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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- qquickanimation.cpp -->
  <title>NumberAnimation QML Type | Qt Quick 5.9</title>
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  </script>
</head>
<body>
<div class="header" id="qtdocheader">
  <div class="main">
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        <table><tr>
<td >Qt 5.9</td><td ><a href="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-qmlmodule.html">QML Types</a></td><td >NumberAnimation QML Type</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.5 Reference Documentation</td>
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<div class="toc">
<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
</ul>
</div>
<div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">NumberAnimation QML Type</h1>
<span class="subtitle"></span>
<!-- $$$NumberAnimation-brief -->
<p>Animates changes in qreal-type values <a href="#details">More...</a></p>
<!-- @@@NumberAnimation -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import QtQuick 2.7</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <p><a href="qml-qtquick-propertyanimation.html">PropertyAnimation</a></p>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherited By:</td><td class="memItemRight bottomAlign"> <p><a href="qml-qtquick-smoothedanimation.html">SmoothedAnimation</a> and <a href="qml-qtquick-springanimation.html">SpringAnimation</a></p>
</td></tr></table></div><ul>
<li><a href="qml-qtquick-numberanimation-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="properties"></a>
<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtquick-numberanimation.html#from-prop">from</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-numberanimation.html#to-prop">to</a></b></b> : real</li>
</ul>
<!-- $$$NumberAnimation-description -->
<a name="details"></a>
<h2 id="details">Detailed Description</h2>
<p><a href="qml-qtquick-numberanimation.html">NumberAnimation</a> is a specialized <a href="qtquick-animation-example.html#propertyanimation">PropertyAnimation</a> that defines an animation to be applied when a numerical value changes.</p>
<p>Here is a <a href="qml-qtquick-numberanimation.html">NumberAnimation</a> applied to the <code>x</code> property of a <a href="qml-qtquick-rectangle.html">Rectangle</a> as a property value source. It animates the <code>x</code> value from its current value to a value of 50, over 1000 milliseconds:</p>
<pre class="qml">

  import QtQuick 2.0

  <span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
      <span class="name">width</span>: <span class="number">100</span>; <span class="name">height</span>: <span class="number">100</span>
      <span class="name">color</span>: <span class="string">&quot;red&quot;</span>

      NumberAnimation on <span class="name">x</span> { <span class="name">to</span>: <span class="number">50</span>; <span class="name">duration</span>: <span class="number">1000</span> }
  }

</pre>
<p>Like any other animation type, a <a href="qml-qtquick-numberanimation.html">NumberAnimation</a> can be applied in a number of ways, including transitions, behaviors and property value sources. The <a href="qtquick-statesanimations-animations.html">Animation and Transitions in Qt Quick</a> documentation shows a variety of methods for creating animations.</p>
<p>Note that <a href="qml-qtquick-numberanimation.html">NumberAnimation</a> may not animate smoothly if there are irregular changes in the number value that it is tracking. If this is the case, use <a href="qml-qtquick-smoothedanimation.html">SmoothedAnimation</a> instead.</p>
<p><b>See also </b><a href="qtquick-statesanimations-animations.html">Animation and Transitions in Qt Quick</a> and <a href="qtquick-animation-example.html">Qt Quick Examples - Animation</a>.</p>
<!-- @@@NumberAnimation -->
<h2>Property Documentation</h2>
<!-- $$$from -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="from-prop">
<td class="tblQmlPropNode"><p>
<a name="from-prop"></a><span class="name">from</span> : <span class="type">real</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the starting value for the animation.</p>
<p>For example, the following animation is not applied until the <code>x</code> value has reached 100:</p>
<pre class="qml">

  <span class="type"><a href="qml-qtquick-item.html">Item</a></span> {
      <span class="name">states</span>: [
          <span class="comment">// ...</span>
      ]

      <span class="name">transition</span>: <span class="name">Transition</span> {
          <span class="type"><a href="qml-qtquick-numberanimation.html">NumberAnimation</a></span> { <span class="name">properties</span>: <span class="string">&quot;x&quot;</span>; <span class="name">from</span>: <span class="number">100</span>; <span class="name">duration</span>: <span class="number">200</span> }
      }
  }

</pre>
<p>If the <a href="qml-qtquick-numberanimation.html">NumberAnimation</a> is defined within a <a href="qmlexampletoggleswitch.html#transition">Transition</a> or <a href="qml-qtquick-behavior.html">Behavior</a>, this value defaults to the value defined in the starting state of the <a href="qmlexampletoggleswitch.html#transition">Transition</a>, or the current value of the property at the moment the <a href="qml-qtquick-behavior.html">Behavior</a> is triggered.</p>
<p><b>See also </b><a href="qtquick-statesanimations-animations.html">Animation and Transitions in Qt Quick</a>.</p>
</div></div><!-- @@@from -->
<br/>
<!-- $$$to -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="to-prop">
<td class="tblQmlPropNode"><p>
<a name="to-prop"></a><span class="name">to</span> : <span class="type">real</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the end value for the animation.</p>
<p>If the <a href="qml-qtquick-numberanimation.html">NumberAnimation</a> is defined within a <a href="qmlexampletoggleswitch.html#transition">Transition</a> or <a href="qml-qtquick-behavior.html">Behavior</a>, this value defaults to the value defined in the end state of the <a href="qmlexampletoggleswitch.html#transition">Transition</a>, or the value of the property change that triggered the <a href="qml-qtquick-behavior.html">Behavior</a>.</p>
<p><b>See also </b><a href="qtquick-statesanimations-animations.html">Animation and Transitions in Qt Quick</a>.</p>
</div></div><!-- @@@to -->
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