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<td >Qt 5.7</td><td ><a href="qtquickcontrols2-index.html">Qt Quick Controls 2</a></td><td >High-DPI Support in Qt Quick Controls 2</td></tr></table><table class="buildversion"><tr>
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<h1 class="title">High-DPI Support in Qt Quick Controls 2</h1>
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<p>Qt Quick Controls 2 support Qt's cross-platform high-DPI scaling introduced in Qt 5.6. The feature is opt-in, and can be enabled by setting the <code>Qt::AA_EnableHighDpiScaling</code> application attribute in C++ before <a href="../qtgui/qguiapplication.html">QGuiApplication</a> is constructed:</p>
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<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="comment">// <--</span>
<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"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">"qrc:/main.qml"</span>)));
<span class="keyword">return</span> app<span class="operator">.</span>exec();
}
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<p>Alternatively, an environment variable <code>QT_AUTO_SCREEN_SCALE_FACTOR=1</code> can be set to enable automatic high-DPI scaling.</p>
<p><b>Warning:</b> Qt Quick Controls 1.x are not compatible with Qt's automatic high-DPI scaling. There is currently no available solution for high-DPI support in applications wishing to mix Qt Quick Controls and Qt Quick Controls 2.</p>
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<h2 id="related-information">Related Information</h2>
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<li>High DPI Displays</li>
<li>Scalability</li>
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