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<td >Qt 5.7</td><td ><a href="qtquickcontrols2-index.html">Qt Quick Controls 2</a></td><td ><a href="qtquick-controls2-qmlmodule.html">QML Types</a></td><td >Tumbler QML Type</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.7.1 Reference Documentation</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="#attached-properties">Attached Properties</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
<li class="level2"><a href="#non-wrapping-tumbler">Non-wrapping Tumbler</a></li>
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<h1 class="title">Tumbler QML Type</h1>
<span class="subtitle"></span>
<!-- $$$Tumbler-brief -->
<p>A spinnable wheel of items that can be selected. <a href="#details">More...</a></p>
<!-- @@@Tumbler -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import QtQuick.Controls 2.0</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 5.7</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <p><a href="qml-qtquick-controls2-control.html">Control</a></p>
</td></tr></table></div><ul>
<li><a href="qml-qtquick-controls2-tumbler-members.html">List of all members, including inherited members</a></li>
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<a name="properties"></a>
<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtquick-controls2-tumbler.html#count-prop">count</a></b></b> : int</li>
<li class="fn"><b><b><a href="qml-qtquick-controls2-tumbler.html#currentIndex-prop">currentIndex</a></b></b> : int</li>
<li class="fn"><b><b><a href="qml-qtquick-controls2-tumbler.html#currentItem-prop">currentItem</a></b></b> : Item</li>
<li class="fn"><b><b><a href="qml-qtquick-controls2-tumbler.html#delegate-prop">delegate</a></b></b> : component</li>
<li class="fn"><b><b><a href="qml-qtquick-controls2-tumbler.html#model-prop">model</a></b></b> : variant</li>
<li class="fn"><b><b><a href="qml-qtquick-controls2-tumbler.html#visibleItemCount-prop">visibleItemCount</a></b></b> : int</li>
</ul>
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<h2 id="attached-properties">Attached Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtquick-controls2-tumbler.html#displacement-attached-prop">displacement</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-controls2-tumbler.html#tumbler-attached-prop">tumbler</a></b></b> : Tumbler</li>
</ul>
<!-- $$$Tumbler-description -->
<a name="details"></a>
<h2 id="details">Detailed Description</h2>
</p>
<pre class="cpp">
Tumbler {
model: <span class="number">5</span>
<span class="comment">// ...</span>
}
</pre>
<a name="non-wrapping-tumbler"></a>
<h2 id="non-wrapping-tumbler">Non-wrapping Tumbler</h2>
<p>The default contentItem of Tumbler is a <a href="../qtquick/qml-qtquick-pathview.html">PathView</a>, which wraps when it reaches the top and bottom. To achieve a non-wrapping Tumbler, use <a href="../qtquick/qml-qtquick-listview.html">ListView</a> as the contentItem:</p>
<pre class="qml">
<span class="type"><a href="qml-qtquick-controls2-tumbler.html">Tumbler</a></span> {
<span class="name">id</span>: <span class="name">listViewTumbler</span>
<span class="name">contentItem</span>: <span class="name">ListView</span> {
<span class="name">anchors</span>.fill: <span class="name">parent</span>
<span class="name">model</span>: <span class="name">listViewTumbler</span>.<span class="name">model</span>
<span class="name">delegate</span>: <span class="name">listViewTumbler</span>.<span class="name">delegate</span>
<span class="name">snapMode</span>: <span class="name">ListView</span>.<span class="name">SnapToItem</span>
<span class="name">highlightRangeMode</span>: <span class="name">ListView</span>.<span class="name">StrictlyEnforceRange</span>
<span class="name">preferredHighlightBegin</span>: <span class="name">height</span> <span class="operator">/</span> <span class="number">2</span> <span class="operator">-</span> (<span class="name">height</span> <span class="operator">/</span> <span class="name">listViewTumbler</span>.<span class="name">visibleItemCount</span> <span class="operator">/</span> <span class="number">2</span>)
<span class="name">preferredHighlightEnd</span>: <span class="name">height</span> <span class="operator">/</span> <span class="number">2</span> <span class="operator">+</span> (<span class="name">height</span> <span class="operator">/</span> <span class="name">listViewTumbler</span>.<span class="name">visibleItemCount</span> <span class="operator">/</span> <span class="number">2</span>)
<span class="name">clip</span>: <span class="number">true</span>
}
}
</pre>
<p class="centerAlign"><img src="images/qtquickcontrols2-tumbler-wrap.gif" alt="" /></p><p><b>See also </b><a href="qtquickcontrols2-customize.html#customizing-tumbler">Customizing Tumbler</a> and <a href="qtquickcontrols2-input.html">Input Controls</a>.</p>
<!-- @@@Tumbler -->
<h2>Property Documentation</h2>
<!-- $$$count -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="count-prop">
<td class="tblQmlPropNode"><p>
<a name="count-prop"></a><span class="qmlreadonly">[read-only] </span><span class="name">count</span> : <span class="type">int</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the number of items in the model.</p>
</div></div><!-- @@@count -->
<br/>
<!-- $$$currentIndex -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="currentIndex-prop">
<td class="tblQmlPropNode"><p>
<a name="currentIndex-prop"></a><span class="name">currentIndex</span> : <span class="type">int</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the index of the current item.</p>
</div></div><!-- @@@currentIndex -->
<br/>
<!-- $$$currentItem -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="currentItem-prop">
<td class="tblQmlPropNode"><p>
<a name="currentItem-prop"></a><span class="qmlreadonly">[read-only] </span><span class="name">currentItem</span> : <span class="type"><a href="../qtquick/qml-qtquick-item.html">Item</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the item at the current index.</p>
</div></div><!-- @@@currentItem -->
<br/>
<!-- $$$delegate -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="delegate-prop">
<td class="tblQmlPropNode"><p>
<a name="delegate-prop"></a><span class="name">delegate</span> : <span class="type">component</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the delegate used to display each item.</p>
</div></div><!-- @@@delegate -->
<br/>
<!-- $$$model -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="model-prop">
<td class="tblQmlPropNode"><p>
<a name="model-prop"></a><span class="name">model</span> : <span class="type"><a href="../qtqml/qml-variant.html">variant</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the model that provides data for this tumbler.</p>
</div></div><!-- @@@model -->
<br/>
<!-- $$$visibleItemCount -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="visibleItemCount-prop">
<td class="tblQmlPropNode"><p>
<a name="visibleItemCount-prop"></a><span class="name">visibleItemCount</span> : <span class="type">int</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the number of items visible in the tumbler. It must be an odd number, as the current item is always vertically centered.</p>
</div></div><!-- @@@visibleItemCount -->
<br/>
<h2>Attached Property Documentation</h2>
<!-- $$$displacement -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="displacement-attached-prop">
<td class="tblQmlPropNode"><p>
<a name="displacement-attached-prop"></a><span class="qmlreadonly">[read-only] </span><span class="name">Tumbler.displacement</span> : <span class="type">real</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This attached property holds a value from <code>-visibleItemCount / 2</code> to <code>visibleItemCount / 2</code>, which represents how far away this item is from being the current item, with <code>0</code> being completely current.</p>
<p>For example, the item below will be 40% opaque when it is not the current item, and transition to 100% opacity when it becomes the current item:</p>
<pre class="cpp">
delegate: Text {
text: modelData
opacity: <span class="number">0.4</span> <span class="operator">+</span> Math<span class="operator">.</span>max(<span class="number">0</span><span class="operator">,</span> <span class="number">1</span> <span class="operator">-</span> Math<span class="operator">.</span>abs(Tumbler<span class="operator">.</span>displacement)) <span class="operator">*</span> <span class="number">0.6</span>
}
</pre>
</div></div><!-- @@@displacement -->
<br/>
<!-- $$$tumbler -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="tumbler-attached-prop">
<td class="tblQmlPropNode"><p>
<a name="tumbler-attached-prop"></a><span class="qmlreadonly">[read-only] </span><span class="name">Tumbler.tumbler</span> : <span class="type"><a href="qml-qtquick-controls2-tumbler.html">Tumbler</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This attached property holds the tumbler. The property can be attached to a tumbler delegate. The value is <code>null</code> if the item is not a tumbler delegate.</p>
</div></div><!-- @@@tumbler -->
<br/>
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