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<td >Qt 5.12</td><td ><a href="qt3d-index.html">Qt 3D</a></td><td ><a href="qt3d-qml.html">QML Types</a></td><td >NodeInstantiator QML Type</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qt3d-index.html">Qt 5.12.2 Reference Documentation</a></td>
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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#signals">Signals</a></li>
<li class="level1"><a href="#methods">Methods</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">NodeInstantiator QML Type</h1>
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<p>Dynamically creates nodes. <a href="#details">More...</a></p>
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<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import Qt3D.Core 2.12</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 5.5</td></tr></table></div><ul>
<li><a href="qml-qt3d-core-nodeinstantiator-members.html">List of all members, including inherited members</a></li>
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<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qt3d-core-nodeinstantiator.html#active-prop">active</a></b></b> : bool</li>
<li class="fn"><b><b><a href="qml-qt3d-core-nodeinstantiator.html#asynchronous-prop">asynchronous</a></b></b> : bool</li>
<li class="fn"><b><b><a href="qml-qt3d-core-nodeinstantiator.html#count-prop">count</a></b></b> : int</li>
<li class="fn"><b><b><a href="qml-qt3d-core-nodeinstantiator.html#delegate-prop">delegate</a></b></b> : QtQml::Component</li>
<li class="fn"><b><b><a href="qml-qt3d-core-nodeinstantiator.html#model-prop">model</a></b></b> : variant</li>
<li class="fn"><b><b><a href="qml-qt3d-core-nodeinstantiator.html#object-prop">object</a></b></b> : QtQml::QtObject</li>
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<h2 id="signals">Signals</h2>
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<li class="fn"><b><b><a href="qml-qt3d-core-nodeinstantiator.html#objectAdded-signal">objectAdded</a></b></b>(int <i>index</i>, QtObject <i>object</i>)</li>
<li class="fn"><b><b><a href="qml-qt3d-core-nodeinstantiator.html#objectRemoved-signal">objectRemoved</a></b></b>(int <i>index</i>, QtObject <i>object</i>)</li>
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<h2 id="methods">Methods</h2>
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<li class="fn">QtQml::QtObject <b><b><a href="qml-qt3d-core-nodeinstantiator.html#objectAt-method">objectAt</a></b></b>(int <i>index</i>)</li>
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<h2 id="details">Detailed Description</h2>
<p>A <a href="qml-qt3d-core-nodeinstantiator.html">NodeInstantiator</a> can be used to control the dynamic creation of nodes, or to dynamically create multiple objects from a template.</p>
<p>The <a href="qml-qt3d-core-nodeinstantiator.html">NodeInstantiator</a> element will manage the objects it creates. Those objects are parented to the Instantiator and can also be deleted by the <a href="qml-qt3d-core-nodeinstantiator.html">NodeInstantiator</a> if the <a href="qml-qt3d-core-nodeinstantiator.html">NodeInstantiator</a>'s properties change. Nodes can also be destroyed dynamically through other means, and the <a href="qml-qt3d-core-nodeinstantiator.html">NodeInstantiator</a> will not recreate them unless the properties of the <a href="qml-qt3d-core-nodeinstantiator.html">NodeInstantiator</a> change.</p>
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<h2>Property Documentation</h2>
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<a name="active-prop"></a><span class="name">active</span> : <span class="type">bool</span></p></td></tr>
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</div><div class="qmldoc"><p>When active is <code>true</code>, and the delegate component is ready, the Instantiator will create objects according to the model. When active is <code>false</code>, no objects will be created and any previously created objects will be destroyed.</p>
<p>Default is <code>true</code>.</p>
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<a name="asynchronous-prop"></a><span class="name">asynchronous</span> : <span class="type">bool</span></p></td></tr>
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</div><div class="qmldoc"><p>When asynchronous is true the Instantiator will attempt to create objects asynchronously. This means that objects may not be available immediately, even if active is set to true.</p>
<p>You can use the <a href="qml-qt3d-core-nodeinstantiator.html#objectAdded-signal">objectAdded</a> signal to respond to items being created.</p>
<p>Default is <code>false</code>.</p>
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<a name="count-prop"></a><span class="qmlreadonly">[read-only] </span><span class="name">count</span> : <span class="type">int</span></p></td></tr>
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</div><div class="qmldoc"><p>The number of objects the Instantiator is currently managing.</p>
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<a name="delegate-prop"></a><span class="qmldefault">[default] </span><span class="name">delegate</span> : <span class="type">QtQml::Component</span></p></td></tr>
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</div><div class="qmldoc"><p>The component used to create all objects.</p>
<p>Note that an extra variable, index, will be available inside instances of the delegate. This variable refers to the index of the instance inside the Instantiator, and can be used to obtain the object through the itemAt method of the Instantiator.</p>
<p>If this property is changed, all instances using the old delegate will be destroyed and new instances will be created using the new delegate.</p>
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<a name="model-prop"></a><span class="name">model</span> : <span class="type">variant</span></p></td></tr>
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</div><div class="qmldoc"><p>This property can be set to any of the supported data models:</p>
<ul>
<li>A number that indicates the number of delegates to be created by the repeater</li>
<li>A model (for example, a ListModel item or a QAbstractItemModel subclass)</li>
<li>A string list</li>
<li>An object list</li>
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<p>The type of model affects the properties that are exposed to the <a href="qml-qt3d-core-nodeinstantiator.html#delegate-prop">delegate</a>.</p>
<p>Default value is 1, which creates a single delegate instance.</p>
<p><b>See also </b>Data Models.</p>
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<a name="object-prop"></a><span class="qmlreadonly">[read-only] </span><span class="name">object</span> : <span class="type">QtQml::QtObject</span></p></td></tr>
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</div><div class="qmldoc"><p>This is a reference to the first created object, intended as a convenience for the case where only one object has been created.</p>
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<h2>Signal Documentation</h2>
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<a name="objectAdded-signal"></a><span class="name">objectAdded</span>(<span class="type">int</span> <i>index</i>, <span class="type">QtObject</span> <i>object</i>)</p></td></tr>
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</div><div class="qmldoc"><p>This signal is emitted when a node is added to the <a href="qml-qt3d-core-nodeinstantiator.html">NodeInstantiator</a>. The <i>index</i> parameter holds the index which the node has been given, and the <i>object</i> parameter holds the <a href="qml-qt3d-core-node.html">Node</a> that has been added.</p>
<p>The corresponding handler is <code>onNodeAdded</code>.</p>
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<a name="objectRemoved-signal"></a><span class="name">objectRemoved</span>(<span class="type">int</span> <i>index</i>, <span class="type">QtObject</span> <i>object</i>)</p></td></tr>
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</div><div class="qmldoc"><p>This signal is emitted when an object is removed from the Instantiator. The <i>index</i> parameter holds the index which the object had been given, and the <i>object</i> parameter holds the QtObject that has been removed.</p>
<p>Do not keep a reference to <i>object</i> if it was created by this Instantiator, as in these cases it will be deleted shortly after the signal is handled.</p>
<p>The corresponding handler is <code>onObjectRemoved</code>.</p>
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<h2>Method Documentation</h2>
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<a name="objectAt-method"></a><span class="type">QtQml::QtObject</span> <span class="name">objectAt</span>(<span class="type">int</span> <i>index</i>)</p></td></tr>
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</div><div class="qmldoc"><p>Returns a reference to the object with the given <i>index</i>.</p>
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