>
image<span class="operator">.</span>toString()<span class="operator">,</span>
args<span class="operator">.</span>toString()<span class="operator">.</span>split(<span class="string">&quot; &quot;</span>));
demoList<span class="operator">.</span>append(newDemo);
}
} <span class="keyword">else</span> <span class="keyword">if</span>(reader<span class="operator">.</span>isEndElement() <span class="operator">&amp;</span><span class="operator">&amp;</span> reader<span class="operator">.</span>name() <span class="operator">=</span><span class="operator">=</span> <span class="string">&quot;demos&quot;</span>) {
<span class="keyword">return</span>;
}
}
}
<span class="type">void</span> FluidLauncher<span class="operator">::</span>parseSlideshow(<span class="type"><a href="qxmlstreamreader.html">QXmlStreamReader</a></span><span class="operator">&amp;</span> reader)
{
<span class="type"><a href="qxmlstreamattributes.html">QXmlStreamAttributes</a></span> attrs <span class="operator">=</span> reader<span class="operator">.</span>attributes();
<span class="type"><a href="qstringref.html">QStringRef</a></span> timeout <span class="operator">=</span> attrs<span class="operator">.</span>value(<span class="string">&quot;timeout&quot;</span>);
<span class="type">bool</span> valid;
<span class="keyword">if</span> (<span class="operator">!</span>timeout<span class="operator">.</span>isEmpty()) {
<span class="type">int</span> t <span class="operator">=</span> timeout<span class="operator">.</span>toString()<span class="operator">.</span>toInt(<span class="operator">&amp;</span>valid);
<span class="keyword">if</span> (valid)
inputTimer<span class="operator">-</span><span class="operator">&gt;</span>setInterval(t);
}
<span class="type"><a href="qstringref.html">QStringRef</a></span> interval <span class="operator">=</span> attrs<span class="operator">.</span>value(<span class="string">&quot;interval&quot;</span>);
<span class="keyword">if</span> (<span class="operator">!</span>interval<span class="operator">.</span>isEmpty()) {
<span class="type">int</span> i <span class="operator">=</span> interval<span class="operator">.</span>toString()<span class="operator">.</span>toInt(<span class="operator">&amp;</span>valid);
<span class="keyword">if</span> (valid)
slideShowWidget<span class="operator">-</span><span class="operator">&gt;</span>setSlideInterval(i);
}
<span class="keyword">while</span> (<span class="operator">!</span>reader<span class="operator">.</span>atEnd()) {
reader<span class="operator">.</span>readNext();
<span class="keyword">if</span> (reader<span class="operator">.</span>isStartElement()) {
<span class="type"><a href="qxmlstreamattributes.html">QXmlStreamAttributes</a></span> attrs <span class="operator">=</span> reader<span class="operator">.</span>attributes();
<span class="keyword">if</span> (reader<span class="operator">.</span>name() <span class="operator">=</span><span class="operator">=</span> <span class="string">&quot;imagedir&quot;</span>) {
<span class="type"><a href="qstringref.html">QStringRef</a></span> dir <span class="operator">=</span> attrs<span class="operator">.</span>value(<span class="string">&quot;dir&quot;</span>);
slideShowWidget<span class="operator">-</span><span class="operator">&gt;</span>addImageDir(dir<span class="operator">.</span>toString());
} <span class="keyword">else</span> <span class="keyword">if</span>(reader<span class="operator">.</span>name() <span class="operator">=</span><span class="operator">=</span> <span class="string">&quot;image&quot;</span>) {
<span class="type"><a href="qstringref.html">QStringRef</a></span> image <span class="operator">=</span> attrs<span class="operator">.</span>value(<span class="string">&quot;image&quot;</span>);
slideShowWidget<span class="operator">-</span><span class="operator">&gt;</span>addImage(image<span class="operator">.</span>toString());
}
} <span class="keyword">else</span> <span class="keyword">if</span>(reader<span class="operator">.</span>isEndElement() <span class="operator">&amp;</span><span class="operator">&amp;</span> reader<span class="operator">.</span>name() <span class="operator">=</span><span class="operator">=</span> <span class="string">&quot;slideshow&quot;</span>) {
<span class="keyword">return</span>;
}
}
}
<span class="type">void</span> FluidLauncher<span class="operator">::</span>populatePictureFlow()
{
pictureFlowWidget<span class="operator">-</span><span class="operator">&gt;</span>setSlideCount(demoList<span class="operator">.</span>count());
<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span>demoList<span class="operator">.</span>count()<span class="operator">-</span><span class="number">1</span>; i<span class="operator">&gt;</span><span class="operator">=</span><span class="number">0</span>; <span class="operator">-</span><span class="operator">-</span>i) {
pictureFlowWidget<span class="operator">-</span><span class="operator">&gt;</span>setSlide(i<span class="operator">,</span> <span class="operator">*</span>(demoList<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">&gt;</span>getImage()));
pictureFlowWidget<span class="operator">-</span><span class="operator">&gt;</span>setSlideCaption(i<span class="operator">,</span> demoList<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">&gt;</span>getCaption());
}
pictureFlowWidget<span class="operator">-</span><span class="operator">&gt;</span>setCurrentSlide(demoList<span class="operator">.</span>count()<span class="operator">/</span><span class="number">2</span>);
}
<span class="type">void</span> FluidLauncher<span class="operator">::</span>launchApplication(<span class="type">int</span> index)
{
<span class="comment">// NOTE: Clearing the caches will free up more memory for the demo but will cause</span>
<span class="comment">// a delay upon returning, as items are reloaded.</span>
<span class="comment">//pictureFlowWidget-&gt;clearCaches();</span>
<span class="keyword">if</span> (index <span class="operator">=</span><span class="operator">=</span> demoList<span class="operator">.</span>size() <span class="operator">-</span><span class="number">1</span>) {
qApp<span class="operator">-</span><span class="operator">&gt;</span>quit();
<span class="keyword">return</span>;
}
inputTimer<span class="operator">-</span><span class="operator">&gt;</span>stop();
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(demoList<span class="operator">[</span>index<span class="operator">]</span><span class="operator">,</span> SIGNAL(demoFinished())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(demoFinished()));
demoList<span class="operator">[</span>index<span class="operator">]</span><span class="operator">-</span><span class="operator">&gt;</span>launch();
}
<span class="type">void</span> FluidLauncher<span class="operator">::</span>switchToLauncher()
{
slideShowWidget<span class="operator">-</span><span class="operator">&gt;</span>stopShow();
inputTimer<span class="operator">-</span><span class="operator">&gt;</span>start();
setCurrentWidget(pictureFlowWidget);
}
<span class="type">void</span> FluidLauncher<span class="operator">::</span>resetInputTimeout()
{
<span class="keyword">if</span> (inputTimer<span class="operator">-</span><span class="operator">&gt;</span>isActive())
inputTimer<span class="operator">-</span><span class="operator">&gt;</span>start();
}
<span class="type">void</span> FluidLauncher<span class="operator">::</span>inputTimedout()
{
switchToSlideshow();
}
<span class="type">void</span> FluidLauncher<span class="operator">::</span>switchToSlideshow()
{
inputTimer<span class="operator">-</span><span class="operator">&gt;</span>stop();
slideShowWidget<span class="operator">-</span><span class="operator">&gt;</span>startShow();
setCurrentWidget(slideShowWidget);
}
<span class="type">void</span> FluidLauncher<span class="operator">::</span>demoFinished()
{
setCurrentWidget(pictureFlowWidget);
inputTimer<span class="operator">-</span><span class="operator">&gt;</span>start();
<span class="comment">// Bring the Fluidlauncher to the foreground to allow selecting another demo</span>
raise();
activateWindow();
}
<span class="type">void</span> FluidLauncher<span class="operator">::</span>changeEvent(<span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">*</span> event)
{
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">&gt;</span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>ActivationChange) {
<span class="keyword">if</span> (isActiveWindow()) {
<span class="keyword">if</span>(currentWidget() <span class="operator">=</span><span class="operator">=</span> pictureFlowWidget) {
resetInputTimeout();
} <span class="keyword">else</span> {
slideShowWidget<span class="operator">-</span><span class="operator">&gt;</span>startShow();
}
} <span class="keyword">else</span> {
inputTimer<span class="operator">-</span><span class="operator">&gt;</span>stop();
slideShowWidget<span class="operator">-</span><span class="operator">&gt;</span>stopShow();
}
}
<span class="type"><a href="qstackedwidget.html">QStackedWidget</a></span><span class="operator">::</span>changeEvent(event);
}</pre>
</div>
<!-- @@@demos/embedded/fluidlauncher/fluidlauncher.cpp -->
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