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<td >Qt 5.9</td><td ><a href="qtgui-index.html">Qt GUI</a></td><td ><a href="qtgui-module.html">C++ Classes</a></td><td >Key</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-functions">Public Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">Key Class</h1>
<span class="small-subtitle">(<a href="qpixmapcache-key.html">QPixmapCache::Key</a>)<br/></span>
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<p>The <a href="qpixmapcache-key.html">QPixmapCache::Key</a> class can be used for efficient access to the <a href="qpixmapcache.html">QPixmapCache</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 <Key></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += gui</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 4.6</td></tr></table></div><ul>
<li><a href="qpixmapcache-key-members.html">List of all members, including inherited members</a></li>
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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="qpixmapcache-key.html#Key">Key</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qpixmapcache-key.html#dtor.Key">~Key</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpixmapcache-key.html#isValid">isValid</a></b>() const</td></tr>
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<h2 id="details">Detailed Description</h2>
<p>The <a href="qpixmapcache-key.html">QPixmapCache::Key</a> class can be used for efficient access to the <a href="qpixmapcache.html">QPixmapCache</a>.</p>
<p>Use <a href="qpixmapcache.html#insert">QPixmapCache::insert</a>() to receive an instance of Key generated by the pixmap cache. You can store the key in your own objects for a very efficient one-to-one object-to-pixmap mapping.</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn" id="Key"><a name="Key"></a>Key::<span class="name">Key</span>()</h3>
<p>Constructs an empty Key object.</p>
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<h3 class="fn" id="dtor.Key"><a name="dtor.Key"></a>Key::<span class="name">~Key</span>()</h3>
<p>Destroys the key.</p>
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<h3 class="fn" id="isValid"><a name="isValid"></a><span class="type">bool</span> Key::<span class="name">isValid</span>() const</h3>
<p>Returns <code>true</code> if there is a cached pixmap associated with this key. Otherwise, if pixmap was flushed, the key is no longer valid.</p>
<p>This function was introduced in Qt 5.7.</p>
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