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qt4-x11/doc/html/demos-embedded-fluidlauncher-slideshow-cpp.html
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<h1 class="title">slideshow.cpp Example File</h1>
<span class="small-subtitle">demos/embedded/fluidlauncher/slideshow.cpp</span>
<!-- $$$demos/embedded/fluidlauncher/slideshow.cpp-description -->
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<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
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** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &lt;QBasicTimer&gt;</span>
<span class="preprocessor">#include &lt;QList&gt;</span>
<span class="preprocessor">#include &lt;QImage&gt;</span>
<span class="preprocessor">#include &lt;QDir&gt;</span>
<span class="preprocessor">#include &lt;QPainter&gt;</span>
<span class="preprocessor">#include &lt;QPaintEvent&gt;</span>
<span class="preprocessor">#include &lt;QDebug&gt;</span>
<span class="preprocessor">#include &quot;slideshow.h&quot;</span>
<span class="keyword">class</span> SlideShowPrivate
{
<span class="keyword">public</span>:
SlideShowPrivate();
<span class="type">int</span> currentSlide;
<span class="type">int</span> slideInterval;
<span class="type"><a href="qbasictimer.html">QBasicTimer</a></span> interSlideTimer;
<span class="type"><a href="qstringlist.html">QStringList</a></span> imagePaths;
<span class="type">void</span> showNextSlide();
};
SlideShowPrivate<span class="operator">::</span>SlideShowPrivate()
{
currentSlide <span class="operator">=</span> <span class="number">0</span>;
slideInterval <span class="operator">=</span> <span class="number">10000</span>; <span class="comment">// Default to 10 sec interval</span>
}
<span class="type">void</span> SlideShowPrivate<span class="operator">::</span>showNextSlide()
{
currentSlide<span class="operator">+</span><span class="operator">+</span>;
<span class="keyword">if</span> (currentSlide <span class="operator">&gt;</span><span class="operator">=</span> imagePaths<span class="operator">.</span>size())
currentSlide <span class="operator">=</span> <span class="number">0</span>;
}
SlideShow<span class="operator">::</span>SlideShow(<span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">*</span> parent) :
<span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
{
d <span class="operator">=</span> <span class="keyword">new</span> SlideShowPrivate;
setAttribute(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WA_StaticContents<span class="operator">,</span> <span class="keyword">true</span>);
setAttribute(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WA_OpaquePaintEvent<span class="operator">,</span> <span class="keyword">true</span>);
setAttribute(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WA_NoSystemBackground<span class="operator">,</span> <span class="keyword">true</span>);
setMouseTracking(<span class="keyword">true</span>);
}
SlideShow<span class="operator">::</span><span class="operator">~</span>SlideShow()
{
<span class="keyword">delete</span> d;
}
<span class="type">void</span> SlideShow<span class="operator">::</span>addImageDir(<span class="type"><a href="qstring.html">QString</a></span> dirName)
{
<span class="type"><a href="qdir.html">QDir</a></span> dir(dirName);
<span class="type"><a href="qstringlist.html">QStringList</a></span> fileNames <span class="operator">=</span> dir<span class="operator">.</span>entryList(<span class="type"><a href="qdir.html">QDir</a></span><span class="operator">::</span>Files <span class="operator">|</span> <span class="type"><a href="qdir.html">QDir</a></span><span class="operator">::</span>Readable<span class="operator">,</span> <span class="type"><a href="qdir.html">QDir</a></span><span class="operator">::</span>Name);
<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator">&lt;</span>fileNames<span class="operator">.</span>count(); i<span class="operator">+</span><span class="operator">+</span>)
d<span class="operator">-</span><span class="operator">&gt;</span>imagePaths <span class="operator">&lt;</span><span class="operator">&lt;</span> dir<span class="operator">.</span>absoluteFilePath(fileNames<span class="operator">[</span>i<span class="operator">]</span>);
}
<span class="type">void</span> SlideShow<span class="operator">::</span>addImage(<span class="type"><a href="qstring.html">QString</a></span> filename)
{
d<span class="operator">-</span><span class="operator">&gt;</span>imagePaths <span class="operator">&lt;</span><span class="operator">&lt;</span> filename;
}
<span class="type">void</span> SlideShow<span class="operator">::</span>clearImages()
{
d<span class="operator">-</span><span class="operator">&gt;</span>imagePaths<span class="operator">.</span>clear();
}
<span class="type">void</span> SlideShow<span class="operator">::</span>startShow()
{
d<span class="operator">-</span><span class="operator">&gt;</span>interSlideTimer<span class="operator">.</span>start(d<span class="operator">-</span><span class="operator">&gt;</span>slideInterval<span class="operator">,</span> <span class="keyword">this</span>);
d<span class="operator">-</span><span class="operator">&gt;</span>showNextSlide();
update();
}
<span class="type">void</span> SlideShow<span class="operator">::</span>stopShow()
{
d<span class="operator">-</span><span class="operator">&gt;</span>interSlideTimer<span class="operator">.</span>stop();
}
<span class="type">int</span> SlideShow<span class="operator">::</span>slideInterval()
{
<span class="keyword">return</span> d<span class="operator">-</span><span class="operator">&gt;</span>slideInterval;
}
<span class="type">void</span> SlideShow<span class="operator">::</span>setSlideInterval(<span class="type">int</span> val)
{
d<span class="operator">-</span><span class="operator">&gt;</span>slideInterval <span class="operator">=</span> val;
}
<span class="type">void</span> SlideShow<span class="operator">::</span>timerEvent(<span class="type"><a href="qtimerevent.html">QTimerEvent</a></span><span class="operator">*</span> event)
{
Q_UNUSED(event);
d<span class="operator">-</span><span class="operator">&gt;</span>showNextSlide();
update();
}
<span class="type">void</span> SlideShow<span class="operator">::</span>paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event)
{
<span class="type"><a href="qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>);
painter<span class="operator">.</span>setRenderHint(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing<span class="operator">,</span> <span class="keyword">false</span>);
<span class="keyword">if</span> (d<span class="operator">-</span><span class="operator">&gt;</span>imagePaths<span class="operator">.</span>size() <span class="operator">&gt;</span> <span class="number">0</span>) {
<span class="type"><a href="qpixmap.html">QPixmap</a></span> slide <span class="operator">=</span> <span class="type"><a href="qpixmap.html">QPixmap</a></span>(d<span class="operator">-</span><span class="operator">&gt;</span>imagePaths<span class="operator">[</span>d<span class="operator">-</span><span class="operator">&gt;</span>currentSlide<span class="operator">]</span>);
<span class="type"><a href="qsize.html">QSize</a></span> slideSize <span class="operator">=</span> slide<span class="operator">.</span>size();
<span class="type"><a href="qsize.html">QSize</a></span> scaledSize <span class="operator">=</span> <span class="type"><a href="qsize.html">QSize</a></span>(<a href="qtglobal.html#qMin">qMin</a>(slideSize<span class="operator">.</span>width()<span class="operator">,</span> size()<span class="operator">.</span>width())<span class="operator">,</span>
<a href="qtglobal.html#qMin">qMin</a>(slideSize<span class="operator">.</span>height()<span class="operator">,</span> size()<span class="operator">.</span>height()));
<span class="keyword">if</span> (slideSize <span class="operator">!</span><span class="operator">=</span> scaledSize)
slide <span class="operator">=</span> slide<span class="operator">.</span>scaled(scaledSize<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>KeepAspectRatio);
<span class="type"><a href="qrect.html">QRect</a></span> pixmapRect(<a href="qtglobal.html#qMax">qMax</a>( (size()<span class="operator">.</span>width() <span class="operator">-</span> slide<span class="operator">.</span>width())<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span>
<a href="qtglobal.html#qMax">qMax</a>( (size()<span class="operator">.</span>height() <span class="operator">-</span> slide<span class="operator">.</span>height())<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span>
slide<span class="operator">.</span>width()<span class="operator">,</span>
slide<span class="operator">.</span>height());
<span class="keyword">if</span> (pixmapRect<span class="operator">.</span>top() <span class="operator">&gt;</span> <span class="number">0</span>) {
<span class="comment">// Fill in top &amp; bottom rectangles:</span>
painter<span class="operator">.</span>fillRect(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> size()<span class="operator">.</span>width()<span class="operator">,</span> pixmapRect<span class="operator">.</span>top()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
painter<span class="operator">.</span>fillRect(<span class="number">0</span><span class="operator">,</span> pixmapRect<span class="operator">.</span>bottom()<span class="operator">,</span> size()<span class="operator">.</span>width()<span class="operator">,</span> size()<span class="operator">.</span>height()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
}
<span class="keyword">if</span> (pixmapRect<span class="operator">.</span>left() <span class="operator">&gt;</span> <span class="number">0</span>) {
<span class="comment">// Fill in left &amp; right rectangles:</span>
painter<span class="operator">.</span>fillRect(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> pixmapRect<span class="operator">.</span>left()<span class="operator">,</span> size()<span class="operator">.</span>height()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
painter<span class="operator">.</span>fillRect(pixmapRect<span class="operator">.</span>right()<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> size()<span class="operator">.</span>width()<span class="operator">,</span> size()<span class="operator">.</span>height()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
}
painter<span class="operator">.</span>drawPixmap(pixmapRect<span class="operator">,</span> slide);
} <span class="keyword">else</span>
painter<span class="operator">.</span>fillRect(event<span class="operator">-</span><span class="operator">&gt;</span>rect()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
}
<span class="type">void</span> SlideShow<span class="operator">::</span>keyPressEvent(<span class="type"><a href="qkeyevent.html">QKeyEvent</a></span><span class="operator">*</span> event)
{
Q_UNUSED(event);
<span class="keyword">emit</span> inputReceived();
}
<span class="type">void</span> SlideShow<span class="operator">::</span>mouseMoveEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span><span class="operator">*</span> event)
{
Q_UNUSED(event);
<span class="keyword">emit</span> inputReceived();
}
<span class="type">void</span> SlideShow<span class="operator">::</span>mousePressEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span><span class="operator">*</span> event)
{
Q_UNUSED(event);
<span class="keyword">emit</span> inputReceived();
}
<span class="type">void</span> SlideShow<span class="operator">::</span>mouseReleaseEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span><span class="operator">*</span> event)
{
Q_UNUSED(event);
<span class="keyword">emit</span> inputReceived();
}
<span class="type">void</span> SlideShow<span class="operator">::</span>showEvent(<span class="type"><a href="qshowevent.html">QShowEvent</a></span> <span class="operator">*</span> event )
{
Q_UNUSED(event);
<span class="preprocessor">#ifndef QT_NO_CURSOR</span>
setCursor(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>BlankCursor);
<span class="preprocessor">#endif</span>
}</pre>
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<!-- @@@demos/embedded/fluidlauncher/slideshow.cpp -->
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