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<h1 class="title">main.cpp Example File</h1>
<span class="subtitle">gestures/imagegestures/main.cpp</span>
<!-- $$$gestures/imagegestures/main.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 <QtWidgets></span>
<span class="preprocessor">#include "mainwidget.h"</span>
<span class="keyword">static</span> <span class="type">void</span> showHelp(<span class="type"><a href="../qtcore/qcommandlineparser.html">QCommandLineParser</a></span> <span class="operator">&</span>parser<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> errorMessage <span class="operator">=</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>())
{
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> text;
<span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> str(<span class="operator">&</span>text);
str <span class="operator"><</span><span class="operator"><</span> <span class="string">"<html><head/><body>"</span>;
<span class="keyword">if</span> (<span class="operator">!</span>errorMessage<span class="operator">.</span>isEmpty())
str <span class="operator"><</span><span class="operator"><</span> <span class="string">"<p>"</span> <span class="operator"><</span><span class="operator"><</span> errorMessage <span class="operator"><</span><span class="operator"><</span> <span class="string">"</p>"</span>;
str <span class="operator"><</span><span class="operator"><</span> <span class="string">"<pre>"</span> <span class="operator"><</span><span class="operator"><</span> parser<span class="operator">.</span>helpText() <span class="operator"><</span><span class="operator"><</span> <span class="string">"</pre></body></html>"</span>;
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span> box(errorMessage<span class="operator">.</span>isEmpty() <span class="operator">?</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Information : <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Warning<span class="operator">,</span>
<span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span><span class="operator">::</span>applicationDisplayName()<span class="operator">,</span> text<span class="operator">,</span>
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Ok);
box<span class="operator">.</span>setTextInteractionFlags(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>TextBrowserInteraction);
box<span class="operator">.</span>exec();
}
<span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span>argv<span class="operator">[</span><span class="operator">]</span>)
{
<span class="type"><a href="qapplication.html">QApplication</a></span> app(argc<span class="operator">,</span> argv);
<span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span><span class="operator">::</span>setApplicationVersion(QT_VERSION_STR);
<span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span><span class="operator">::</span>setApplicationName(<span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">"imagegestures"</span>));
<span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span><span class="operator">::</span>setApplicationDisplayName(<span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">"Image Gestures Example"</span>));
<span class="type"><a href="../qtcore/qcommandlineparser.html">QCommandLineParser</a></span> commandLineParser;
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qcommandlineoption.html">QCommandLineOption</a></span> disablePanOption(<span class="string">"no-pan"</span><span class="operator">,</span> <span class="string">"Disable pan gesture"</span>);
commandLineParser<span class="operator">.</span>addOption(disablePanOption);
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qcommandlineoption.html">QCommandLineOption</a></span> disablePinchOption(<span class="string">"no-pinch"</span><span class="operator">,</span> <span class="string">"Disable pinch gesture"</span>);
commandLineParser<span class="operator">.</span>addOption(disablePinchOption);
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qcommandlineoption.html">QCommandLineOption</a></span> disableSwipeOption(<span class="string">"no-swipe"</span><span class="operator">,</span> <span class="string">"Disable swipe gesture"</span>);
commandLineParser<span class="operator">.</span>addOption(disableSwipeOption);
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qcommandlineoption.html">QCommandLineOption</a></span> helpOption <span class="operator">=</span> commandLineParser<span class="operator">.</span>addHelpOption();
commandLineParser<span class="operator">.</span>addPositionalArgument(<span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">"Directory"</span>)<span class="operator">,</span>
<span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">"Directory to display"</span>));
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> description <span class="operator">=</span> <span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span><span class="operator">::</span>applicationDisplayName()
<span class="operator">+</span> QLatin1String(<span class="string">"\n\nEnable \"debug\" on the logging category \"qt.examples.imagegestures\" in order to\n"</span>
<span class="string">"in order to obtain verbose information about Qt's gesture event processing,\n"</span>
<span class="string">"for example by setting the environment variables QT_LOGGING_RULES to\n"</span>
<span class="string">"qt.examples.imagegestures.debug=true\n"</span>);
commandLineParser<span class="operator">.</span>setApplicationDescription(description);
commandLineParser<span class="operator">.</span>process(<span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span><span class="operator">::</span>arguments());
<span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> arguments <span class="operator">=</span> commandLineParser<span class="operator">.</span>positionalArguments();
<span class="keyword">if</span> (<span class="operator">!</span>arguments<span class="operator">.</span>isEmpty() <span class="operator">&</span><span class="operator">&</span> <span class="operator">!</span><span class="type"><a href="../qtcore/qfileinfo.html">QFileInfo</a></span>(arguments<span class="operator">.</span>front())<span class="operator">.</span>isDir()) {
showHelp(commandLineParser<span class="operator">,</span>
QLatin1Char(<span class="char">'"'</span>) <span class="operator">+</span> <span class="type"><a href="../qtcore/qdir.html">QDir</a></span><span class="operator">::</span>toNativeSeparators(arguments<span class="operator">.</span>front())
<span class="operator">+</span> <span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">"\" is not a directory."</span>));
<span class="keyword">return</span> <span class="operator">-</span><span class="number">1</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> gestures;
<span class="keyword">if</span> (<span class="operator">!</span>commandLineParser<span class="operator">.</span>isSet(disablePanOption))
gestures <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>PanGesture;
<span class="keyword">if</span> (<span class="operator">!</span>commandLineParser<span class="operator">.</span>isSet(disablePinchOption))
gestures <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>PinchGesture;
<span class="keyword">if</span> (<span class="operator">!</span>commandLineParser<span class="operator">.</span>isSet(disableSwipeOption))
gestures <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>SwipeGesture;
MainWidget w;
w<span class="operator">.</span>grabGestures(gestures);
w<span class="operator">.</span>show();
<span class="keyword">if</span> (arguments<span class="operator">.</span>isEmpty()) {
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> picturesLocations <span class="operator">=</span> <span class="type"><a href="../qtcore/qstandardpaths.html">QStandardPaths</a></span><span class="operator">::</span>standardLocations(<span class="type"><a href="../qtcore/qstandardpaths.html">QStandardPaths</a></span><span class="operator">::</span>PicturesLocation);
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> directory <span class="operator">=</span>
<span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getExistingDirectory(<span class="operator">&</span>w<span class="operator">,</span> <span class="string">"Select image folder"</span><span class="operator">,</span>
picturesLocations<span class="operator">.</span>isEmpty() <span class="operator">?</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>() : picturesLocations<span class="operator">.</span>front());
<span class="keyword">if</span> (directory<span class="operator">.</span>isEmpty())
<span class="keyword">return</span> <span class="number">0</span>;
arguments<span class="operator">.</span>append(directory);
}
w<span class="operator">.</span>openDirectory(arguments<span class="operator">.</span>front());
<span class="keyword">return</span> app<span class="operator">.</span>exec();
}
</pre>
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<!-- @@@gestures/imagegestures/main.cpp -->
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