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<h1 class="title">Porting QML Applications to Qt 5 Example</h1>
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<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>
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