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Breadcrumbs go here --> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <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: ** ** "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 <QtGui></span> <span class="preprocessor">#include "imageviewer.h"</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">></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">></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">></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">></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">></span>setWidget(imageLabel); setCentralWidget(scrollArea); createActions(); createMenus(); setWindowTitle(tr(<span class="string">"Image Viewer"</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">"Open File"</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">"Image Viewer"</span>)<span class="operator">,</span> tr(<span class="string">"Cannot load %1."</span>)<span class="operator">.</span>arg(fileName)); <span class="keyword">return</span>; } imageLabel<span class="operator">-</span><span class="operator">></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">></span>setEnabled(<span class="keyword">true</span>); fitToWindowAct<span class="operator">-</span><span class="operator">></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">></span>isChecked()) imageLabel<span class="operator">-</span><span class="operator">></span>adjustSize(); } } <span class="type">void</span> ImageViewer<span class="operator">::</span>print() { Q_ASSERT(imageLabel<span class="operator">-</span><span class="operator">></span>pixmap()); <span class="preprocessor">#ifndef QT_NO_PRINTER</span> <span class="type"><a href="qprintdialog.html">QPrintDialog</a></span> dialog(<span class="operator">&</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">&</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">></span>pixmap()<span class="operator">-</span><span class="operator">></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">></span>pixmap()<span class="operator">-</span><span class="operator">></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">></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">></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">></span>isChecked(); scrollArea<span class="operator">-</span><span class="operator">></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">"About Image Viewer"</span>)<span class="operator">,</span> tr(<span class="string">"<p>The <b>Image Viewer</b> example shows how to combine QLabel "</span> <span class="string">"and QScrollArea to display an image. QLabel is typically used "</span> <span class="string">"for displaying a text, but it can also display an image. "</span> <span class="string">"QScrollArea provides a scrolling view around another widget. "</span> <span class="string">"If the child widget exceeds the size of the frame, QScrollArea "</span> <span class="string">"automatically provides scroll bars. </p><p>The example "</span> <span class="string">"demonstrates how QLabel's ability to scale its contents "</span> <span class="string">"(QLabel::scaledContents), and QScrollArea's ability to "</span> <span class="string">"automatically resize its contents "</span> <span class="string">"(QScrollArea::widgetResizable), can be used to implement "</span> <span class="string">"zooming and scaling features. </p><p>In addition the example "</span> <span class="string">"shows how to use QPainter to print an image.</p>"</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">"&Open..."</span>)<span class="operator">,</span> <span class="keyword">this</span>); openAct<span class="operator">-</span><span class="operator">></span>setShortcut(tr(<span class="string">"Ctrl+O"</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">"&Print..."</span>)<span class="operator">,</span> <span class="keyword">this</span>); printAct<span class="operator">-</span><span class="operator">></span>setShortcut(tr(<span class="string">"Ctrl+P"</span>)); printAct<span class="operator">-</span><span class="operator">></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">"E&xit"</span>)<span class="operator">,</span> <span class="keyword">this</span>); exitAct<span class="operator">-</span><span class="operator">></span>setShortcut(tr(<span class="string">"Ctrl+Q"</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">"Zoom &In (25%)"</span>)<span class="operator">,</span> <span class="keyword">this</span>); zoomInAct<span class="operator">-</span><span class="operator">></span>setShortcut(tr(<span class="string">"Ctrl++"</span>)); zoomInAct<span class="operator">-</span><span class="operator">></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">"Zoom &Out (25%)"</span>)<span class="operator">,</span> <span class="keyword">this</span>); zoomOutAct<span class="operator">-</span><span class="operator">></span>setShortcut(tr(<span class="string">"Ctrl+-"</span>)); zoomOutAct<span class="operator">-</span><span class="operator">></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">"&Normal Size"</span>)<span class="operator">,</span> <span class="keyword">this</span>); normalSizeAct<span class="operator">-</span><span class="operator">></span>setShortcut(tr(<span class="string">"Ctrl+S"</span>)); normalSizeAct<span class="operator">-</span><span class="operator">></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">"&Fit to Window"</span>)<span class="operator">,</span> <span class="keyword">this</span>); fitToWindowAct<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>); fitToWindowAct<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>); fitToWindowAct<span class="operator">-</span><span class="operator">></span>setShortcut(tr(<span class="string">"Ctrl+F"</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">"&About"</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">"About &Qt"</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">"&File"</span>)<span class="operator">,</span> <span class="keyword">this</span>); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(openAct); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(printAct); fileMenu<span class="operator">-</span><span class="operator">></span>addSeparator(); fileMenu<span class="operator">-</span><span class="operator">></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">"&View"</span>)<span class="operator">,</span> <span class="keyword">this</span>); viewMenu<span class="operator">-</span><span class="operator">></span>addAction(zoomInAct); viewMenu<span class="operator">-</span><span class="operator">></span>addAction(zoomOutAct); viewMenu<span class="operator">-</span><span class="operator">></span>addAction(normalSizeAct); viewMenu<span class="operator">-</span><span class="operator">></span>addSeparator(); viewMenu<span class="operator">-</span><span class="operator">></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">"&Help"</span>)<span class="operator">,</span> <span class="keyword">this</span>); helpMenu<span class="operator">-</span><span class="operator">></span>addAction(aboutAct); helpMenu<span class="operator">-</span><span class="operator">></span>addAction(aboutQtAct); menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(fileMenu); menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(viewMenu); menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(helpMenu); } <span class="type">void</span> ImageViewer<span class="operator">::</span>updateActions() { zoomInAct<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="operator">!</span>fitToWindowAct<span class="operator">-</span><span class="operator">></span>isChecked()); zoomOutAct<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="operator">!</span>fitToWindowAct<span class="operator">-</span><span class="operator">></span>isChecked()); normalSizeAct<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="operator">!</span>fitToWindowAct<span class="operator">-</span><span class="operator">></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">></span>pixmap()); scaleFactor <span class="operator">*</span><span class="operator">=</span> factor; imageLabel<span class="operator">-</span><span class="operator">></span>resize(scaleFactor <span class="operator">*</span> imageLabel<span class="operator">-</span><span class="operator">></span>pixmap()<span class="operator">-</span><span class="operator">></span>size()); adjustScrollBar(scrollArea<span class="operator">-</span><span class="operator">></span>horizontalScrollBar()<span class="operator">,</span> factor); adjustScrollBar(scrollArea<span class="operator">-</span><span class="operator">></span>verticalScrollBar()<span class="operator">,</span> factor); zoomInAct<span class="operator">-</span><span class="operator">></span>setEnabled(scaleFactor <span class="operator"><</span> <span class="number">3.0</span>); zoomOutAct<span class="operator">-</span><span class="operator">></span>setEnabled(scaleFactor <span class="operator">></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">></span>setValue(<span class="type">int</span>(factor <span class="operator">*</span> scrollBar<span class="operator">-</span><span class="operator">></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">></span>pageStep()<span class="operator">/</span><span class="number">2</span>))); }</pre> </div> <!-- @@@widgets/imageviewer/imageviewer.cpp --> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd. 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