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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#qt-activeqt-module">Qt ActiveQt 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="qt-activeqt-module"></a>
<h2>Qt ActiveQt Module</h2>
<p>The Qt ActiveQt Module provides support for ActiveX and COM on Windows platforms.</p>
<a name="qt-concurrent-module"></a>
<h2>Qt Concurrent Module</h2>
<p>The Qt Concurrent 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>
<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.</p>
<a name="qt-graphical-effects-module"></a>
<h2>Qt Graphical Effects Module</h2>
<p>The Qt Graphical Effects Module is an extension to QtQuick 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>
<a name="qt-image-formats-module"></a>
<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>
<a name="qt-opengl-module"></a>
<h2>Qt OpenGL Module</h2>
<p>The Qt OpenGL Module is primarily provided for compatibility with Qt 4. The essential <a href="whatsnew51.html#qt-gui">Qt Gui</a> Module provides a set of OpenGL classes which cover most use cases where you want to mix Qt- and OpenGL-based code.</p>
<a name="qt-print-support-module"></a>
<h2>Qt Print Support Module</h2>
<p>The Qt Print Support Module provides cross-platform APIs to make printing easy and portable. Printing with Qt is done by using the same QPainter APIs which can also be used to paint on screen or on a QImage.</p>
<a name="qt-script-module"></a>
<h2>Qt Script Module</h2>
<p>The Qt Script Module provides APIs to make Qt applications scriptable. This module is primarily provided for compatibility with Qt 4, and to support applications that use the Qt Declarative Module. An alternative API is provided by the essential <a href="whatsnew51.html#qt-qml">Qt Qml</a> Module. For more information, see the list of QtScript APIs, or learn how to make your own extensions to <a href="topics-scripting.html#qtscript">QtScript</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 Qt SVG Module provides APIs to render and save files in the SVG format, and supports a subset of the SVG 1.2 Tiny standard.</p>
<a name="qt-tools-module"></a>
<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 Qt UI Tools Module which provides classes to handle the forms created in Qt Designer and the Qt Help 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 Qt XML Module is provided for compatibility with older code. It has been superseded by the QXMLStreamReader and QXMLStreamWriter classes in the <a href="whatsnew51.html#qt-core">Qt Core</a> Module.</p>
<p>For more information, read the section "XML Support in Qt" in the Data Structure and Storage overview.</p>
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