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<h1 class="title">imageviewer.cpp Example File</h1>
<span class="small-subtitle">widgets/imageviewer/imageviewer.cpp</span>
<!-- $$$widgets/imageviewer/imageviewer.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 examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** &quot;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
** &quot;AS IS&quot; 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.&quot;
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &lt;QtGui&gt;</span>
<span class="preprocessor">#include &quot;imageviewer.h&quot;</span>
ImageViewer<span class="operator">::</span>ImageViewer()
{
imageLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
imageLabel<span class="operator">-</span><span class="operator">&gt;</span>setBackgroundRole(<span class="type"><a href="qpalette.html">QPalette</a></span><span class="operator">::</span>Base);
imageLabel<span class="operator">-</span><span class="operator">&gt;</span>setSizePolicy(<span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Ignored<span class="operator">,</span> <span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Ignored);
imageLabel<span class="operator">-</span><span class="operator">&gt;</span>setScaledContents(<span class="keyword">true</span>);
scrollArea <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qscrollarea.html">QScrollArea</a></span>;
scrollArea<span class="operator">-</span><span class="operator">&gt;</span>setBackgroundRole(<span class="type"><a href="qpalette.html">QPalette</a></span><span class="operator">::</span>Dark);
scrollArea<span class="operator">-</span><span class="operator">&gt;</span>setWidget(imageLabel);
setCentralWidget(scrollArea);
createActions();
createMenus();
setWindowTitle(tr(<span class="string">&quot;Image Viewer&quot;</span>));
resize(<span class="number">500</span><span class="operator">,</span> <span class="number">400</span>);
}
<span class="type">void</span> ImageViewer<span class="operator">::</span>open()
{
<span class="type"><a href="qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getOpenFileName(<span class="keyword">this</span><span class="operator">,</span>
tr(<span class="string">&quot;Open File&quot;</span>)<span class="operator">,</span> <span class="type"><a href="qdir.html">QDir</a></span><span class="operator">::</span>currentPath());
<span class="keyword">if</span> (<span class="operator">!</span>fileName<span class="operator">.</span>isEmpty()) {
<span class="type"><a href="qimage.html">QImage</a></span> image(fileName);
<span class="keyword">if</span> (image<span class="operator">.</span>isNull()) {
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Image Viewer&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;Cannot load %1.&quot;</span>)<span class="operator">.</span>arg(fileName));
<span class="keyword">return</span>;
}
imageLabel<span class="operator">-</span><span class="operator">&gt;</span>setPixmap(<span class="type"><a href="qpixmap.html">QPixmap</a></span><span class="operator">::</span>fromImage(image));
scaleFactor <span class="operator">=</span> <span class="number">1.0</span>;
printAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">true</span>);
fitToWindowAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">true</span>);
updateActions();
<span class="keyword">if</span> (<span class="operator">!</span>fitToWindowAct<span class="operator">-</span><span class="operator">&gt;</span>isChecked())
imageLabel<span class="operator">-</span><span class="operator">&gt;</span>adjustSize();
}
}
<span class="type">void</span> ImageViewer<span class="operator">::</span>print()
{
Q_ASSERT(imageLabel<span class="operator">-</span><span class="operator">&gt;</span>pixmap());
<span class="preprocessor">#ifndef QT_NO_PRINTER</span>
<span class="type"><a href="qprintdialog.html">QPrintDialog</a></span> dialog(<span class="operator">&amp;</span>printer<span class="operator">,</span> <span class="keyword">this</span>);
<span class="keyword">if</span> (dialog<span class="operator">.</span>exec()) {
<span class="type"><a href="qpainter.html">QPainter</a></span> painter(<span class="operator">&amp;</span>printer);
<span class="type"><a href="qrect.html">QRect</a></span> rect <span class="operator">=</span> painter<span class="operator">.</span>viewport();
<span class="type"><a href="qsize.html">QSize</a></span> size <span class="operator">=</span> imageLabel<span class="operator">-</span><span class="operator">&gt;</span>pixmap()<span class="operator">-</span><span class="operator">&gt;</span>size();
size<span class="operator">.</span>scale(rect<span class="operator">.</span>size()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>KeepAspectRatio);
painter<span class="operator">.</span>setViewport(rect<span class="operator">.</span>x()<span class="operator">,</span> rect<span class="operator">.</span>y()<span class="operator">,</span> size<span class="operator">.</span>width()<span class="operator">,</span> size<span class="operator">.</span>height());
painter<span class="operator">.</span>setWindow(imageLabel<span class="operator">-</span><span class="operator">&gt;</span>pixmap()<span class="operator">-</span><span class="operator">&gt;</span>rect());
painter<span class="operator">.</span>drawPixmap(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="operator">*</span>imageLabel<span class="operator">-</span><span class="operator">&gt;</span>pixmap());
}
<span class="preprocessor">#endif</span>
}
<span class="type">void</span> ImageViewer<span class="operator">::</span>zoomIn()
{
scaleImage(<span class="number">1.25</span>);
}
<span class="type">void</span> ImageViewer<span class="operator">::</span>zoomOut()
{
scaleImage(<span class="number">0.8</span>);
}
<span class="type">void</span> ImageViewer<span class="operator">::</span>normalSize()
{
imageLabel<span class="operator">-</span><span class="operator">&gt;</span>adjustSize();
scaleFactor <span class="operator">=</span> <span class="number">1.0</span>;
}
<span class="type">void</span> ImageViewer<span class="operator">::</span>fitToWindow()
{
<span class="type">bool</span> fitToWindow <span class="operator">=</span> fitToWindowAct<span class="operator">-</span><span class="operator">&gt;</span>isChecked();
scrollArea<span class="operator">-</span><span class="operator">&gt;</span>setWidgetResizable(fitToWindow);
<span class="keyword">if</span> (<span class="operator">!</span>fitToWindow) {
normalSize();
}
updateActions();
}
<span class="type">void</span> ImageViewer<span class="operator">::</span>about()
{
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>about(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;About Image Viewer&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;&lt;p&gt;The &lt;b&gt;Image Viewer&lt;/b&gt; example shows how to combine QLabel &quot;</span>
<span class="string">&quot;and QScrollArea to display an image. QLabel is typically used &quot;</span>
<span class="string">&quot;for displaying a text, but it can also display an image. &quot;</span>
<span class="string">&quot;QScrollArea provides a scrolling view around another widget. &quot;</span>
<span class="string">&quot;If the child widget exceeds the size of the frame, QScrollArea &quot;</span>
<span class="string">&quot;automatically provides scroll bars. &lt;/p&gt;&lt;p&gt;The example &quot;</span>
<span class="string">&quot;demonstrates how QLabel's ability to scale its contents &quot;</span>
<span class="string">&quot;(QLabel::scaledContents), and QScrollArea's ability to &quot;</span>
<span class="string">&quot;automatically resize its contents &quot;</span>
<span class="string">&quot;(QScrollArea::widgetResizable), can be used to implement &quot;</span>
<span class="string">&quot;zooming and scaling features. &lt;/p&gt;&lt;p&gt;In addition the example &quot;</span>
<span class="string">&quot;shows how to use QPainter to print an image.&lt;/p&gt;&quot;</span>));
}
<span class="type">void</span> ImageViewer<span class="operator">::</span>createActions()
{
openAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Open...&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
openAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Ctrl+O&quot;</span>));
connect(openAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(open()));
printAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Print...&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
printAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Ctrl+P&quot;</span>));
printAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
connect(printAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(print()));
exitAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;E&amp;xit&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
exitAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Ctrl+Q&quot;</span>));
connect(exitAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));
zoomInAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;Zoom &amp;In (25%)&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
zoomInAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Ctrl++&quot;</span>));
zoomInAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
connect(zoomInAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(zoomIn()));
zoomOutAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;Zoom &amp;Out (25%)&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
zoomOutAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Ctrl+-&quot;</span>));
zoomOutAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
connect(zoomOutAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(zoomOut()));
normalSizeAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Normal Size&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
normalSizeAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Ctrl+S&quot;</span>));
normalSizeAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
connect(normalSizeAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(normalSize()));
fitToWindowAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Fit to Window&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
fitToWindowAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
fitToWindowAct<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
fitToWindowAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Ctrl+F&quot;</span>));
connect(fitToWindowAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(fitToWindow()));
aboutAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;About&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
connect(aboutAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(about()));
aboutQtAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;About &amp;Qt&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
connect(aboutQtAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(aboutQt()));
}
<span class="type">void</span> ImageViewer<span class="operator">::</span>createMenus()
{
fileMenu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(tr(<span class="string">&quot;&amp;File&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(openAct);
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(printAct);
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addSeparator();
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(exitAct);
viewMenu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(tr(<span class="string">&quot;&amp;View&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
viewMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(zoomInAct);
viewMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(zoomOutAct);
viewMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(normalSizeAct);
viewMenu<span class="operator">-</span><span class="operator">&gt;</span>addSeparator();
viewMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(fitToWindowAct);
helpMenu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(tr(<span class="string">&quot;&amp;Help&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
helpMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(aboutAct);
helpMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(aboutQtAct);
menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(fileMenu);
menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(viewMenu);
menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(helpMenu);
}
<span class="type">void</span> ImageViewer<span class="operator">::</span>updateActions()
{
zoomInAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="operator">!</span>fitToWindowAct<span class="operator">-</span><span class="operator">&gt;</span>isChecked());
zoomOutAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="operator">!</span>fitToWindowAct<span class="operator">-</span><span class="operator">&gt;</span>isChecked());
normalSizeAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="operator">!</span>fitToWindowAct<span class="operator">-</span><span class="operator">&gt;</span>isChecked());
}
<span class="type">void</span> ImageViewer<span class="operator">::</span>scaleImage(<span class="type">double</span> factor)
{
Q_ASSERT(imageLabel<span class="operator">-</span><span class="operator">&gt;</span>pixmap());
scaleFactor <span class="operator">*</span><span class="operator">=</span> factor;
imageLabel<span class="operator">-</span><span class="operator">&gt;</span>resize(scaleFactor <span class="operator">*</span> imageLabel<span class="operator">-</span><span class="operator">&gt;</span>pixmap()<span class="operator">-</span><span class="operator">&gt;</span>size());
adjustScrollBar(scrollArea<span class="operator">-</span><span class="operator">&gt;</span>horizontalScrollBar()<span class="operator">,</span> factor);
adjustScrollBar(scrollArea<span class="operator">-</span><span class="operator">&gt;</span>verticalScrollBar()<span class="operator">,</span> factor);
zoomInAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(scaleFactor <span class="operator">&lt;</span> <span class="number">3.0</span>);
zoomOutAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(scaleFactor <span class="operator">&gt;</span> <span class="number">0.333</span>);
}
<span class="type">void</span> ImageViewer<span class="operator">::</span>adjustScrollBar(<span class="type"><a href="qscrollbar.html">QScrollBar</a></span> <span class="operator">*</span>scrollBar<span class="operator">,</span> <span class="type">double</span> factor)
{
scrollBar<span class="operator">-</span><span class="operator">&gt;</span>setValue(<span class="type">int</span>(factor <span class="operator">*</span> scrollBar<span class="operator">-</span><span class="operator">&gt;</span>value()
<span class="operator">+</span> ((factor <span class="operator">-</span> <span class="number">1</span>) <span class="operator">*</span> scrollBar<span class="operator">-</span><span class="operator">&gt;</span>pageStep()<span class="operator">/</span><span class="number">2</span>)));
}</pre>
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<!-- @@@widgets/imageviewer/imageviewer.cpp -->
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