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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en_US" lang="en_US">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- qstyleplugin.cpp -->
<title>Qt 4.8: QStylePlugin Class Reference</title>
<link rel="stylesheet" type="text/css" href="style/offline.css" />
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<div class="header" id="qtdocheader">
<div class="content">
<a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
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<li class="first"><a href="index.html">Home</a></li>
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<li><a href="modules.html">Modules</a></li>
<li><a href="qtgui.html">QtGui</a></li>
<li>QStylePlugin</li>
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<div class="content mainContent">
<div class="toc">
<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
</ul>
</div>
<h1 class="title">QStylePlugin Class Reference</h1>
<!-- $$$QStylePlugin-brief -->
<p>The QStylePlugin class provides an abstract base for custom <a href="qstyle.html">QStyle</a> plugins. <a href="#details">More...</a></p>
<!-- @@@QStylePlugin -->
<pre class="cpp"> <span class="preprocessor">#include <QStylePlugin></span></pre><p><b>Inherits: </b><a href="qobject.html">QObject</a>.</p>
<ul>
<li><a href="qstyleplugin-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qstyleplugin.html#QStylePlugin">QStylePlugin</a></b> ( QObject * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qstyleplugin.html#dtor.QStylePlugin">~QStylePlugin</a></b> ()</td></tr>
</table>
<a name="reimplemented-public-functions"></a>
<h2>Reimplemented Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual QStyle * </td><td class="memItemRight bottomAlign"><b><a href="qstyleplugin.html#create">create</a></b> ( const QString & <i>key</i> ) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QStringList </td><td class="memItemRight bottomAlign"><b><a href="qstyleplugin.html#keys">keys</a></b> () const = 0</td></tr>
</table>
<ul>
<li class="fn">29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
</ul>
<h3>Additional Inherited Members</h3>
<ul>
<li class="fn">1 property inherited from <a href="qobject.html#properties">QObject</a></li>
<li class="fn">1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
<li class="fn">1 signal inherited from <a href="qobject.html#signals">QObject</a></li>
<li class="fn">7 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>
<li class="fn">8 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
</ul>
<a name="details"></a>
<!-- $$$QStylePlugin-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QStylePlugin class provides an abstract base for custom <a href="qstyle.html">QStyle</a> plugins.</p>
<p>QStylePlugin is a simple plugin interface that makes it easy to create custom styles that can be loaded dynamically into applications using the <a href="qstylefactory.html">QStyleFactory</a> class.</p>
<p>Writing a style plugin is achieved by subclassing this base class, reimplementing the pure virtual <a href="qstyleplugin.html#keys">keys</a>() and <a href="qstyleplugin.html#create">create</a>() functions, and exporting the class using the <a href="qtplugin.html#Q_EXPORT_PLUGIN2">Q_EXPORT_PLUGIN2</a>() macro. See <a href="plugins-howto.html">How to Create Qt Plugins</a> for details.</p>
</div>
<p><b>See also </b><a href="qstylefactory.html">QStyleFactory</a> and <a href="qstyle.html">QStyle</a>.</p>
<!-- @@@QStylePlugin -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QStylePlugin[overload1]$$$QStylePluginQObject* -->
<h3 class="fn"><a name="QStylePlugin"></a>QStylePlugin::<span class="name">QStylePlugin</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>parent</i> = 0 )</h3>
<p>Constructs a style plugin with the given <i>parent</i>.</p>
<p>Note that this constructor is invoked automatically by the <a href="qtplugin.html#Q_EXPORT_PLUGIN2">Q_EXPORT_PLUGIN2</a>() macro, so there is no need for calling it explicitly.</p>
<!-- @@@QStylePlugin -->
<!-- $$$~QStylePlugin[overload1]$$$~QStylePlugin -->
<h3 class="fn"><a name="dtor.QStylePlugin"></a>QStylePlugin::<span class="name">~QStylePlugin</span> ()</h3>
<p>Destroys the style plugin.</p>
<p>Note that Qt destroys a plugin automatically when it is no longer used, so there is no need for calling the destructor explicitly.</p>
<!-- @@@~QStylePlugin -->
<!-- $$$create[overload1]$$$createconstQString& -->
<h3 class="fn"><a name="create"></a><span class="type"><a href="qstyle.html">QStyle</a></span> * QStylePlugin::<span class="name">create</span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>key</i> )<tt> [pure virtual]</tt></h3>
<p>Creates and returns a <a href="qstyle.html">QStyle</a> object for the given style <i>key</i>. If a plugin cannot create a style, it should return 0 instead.</p>
<p>The style key is usually the class name of the required style. Note that the keys are case insensitive. For example:</p>
<pre class="cpp"> <span class="type"><a href="qstringlist.html">QStringList</a></span> MyStylePlugin<span class="operator">::</span><a href="qstyleplugin.html#keys">keys</a>() <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="type"><a href="qstringlist.html">QStringList</a></span>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Rocket"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"StarBuster"</span>;
}
<span class="type"><a href="qstyle.html">QStyle</a></span> <span class="operator">*</span>MyStylePlugin<span class="operator">::</span>create(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>key)
{
<span class="type"><a href="qstring.html">QString</a></span> lcKey <span class="operator">=</span> key;
<span class="keyword">if</span> (lcKey <span class="operator">=</span><span class="operator">=</span> <span class="string">"rocket"</span>) {
<span class="keyword">return</span> <span class="keyword">new</span> RocketStyle;
} <span class="keyword">else</span> <span class="keyword">if</span> (lcKey <span class="operator">=</span><span class="operator">=</span> <span class="string">"starbuster"</span>) {
<span class="keyword">return</span> <span class="keyword">new</span> StarBusterStyle;
}
<span class="keyword">return</span> <span class="number">0</span>;
}</pre>
<p><b>See also </b><a href="qstyleplugin.html#keys">keys</a>().</p>
<!-- @@@create -->
<!-- $$$keys[overload1]$$$keys -->
<h3 class="fn"><a name="keys"></a><span class="type"><a href="qstringlist.html">QStringList</a></span> QStylePlugin::<span class="name">keys</span> () const<tt> [pure virtual]</tt></h3>
<p>Returns the list of style keys this plugin supports.</p>
<p>These keys are usually the class names of the custom styles that are implemented in the plugin.</p>
<p><b>See also </b><a href="qstyleplugin.html#create">create</a>().</p>
<!-- @@@keys -->
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