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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>AnimatedValue · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="Standard value for driving animations. One `Animated.Value` 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 `setValue`) will stop any previous ones."/><meta name="docsearch:version" content="0.5"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="AnimatedValue · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://reactnative.dev/"/><meta property="og:description" content="Standard value for driving animations. One `Animated.Value` 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 `setValue`) will stop any previous ones."/><meta property="og:image" content="https://reactnative.dev/img/logo-og.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://reactnative.dev/img/logo-og.png"/><link rel="shortcut icon" href="/img/favicon.ico"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://reactnative.dev/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://reactnative.dev/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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</script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/prism.css"/><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/"><img class="logo" src="/img/header_logo.svg" alt="React Native"/><h2 class="headerTitleWithLogo">React Native</h2></a><a href="/versions"><h3>0.5</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class=""><a href="/docs/0.5/getting-started" target="_self">Docs</a></li><li class=""><a href="/docs/0.5/components-and-apis" target="_self">Components</a></li><li class=""><a href="/docs/0.5/accessibilityinfo" target="_self">API</a></li><li class=""><a href="/help" target="_self">Community</a></li><li class=""><a href="/blog/" target="_self">Blog</a></li><li class="navSearchWrapper reactNavSearchWrapper"><input type="text" id="search_input_react" placeholder="Search" title="Search"/></li><li class=""><a href="https://github.com/facebook/react-native" target="_self">GitHub</a></li></ul></nav></div></header></div></div><div class="navPusher"><div class="docMainWrapper wrapper"><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/react-native-website/blob/master/docs/animatedvalue.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">AnimatedValue</h1></header><article><div><span><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>
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<p>Typically initialized with <code>new Animated.Value(0);</code></p>
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<p>See also <a href="/docs/0.5/animated"><code>Animated</code></a>.</p>
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<h3><a class="anchor" aria-hidden="true" id="methods"></a><a href="#methods" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Methods</h3>
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<ul>
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<li><a href="/docs/0.5/animatedvalue#setvalue"><code>setValue</code></a></li>
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<li><a href="/docs/0.5/animatedvalue#setoffset"><code>setOffset</code></a></li>
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<li><a href="/docs/0.5/animatedvalue#flattenoffset"><code>flattenOffset</code></a></li>
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<li><a href="/docs/0.5/animatedvalue#extractoffset"><code>extractOffset</code></a></li>
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<li><a href="/docs/0.5/animatedvalue#addlistener"><code>addListener</code></a></li>
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<li><a href="/docs/0.5/animatedvalue#removelistener"><code>removeListener</code></a></li>
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<li><a href="/docs/0.5/animatedvalue#removealllisteners"><code>removeAllListeners</code></a></li>
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<li><a href="/docs/0.5/animatedvalue#stopanimation"><code>stopAnimation</code></a></li>
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<li><a href="/docs/0.5/animatedvalue#resetanimation"><code>resetAnimation</code></a></li>
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<li><a href="/docs/0.5/animatedvalue#interpolate"><code>interpolate</code></a></li>
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<li><a href="/docs/0.5/animatedvalue#animate"><code>animate</code></a></li>
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<li><a href="/docs/0.5/animatedvalue#stoptracking"><code>stopTracking</code></a></li>
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<li><a href="/docs/0.5/animatedvalue#track"><code>track</code></a></li>
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</ul>
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<hr>
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<h1><a class="anchor" aria-hidden="true" id="reference"></a><a href="#reference" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reference</h1>
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<h2><a class="anchor" aria-hidden="true" id="methods-1"></a><a href="#methods-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Methods</h2>
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<h3><a class="anchor" aria-hidden="true" id="setvalue"></a><a href="#setvalue" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>setValue()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">setValue</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<p>Directly set the value. This will stop any animations running on the value and update all the bound properties.</p>
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<p><strong>Parameters:</strong></p>
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<table>
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<thead>
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<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
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</thead>
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<tbody>
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<tr><td>value</td><td>number</td><td>Yes</td><td>Value</td></tr>
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</tbody>
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</table>
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<hr>
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<h3><a class="anchor" aria-hidden="true" id="setoffset"></a><a href="#setoffset" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>setOffset()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">setOffset</span><span class="token punctuation">(</span>offset<span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<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>
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<p><strong>Parameters:</strong></p>
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<table>
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<thead>
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<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
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</thead>
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<tbody>
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<tr><td>offset</td><td>number</td><td>Yes</td><td>Offset value</td></tr>
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</tbody>
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</table>
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<hr>
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<h3><a class="anchor" aria-hidden="true" id="flattenoffset"></a><a href="#flattenoffset" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>flattenOffset()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">flattenOffset</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<p>Merges the offset value into the base value and resets the offset to zero. The final output of the value is unchanged.</p>
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<hr>
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<h3><a class="anchor" aria-hidden="true" id="extractoffset"></a><a href="#extractoffset" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>extractOffset()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">extractOffset</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<p>Sets the offset value to the base value, and resets the base value to zero. The final output of the value is unchanged.</p>
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<hr>
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<h3><a class="anchor" aria-hidden="true" id="addlistener"></a><a href="#addlistener" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>addListener()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">addListener</span><span class="token punctuation">(</span>callback<span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<p>Adds an asynchronous listener to the value so you can observe updates from animations. This is useful because there is no way to synchronously read the value because it might be driven natively.</p>
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<p>Returns a string that serves as an identifier for the listener.</p>
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<p><strong>Parameters:</strong></p>
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<table>
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<thead>
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<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
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</thead>
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<tbody>
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<tr><td>callback</td><td>function</td><td>Yes</td><td>The callback function which will receive an object with a <code>value</code> key set to the new value.</td></tr>
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</tbody>
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</table>
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<hr>
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<h3><a class="anchor" aria-hidden="true" id="removelistener"></a><a href="#removelistener" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>removeListener()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">removeListener</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<p>Unregister a listener. The <code>id</code> param shall match the identifier previously returned by <code>addListener()</code>.</p>
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<p><strong>Parameters:</strong></p>
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<table>
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<thead>
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<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
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</thead>
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<tbody>
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<tr><td>id</td><td>string</td><td>Yes</td><td>Id for the listener being removed.</td></tr>
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</tbody>
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</table>
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<hr>
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<h3><a class="anchor" aria-hidden="true" id="removealllisteners"></a><a href="#removealllisteners" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>removeAllListeners()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">removeAllListeners</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<p>Remove all registered listeners.</p>
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<hr>
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<h3><a class="anchor" aria-hidden="true" id="stopanimation"></a><a href="#stopanimation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>stopAnimation()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">stopAnimation</span><span class="token punctuation">(</span><span class="token punctuation">[</span>callback<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<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>
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<p><strong>Parameters:</strong></p>
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<table>
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<thead>
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<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
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</thead>
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<tbody>
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<tr><td>callback</td><td>function</td><td>No</td><td>A function that will receive the final value.</td></tr>
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</tbody>
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</table>
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<hr>
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<h3><a class="anchor" aria-hidden="true" id="resetanimation"></a><a href="#resetanimation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>resetAnimation()</code></h3>
|
|
<pre><code class="hljs css language-jsx"><span class="token function">resetAnimation</span><span class="token punctuation">(</span><span class="token punctuation">[</span>callback<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
<p>Stops any animation and resets the value to its original.</p>
|
|
<p><strong>Parameters:</strong></p>
|
|
<table>
|
|
<thead>
|
|
<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr><td>callback</td><td>function</td><td>No</td><td>A function that will receive the original value.</td></tr>
|
|
</tbody>
|
|
</table>
|
|
<hr>
|
|
<h3><a class="anchor" aria-hidden="true" id="interpolate"></a><a href="#interpolate" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>interpolate()</code></h3>
|
|
<pre><code class="hljs css language-jsx"><span class="token function">interpolate</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
<p>Interpolates the value before updating the property, e.g. mapping 0-1 to 0-10.</p>
|
|
<p>See <code>AnimatedInterpolation.js</code></p>
|
|
<p><strong>Parameters:</strong></p>
|
|
<table>
|
|
<thead>
|
|
<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr><td>config</td><td>object</td><td>Yes</td><td>See below.</td></tr>
|
|
</tbody>
|
|
</table>
|
|
<p>The <code>config</code> object is composed of the following keys:</p>
|
|
<ul>
|
|
<li><code>inputRange</code>: an array of numbers</li>
|
|
<li><code>outputRange</code>: an array of numbers or strings</li>
|
|
<li><code>easing</code> (optional): a function that returns a number, given an input number</li>
|
|
<li><code>extrapolate</code> (optional): a string such as 'extend', 'identity', or 'clamp'</li>
|
|
<li><code>extrapolateLeft</code> (optional): a string such as 'extend', 'identity', or 'clamp'</li>
|
|
<li><code>extrapolateRight</code> (optional): a string such as 'extend', 'identity', or 'clamp'</li>
|
|
</ul>
|
|
<hr>
|
|
<h3><a class="anchor" aria-hidden="true" id="animate"></a><a href="#animate" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>animate()</code></h3>
|
|
<pre><code class="hljs css language-jsx"><span class="token function">animate</span><span class="token punctuation">(</span>animation<span class="token punctuation">,</span> callback<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
<p>Typically only used internally, but could be used by a custom Animation class.</p>
|
|
<p><strong>Parameters:</strong></p>
|
|
<table>
|
|
<thead>
|
|
<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr><td>animation</td><td>Animation</td><td>Yes</td><td>See <code>Animation.js</code>.</td></tr>
|
|
<tr><td>callback</td><td>function</td><td>Yes</td><td>Callback function.</td></tr>
|
|
</tbody>
|
|
</table>
|
|
<hr>
|
|
<h3><a class="anchor" aria-hidden="true" id="stoptracking"></a><a href="#stoptracking" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>stopTracking()</code></h3>
|
|
<pre><code class="hljs css language-jsx"><span class="token function">stopTracking</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
<p>Typically only used internally.</p>
|
|
<hr>
|
|
<h3><a class="anchor" aria-hidden="true" id="track"></a><a href="#track" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>track()</code></h3>
|
|
<pre><code class="hljs css language-jsx"><span class="token function">track</span><span class="token punctuation">(</span>tracking<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
<p>Typically only used internally.</p>
|
|
<p><strong>Parameters:</strong></p>
|
|
<table>
|
|
<thead>
|
|
<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr><td>tracking</td><td>AnimatedNode</td><td>Yes</td><td>See <code>AnimatedNode.js</code></td></tr>
|
|
</tbody>
|
|
</table>
|
|
</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#methods-1">Methods</a><ul class="toc-headings"><li><a href="#setvalue"><code>setValue()</code></a></li><li><a href="#setoffset"><code>setOffset()</code></a></li><li><a href="#flattenoffset"><code>flattenOffset()</code></a></li><li><a href="#extractoffset"><code>extractOffset()</code></a></li><li><a href="#addlistener"><code>addListener()</code></a></li><li><a href="#removelistener"><code>removeListener()</code></a></li><li><a href="#removealllisteners"><code>removeAllListeners()</code></a></li><li><a href="#stopanimation"><code>stopAnimation()</code></a></li><li><a href="#resetanimation"><code>resetAnimation()</code></a></li><li><a href="#interpolate"><code>interpolate()</code></a></li><li><a href="#animate"><code>animate()</code></a></li><li><a href="#stoptracking"><code>stopTracking()</code></a></li><li><a href="#track"><code>track()</code></a></li></ul></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><div><h5>Docs</h5><a href="/docs/getting-started">Getting Started</a><a href="/docs/tutorial">Tutorial</a><a href="/docs/components-and-apis">Components and APIs</a><a href="/docs/more-resources">More Resources</a></div><div><h5>Community</h5><a href="/help">The React Native Community</a><a href="/showcase">Who's using React Native?</a><a href="https://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a><a href="https://dev.to/t/reactnative" target="_blank">DEV Community</a></div><div><h5>More Resources</h5><a href="/blog">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="https://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2020 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>window.fbAsyncInit = function() {FB.init({appId:'1677033832619985',xfbml:true,version:'v2.7'});};(function(d, s, id){var js, fjs = d.getElementsByTagName(s)[0];if (d.getElementById(id)) {return;}js = d.createElement(s); js.id = id;js.src = '//connect.facebook.net/en_US/sdk.js';fjs.parentNode.insertBefore(js, fjs);}(document, 'script','facebook-jssdk'));
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