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<td >Qt 5.9</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-module.html">C++ Classes</a></td><td >QStyleOptionGraphicsItem</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-types">Public Types</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#public-variables">Public Variables</a></li>
<li class="level1"><a href="#static-public-members">Static Public Members</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QStyleOptionGraphicsItem Class</h1>
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<p>The <a href="qstyleoptiongraphicsitem.html">QStyleOptionGraphicsItem</a> class is used to describe the parameters needed to draw a <a href="qgraphicsitem.html">QGraphicsItem</a>. <a href="#details">More...</a></p>
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QStyleOptionGraphicsItem></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += widgets</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 4.2</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qstyleoption.html">QStyleOption</a></td></tr></table></div><ul>
<li><a href="qstyleoptiongraphicsitem-members.html">List of all members, including inherited members</a></li>
<li><a href="qstyleoptiongraphicsitem-obsolete.html">Obsolete members</a></li>
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<h2 id="public-types">Public Types</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> enum </td><td class="memItemRight bottomAlign"><b><a href="qstyleoptiongraphicsitem.html#StyleOptionType-enum">StyleOptionType</a></b> { Type }</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> enum </td><td class="memItemRight bottomAlign"><b><a href="qstyleoptiongraphicsitem.html#StyleOptionVersion-enum">StyleOptionVersion</a></b> { Version }</td></tr>
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<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qstyleoptiongraphicsitem.html#QStyleOptionGraphicsItem">QStyleOptionGraphicsItem</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qstyleoptiongraphicsitem.html#QStyleOptionGraphicsItem-1">QStyleOptionGraphicsItem</a></b>(const QStyleOptionGraphicsItem &<i>other</i>)</td></tr>
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<li class="fn">2 public functions inherited from <a href="qstyleoption.html#public-functions">QStyleOption</a></li>
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<h2 id="public-variables">Public Variables</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> QRectF </td><td class="memItemRight bottomAlign"><b><a href="qstyleoptiongraphicsitem.html#exposedRect-var">exposedRect</a></b></td></tr>
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<li class="fn">8 public variables inherited from <a href="qstyleoption.html#public-variables">QStyleOption</a></li>
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<h2 id="static-public-members">Static Public Members</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> qreal </td><td class="memItemRight bottomAlign"><b><a href="qstyleoptiongraphicsitem.html#levelOfDetailFromTransform">levelOfDetailFromTransform</a></b>(const QTransform &<i>worldTransform</i>)</td></tr>
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<h2 id="details">Detailed Description</h2>
<p>The <a href="qstyleoptiongraphicsitem.html">QStyleOptionGraphicsItem</a> class is used to describe the parameters needed to draw a <a href="qgraphicsitem.html">QGraphicsItem</a>.</p>
<p>For performance reasons, the access to the member variables is direct (i.e., using the <code>.</code> or <code>-></code> operator). This low-level feel makes the structures straightforward to use and emphasizes that these are simply parameters.</p>
<p>For an example demonstrating how style options can be used, see the <a href="qtwidgets-widgets-styles-example.html">Styles</a> example.</p>
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<p><b>See also </b><a href="qstyleoption.html">QStyleOption</a> and <a href="qgraphicsitem.html#paint">QGraphicsItem::paint</a>().</p>
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<div class="types">
<h2>Member Type Documentation</h2>
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<h3 class="fn" id="StyleOptionType-enum"><a name="StyleOptionType-enum"></a>enum QStyleOptionGraphicsItem::<span class="name">StyleOptionType</span></h3>
<p>This enum is used to hold information about the type of the style option, and is defined for each <a href="qstyleoption.html">QStyleOption</a> subclass.</p>
<div class="table"><table class="valuelist"><tr valign="top" class="odd"><th class="tblConst">Constant</th><th class="tblval">Value</th><th class="tbldscr">Description</th></tr>
<tr><td class="topAlign"><code>QStyleOptionGraphicsItem::Type</code></td><td class="topAlign tblval"><code>SO_GraphicsItem</code></td><td class="topAlign">The type of style option provided (<a href="qstyleoption.html#OptionType-enum">SO_GraphicsItem</a> for this class).</td></tr>
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<p>The type is used internally by <a href="qstyleoption.html">QStyleOption</a>, its subclasses, and <a href="qstyleoption.html#qstyleoption_cast">qstyleoption_cast</a>() to determine the type of style option. In general you do not need to worry about this unless you want to create your own <a href="qstyleoption.html">QStyleOption</a> subclass and your own styles.</p>
<p><b>See also </b><a href="qstyleoptiongraphicsitem.html#StyleOptionVersion-enum">StyleOptionVersion</a>.</p>
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<h3 class="fn" id="StyleOptionVersion-enum"><a name="StyleOptionVersion-enum"></a>enum QStyleOptionGraphicsItem::<span class="name">StyleOptionVersion</span></h3>
<p>This enum is used to hold information about the version of the style option, and is defined for each <a href="qstyleoption.html">QStyleOption</a> subclass.</p>
<div class="table"><table class="valuelist"><tr valign="top" class="odd"><th class="tblConst">Constant</th><th class="tblval">Value</th><th class="tbldscr">Description</th></tr>
<tr><td class="topAlign"><code>QStyleOptionGraphicsItem::Version</code></td><td class="topAlign tblval"><code>1</code></td><td class="topAlign">1</td></tr>
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<p>The version is used by <a href="qstyleoption.html">QStyleOption</a> subclasses to implement extensions without breaking compatibility. If you use <a href="qstyleoption.html#qstyleoption_cast">qstyleoption_cast</a>(), you normally do not need to check it.</p>
<p><b>See also </b><a href="qstyleoptiongraphicsitem.html#StyleOptionType-enum">StyleOptionType</a>.</p>
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<div class="func">
<h2>Member Function Documentation</h2>
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<h3 class="fn" id="QStyleOptionGraphicsItem"><a name="QStyleOptionGraphicsItem"></a>QStyleOptionGraphicsItem::<span class="name">QStyleOptionGraphicsItem</span>()</h3>
<p>Constructs a <a href="qstyleoptiongraphicsitem.html">QStyleOptionGraphicsItem</a>.</p>
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<h3 class="fn" id="QStyleOptionGraphicsItem-1"><a name="QStyleOptionGraphicsItem-1"></a>QStyleOptionGraphicsItem::<span class="name">QStyleOptionGraphicsItem</span>(const <span class="type"><a href="qstyleoptiongraphicsitem.html#QStyleOptionGraphicsItem">QStyleOptionGraphicsItem</a></span> &<i>other</i>)</h3>
<p>Constructs a copy of <i>other</i>.</p>
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<h3 class="fn" id="levelOfDetailFromTransform"><a name="levelOfDetailFromTransform"></a><code>[static] </code><span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> QStyleOptionGraphicsItem::<span class="name">levelOfDetailFromTransform</span>(const <span class="type"><a href="../qtgui/qtransform.html">QTransform</a></span> &<i>worldTransform</i>)</h3>
<p>Returns the level of detail from the <i>worldTransform</i>.</p>
<p>Its value represents the maximum value of the height and width of a unity rectangle, mapped using the <i>worldTransform</i> of the painter used to draw the item. By default, if no transformations are applied, its value is 1. If zoomed out 1:2, the level of detail will be 0.5, and if zoomed in 2:1, its value is 2.</p>
<p>This function was introduced in Qt 4.6.</p>
<p><b>See also </b><a href="qgraphicsscene.html#minimumRenderSize-prop">QGraphicsScene::minimumRenderSize</a>().</p>
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<div class="vars">
<h2>Member Variable Documentation</h2>
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<h3 class="fn" id="exposedRect-var"><a name="exposedRect-var"></a><span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> QStyleOptionGraphicsItem::<span class="name">exposedRect</span></h3>
<p>This variable holds the exposed rectangle, in item coordinates</p>
<p>Make use of this rectangle to speed up item drawing when only parts of the item are exposed. If the whole item is exposed, this rectangle will be the same as <a href="qgraphicsitem.html#boundingRect">QGraphicsItem::boundingRect</a>().</p>
<p>This member is only initialized for items that have the <a href="qgraphicsitem.html#GraphicsItemFlag-enum">QGraphicsItem::ItemUsesExtendedStyleOption</a> flag set.</p>
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