<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>imagewidget.cpp Example File | Qt Widgets 5.11</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td ><a href="../qtdoc/index.html">Qt 5.11</a></td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-gestures-imagegestures-example.html">Image Gestures Example</a></td><td >imagewidget.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.11.2 Reference Documentation</td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">imagewidget.cpp Example File</h1> <span class="subtitle">gestures/imagegestures/imagewidget.cpp</span> <!-- $$$gestures/imagegestures/imagewidget.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** 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 https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, 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 "imagewidget.h"</span> <span class="preprocessor">#include <QtWidgets></span> Q_LOGGING_CATEGORY(lcExample<span class="operator">,</span> <span class="string">"qt.examples.imagegestures"</span>) ImageWidget<span class="operator">::</span>ImageWidget(<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)<span class="operator">,</span> position(<span class="number">0</span>)<span class="operator">,</span> horizontalOffset(<span class="number">0</span>)<span class="operator">,</span> verticalOffset(<span class="number">0</span>)<span class="operator">,</span> rotationAngle(<span class="number">0</span>)<span class="operator">,</span> scaleFactor(<span class="number">1</span>)<span class="operator">,</span> currentStepScaleFactor(<span class="number">1</span>) { setMinimumSize(<span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">100</span><span class="operator">,</span><span class="number">100</span>)); } <span class="type">void</span> ImageWidget<span class="operator">::</span>grabGestures(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>GestureType<span class="operator">></span> <span class="operator">&</span>gestures) { foreach (<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>GestureType gesture<span class="operator">,</span> gestures) grabGesture(gesture); } bool ImageWidget<span class="operator">::</span>event(<span class="type"><a href="../qtcore/qevent.html">QEvent</a></span> <span class="operator">*</span>event) { <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>Gesture) <span class="keyword">return</span> gestureEvent(<span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qgestureevent.html">QGestureEvent</a></span><span class="operator">*</span><span class="operator">></span>(event)); <span class="keyword">return</span> <span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">::</span>event(event); } <span class="type">void</span> ImageWidget<span class="operator">::</span>paintEvent(<span class="type"><a href="../qtgui/qpaintevent.html">QPaintEvent</a></span><span class="operator">*</span>) { <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> p(<span class="keyword">this</span>); <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> iw <span class="operator">=</span> currentImage<span class="operator">.</span>width(); <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> ih <span class="operator">=</span> currentImage<span class="operator">.</span>height(); <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> wh <span class="operator">=</span> height(); <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> ww <span class="operator">=</span> width(); p<span class="operator">.</span>translate(ww<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> wh<span class="operator">/</span><span class="number">2</span>); p<span class="operator">.</span>translate(horizontalOffset<span class="operator">,</span> verticalOffset); p<span class="operator">.</span>rotate(rotationAngle); p<span class="operator">.</span>scale(currentStepScaleFactor <span class="operator">*</span> scaleFactor<span class="operator">,</span> currentStepScaleFactor <span class="operator">*</span> scaleFactor); p<span class="operator">.</span>translate(<span class="operator">-</span>iw<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> <span class="operator">-</span>ih<span class="operator">/</span><span class="number">2</span>); p<span class="operator">.</span>drawImage(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> currentImage); } <span class="type">void</span> ImageWidget<span class="operator">::</span>mouseDoubleClickEvent(<span class="type"><a href="../qtgui/qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>) { rotationAngle <span class="operator">=</span> <span class="number">0</span>; scaleFactor <span class="operator">=</span> <span class="number">1</span>; currentStepScaleFactor <span class="operator">=</span> <span class="number">1</span>; verticalOffset <span class="operator">=</span> <span class="number">0</span>; horizontalOffset <span class="operator">=</span> <span class="number">0</span>; update(); qCDebug(lcExample) <span class="operator"><</span><span class="operator"><</span> <span class="string">"reset on mouse double click"</span>; } bool ImageWidget<span class="operator">::</span>gestureEvent(<span class="type"><a href="qgestureevent.html">QGestureEvent</a></span> <span class="operator">*</span>event) { qCDebug(lcExample) <span class="operator"><</span><span class="operator"><</span> <span class="string">"gestureEvent():"</span> <span class="operator"><</span><span class="operator"><</span> event; <span class="keyword">if</span> (<span class="type"><a href="qgesture.html">QGesture</a></span> <span class="operator">*</span>swipe <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>gesture(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>SwipeGesture)) swipeTriggered(<span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qswipegesture.html">QSwipeGesture</a></span> <span class="operator">*</span><span class="operator">></span>(swipe)); <span class="keyword">else</span> <span class="keyword">if</span> (<span class="type"><a href="qgesture.html">QGesture</a></span> <span class="operator">*</span>pan <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>gesture(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>PanGesture)) panTriggered(<span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qpangesture.html">QPanGesture</a></span> <span class="operator">*</span><span class="operator">></span>(pan)); <span class="keyword">if</span> (<span class="type"><a href="qgesture.html">QGesture</a></span> <span class="operator">*</span>pinch <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>gesture(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>PinchGesture)) pinchTriggered(<span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qpinchgesture.html">QPinchGesture</a></span> <span class="operator">*</span><span class="operator">></span>(pinch)); <span class="keyword">return</span> <span class="keyword">true</span>; } <span class="type">void</span> ImageWidget<span class="operator">::</span>panTriggered(<span class="type"><a href="qpangesture.html">QPanGesture</a></span> <span class="operator">*</span>gesture) { <span class="preprocessor">#ifndef QT_NO_CURSOR</span> <span class="keyword">switch</span> (gesture<span class="operator">-</span><span class="operator">></span>state()) { <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>GestureStarted: <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>GestureUpdated: setCursor(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>SizeAllCursor); <span class="keyword">break</span>; <span class="keyword">default</span>: setCursor(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ArrowCursor); } <span class="preprocessor">#endif</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span> delta <span class="operator">=</span> gesture<span class="operator">-</span><span class="operator">></span>delta(); qCDebug(lcExample) <span class="operator"><</span><span class="operator"><</span> <span class="string">"panTriggered():"</span> <span class="operator"><</span><span class="operator"><</span> gesture; horizontalOffset <span class="operator">+</span><span class="operator">=</span> delta<span class="operator">.</span>x(); verticalOffset <span class="operator">+</span><span class="operator">=</span> delta<span class="operator">.</span>y(); update(); } <span class="type">void</span> ImageWidget<span class="operator">::</span>pinchTriggered(<span class="type"><a href="qpinchgesture.html">QPinchGesture</a></span> <span class="operator">*</span>gesture) { <span class="type"><a href="qpinchgesture.html">QPinchGesture</a></span><span class="operator">::</span>ChangeFlags changeFlags <span class="operator">=</span> gesture<span class="operator">-</span><span class="operator">></span>changeFlags(); <span class="keyword">if</span> (changeFlags <span class="operator">&</span> <span class="type"><a href="qpinchgesture.html">QPinchGesture</a></span><span class="operator">::</span>RotationAngleChanged) { <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> rotationDelta <span class="operator">=</span> gesture<span class="operator">-</span><span class="operator">></span>rotationAngle() <span class="operator">-</span> gesture<span class="operator">-</span><span class="operator">></span>lastRotationAngle(); rotationAngle <span class="operator">+</span><span class="operator">=</span> rotationDelta; qCDebug(lcExample) <span class="operator"><</span><span class="operator"><</span> <span class="string">"pinchTriggered(): rotate by"</span> <span class="operator"><</span><span class="operator"><</span> rotationDelta <span class="operator"><</span><span class="operator"><</span> <span class="string">"->"</span> <span class="operator"><</span><span class="operator"><</span> rotationAngle; } <span class="keyword">if</span> (changeFlags <span class="operator">&</span> <span class="type"><a href="qpinchgesture.html">QPinchGesture</a></span><span class="operator">::</span>ScaleFactorChanged) { currentStepScaleFactor <span class="operator">=</span> gesture<span class="operator">-</span><span class="operator">></span>totalScaleFactor(); qCDebug(lcExample) <span class="operator"><</span><span class="operator"><</span> <span class="string">"pinchTriggered(): zoom by"</span> <span class="operator"><</span><span class="operator"><</span> gesture<span class="operator">-</span><span class="operator">></span>scaleFactor() <span class="operator"><</span><span class="operator"><</span> <span class="string">"->"</span> <span class="operator"><</span><span class="operator"><</span> currentStepScaleFactor; } <span class="keyword">if</span> (gesture<span class="operator">-</span><span class="operator">></span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>GestureFinished) { scaleFactor <span class="operator">*</span><span class="operator">=</span> currentStepScaleFactor; currentStepScaleFactor <span class="operator">=</span> <span class="number">1</span>; } update(); } <span class="type">void</span> ImageWidget<span class="operator">::</span>swipeTriggered(<span class="type"><a href="qswipegesture.html">QSwipeGesture</a></span> <span class="operator">*</span>gesture) { <span class="keyword">if</span> (gesture<span class="operator">-</span><span class="operator">></span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>GestureFinished) { <span class="keyword">if</span> (gesture<span class="operator">-</span><span class="operator">></span>horizontalDirection() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qswipegesture.html">QSwipeGesture</a></span><span class="operator">::</span>Left <span class="operator">|</span><span class="operator">|</span> gesture<span class="operator">-</span><span class="operator">></span>verticalDirection() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qswipegesture.html">QSwipeGesture</a></span><span class="operator">::</span>Up) { qCDebug(lcExample) <span class="operator"><</span><span class="operator"><</span> <span class="string">"swipeTriggered(): swipe to previous"</span>; goPrevImage(); } <span class="keyword">else</span> { qCDebug(lcExample) <span class="operator"><</span><span class="operator"><</span> <span class="string">"swipeTriggered(): swipe to next"</span>; goNextImage(); } update(); } } <span class="type">void</span> ImageWidget<span class="operator">::</span>resizeEvent(<span class="type"><a href="../qtgui/qresizeevent.html">QResizeEvent</a></span><span class="operator">*</span>) { update(); } <span class="type">void</span> ImageWidget<span class="operator">::</span>openDirectory(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>path) { <span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>path <span class="operator">=</span> path; <span class="type"><a href="../qtcore/qdir.html">QDir</a></span> dir(path); <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> nameFilters; nameFilters <span class="operator"><</span><span class="operator"><</span> <span class="string">"*.jpg"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"*.png"</span>; files <span class="operator">=</span> dir<span class="operator">.</span>entryList(nameFilters<span class="operator">,</span> <span class="type"><a href="../qtcore/qdir.html">QDir</a></span><span class="operator">::</span>Files<span class="operator">|</span><span class="type"><a href="../qtcore/qdir.html">QDir</a></span><span class="operator">::</span>Readable<span class="operator">,</span> <span class="type"><a href="../qtcore/qdir.html">QDir</a></span><span class="operator">::</span>Name); position <span class="operator">=</span> <span class="number">0</span>; goToImage(<span class="number">0</span>); update(); } <span class="type"><a href="../qtgui/qimage.html">QImage</a></span> ImageWidget<span class="operator">::</span>loadImage(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fileName) { <span class="type"><a href="../qtgui/qimagereader.html">QImageReader</a></span> reader(fileName); reader<span class="operator">.</span>setAutoTransform(<span class="keyword">true</span>); qCDebug(lcExample) <span class="operator"><</span><span class="operator"><</span> <span class="string">"loading"</span> <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qdir.html">QDir</a></span><span class="operator">::</span>toNativeSeparators(fileName) <span class="operator"><</span><span class="operator"><</span> position <span class="operator"><</span><span class="operator"><</span> <span class="char">'/'</span> <span class="operator"><</span><span class="operator"><</span> files<span class="operator">.</span>size(); <span class="keyword">if</span> (<span class="operator">!</span>reader<span class="operator">.</span>canRead()) { qCWarning(lcExample) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qdir.html">QDir</a></span><span class="operator">::</span>toNativeSeparators(fileName) <span class="operator"><</span><span class="operator"><</span> <span class="string">": can't load image"</span>; <span class="keyword">return</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span>(); } <span class="type"><a href="../qtgui/qimage.html">QImage</a></span> image; <span class="keyword">if</span> (<span class="operator">!</span>reader<span class="operator">.</span>read(<span class="operator">&</span>image)) { qCWarning(lcExample) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qdir.html">QDir</a></span><span class="operator">::</span>toNativeSeparators(fileName) <span class="operator"><</span><span class="operator"><</span> <span class="string">": corrupted image: "</span> <span class="operator"><</span><span class="operator"><</span> reader<span class="operator">.</span>errorString(); <span class="keyword">return</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span>(); } <span class="keyword">const</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> maximumSize(<span class="number">2000</span><span class="operator">,</span> <span class="number">2000</span>); <span class="comment">// Reduce in case someone has large photo images.</span> <span class="keyword">if</span> (image<span class="operator">.</span>size()<span class="operator">.</span>width() <span class="operator">></span> maximumSize<span class="operator">.</span>width() <span class="operator">|</span><span class="operator">|</span> image<span class="operator">.</span>height() <span class="operator">></span> maximumSize<span class="operator">.</span>height()) image <span class="operator">=</span> image<span class="operator">.</span>scaled(maximumSize<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>KeepAspectRatio<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>SmoothTransformation); <span class="keyword">return</span> image; } <span class="type">void</span> ImageWidget<span class="operator">::</span>goNextImage() { <span class="keyword">if</span> (files<span class="operator">.</span>isEmpty()) <span class="keyword">return</span>; <span class="keyword">if</span> (position <span class="operator"><</span> files<span class="operator">.</span>size()<span class="operator">-</span><span class="number">1</span>) { <span class="operator">+</span><span class="operator">+</span>position; prevImage <span class="operator">=</span> currentImage; currentImage <span class="operator">=</span> nextImage; <span class="keyword">if</span> (position<span class="operator">+</span><span class="number">1</span> <span class="operator"><</span> files<span class="operator">.</span>size()) nextImage <span class="operator">=</span> loadImage(path <span class="operator">+</span> QLatin1Char(<span class="char">'/'</span>) <span class="operator">+</span> files<span class="operator">.</span>at(position<span class="operator">+</span><span class="number">1</span>)); <span class="keyword">else</span> nextImage <span class="operator">=</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span>(); } update(); } <span class="type">void</span> ImageWidget<span class="operator">::</span>goPrevImage() { <span class="keyword">if</span> (files<span class="operator">.</span>isEmpty()) <span class="keyword">return</span>; <span class="keyword">if</span> (position <span class="operator">></span> <span class="number">0</span>) { <span class="operator">-</span><span class="operator">-</span>position; nextImage <span class="operator">=</span> currentImage; currentImage <span class="operator">=</span> prevImage; <span class="keyword">if</span> (position <span class="operator">></span> <span class="number">0</span>) prevImage <span class="operator">=</span> loadImage(path <span class="operator">+</span> QLatin1Char(<span class="char">'/'</span>) <span class="operator">+</span> files<span class="operator">.</span>at(position<span class="operator">-</span><span class="number">1</span>)); <span class="keyword">else</span> prevImage <span class="operator">=</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span>(); } update(); } <span class="type">void</span> ImageWidget<span class="operator">::</span>goToImage(<span class="type">int</span> index) { <span class="keyword">if</span> (files<span class="operator">.</span>isEmpty()) <span class="keyword">return</span>; <span class="keyword">if</span> (index <span class="operator"><</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> index <span class="operator">></span><span class="operator">=</span> files<span class="operator">.</span>size()) { qCWarning(lcExample) <span class="operator"><</span><span class="operator"><</span> <span class="string">"goToImage: invalid index: "</span> <span class="operator"><</span><span class="operator"><</span> index; <span class="keyword">return</span>; } <span class="keyword">if</span> (index <span class="operator">=</span><span class="operator">=</span> position<span class="operator">+</span><span class="number">1</span>) { goNextImage(); <span class="keyword">return</span>; } <span class="keyword">if</span> (position <span class="operator">></span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> index <span class="operator">=</span><span class="operator">=</span> position<span class="operator">-</span><span class="number">1</span>) { goPrevImage(); <span class="keyword">return</span>; } position <span class="operator">=</span> index; <span class="keyword">if</span> (index <span class="operator">></span> <span class="number">0</span>) prevImage <span class="operator">=</span> loadImage(path <span class="operator">+</span> QLatin1Char(<span class="char">'/'</span>) <span class="operator">+</span> files<span class="operator">.</span>at(position<span class="operator">-</span><span class="number">1</span>)); <span class="keyword">else</span> prevImage <span class="operator">=</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span>(); currentImage <span class="operator">=</span> loadImage(path <span class="operator">+</span> QLatin1Char(<span class="char">'/'</span>) <span class="operator">+</span> files<span class="operator">.</span>at(position)); <span class="keyword">if</span> (position<span class="operator">+</span><span class="number">1</span> <span class="operator"><</span> files<span class="operator">.</span>size()) nextImage <span class="operator">=</span> loadImage(path <span class="operator">+</span> QLatin1Char(<span class="char">'/'</span>) <span class="operator">+</span> files<span class="operator">.</span>at(position<span class="operator">+</span><span class="number">1</span>)); <span class="keyword">else</span> nextImage <span class="operator">=</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span>(); update(); } </pre> </div> <!-- @@@gestures/imagegestures/imagewidget.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2018 The Qt Company Ltd. 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/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>