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<?xml version="1.0" encoding="UTF-8"?>
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<td >Qt 5.9</td><td ><a href="qtquickcontrols2-index.html">Qt Quick Controls 2</a></td><td >Getting Started with Qt Quick Controls 2</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.5 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
<ul>
<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 Quick Controls 2</h1>
<span class="subtitle"></span>
<!-- $$$qtquickcontrols2-gettingstarted.html-description -->
<div class="descr"> <a name="details"></a>
<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 QtQuick.Controls 2.1

  <span class="type"><a href="qml-qtquick-controls2-applicationwindow.html">ApplicationWindow</a></span> {
      <span class="name">title</span>: <span class="string">&quot;My Application&quot;</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-qtquick-controls2-button.html">Button</a></span> {
          <span class="name">text</span>: <span class="string">&quot;Push Me&quot;</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 <a href="../qtquick/qquickview.html">QQuickView</a> 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 Quick Controls 2, declare an <a href="qml-qtquick-controls2-applicationwindow.html">ApplicationWindow</a> as the root item of your application and launch it by using <a href="../qtqml/qqmlapplicationengine.html">QQmlApplicationEngine</a> 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 &lt;QGuiApplication&gt;</span>
  <span class="preprocessor">#include &lt;QQmlApplicationEngine&gt;</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"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span><span class="operator">::</span>setAttribute(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AA_EnableHighDpiScaling);
      <span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span> app(argc<span class="operator">,</span> argv);
      <span class="type"><a href="../qtqml/qqmlapplicationengine.html">QQmlApplicationEngine</a></span> engine;
      engine<span class="operator">.</span>load(<span class="type"><a href="../qtcore/qurl.html">QUrl</a></span>(<span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">&quot;qrc:/main.qml&quot;</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 <a href="../qtqml/qqmlengine.html#qmlRegisterType">qmlRegisterType</a>() before declaring your <a href="../qtqml/qqmlapplicationengine.html">QQmlApplicationEngine</a>. See <a href="../qtqml/qtqml-cppintegration-overview.html#defining-qml-types-from-c">Defining QML Types from C++</a> 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 <a href="../qtqml/qqmlcontext.html">QQmlContext</a> for more information.</p>
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