<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- portingqmlapp.qdoc --> <title>Porting QML Applications to Qt 5 Example | Qt 5.9</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="index.html">Qt 5.9</a></td><td >Porting QML Applications to Qt 5 Example</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"> <div class="toc"> <h3><a name="toc">Contents</a></h3> <ul> <li class="level1"><a href="#related-topics">Related Topics</a></li> </ul> </div> <div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">Porting QML Applications to Qt 5 Example</h1> <span class="subtitle"></span> <!-- $$$portingqmlapp.html-description --> <div class="descr"> <a name="details"></a> <p>The new version of Qt Quick in Qt 5 brings in some changes to the way QML applications are developed. For the complete list of changes that affect existing QML applications, refer to <a href="qtquick-porting-qt5.html">Porting QML Applications to Qt 5</a>.</p> <p>This topic will walk through the porting process to make the <code>flickr</code> Qt 4 QML demo work on Qt 5. If you have the SDK based on Qt 4.8 installed, you can find this demo application under <code><install_dir_root>/Examples/4.x/declarative/demos/</code>.</p> <p>Follow these step-by-step instructions to port the <i>flickr</i> Qt 4 QML application work to Qt 5:</p> <ol class="1" type="1"><li>Open the <i>flickr</i> project using Qt Creator.</li> <li>Edit all the <code>.qml</code> files and replace the <code>import QtQuick 1.0</code> statements with <code>import QtQuick 2.3</code>.</li> <li>Add the additional <code>import QtQuick.XmlListModel 2.0</code> statement to <code>qml/common/RssModel.qml</code>.<p><b>Note: </b>XmlListModel is part of a submodule under <code>QtQuick</code> and it must be imported explicitly in order to use it.</p></li> <li>Make the following changes to <code>qmlapplicationviewer/qmlapplicationviewer.h</code>:<ul> <li>Replace the <code>#include <QtDeclarative/QDeclarativeView></code> with <code>#include <QQuickView></code>.</li> <li>Replace <code>QDeclarativeView</code> with <code>QQuickView</code> in the class declaration for <code>QmlApplicationViewer</code>.</li> <li>Replace the parameter for <code>QmlApplicationViewer</code> constructor from <code>QWidget</code> to <code>QWindow</code>.</li> </ul> </li> <li>Make the following changes to <code>qmlapplicationviewer/qmlapplicationviewer.cpp</code>:<ul> <li>Replace all the <code>QtCore</code> and <code>QtDeclarative</code> include statements with these:<pre class="cpp"> <span class="preprocessor">#include <QCoreApplication></span> <span class="preprocessor">#include <QDir></span> <span class="preprocessor">#include <QFileInfo></span> <span class="preprocessor">#include <QQmlComponent></span> <span class="preprocessor">#include <QQmlEngine></span> <span class="preprocessor">#include <QQmlContext></span> <span class="preprocessor">#include <QDebug></span> </pre> </li> <li>Replace all instances of <code>QWidget</code> with <code>QWindow</code>, and <code>QDeclarativeView</code> with <code>QQuickView</code>.</li> <li>Remove the code between <code>#if defined(Q_OS_SYMBIAN)</code> and <code>#endif</code> macros as Symbian platform is not supported in Qt 5.</li> <li>Remove the code between <code>#if QT_VERSION < 0x040702</code> and <code>#else</code>, and <code>#endif // QT_VERSION < 0x040702</code> macros towards the end.</li> </ul> </li> <li>Save changes to the project and run the application.</li> </ol> <p>Once you see the application running, check whether it behaves as expected. Here is a snapshot of the application running on Ubuntu v12.04:</p> <p class="centerAlign"><img src="images/flickr_application.png" alt="" /></p><a name="related-topics"></a> <h2 id="related-topics">Related Topics</h2> <p><a href="qtquick-porting-qt5.html">Porting QML Applications to Qt 5</a></p> </div> <!-- @@@portingqmlapp.html --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 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>