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<td >Qt 5.6</td><td ><a href="qtlabscontrols-index.html">Qt Labs Controls</a></td><td >Getting Started with Qt Labs Controls</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.6.2 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#setting-up-controls-from-c">Setting Up Controls from C++</a></li>
<li class="level2"><a href="#using-c-data-from-qml">Using C++ Data From QML</a></li>
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<h1 class="title">Getting Started with Qt Labs Controls</h1>
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<p>A basic example of a QML file that makes use of controls is shown here:</p>
<pre class="qml">
import QtQuick 2.6
import Qt.labs.controls 1.0
<span class="type"><a href="qml-qt-labs-controls-applicationwindow.html">ApplicationWindow</a></span> {
<span class="name">title</span>: <span class="string">"My Application"</span>
<span class="name">width</span>: <span class="number">640</span>
<span class="name">height</span>: <span class="number">480</span>
<span class="name">visible</span>: <span class="number">true</span>
<span class="type"><a href="qml-qt-labs-controls-button.html">Button</a></span> {
<span class="name">text</span>: <span class="string">"Push Me"</span>
<span class="name">anchors</span>.centerIn: <span class="name">parent</span>
}
}
</pre>
<a name="setting-up-controls-from-c"></a>
<h2 id="setting-up-controls-from-c">Setting Up Controls from C++</h2>
<p>Although QQuickView has traditionally been used to display QML files in a C++ application, doing this means you can only set window properties from C++.</p>
<p>With Qt Labs Controls, declare an <a href="qml-qt-labs-controls-applicationwindow.html">ApplicationWindow</a> as the root item of your application and launch it by using QQmlApplicationEngine instead. This ensures that you can control top level window properties from QML.</p>
<p>A basic example of a source file that makes use of controls is shown here:</p>
<pre class="cpp">
<span class="preprocessor">#include <QGuiApplication></span>
<span class="preprocessor">#include <QQmlApplicationEngine></span>
<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">QGuiApplication</span><span class="operator">::</span>setAttribute(<span class="type">Qt</span><span class="operator">::</span>AA_EnableHighDpiScaling);
<span class="type">QGuiApplication</span> app(argc<span class="operator">,</span> argv);
<span class="type">QQmlApplicationEngine</span> engine;
engine<span class="operator">.</span>load(<span class="type">QUrl</span>(<span class="type">QStringLiteral</span>(<span class="string">"qrc:/main.qml"</span>)));
<span class="keyword">return</span> app<span class="operator">.</span>exec();
}
</pre>
<a name="using-c-data-from-qml"></a>
<h3 >Using C++ Data From QML</h3>
<p>If you need to register a C++ class to use from QML, you can call qmlRegisterType() before declaring your QQmlApplicationEngine. See Defining QML Types from C++ for more information.</p>
<p>If you need to expose data to QML components, you need to make them available to the context of the current QML engine. See QQmlContext for more information.</p>
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