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<!DOCTYPE html><html><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><title>Animated – React Native | A framework for building native apps using React</title><meta name="viewport" content="width=device-width"><meta property="og:title" content="Animated – React Native | A framework for building native apps using React"><meta property="og:type" content="website"><meta property="og:url" content="http://facebook.github.io/react-native/index.html"><meta property="og:image" content="http://facebook.github.io/react-native/img/opengraph.png?2"><meta property="og:description" content="A framework for building native apps using React"><link rel="shortcut icon" href="/react-native/img/favicon.png?2"><link rel="stylesheet" href="/react-native/css/react-native.css"><script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script><script type="text/javascript">try{Typekit.load();}catch(e){}</script></head><body><div class="container"><div class="nav-main"><div class="wrap"><a class="nav-home" href="/react-native/"><img src="/react-native/img/header_logo.png">React Native</a><div class="nav-site-wrapper"><ul class="nav-site nav-site-internal"><li><a href="/react-native/docs/getting-started.html" class="active">Docs</a></li><li><a href="/react-native/support.html" class="">Support</a></li><li><a href="https://github.com/facebook/react-native/releases" class="">Releases</a></li><li><a href="http://reactnative.cc" class="">Newsletter</a></li><li><a href="/react-native/showcase.html" class="">Showcase</a></li></ul><ul class="nav-site nav-site-external"><li><a href="https://github.com/facebook/react-native" class="">GitHub</a></li><li><a href="http://facebook.github.io/react" class="">React</a></li></ul></div></div></div><section class="content wrap documentationContent"><div class="nav-docs"><div class="nav-docs-section"><h3>Quick Start</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/getting-started.html#content">Getting Started</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/tutorial.html#content">Tutorial</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/videos.html#content">Videos</a></li></ul></div><div class="nav-docs-section"><h3>Guides</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/style.html#content">Style</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/gesture-responder-system.html#content">Gesture Responder System</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/animations.html#content">Animations</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/accessibility.html#content">Accessibility (iOS)</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/native-modules-ios.html#content">Native Modules (iOS)</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/native-components-ios.html#content">Native UI Components (iOS)</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/direct-manipulation.html#content">Direct Manipulation</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/linking-libraries-ios.html#content">Linking Libraries (iOS)</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/debugging.html#content">Debugging</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/testing.html#content">Testing</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/running-on-device-ios.html#content">Running On Device (iOS)</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/embedded-app-ios.html#content">Integrating with Existing Apps (iOS)</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/javascript-environment.html#content">JavaScript Environment</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/navigator-comparison.html#content">Navigator Comparison</a></li></ul></div><div class="nav-docs-section"><h3>components</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/activityindicatorios.html#content">ActivityIndicatorIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/datepickerios.html#content">DatePickerIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/image.html#content">Image</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/listview.html#content">ListView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/mapview.html#content">MapView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/navigator.html#content">Navigator</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/modal.html#content">Modal</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/navigatorios.html#content">NavigatorIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/pickerios.html#content">PickerIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/progressviewios.html#content">ProgressViewIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/scrollview.html#content">ScrollView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/segmentedcontrolios.html#content">SegmentedControlIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/sliderios.html#content">SliderIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/switchios.html#content">SwitchIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/tabbarios.html#content">TabBarIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/tabbarios-item.html#content">TabBarIOS.Item</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/text.html#content">Text</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/textinput.html#content">TextInput</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchablehighlight.html#content">TouchableHighlight</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchableopacity.html#content">TouchableOpacity</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchablewithoutfeedback.html#content">TouchableWithoutFeedback</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/view.html#content">View</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/webview.html#content">WebView</a></li></ul></div><div class="nav-docs-section"><h3>apis</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/actionsheetios.html#content">ActionSheetIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/alertios.html#content">AlertIOS</a></li><li><a style="margin-left:0;" class="active" href="/react-native/docs/animated.html#content">Animated</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/appregistry.html#content">AppRegistry</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/appstateios.html#content">AppStateIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/asyncstorage.html#content">AsyncStorage</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/cameraroll.html#content">CameraRoll</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/interactionmanager.html#content">InteractionManager</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/layoutanimation.html#content">LayoutAnimation</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/linkingios.html#content">LinkingIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/netinfo.html#content">NetInfo</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/panresponder.html#content">PanResponder</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/pixelratio.html#content">PixelRatio</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/pushnotificationios.html#content">PushNotificationIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/statusbarios.html#content">StatusBarIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/stylesheet.html#content">StyleSheet</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/vibrationios.html#content">VibrationIOS</a></li></ul></div><div class="nav-docs-section"><h3>Polyfills</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/flexbox.html#content">Flexbox</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/geolocation.html#content">Geolocation</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/network.html#content">Network</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/timers.html#content">Timers</a></li></ul></div></div><div class="inner-content"><a id="content"></a><h1>Animated</h1><div><div><p>Animations are an important part of modern UX, and the <code>Animated</code>
library is designed to make them fluid, powerful, and easy to build and
maintain.</p><p>The simplest workflow is to create an <code>Animated.Value</code>, hook it up to one or
more style attributes of an animated component, and then drive updates either
via animations, such as <code>Animated.timing</code>, or by hooking into gestures like
panning or scolling via <code>Animated.event</code>. <code>Animated.Value</code> can also bind to
props other than style, and can be interpolated as well. Here is a basic
example of a container view that will fade in when it&#x27;s mounted:</p><div class="prism language-javascript"> class <span class="token class-name">FadeInView</span> extends <span class="token class-name">React<span class="token punctuation">.</span>Component</span> <span class="token punctuation">{</span>
<span class="token function">constructor<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">super<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>state <span class="token operator">=</span> <span class="token punctuation">{</span>
fadeAnim<span class="token punctuation">:</span> <span class="token keyword">new</span> <span class="token class-name">Animated<span class="token punctuation">.</span>Value</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token comment" spellcheck="true"> // init opacity 0
</span> <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">componentDidMount<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
Animated<span class="token punctuation">.</span><span class="token function">timing<span class="token punctuation">(</span></span> <span class="token comment" spellcheck="true"> // Uses easing functions
</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>fadeAnim<span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // The value to drive
</span> <span class="token punctuation">{</span>toValue<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // Configuration
</span> <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">start<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true"> // Don&#x27;t forget start!
</span> <span class="token punctuation">}</span>
<span class="token function">render<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span>
&lt;Animated<span class="token punctuation">.</span>View <span class="token comment" spellcheck="true"> // Special animatable View
</span> style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>opacity<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>fadeAnim<span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token operator">&gt;</span><span class="token comment" spellcheck="true"> // Binds
</span> <span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>props<span class="token punctuation">.</span>children<span class="token punctuation">}</span>
&lt;<span class="token operator">/</span>Animated<span class="token punctuation">.</span>View<span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span></div><p>Note that only animatable components can be animated. <code>View</code>, <code>Text</code>, and
<code>Image</code> are already provided, and you can create custom ones with
<code>createAnimatedComponent</code>. These special components do the magic of binding
the animated values to the properties, and do targetted native updates to
avoid the cost of the react render and reconciliation process on every frame.
They also handle cleanup on unmount so they are safe by default.</p><p>Animations are heavily configurable. Custom and pre-defined easing
functions, delays, durations, decay factors, spring constants, and more can
all be tweaked depending on the type of animation.</p><p>A single <code>Animated.Value</code> can drive any number of properties, and each
property can be run through an interpolation first. An interpolation maps
input ranges to output ranges, typically using a linear interpolation but
also supports easing functions. By default, it will extrapolate the curve
beyond the ranges given, but you can also have it clamp the output value.</p><p>For example, you may want to think about your <code>Animated.Value</code> as going from
0 to 1, but animate the position from 150px to 0px and the opacity from 0 to
1. This can easily be done by modifying <code>style</code> in the example above like so:</p><div class="prism language-javascript"> style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>
opacity<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>fadeAnim<span class="token punctuation">,</span><span class="token comment" spellcheck="true"> // Binds directly
</span> transform<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token punctuation">{</span>
translateY<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>fadeAnim<span class="token punctuation">.</span><span class="token function">interpolate<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
inputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
outputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">150</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">]</span> <span class="token comment" spellcheck="true"> // 0 : 150, 0.5 : 75, 1 : 0
</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token operator">&gt;</span></div><p>Animations can also be combined in complex ways using composition functions
such as <code>sequence</code> and <code>parallel</code>, and can also be chained together simply
by setting the <code>toValue</code> of one animation to be another <code>Animated.Value</code>.</p><p><code>Animated.ValueXY</code> is handy for 2D animations, like panning, and there are
other helpful additions like <code>setOffset</code> and <code>getLayout</code> to aid with typical
interaction patterns, like drag-and-drop.</p><p>You can see more example usage in <code>AnimationExample.js</code>, the Gratuitous
Animation App, and <a href="http://facebook.github.io/react-native/docs/animations.html" target="_blank">Animations documentation guide</a>.</p><p>Note that <code>Animated</code> is designed to be fully serializable so that animations
can be run in a high performace way, independent of the normal JavaScript
event loop. This does influence the API, so keep that in mind when it seems a
little trickier to do something compared to a fully synchronous system.
Checkout <code>Animated.Value.addListener</code> as a way to work around some of these
limitations, but use it sparingly since it might have performance
implications in the future.</p></div><span><h3><a class="anchor" name="methods"></a>Methods <a class="hash-link" href="#methods">#</a></h3><div class="props"><div class="prop"><h4 class="propTitle"><a class="anchor" name="decay"></a><span class="propType">static </span>decay<span class="propType">(value: AnimatedValue | AnimatedValueXY, config: DecayAnimationConfig)</span> <a class="hash-link" href="#decay">#</a></h4><div><p>Animates a value from an initial velocity to zero based on a decay
coefficient.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="timing"></a><span class="propType">static </span>timing<span class="propType">(value: AnimatedValue | AnimatedValueXY, config: TimingAnimationConfig)</span> <a class="hash-link" href="#timing">#</a></h4><div><p>Animates a value along a timed easing curve. The <code>Easing</code> module has tons
of pre-defined curves, or you can use your own function.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="spring"></a><span class="propType">static </span>spring<span class="propType">(value: AnimatedValue | AnimatedValueXY, config: SpringAnimationConfig)</span> <a class="hash-link" href="#spring">#</a></h4><div><p>Spring animation based on Rebound and Origami. Tracks velocity state to
create fluid motions as the <code>toValue</code> updates, and can be chained together.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="delay"></a><span class="propType">static </span>delay<span class="propType">(time: number)</span> <a class="hash-link" href="#delay">#</a></h4><div><p>Starts an animation after the given delay.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="sequence"></a><span class="propType">static </span>sequence<span class="propType">(animations: Array&lt;CompositeAnimation&gt;)</span> <a class="hash-link" href="#sequence">#</a></h4><div><p>Starts an array of animations in order, waiting for each to complete
before starting the next. If the current running animation is stopped, no
following animations will be started.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="parallel"></a><span class="propType">static </span>parallel<span class="propType">(animations: Array&lt;CompositeAnimation&gt;, config?: ParallelConfig)</span> <a class="hash-link" href="#parallel">#</a></h4><div><p>Starts an array of animations all at the same time. By default, if one
of the animations is stopped, they will all be stopped. You can override
this with the <code>stopTogether</code> flag.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="stagger"></a><span class="propType">static </span>stagger<span class="propType">(time: number, animations: Array&lt;CompositeAnimation&gt;)</span> <a class="hash-link" href="#stagger">#</a></h4><div><p>Array of animations may run in parallel (overlap), but are started in
sequence with successive delays. Nice for doing trailing effects.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="event"></a><span class="propType">static </span>event<span class="propType">(argMapping: Array&lt;Mapping&gt;, config?: EventConfig)</span> <a class="hash-link" href="#event">#</a></h4><div><p> Takes an array of mappings and extracts values from each arg accordingly,
then calls <code>setValue</code> on the mapped outputs. e.g.</p><div class="prism language-javascript"> onScroll<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">AnimatedEvent<span class="token punctuation">(</span></span>
<span class="token punctuation">[</span><span class="token punctuation">{</span>nativeEvent<span class="token punctuation">:</span> <span class="token punctuation">{</span>contentOffset<span class="token punctuation">:</span> <span class="token punctuation">{</span>x<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_scrollX<span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token punctuation">]</span>
<span class="token punctuation">{</span>listener<span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // Optional async listener
</span> <span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
onPanResponderMove<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">AnimatedEvent<span class="token punctuation">(</span></span><span class="token punctuation">[</span>
<span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // raw event arg ignored
</span> <span class="token punctuation">{</span>dx<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_panX<span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // gestureState arg
</span> <span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">,</span></div></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="createanimatedcomponent"></a><span class="propType">static </span>createAnimatedComponent<span class="propType">(Component: any)</span> <a class="hash-link" href="#createanimatedcomponent">#</a></h4><div><p>Make any React component Animatable. Used to create <code>Animated.View</code>, etc.</p></div></div></div></span><span><h3><a class="anchor" name="properties"></a>Properties <a class="hash-link" href="#properties">#</a></h3><div class="props"><div class="prop"><h4 class="propTitle"><a class="anchor" name="value"></a>Value<span class="propType">: AnimatedValue</span> <a class="hash-link" href="#value">#</a></h4><div><p>Standard value class for driving animations. Typically initialized with
<code>new Animated.Value(0);</code></p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="valuexy"></a>ValueXY<span class="propType">: AnimatedValueXY</span> <a class="hash-link" href="#valuexy">#</a></h4><div><p>2D value class for driving 2D animations, such as pan gestures.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="view"></a>View<span class="propType">: CallExpression</span> <a class="hash-link" href="#view">#</a></h4><div><p>An animatable View component.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="text"></a>Text<span class="propType">: CallExpression</span> <a class="hash-link" href="#text">#</a></h4><div><p>An animatable Text component.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="image"></a>Image<span class="propType">: CallExpression</span> <a class="hash-link" href="#image">#</a></h4><div><p>An animatable Image component.</p></div></div></div></span><span><div><span><h2><a class="anchor" name="animatedvalue"></a>class AnimatedValue <a class="hash-link" href="#animatedvalue">#</a></h2><ul><div><p>Standard value for driving animations. One <code>Animated.Value</code> can drive
multiple properties in a synchronized fashion, but can only be driven by one
mechanism at a time. Using a new mechanism (e.g. starting a new animation,
or calling <code>setValue</code>) will stop any previous ones.</p></div><span><h3><a class="anchor" name="methods"></a>Methods <a class="hash-link" href="#methods">#</a></h3><div class="props"><div class="prop"><h4 class="propTitle"><a class="anchor" name="constructor"></a>constructor<span class="propType">(value: number)</span> <a class="hash-link" href="#constructor">#</a></h4></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="setvalue"></a>setValue<span class="propType">(value: number)</span> <a class="hash-link" href="#setvalue">#</a></h4><div><p>Directly set the value. This will stop any animations running on the value
and udpate all the bound properties.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="setoffset"></a>setOffset<span class="propType">(offset: number)</span> <a class="hash-link" href="#setoffset">#</a></h4><div><p>Sets an offset that is applied on top of whatever value is set, whether via
<code>setValue</code>, an animation, or <code>Animated.event</code>. Useful for compensating
things like the start of a pan gesture.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="flattenoffset"></a>flattenOffset<span class="propType">()</span> <a class="hash-link" href="#flattenoffset">#</a></h4><div><p>Merges the offset value into the base value and resets the offset to zero.
The final output of the value is unchanged.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="addlistener"></a>addListener<span class="propType">(callback: ValueListenerCallback)</span> <a class="hash-link" href="#addlistener">#</a></h4><div><p>Adds an asynchronous listener to the value so you can observe updates from
animations or whathaveyou. This is useful because there is no way to
syncronously read the value because it might be driven natively.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="removelistener"></a>removeListener<span class="propType">(id: string)</span> <a class="hash-link" href="#removelistener">#</a></h4></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="removealllisteners"></a>removeAllListeners<span class="propType">()</span> <a class="hash-link" href="#removealllisteners">#</a></h4></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="stopanimation"></a>stopAnimation<span class="propType">(callback?: ?(value: number) =&gt; void)</span> <a class="hash-link" href="#stopanimation">#</a></h4><div><p>Stops any running animation or tracking. <code>callback</code> is invoked with the
final value after stopping the animation, which is useful for updating
state to match the animation position with layout.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="interpolate"></a>interpolate<span class="propType">(config: InterpolationConfigType)</span> <a class="hash-link" href="#interpolate">#</a></h4><div><p>Interpolates the value before updating the property, e.g. mapping 0-1 to
0-10.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="animate"></a>animate<span class="propType">(animation: Animation, callback: EndCallback)</span> <a class="hash-link" href="#animate">#</a></h4><div><p>Typically only used internally, but could be used by a custom Animation
class.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="stoptracking"></a>stopTracking<span class="propType">()</span> <a class="hash-link" href="#stoptracking">#</a></h4><div><p>Typically only used internally.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="track"></a>track<span class="propType">(tracking: Animated)</span> <a class="hash-link" href="#track">#</a></h4><div><p>Typically only used internally.</p></div></div></div></span></ul></span><span><h2><a class="anchor" name="animatedvaluexy"></a>class AnimatedValueXY <a class="hash-link" href="#animatedvaluexy">#</a></h2><ul><div><p>2D Value for driving 2D animations, such as pan gestures. Almost identical
API to normal <code>Animated.Value</code>, but multiplexed. Contains two regular
<code>Animated.Value</code>s under the hood. Example:</p><div class="prism language-javascript"> class <span class="token class-name">DraggableView</span> extends <span class="token class-name">React<span class="token punctuation">.</span>Component</span> <span class="token punctuation">{</span>
<span class="token function">constructor<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">super<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>state <span class="token operator">=</span> <span class="token punctuation">{</span>
pan<span class="token punctuation">:</span> <span class="token keyword">new</span> <span class="token class-name">Animated<span class="token punctuation">.</span>ValueXY</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token comment" spellcheck="true"> // inits to zero
</span> <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>panResponder <span class="token operator">=</span> PanResponder<span class="token punctuation">.</span><span class="token function">create<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
onStartShouldSetPanResponder<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
onPanResponderMove<span class="token punctuation">:</span> Animated<span class="token punctuation">.</span><span class="token function">event<span class="token punctuation">(</span></span><span class="token punctuation">[</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
dx<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>pan<span class="token punctuation">.</span>x<span class="token punctuation">,</span><span class="token comment" spellcheck="true"> // x,y are Animated.Value
</span> dy<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>pan<span class="token punctuation">.</span>y<span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
onPanResponderRelease<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
Animated<span class="token punctuation">.</span><span class="token function">spring<span class="token punctuation">(</span></span>
<span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>pan<span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // Auto-multiplexed
</span> <span class="token punctuation">{</span>toValue<span class="token punctuation">:</span> <span class="token punctuation">{</span>x<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">,</span> y<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token comment" spellcheck="true"> // Back to zero
</span> <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">start<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">render<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span>
&lt;Animated<span class="token punctuation">.</span>View
<span class="token punctuation">{</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>panResponder<span class="token punctuation">.</span>panHandlers<span class="token punctuation">}</span>
style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>pan<span class="token punctuation">.</span><span class="token function">getLayout<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token operator">&gt;</span>
<span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>props<span class="token punctuation">.</span>children<span class="token punctuation">}</span>
&lt;<span class="token operator">/</span>Animated<span class="token punctuation">.</span>View<span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span></div></div><span><h3><a class="anchor" name="methods"></a>Methods <a class="hash-link" href="#methods">#</a></h3><div class="props"><div class="prop"><h4 class="propTitle"><a class="anchor" name="constructor"></a>constructor<span class="propType">(valueIn?: ?{x: number | AnimatedValue; y: number | AnimatedValue})</span> <a class="hash-link" href="#constructor">#</a></h4></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="setvalue"></a>setValue<span class="propType">(value: {x: number; y: number})</span> <a class="hash-link" href="#setvalue">#</a></h4></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="setoffset"></a>setOffset<span class="propType">(offset: {x: number; y: number})</span> <a class="hash-link" href="#setoffset">#</a></h4></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="flattenoffset"></a>flattenOffset<span class="propType">()</span> <a class="hash-link" href="#flattenoffset">#</a></h4></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="stopanimation"></a>stopAnimation<span class="propType">(callback?: ?() =&gt; number)</span> <a class="hash-link" href="#stopanimation">#</a></h4></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="addlistener"></a>addListener<span class="propType">(callback: ValueXYListenerCallback)</span> <a class="hash-link" href="#addlistener">#</a></h4></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="removelistener"></a>removeListener<span class="propType">(id: string)</span> <a class="hash-link" href="#removelistener">#</a></h4></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="getlayout"></a>getLayout<span class="propType">()</span> <a class="hash-link" href="#getlayout">#</a></h4><div><p>Converts <code>{x, y}</code> into <code>{left, top}</code> for use in style, e.g.</p><div class="prism language-javascript"> style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>anim<span class="token punctuation">.</span><span class="token function">getLayout<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">}</span></div></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="gettranslatetransform"></a>getTranslateTransform<span class="propType">()</span> <a class="hash-link" href="#gettranslatetransform">#</a></h4><div><p>Converts <code>{x, y}</code> into a useable translation transform, e.g.</p><div class="prism language-javascript"> style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>
transform<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>anim<span class="token punctuation">.</span><span class="token function">getTranslateTransform<span class="token punctuation">(</span></span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">}</span></div></div></div></div></span></ul></span></div></span></div><div><h3><a class="anchor" name="examples"></a><a class="edit-github" href="https://github.com/facebook/react-native/blob/master/Examples/UIExplorer/AnimatedExample.js">Edit on GitHub</a>Examples <a class="hash-link" href="#examples">#</a></h3><div class="prism language-javascript"><span class="token string">&#x27;use strict&#x27;</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> React <span class="token operator">=</span> <span class="token function">require<span class="token punctuation">(</span></span><span class="token string">&#x27;react-native&#x27;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> <span class="token punctuation">{</span>
Animated<span class="token punctuation">,</span>
Easing<span class="token punctuation">,</span>
StyleSheet<span class="token punctuation">,</span>
Text<span class="token punctuation">,</span>
View<span class="token punctuation">,</span>
<span class="token punctuation">}</span> <span class="token operator">=</span> React<span class="token punctuation">;</span>
<span class="token keyword">var</span> UIExplorerButton <span class="token operator">=</span> <span class="token function">require<span class="token punctuation">(</span></span><span class="token string">&#x27;./UIExplorerButton&#x27;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
exports<span class="token punctuation">.</span>framework <span class="token operator">=</span> <span class="token string">&#x27;React&#x27;</span><span class="token punctuation">;</span>
exports<span class="token punctuation">.</span>title <span class="token operator">=</span> <span class="token string">&#x27;Animated - Examples&#x27;</span><span class="token punctuation">;</span>
exports<span class="token punctuation">.</span>description <span class="token operator">=</span> <span class="token string">&#x27;Animated provides a powerful &#x27;</span> <span class="token operator">+</span>
<span class="token string">&#x27;and easy-to-use API for building modern, &#x27;</span> <span class="token operator">+</span>
<span class="token string">&#x27;interactive user experiences.&#x27;</span><span class="token punctuation">;</span>
exports<span class="token punctuation">.</span>examples <span class="token operator">=</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span>
title<span class="token punctuation">:</span> <span class="token string">&#x27;FadeInView&#x27;</span><span class="token punctuation">,</span>
description<span class="token punctuation">:</span> <span class="token string">&#x27;Uses a simple timing animation to &#x27;</span> <span class="token operator">+</span>
<span class="token string">&#x27;bring opacity from 0 to 1 when the component &#x27;</span> <span class="token operator">+</span>
<span class="token string">&#x27;mounts.&#x27;</span><span class="token punctuation">,</span>
render<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
class <span class="token class-name">FadeInView</span> extends <span class="token class-name">React<span class="token punctuation">.</span>Component</span> <span class="token punctuation">{</span>
<span class="token function">constructor<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">super<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>state <span class="token operator">=</span> <span class="token punctuation">{</span>
fadeAnim<span class="token punctuation">:</span> <span class="token keyword">new</span> <span class="token class-name">Animated<span class="token punctuation">.</span>Value</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token comment" spellcheck="true"> // opacity 0
</span> <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">componentDidMount<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
Animated<span class="token punctuation">.</span><span class="token function">timing<span class="token punctuation">(</span></span> <span class="token comment" spellcheck="true"> // Uses easing functions
</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>fadeAnim<span class="token punctuation">,</span><span class="token comment" spellcheck="true"> // The value to drive
</span> <span class="token punctuation">{</span>
toValue<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // Target
</span> duration<span class="token punctuation">:</span> <span class="token number">2000</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // Configuration
</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">start<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true"> // Don&#x27;t forget start!
</span> <span class="token punctuation">}</span>
<span class="token function">render<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span>
&lt;Animated<span class="token punctuation">.</span>View <span class="token comment" spellcheck="true"> // Special animatable View
</span> style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>
opacity<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>fadeAnim<span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // Binds
</span> <span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token operator">&gt;</span>
<span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>props<span class="token punctuation">.</span>children<span class="token punctuation">}</span>
&lt;<span class="token operator">/</span>Animated<span class="token punctuation">.</span>View<span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
class <span class="token class-name">FadeInExample</span> extends <span class="token class-name">React<span class="token punctuation">.</span>Component</span> <span class="token punctuation">{</span>
<span class="token function">constructor<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">super<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>state <span class="token operator">=</span> <span class="token punctuation">{</span>
show<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">render<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span>
&lt;View<span class="token operator">&gt;</span>
&lt;UIExplorerButton onPress<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState<span class="token punctuation">(</span></span><span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">(</span>
<span class="token punctuation">{</span>show<span class="token punctuation">:</span> <span class="token operator">!</span>state<span class="token punctuation">.</span>show<span class="token punctuation">}</span>
<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token operator">&gt;</span>
Press to <span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>show <span class="token operator">?</span>
<span class="token string">&#x27;Hide&#x27;</span> <span class="token punctuation">:</span> <span class="token string">&#x27;Show&#x27;</span><span class="token punctuation">}</span>
&lt;<span class="token operator">/</span>UIExplorerButton<span class="token operator">&gt;</span>
<span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>show &amp;&amp; &lt;FadeInView<span class="token operator">&gt;</span>
&lt;View style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>content<span class="token punctuation">}</span><span class="token operator">&gt;</span>
&lt;Text<span class="token operator">&gt;</span>FadeInView&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;<span class="token operator">/</span>View<span class="token operator">&gt;</span>
&lt;<span class="token operator">/</span>FadeInView<span class="token operator">&gt;</span><span class="token punctuation">}</span>
&lt;<span class="token operator">/</span>View<span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> &lt;FadeInExample <span class="token operator">/</span><span class="token operator">&gt;</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span>
title<span class="token punctuation">:</span> <span class="token string">&#x27;Transform Bounce&#x27;</span><span class="token punctuation">,</span>
description<span class="token punctuation">:</span> <span class="token string">&#x27;One `Animated.Value` is driven by a &#x27;</span> <span class="token operator">+</span>
<span class="token string">&#x27;spring with custom constants and mapped to an &#x27;</span> <span class="token operator">+</span>
<span class="token string">&#x27;ordered set of transforms. Each transform has &#x27;</span> <span class="token operator">+</span>
<span class="token string">&#x27;an interpolation to convert the value into the &#x27;</span> <span class="token operator">+</span>
<span class="token string">&#x27;right range and units.&#x27;</span><span class="token punctuation">,</span>
render<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>anim <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>anim <span class="token operator">||</span> <span class="token keyword">new</span> <span class="token class-name">Animated<span class="token punctuation">.</span>Value</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span>
&lt;View<span class="token operator">&gt;</span>
&lt;UIExplorerButton onPress<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
Animated<span class="token punctuation">.</span><span class="token function">spring<span class="token punctuation">(</span></span><span class="token keyword">this</span><span class="token punctuation">.</span>anim<span class="token punctuation">,</span> <span class="token punctuation">{</span>
toValue<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // Returns to the start
</span> velocity<span class="token punctuation">:</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // Velocity makes it move
</span> tension<span class="token punctuation">:</span> <span class="token operator">-</span><span class="token number">10</span><span class="token punctuation">,</span><span class="token comment" spellcheck="true"> // Slow
</span> friction<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // Oscillate a lot
</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">start<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token operator">&gt;</span>
Press to Fling it<span class="token operator">!</span>
&lt;<span class="token operator">/</span>UIExplorerButton<span class="token operator">&gt;</span>
&lt;Animated<span class="token punctuation">.</span>View
style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">[</span>styles<span class="token punctuation">.</span>content<span class="token punctuation">,</span> <span class="token punctuation">{</span>
transform<span class="token punctuation">:</span> <span class="token punctuation">[</span> <span class="token comment" spellcheck="true"> // Array order matters
</span> <span class="token punctuation">{</span>scale<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>anim<span class="token punctuation">.</span><span class="token function">interpolate<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
inputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
outputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span>translateX<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>anim<span class="token punctuation">.</span><span class="token function">interpolate<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
inputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
outputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">500</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span>rotate<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>anim<span class="token punctuation">.</span><span class="token function">interpolate<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
inputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
outputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span>
<span class="token string">&#x27;0deg&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;360deg&#x27;</span><span class="token comment" spellcheck="true"> // &#x27;deg&#x27; or &#x27;rad&#x27;
</span> <span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">]</span><span class="token punctuation">}</span>
<span class="token punctuation">]</span><span class="token punctuation">}</span><span class="token operator">&gt;</span>
&lt;Text<span class="token operator">&gt;</span>Transforms<span class="token operator">!</span>&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;<span class="token operator">/</span>Animated<span class="token punctuation">.</span>View<span class="token operator">&gt;</span>
&lt;<span class="token operator">/</span>View<span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span>
title<span class="token punctuation">:</span> <span class="token string">&#x27;Composite Animations with Easing&#x27;</span><span class="token punctuation">,</span>
description<span class="token punctuation">:</span> <span class="token string">&#x27;Sequence, parallel, delay, and &#x27;</span> <span class="token operator">+</span>
<span class="token string">&#x27;stagger with different easing functions.&#x27;</span><span class="token punctuation">,</span>
render<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>anims <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>anims <span class="token operator">||</span> <span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">,</span><span class="token number">3</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span>
<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token keyword">new</span> <span class="token class-name">Animated<span class="token punctuation">.</span>Value</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span>
&lt;View<span class="token operator">&gt;</span>
&lt;UIExplorerButton onPress<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
<span class="token keyword">var</span> timing <span class="token operator">=</span> Animated<span class="token punctuation">.</span>timing<span class="token punctuation">;</span>
Animated<span class="token punctuation">.</span><span class="token function">sequence<span class="token punctuation">(</span></span><span class="token punctuation">[</span><span class="token comment" spellcheck="true"> // One after the other
</span> <span class="token function">timing<span class="token punctuation">(</span></span><span class="token keyword">this</span><span class="token punctuation">.</span>anims<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
toValue<span class="token punctuation">:</span> <span class="token number">200</span><span class="token punctuation">,</span>
easing<span class="token punctuation">:</span> Easing<span class="token punctuation">.</span>linear<span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
Animated<span class="token punctuation">.</span><span class="token function">delay<span class="token punctuation">(</span></span><span class="token number">400</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token comment" spellcheck="true"> // Use with sequence
</span> <span class="token function">timing<span class="token punctuation">(</span></span><span class="token keyword">this</span><span class="token punctuation">.</span>anims<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
toValue<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
easing<span class="token punctuation">:</span> Easing<span class="token punctuation">.</span><span class="token function">elastic<span class="token punctuation">(</span></span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token comment" spellcheck="true"> // Springy
</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
Animated<span class="token punctuation">.</span><span class="token function">delay<span class="token punctuation">(</span></span><span class="token number">400</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
Animated<span class="token punctuation">.</span><span class="token function">stagger<span class="token punctuation">(</span></span><span class="token number">200</span><span class="token punctuation">,</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>anims<span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span><span class="token punctuation">(</span>anim<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token function">timing<span class="token punctuation">(</span></span>
anim<span class="token punctuation">,</span> <span class="token punctuation">{</span>toValue<span class="token punctuation">:</span> <span class="token number">200</span><span class="token punctuation">}</span>
<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">concat<span class="token punctuation">(</span></span>
<span class="token keyword">this</span><span class="token punctuation">.</span>anims<span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span><span class="token punctuation">(</span>anim<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token function">timing<span class="token punctuation">(</span></span>
anim<span class="token punctuation">,</span> <span class="token punctuation">{</span>toValue<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">}</span>
<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">)</span><span class="token punctuation">,</span>
Animated<span class="token punctuation">.</span><span class="token function">delay<span class="token punctuation">(</span></span><span class="token number">400</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
Animated<span class="token punctuation">.</span><span class="token function">parallel<span class="token punctuation">(</span></span><span class="token punctuation">[</span>
Easing<span class="token punctuation">.</span><span class="token function">inOut<span class="token punctuation">(</span></span>Easing<span class="token punctuation">.</span>quad<span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token comment" spellcheck="true"> // Symmetric
</span> Easing<span class="token punctuation">.</span><span class="token function">back<span class="token punctuation">(</span></span><span class="token number">1.5</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // Goes backwards first
</span> Easing<span class="token punctuation">.</span>ease <span class="token comment" spellcheck="true"> // Default bezier
</span> <span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span><span class="token punctuation">(</span>easing<span class="token punctuation">,</span> ii<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">(</span>
<span class="token function">timing<span class="token punctuation">(</span></span><span class="token keyword">this</span><span class="token punctuation">.</span>anims<span class="token punctuation">[</span>ii<span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
toValue<span class="token punctuation">:</span> <span class="token number">320</span><span class="token punctuation">,</span> easing<span class="token punctuation">,</span> duration<span class="token punctuation">:</span> <span class="token number">3000</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
Animated<span class="token punctuation">.</span><span class="token function">delay<span class="token punctuation">(</span></span><span class="token number">400</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
Animated<span class="token punctuation">.</span><span class="token function">stagger<span class="token punctuation">(</span></span><span class="token number">200</span><span class="token punctuation">,</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>anims<span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span><span class="token punctuation">(</span>anim<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token function">timing<span class="token punctuation">(</span></span>anim<span class="token punctuation">,</span> <span class="token punctuation">{</span>
toValue<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
easing<span class="token punctuation">:</span> Easing<span class="token punctuation">.</span>bounce<span class="token punctuation">,</span><span class="token comment" spellcheck="true"> // Like a ball
</span> duration<span class="token punctuation">:</span> <span class="token number">2000</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">start<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token operator">&gt;</span>
Press to Animate
&lt;<span class="token operator">/</span>UIExplorerButton<span class="token operator">&gt;</span>
<span class="token punctuation">{</span><span class="token punctuation">[</span><span class="token string">&#x27;Composite&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;Easing&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;Animations!&#x27;</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span>
<span class="token punctuation">(</span>text<span class="token punctuation">,</span> ii<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">(</span>
&lt;Animated<span class="token punctuation">.</span>View
style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">[</span>styles<span class="token punctuation">.</span>content<span class="token punctuation">,</span> <span class="token punctuation">{</span>
left<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>anims<span class="token punctuation">[</span>ii<span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">}</span><span class="token operator">&gt;</span>
&lt;Text<span class="token operator">&gt;</span><span class="token punctuation">{</span>text<span class="token punctuation">}</span>&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;<span class="token operator">/</span>Animated<span class="token punctuation">.</span>View<span class="token operator">&gt;</span>
<span class="token punctuation">)</span>
<span class="token punctuation">)</span><span class="token punctuation">}</span>
&lt;<span class="token operator">/</span>View<span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span>
title<span class="token punctuation">:</span> <span class="token string">&#x27;Continuous Interactions&#x27;</span><span class="token punctuation">,</span>
description<span class="token punctuation">:</span> <span class="token string">&#x27;Gesture events, chaining, 2D &#x27;</span> <span class="token operator">+</span>
<span class="token string">&#x27;values, interrupting and transitioning &#x27;</span> <span class="token operator">+</span>
<span class="token string">&#x27;animations, etc.&#x27;</span><span class="token punctuation">,</span>
render<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">(</span>
&lt;Text<span class="token operator">&gt;</span>Checkout the Gratuitous Animation App<span class="token operator">!</span>&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span>
<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> styles <span class="token operator">=</span> StyleSheet<span class="token punctuation">.</span><span class="token function">create<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
content<span class="token punctuation">:</span> <span class="token punctuation">{</span>
backgroundColor<span class="token punctuation">:</span> <span class="token string">&#x27;deepskyblue&#x27;</span><span class="token punctuation">,</span>
borderWidth<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
borderColor<span class="token punctuation">:</span> <span class="token string">&#x27;dodgerblue&#x27;</span><span class="token punctuation">,</span>
padding<span class="token punctuation">:</span> <span class="token number">20</span><span class="token punctuation">,</span>
margin<span class="token punctuation">:</span> <span class="token number">20</span><span class="token punctuation">,</span>
borderRadius<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">,</span>
alignItems<span class="token punctuation">:</span> <span class="token string">&#x27;center&#x27;</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div></div><div class="docs-prevnext"><a class="docs-next" href="appregistry.html#content">Next →</a></div></div></section><footer class="wrap"><div class="right">© 2015 Facebook Inc.</div></footer></div><div id="fb-root"></div><script>
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