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<td >Qt 5.12</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-module.html">C++ Classes</a></td><td >QGraphicsOpacityEffect</td></tr></table><table class="buildversion"><tr>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#public-slots">Public Slots</a></li>
<li class="level1"><a href="#signals">Signals</a></li>
<li class="level1"><a href="#static-public-members">Static Public Members</a></li>
<li class="level1"><a href="#reimplemented-protected-functions">Reimplemented Protected Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QGraphicsOpacityEffect Class</h1>
<!-- $$$QGraphicsOpacityEffect-brief -->
<p>The <a href="qgraphicsopacityeffect.html">QGraphicsOpacityEffect</a> class provides an opacity effect. <a href="#details">More...</a></p>
<!-- @@@QGraphicsOpacityEffect -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign">   <span class="preprocessor">#include &lt;QGraphicsOpacityEffect&gt;</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 4.6</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qgraphicseffect.html">QGraphicsEffect</a></td></tr></table></div><ul>
<li><a href="qgraphicsopacityeffect-members.html">List of all members, including inherited members</a></li>
<li><a href="qgraphicsopacityeffect-obsolete.html">Obsolete members</a></li>
</ul>
<a name="properties"></a>
<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><a href="qgraphicsopacityeffect.html#opacity-prop">opacity</a></b> : qreal</li>
<li class="fn"><b><a href="qgraphicsopacityeffect.html#opacityMask-prop">opacityMask</a></b> : QBrush</li>
</ul>
<ul>
<li class="fn">1 property inherited from <a href="qgraphicseffect.html#properties">QGraphicsEffect</a></li>
<li class="fn">1 property inherited from <a href="../qtcore/qobject.html#properties">QObject</a></li>
</ul>
<a name="public-functions"></a>
<h2 id="public-functions">Public Functions</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsopacityeffect.html#QGraphicsOpacityEffect">QGraphicsOpacityEffect</a></b>(QObject *<i>parent</i> = nullptr)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsopacityeffect.html#dtor.QGraphicsOpacityEffect">~QGraphicsOpacityEffect</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> qreal </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsopacityeffect.html#opacity-prop">opacity</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QBrush </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsopacityeffect.html#opacityMask-prop">opacityMask</a></b>() const</td></tr>
</table></div>
<ul>
<li class="fn">3 public functions inherited from <a href="qgraphicseffect.html#public-functions">QGraphicsEffect</a></li>
<li class="fn">31 public functions inherited from <a href="../qtcore/qobject.html#public-functions">QObject</a></li>
</ul>
<a name="public-slots"></a>
<h2 id="public-slots">Public Slots</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsopacityeffect.html#opacity-prop">setOpacity</a></b>(qreal <i>opacity</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsopacityeffect.html#opacityMask-prop">setOpacityMask</a></b>(const QBrush &amp;<i>mask</i>)</td></tr>
</table></div>
<ul>
<li class="fn">2 public slots inherited from <a href="qgraphicseffect.html#public-slots">QGraphicsEffect</a></li>
<li class="fn">1 public slot inherited from <a href="../qtcore/qobject.html#public-slots">QObject</a></li>
</ul>
<a name="signals"></a>
<h2 id="signals">Signals</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsopacityeffect.html#opacityChanged">opacityChanged</a></b>(qreal <i>opacity</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsopacityeffect.html#opacityMaskChanged">opacityMaskChanged</a></b>(const QBrush &amp;<i>mask</i>)</td></tr>
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<ul>
<li class="fn">1 signal inherited from <a href="qgraphicseffect.html#signals">QGraphicsEffect</a></li>
<li class="fn">2 signals inherited from <a href="../qtcore/qobject.html#signals">QObject</a></li>
</ul>
<a name="static-public-members"></a>
<h2 id="static-public-members">Static Public Members</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> const QMetaObject </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsopacityeffect.html#staticMetaObject-var">staticMetaObject</a></b></td></tr>
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<li class="fn">9 static public members inherited from <a href="../qtcore/qobject.html#static-public-members">QObject</a></li>
</ul>
<a name="reimplemented-protected-functions"></a>
<h2 id="reimplemented-protected-functions">Reimplemented Protected Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsopacityeffect.html#draw">draw</a></b>(QPainter *<i>painter</i>) override</td></tr>
</table></div>
<ul>
<li class="fn">7 protected functions inherited from <a href="qgraphicseffect.html#protected-functions">QGraphicsEffect</a></li>
<li class="fn">9 protected functions inherited from <a href="../qtcore/qobject.html#protected-functions">QObject</a></li>
</ul>
<a name="details"></a>
<!-- $$$QGraphicsOpacityEffect-description -->
<div class="descr">
<h2 id="details">Detailed Description</h2>
<p>The <a href="qgraphicsopacityeffect.html">QGraphicsOpacityEffect</a> class provides an opacity effect.</p>
<p>An opacity effect renders the source with an opacity. This effect is useful for making the source semi-transparent, similar to a fade-in/fade-out sequence. The opacity can be modified using the <a href="qgraphicsopacityeffect.html#opacity-prop">setOpacity</a>() function.</p>
<p>By default, the opacity is 0.7&#x2e;</p>
<p class="centerAlign"><img src="images/graphicseffect-opacity.png" alt="" /></p></div>
<p><b>See also </b><a href="qgraphicsdropshadoweffect.html">QGraphicsDropShadowEffect</a>, <a href="qgraphicsblureffect.html">QGraphicsBlurEffect</a>, and <a href="qgraphicscolorizeeffect.html">QGraphicsColorizeEffect</a>.</p>
<!-- @@@QGraphicsOpacityEffect -->
<div class="prop">
<h2>Property Documentation</h2>
<!-- $$$opacity-prop$$$opacity$$$setOpacityqreal$$$opacityChangedqreal -->
<h3 class="fn" id="opacity-prop"><a name="opacity-prop"></a><span class="name">opacity</span> : <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span></h3>
<p>This property holds the opacity of the effect.</p>
<p>The value should be in the range of 0.0 to 1.0, where 0.0 is fully transparent and 1.0 is fully opaque.</p>
<p>By default, the opacity is 0.7&#x2e;</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> qreal </td><td class="memItemRight bottomAlign"><span class="name"><b>opacity</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setOpacity</b></span>(qreal <i>opacity</i>)</td></tr>
</table></div>
<p><b>Notifier signal:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qgraphicsopacityeffect.html#opacityChanged">opacityChanged</a></b></span>(qreal <i>opacity</i>)</td></tr>
</table></div>
<p><b>See also </b><a href="qgraphicsopacityeffect.html#opacityMask-prop">setOpacityMask</a>().</p>
<!-- @@@opacity -->
<!-- $$$opacityMask-prop$$$opacityMask$$$setOpacityMaskconstQBrush&$$$opacityMaskChangedconstQBrush& -->
<h3 class="fn" id="opacityMask-prop"><a name="opacityMask-prop"></a><span class="name">opacityMask</span> : <span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span></h3>
<p>This property holds the opacity mask of the effect.</p>
<p>An opacity mask allows you apply opacity to portions of an element.</p>
<p>For example:</p>
<pre class="cpp">

  <span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>
  <span class="type"><a href="../qtgui/qlineargradient.html">QLinearGradient</a></span> alphaGradient(rect<span class="operator">.</span>topLeft()<span class="operator">,</span> rect<span class="operator">.</span>bottomLeft());
  alphaGradient<span class="operator">.</span>setColorAt(<span class="number">0.0</span><span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>transparent);
  alphaGradient<span class="operator">.</span>setColorAt(<span class="number">0.5</span><span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>black);
  alphaGradient<span class="operator">.</span>setColorAt(<span class="number">1.0</span><span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>transparent);
  <span class="type"><a href="qgraphicsopacityeffect.html#QGraphicsOpacityEffect">QGraphicsOpacityEffect</a></span> <span class="operator">*</span>effect <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicsopacityeffect.html#QGraphicsOpacityEffect">QGraphicsOpacityEffect</a></span>;
  effect<span class="operator">-</span><span class="operator">&gt;</span>setOpacityMask(alphaGradient);
  <span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>

</pre>
<p>There is no opacity mask by default.</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> QBrush </td><td class="memItemRight bottomAlign"><span class="name"><b>opacityMask</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setOpacityMask</b></span>(const QBrush &amp;<i>mask</i>)</td></tr>
</table></div>
<p><b>Notifier signal:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qgraphicsopacityeffect.html#opacityMaskChanged">opacityMaskChanged</a></b></span>(const QBrush &amp;<i>mask</i>)</td></tr>
</table></div>
<p><b>See also </b><a href="qgraphicsopacityeffect.html#opacity-prop">setOpacity</a>().</p>
<!-- @@@opacityMask -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QGraphicsOpacityEffect[overload1]$$$QGraphicsOpacityEffectQObject* -->
<h3 class="fn" id="QGraphicsOpacityEffect"><a name="QGraphicsOpacityEffect"></a>QGraphicsOpacityEffect::<span class="name">QGraphicsOpacityEffect</span>(<span class="type"><a href="../qtcore/qobject.html#QObject">QObject</a></span> *<i>parent</i> = nullptr)</h3>
<p>Constructs a new <a href="qgraphicsopacityeffect.html">QGraphicsOpacityEffect</a> instance. The <i>parent</i> parameter is passed to <a href="qgraphicseffect.html">QGraphicsEffect</a>'s constructor.</p>
<!-- @@@QGraphicsOpacityEffect -->
<!-- $$$~QGraphicsOpacityEffect[overload1]$$$~QGraphicsOpacityEffect -->
<h3 class="fn" id="dtor.QGraphicsOpacityEffect"><a name="dtor.QGraphicsOpacityEffect"></a><code>[virtual] </code>QGraphicsOpacityEffect::<span class="name">~QGraphicsOpacityEffect</span>()</h3>
<p>Destroys the effect.</p>
<!-- @@@~QGraphicsOpacityEffect -->
<!-- $$$draw[overload1]$$$drawQPainter* -->
<h3 class="fn" id="draw"><a name="draw"></a><code>[override virtual protected] </code><span class="type">void</span> QGraphicsOpacityEffect::<span class="name">draw</span>(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> *<i>painter</i>)</h3>
<p>Reimplemented from <a href="qgraphicseffect.html#draw">QGraphicsEffect::draw</a>().</p>
<!-- @@@draw -->
<!-- $$$opacityChanged -->
<h3 class="fn" id="opacityChanged"><a name="opacityChanged"></a><code>[signal] </code><span class="type">void</span> QGraphicsOpacityEffect::<span class="name">opacityChanged</span>(<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> <i>opacity</i>)</h3>
<p>This signal is emitted whenever the effect's opacity changes. The <i>opacity</i> parameter holds the effect's new opacity.</p>
<p><b>Note:</b> Notifier signal for property <a href="qgraphicsopacityeffect.html#opacity-prop">opacity</a>. </p><!-- @@@opacityChanged -->
<!-- $$$opacityMaskChanged -->
<h3 class="fn" id="opacityMaskChanged"><a name="opacityMaskChanged"></a><code>[signal] </code><span class="type">void</span> QGraphicsOpacityEffect::<span class="name">opacityMaskChanged</span>(const <span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span> &amp;<i>mask</i>)</h3>
<p>This signal is emitted whenever the effect's opacity mask changes. The <i>mask</i> parameter holds the effect's new opacity mask.</p>
<p><b>Note:</b> Notifier signal for property <a href="qgraphicsopacityeffect.html#opacityMask-prop">opacityMask</a>. </p><!-- @@@opacityMaskChanged -->
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