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Qt 5.2.1 Reference Documentation</li>
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<li class="level1"><a href="#active-qt-module">Active Qt Module</a></li>
<li class="level1"><a href="#qt-concurrent-module">Qt Concurrent Module</a></li>
<li class="level1"><a href="#qt-declarative-module">Qt Declarative Module</a></li>
<li class="level1"><a href="#qt-graphical-effects-module">Qt Graphical Effects Module</a></li>
<li class="level1"><a href="#qt-image-formats-module">Qt Image Formats Module</a></li>
<li class="level1"><a href="#qt-opengl-module">Qt OpenGL Module</a></li>
<li class="level1"><a href="#qt-print-support-module">Qt Print Support Module</a></li>
<li class="level1"><a href="#qt-script-module">Qt Script Module</a></li>
<li class="level1"><a href="#qt-svg-module">Qt SVG Module</a></li>
<li class="level1"><a href="#qt-tools-module">Qt Tools Module</a></li>
<li class="level1"><a href="#qt-xml-module">Qt XML Module</a></li>
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<h1 class="title">Add-ons</h1>
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<p>In addition to the essential Qt modules which are supported on all the platforms supported by Qt, there is also a set of add-on modules. Platform support for these modules is optional, but many are still widely supported. Note that, though the modules are considered optional, they are not necessarily less important than the essential Qt modules. Some are deprecated APIs available for backwards compatibility, but others are fundamental modules which may primarily be relevant on a sub-set of the platforms supported by Qt.</p>
<p>The following are the add-on modules available in the Qt SDK.</p>
<a name="active-qt-module"></a>
<h2>Active Qt Module</h2>
<p>The Active Qt module provides support for ActiveX and COM on Windows platforms.</p>
<a name="qt-concurrent-module"></a>
<h2>Qt Concurrent Module</h2>
<p>The <a href="../qtconcurrent/qtconcurrent-index.html">Qt Concurrent</a> module provides APIs to make it simpler and safer to write multi-threaded code in a structured manner, enabling your application to better exploit the hardware resources of the platform where it is running.</p>
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<li><a href="thread-basics.html">Threading Basics</a></li>
<li>Thread Support</li>
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<a name="qt-declarative"></a><a name="qt-declarative-module"></a>
<h2>Qt Declarative Module</h2>
<p>The Qt Declarative module provides APIs and tools to support code written in Qt Quick 1. For more information, visit the <a href="qtquick-porting-qt5.html#qt-quick-1">Qt Quick 1</a> page.</p>
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<h2>Qt Graphical Effects Module</h2>
<p>The <a href="../qtgraphicaleffects/qtgraphicaleffects-index.html">Qt Graphical Effects</a> module is an extension to <a href="../qtquick/qtquick-index.html">Qt Quick</a> which provides a ready-made set of shader effects to be used in QML. The module provides graphical effects such as blurring, colorization, drop shadows, and more.</p>
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<h2>Qt Image Formats Module</h2>
<p>The Qt Image Formats module contains plugins that provide support for an extended set of image formats to Qt applications.</p>
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<h2>Qt OpenGL Module</h2>
<p>The <a href="../qtopengl/qtopengl-index.html">Qt OpenGL</a> module is primarily provided for compatibility with Qt 4. The essential <a href="../qtgui/qtgui-index.html">Qt GUI</a> module provides a set of <a href="../qtopengl/opengl-module.html">OpenGL</a> classes which cover most use cases where you want to mix Qt and <a href="../qtopengl/opengl-module.html">OpenGL</a>-based code.</p>
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<h2>Qt Print Support Module</h2>
<p>The <a href="../qtprintsupport/qtprintsupport-index.html">Qt Print Support</a> module provides cross-platform APIs to make printing easy and portable. Printing with Qt is done by using the same <a href="../qtgui/qpainter.html">QPainter</a> APIs which can also be used to paint on screen or on a <a href="../qtgui/qimage.html">QImage</a>.</p>
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<h2>Qt Script Module</h2>
<p>The <a href="../qtscript/qtscript-index.html">Qt Script</a> module provides APIs to <a href="../qtqml/qtjavascript.html">make Qt applications scriptable</a>. This module is primarily provided for compatibility with Qt 4, and to support applications that use the <a href="#qt-declarative">Qt Declarative</a> module. An alternative API is provided by <a href="../qtqml/qjsengine.html">QJSEngine</a> from the essential <a href="../qtqml/qtqml-index.html">Qt QML</a> module.</p>
<p>For more information, see <a href="../qtscript/script.html">Scripting Classes and Overviews</a>.</p>
<a name="qt-svg-module"></a>
<h2>Qt SVG Module</h2>
<p>Scalable Vector Graphics, or "SVG", is an XML-based format for storing vector-based graphics. The <a href="../qtsvg/qtsvg-index.html">Qt SVG</a> module provides APIs to render and save files in the SVG format, and supports a subset of the SVG 1.2 Tiny standard.</p>
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<h2>Qt Tools Module</h2>
<p>The <a href="qtmodules.html#qt-tools">Qt Tools</a> module provides APIs related to the specific tools provided to make development with Qt easier. In particular there is the <a href="../qtuitools/qtuitools-index.html">Qt UI Tools</a> module which provides classes to handle the forms created in Qt Designer and the <a href="../qthelp/qthelp-index.html">Qt Help</a> module which can be used to integrate online documentation in applications, similar to Qt Assistant.</p>
<a name="qt-xml-module"></a>
<h2>Qt XML Module</h2>
<p>The <a href="../qtxml/qtxml-index.html">Qt XML</a> Module is provided for compatibility with older code. It has been superseded by the <a href="../qtcore/qxmlstreamreader.html">QXmlStreamReader</a> and <a href="../qtcore/qxmlstreamwriter.html">QXmlStreamWriter</a> classes in the <a href="../qtcore/qtcore-index.html">Qt Core</a> module.</p>
<p>For more information, read the section "XML Support in Qt" in the <a href="topics-data-storage.html">Data Storage</a> overview.</p>
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