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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 >QPointingDeviceUniqueId</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="#properties">Properties</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#static-public-members">Static Public Members</a></li>
<li class="level1"><a href="#related-non-members">Related Non-Members</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QPointingDeviceUniqueId Class</h1>
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<p><a href="qpointingdeviceuniqueid.html">QPointingDeviceUniqueId</a> identifies a unique object, such as a tagged token or stylus, which is used with a pointing device. <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 &lt;QPointingDeviceUniqueId&gt;</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 5.8</td></tr></table></div><ul>
<li><a href="qpointingdeviceuniqueid-members.html">List of all members, including inherited members</a></li>
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<h2 id="properties">Properties</h2>
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<li class="fn"><b><a href="qpointingdeviceuniqueid.html#numericId-prop">numericId</a></b> : const qint64</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="qpointingdeviceuniqueid.html#QPointingDeviceUniqueId">QPointingDeviceUniqueId</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpointingdeviceuniqueid.html#isValid">isValid</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> qint64 </td><td class="memItemRight bottomAlign"><b><a href="qpointingdeviceuniqueid.html#numericId-prop">numericId</a></b>() const</td></tr>
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<h2 id="static-public-members">Static Public Members</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> QPointingDeviceUniqueId </td><td class="memItemRight bottomAlign"><b><a href="qpointingdeviceuniqueid.html#fromNumericId">fromNumericId</a></b>(qint64 <i>id</i>)</td></tr>
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<h2 id="related-non-members">Related Non-Members</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> uint </td><td class="memItemRight bottomAlign"><b><a href="qpointingdeviceuniqueid.html#qHash">qHash</a></b>(QPointingDeviceUniqueId <i>key</i>, uint <i>seed</i> = 0)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpointingdeviceuniqueid.html#operator-not-eq">operator!=</a></b>(QPointingDeviceUniqueId <i>lhs</i>, QPointingDeviceUniqueId <i>rhs</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpointingdeviceuniqueid.html#operator-eq-eq">operator==</a></b>(QPointingDeviceUniqueId <i>lhs</i>, QPointingDeviceUniqueId <i>rhs</i>)</td></tr>
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<div class="descr">
<h2 id="details">Detailed Description</h2>
<p><a href="qpointingdeviceuniqueid.html">QPointingDeviceUniqueId</a> identifies a unique object, such as a tagged token or stylus, which is used with a pointing device.</p>
<p>QPointingDeviceUniqueIds can be compared for equality, and can be used as keys in a <a href="../qtcore/qhash.html#qhash">QHash</a>. You get access to the numerical ID via <a href="qpointingdeviceuniqueid.html#numericId-prop">numericId</a>(), if the device supports such IDs. For future extensions, though, you should not use that function, but compare objects of this type using the equality operator.</p>
<p>This class is a thin wrapper around an integer ID. You pass it into and out of functions by value.</p>
<p>This type actively prevents you from holding it in a <a href="../qtcore/qlist.html">QList</a>, because doing so would be very inefficient. Use a <a href="../qtcore/qvector.html">QVector</a> instead, which has the same API as <a href="../qtcore/qlist.html">QList</a>, but more efficient storage.</p>
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<p><b>See also </b><a href="qtouchevent-touchpoint.html">QTouchEvent::TouchPoint</a>.</p>
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<h2>Property Documentation</h2>
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<h3 class="fn" id="numericId-prop"><a name="numericId-prop"></a><span class="name">numericId</span> : const <span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span></h3>
<p>This property holds the numeric unique ID of the token represented by a touchpoint</p>
<p>If the device provides a numeric ID, <a href="qpointingdeviceuniqueid.html#isValid">isValid</a>() returns true, and this property provides the numeric ID; otherwise it is -1.</p>
<p>You should not use the value of this property in portable code, but instead rely on equality to identify pointers.</p>
<p><b>Access functions:</b></p>
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<tr><td class="memItemLeft topAlign rightAlign"> qint64 </td><td class="memItemRight bottomAlign"><span class="name"><b>numericId</b></span>() const</td></tr>
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<p><b>See also </b><a href="qpointingdeviceuniqueid.html#isValid">isValid</a>().</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn" id="QPointingDeviceUniqueId"><a name="QPointingDeviceUniqueId"></a>QPointingDeviceUniqueId::<span class="name">QPointingDeviceUniqueId</span>()</h3>
<p>Constructs an invalid unique pointer ID.</p>
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<h3 class="fn" id="fromNumericId"><a name="fromNumericId"></a><code>[static] </code><span class="type"><a href="qpointingdeviceuniqueid.html#QPointingDeviceUniqueId">QPointingDeviceUniqueId</a></span> QPointingDeviceUniqueId::<span class="name">fromNumericId</span>(<span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span> <i>id</i>)</h3>
<p>Constructs a unique pointer ID from numeric ID <i>id</i>.</p>
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<h3 class="fn" id="isValid"><a name="isValid"></a><span class="type">bool</span> QPointingDeviceUniqueId::<span class="name">isValid</span>() const</h3>
<p>Returns whether this unique pointer ID is valid, that is, it represents an actual pointer.</p>
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<h2>Related Non-Members</h2>
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<h3 class="fn" id="qHash"><a name="qHash"></a><span class="type"><a href="../qtcore/qtglobal.html#uint-typedef">uint</a></span> <span class="name">qHash</span>(<span class="type"><a href="qpointingdeviceuniqueid.html#QPointingDeviceUniqueId">QPointingDeviceUniqueId</a></span> <i>key</i>, <span class="type"><a href="../qtcore/qtglobal.html#uint-typedef">uint</a></span> <i>seed</i> = 0)</h3>
<p>Returns the hash value for <i>key</i>, using <i>seed</i> to seed the calculation.</p>
<p>This function was introduced in  Qt 5.8.</p>
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<h3 class="fn" id="operator-not-eq"><a name="operator-not-eq"></a><span class="type">bool</span> <span class="name">operator!=</span>(<span class="type"><a href="qpointingdeviceuniqueid.html#QPointingDeviceUniqueId">QPointingDeviceUniqueId</a></span> <i>lhs</i>, <span class="type"><a href="qpointingdeviceuniqueid.html#QPointingDeviceUniqueId">QPointingDeviceUniqueId</a></span> <i>rhs</i>)</h3>
<p>Returns whether the two unique pointer IDs <i>lhs</i> and <i>rhs</i> identify different pointers (<code>true</code>) or not (<code>false</code>).</p>
<p>This function was introduced in  Qt 5.8.</p>
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<h3 class="fn" id="operator-eq-eq"><a name="operator-eq-eq"></a><span class="type">bool</span> <span class="name">operator==</span>(<span class="type"><a href="qpointingdeviceuniqueid.html#QPointingDeviceUniqueId">QPointingDeviceUniqueId</a></span> <i>lhs</i>, <span class="type"><a href="qpointingdeviceuniqueid.html#QPointingDeviceUniqueId">QPointingDeviceUniqueId</a></span> <i>rhs</i>)</h3>
<p>Returns whether the two unique pointer IDs <i>lhs</i> and <i>rhs</i> identify the same pointer (<code>true</code>) or not (<code>false</code>).</p>
<p>This function was introduced in  Qt 5.8.</p>
<!-- @@@operator== -->
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