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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>PanResponder · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="`PanResponder` reconciles several touches into a single gesture. It makes single-touch gestures resilient to extra touches, and can be used to recognize basic multi-touch gestures."/><meta name="docsearch:version" content="0.62"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="PanResponder · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://reactnative.dev/"/><meta property="og:description" content="`PanResponder` reconciles several touches into a single gesture. It makes single-touch gestures resilient to extra touches, and can be used to recognize basic multi-touch gestures."/><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></nav></div><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/panresponder.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">PanResponder</h1></header><article><div><span><p><code>PanResponder</code> reconciles several touches into a single gesture. It makes single-touch gestures resilient to extra touches, and can be used to recognize basic multi-touch gestures.</p>
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<p>By default, <code>PanResponder</code> holds an <code>InteractionManager</code> handle to block long-running JS events from interrupting active gestures.</p>
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<p>It provides a predictable wrapper of the responder handlers provided by the <a href="/docs/gesture-responder-system">gesture responder system</a>. For each handler, it provides a new <code>gestureState</code> object alongside the native event object:</p>
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<pre><code class="hljs">onPanResponderMove: <span class="hljs-function"><span class="hljs-params">(event, gestureState)</span> =></span> {}
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</code></pre>
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<p>A native event is a synthetic touch event with the following form:</p>
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<ul>
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<li><code>nativeEvent</code>
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<ul>
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<li><code>changedTouches</code> - Array of all touch events that have changed since the last event</li>
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<li><code>identifier</code> - The ID of the touch</li>
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<li><code>locationX</code> - The X position of the touch, relative to the element</li>
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<li><code>locationY</code> - The Y position of the touch, relative to the element</li>
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<li><code>pageX</code> - The X position of the touch, relative to the root element</li>
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<li><code>pageY</code> - The Y position of the touch, relative to the root element</li>
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<li><code>target</code> - The node id of the element receiving the touch event</li>
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<li><code>timestamp</code> - A time identifier for the touch, useful for velocity calculation</li>
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<li><code>touches</code> - Array of all current touches on the screen</li>
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</ul></li>
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</ul>
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<p>A <code>gestureState</code> object has the following:</p>
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<ul>
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<li><code>stateID</code> - ID of the gestureState- persisted as long as there at least one touch on screen</li>
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<li><code>moveX</code> - the latest screen coordinates of the recently-moved touch</li>
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<li><code>moveY</code> - the latest screen coordinates of the recently-moved touch</li>
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<li><code>x0</code> - the screen coordinates of the responder grant</li>
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<li><code>y0</code> - the screen coordinates of the responder grant</li>
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<li><code>dx</code> - accumulated distance of the gesture since the touch started</li>
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<li><code>dy</code> - accumulated distance of the gesture since the touch started</li>
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<li><code>vx</code> - current velocity of the gesture</li>
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<li><code>vy</code> - current velocity of the gesture</li>
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<li><code>numberActiveTouches</code> - Number of touches currently on screen</li>
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</ul>
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<h2><a class="anchor" aria-hidden="true" id="usage-pattern"></a><a href="#usage-pattern" 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>Usage Pattern</h2>
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<pre><code class="hljs css language-jsx"><span class="token keyword">const</span> <span class="token function-variable function">ExampleComponent</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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<span class="token keyword">const</span> panResponder <span class="token operator">=</span> React<span class="token punctuation">.</span><span class="token function">useRef</span><span class="token punctuation">(</span>
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PanResponder<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
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<span class="token comment">// Ask to be the responder:</span>
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<span class="token function-variable function">onStartShouldSetPanResponder</span><span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token parameter">evt<span class="token punctuation">,</span> gestureState</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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<span class="token function-variable function">onStartShouldSetPanResponderCapture</span><span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token parameter">evt<span class="token punctuation">,</span> gestureState</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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<span class="token function-variable function">onMoveShouldSetPanResponder</span><span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token parameter">evt<span class="token punctuation">,</span> gestureState</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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<span class="token function-variable function">onMoveShouldSetPanResponderCapture</span><span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token parameter">evt<span class="token punctuation">,</span> gestureState</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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<span class="token function-variable function">onPanResponderGrant</span><span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token parameter">evt<span class="token punctuation">,</span> gestureState</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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<span class="token comment">// The gesture has started. Show visual feedback so the user knows</span>
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<span class="token comment">// what is happening!</span>
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<span class="token comment">// gestureState.d{x,y} will be set to zero now</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token function-variable function">onPanResponderMove</span><span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token parameter">evt<span class="token punctuation">,</span> gestureState</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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<span class="token comment">// The most recent move distance is gestureState.move{X,Y}</span>
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<span class="token comment">// The accumulated gesture distance since becoming responder is</span>
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<span class="token comment">// gestureState.d{x,y}</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token function-variable function">onPanResponderTerminationRequest</span><span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token parameter">evt<span class="token punctuation">,</span> gestureState</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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<span class="token function-variable function">onPanResponderRelease</span><span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token parameter">evt<span class="token punctuation">,</span> gestureState</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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<span class="token comment">// The user has released all touches while this view is the</span>
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<span class="token comment">// responder. This typically means a gesture has succeeded</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token function-variable function">onPanResponderTerminate</span><span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token parameter">evt<span class="token punctuation">,</span> gestureState</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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<span class="token comment">// Another component has become the responder, so this gesture</span>
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<span class="token comment">// should be cancelled</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token function-variable function">onShouldBlockNativeResponder</span><span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token parameter">evt<span class="token punctuation">,</span> gestureState</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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<span class="token comment">// Returns whether this component should block native components from becoming the JS</span>
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<span class="token comment">// responder. Returns true by default. Is currently only supported on android.</span>
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<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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||
<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>
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||
<span class="token punctuation">)</span><span class="token punctuation">.</span>current<span class="token punctuation">;</span>
|
||
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<span class="token keyword">return</span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span><span class="token class-name">View</span></span> <span class="token spread"><span class="token punctuation">{</span><span class="token punctuation">...</span><span class="token attr-value">panResponder</span><span class="token punctuation">.</span><span class="token attr-value">panHandlers</span><span class="token punctuation">}</span></span> <span class="token punctuation">/></span></span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">;</span>
|
||
</code></pre>
|
||
<h2><a class="anchor" aria-hidden="true" id="example"></a><a href="#example" 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>Example</h2>
|
||
<p><code>PanResponder</code> works with <code>Animated</code> API to help build complex gestures in the UI. The following example contains an animated <code>View</code> component which can be dragged freely across the screen</p>
|
||
<div class="toggler">
|
||
<ul role="tablist" class="toggle-syntax">
|
||
<li id="functional" class="button-functional" aria-selected="false" role="tab" tabindex="0" aria-controls="functionaltab" onclick="displayTabs('syntax', 'functional')">
|
||
Function Component Example
|
||
</li>
|
||
<li id="classical" class="button-classical" aria-selected="false" role="tab" tabindex="0" aria-controls="classicaltab" onclick="displayTabs('syntax', 'classical')">
|
||
Class Component Example
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<p><block class="functional syntax" /></p>
|
||
<div class="snack-player"><div class="mobile-friendly-snack" style="display: none"><pre><code class="hljs css javascript"><span class="hljs-keyword">import</span> React, { useRef } <span class="hljs-keyword">from</span> <span class="hljs-string">"react"</span>;
|
||
<span class="hljs-keyword">import</span> { Animated, View, StyleSheet, PanResponder, Text } <span class="hljs-keyword">from</span> <span class="hljs-string">"react-native"</span>;
|
||
|
||
<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">App</span>(<span class="hljs-params"></span>) </span>{
|
||
|
||
<span class="hljs-keyword">const</span> pan = useRef(<span class="hljs-keyword">new</span> Animated.ValueXY()).current;
|
||
|
||
<span class="hljs-keyword">const</span> panResponder = useRef(
|
||
PanResponder.create({
|
||
<span class="hljs-attr">onMoveShouldSetPanResponder</span>: <span class="hljs-function"><span class="hljs-params">()</span> =></span> <span class="hljs-literal">true</span>,
|
||
<span class="hljs-attr">onPanResponderGrant</span>: <span class="hljs-function"><span class="hljs-params">()</span> =></span> {
|
||
pan.setOffset({
|
||
<span class="hljs-attr">x</span>: pan.x._value,
|
||
<span class="hljs-attr">y</span>: pan.y._value
|
||
});
|
||
},
|
||
<span class="hljs-attr">onPanResponderMove</span>: Animated.event(
|
||
[
|
||
<span class="hljs-literal">null</span>,
|
||
{ <span class="hljs-attr">dx</span>: pan.x, <span class="hljs-attr">dy</span>: pan.y }
|
||
]
|
||
),
|
||
<span class="hljs-attr">onPanResponderRelease</span>: <span class="hljs-function"><span class="hljs-params">()</span> =></span> {
|
||
pan.flattenOffset();
|
||
}
|
||
})
|
||
).current;
|
||
|
||
<span class="hljs-keyword">return</span> (
|
||
<span class="xml"><span class="hljs-tag"><<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{styles.container}</span>></span>
|
||
<span class="hljs-tag"><<span class="hljs-name">Text</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{styles.titleText}</span>></span>Drag this box!<span class="hljs-tag"></<span class="hljs-name">Text</span>></span>
|
||
<span class="hljs-tag"><<span class="hljs-name">Animated.View</span>
|
||
<span class="hljs-attr">style</span>=<span class="hljs-string">{{</span>
|
||
<span class="hljs-attr">transform:</span> [{ <span class="hljs-attr">translateX:</span> <span class="hljs-attr">pan.x</span> }, { <span class="hljs-attr">translateY:</span> <span class="hljs-attr">pan.y</span> }]
|
||
}}
|
||
{<span class="hljs-attr">...panResponder.panHandlers</span>}
|
||
></span>
|
||
<span class="hljs-tag"><<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{styles.box}</span> /></span>
|
||
<span class="hljs-tag"></<span class="hljs-name">Animated.View</span>></span>
|
||
<span class="hljs-tag"></<span class="hljs-name">View</span>></span>
|
||
);
|
||
}
|
||
|
||
const styles = StyleSheet.create({
|
||
container: {
|
||
flex: 1,
|
||
alignItems: "center",
|
||
justifyContent: "center"
|
||
},
|
||
titleText: {
|
||
fontSize: 14,
|
||
lineHeight: 24,
|
||
fontWeight: "bold"
|
||
},
|
||
box: {
|
||
height: 150,
|
||
width: 150,
|
||
backgroundColor: "blue",
|
||
borderRadius: 5
|
||
}
|
||
});
|
||
</span></code></pre></div><div class="desktop-friendly-snack" style="margin-top: 15px; margin-bottom: 15px"><div
|
||
data-snack-name="PanResponder"
|
||
data-snack-description="Example usage"
|
||
data-snack-code="import%20React%2C%20%7B%20useRef%20%7D%20from%20%22react%22%3B%0Aimport%20%7B%20Animated%2C%20View%2C%20StyleSheet%2C%20PanResponder%2C%20Text%20%7D%20from%20%22react-native%22%3B%0A%0Aexport%20default%20function%20App()%20%7B%0A%0A%20%20const%20pan%20%3D%20useRef(new%20Animated.ValueXY()).current%3B%0A%0A%20%20const%20panResponder%20%3D%20useRef(%0A%20%20%20%20PanResponder.create(%7B%0A%20%20%20%20%20%20onMoveShouldSetPanResponder%3A%20()%20%3D%3E%20true%2C%0A%20%20%20%20%20%20onPanResponderGrant%3A%20()%20%3D%3E%20%7B%0A%20%20%20%20%20%20%20%20pan.setOffset(%7B%0A%20%20%20%20%20%20%20%20%20%20x%3A%20pan.x._value%2C%0A%20%20%20%20%20%20%20%20%20%20y%3A%20pan.y._value%0A%20%20%20%20%20%20%20%20%7D)%3B%0A%20%20%20%20%20%20%7D%2C%0A%20%20%20%20%20%20onPanResponderMove%3A%20Animated.event(%0A%20%20%20%20%20%20%20%20%5B%0A%20%20%20%20%20%20%20%20%20%20null%2C%0A%20%20%20%20%20%20%20%20%20%20%7B%20dx%3A%20pan.x%2C%20dy%3A%20pan.y%20%7D%0A%20%20%20%20%20%20%20%20%5D%0A%20%20%20%20%20%20)%2C%0A%20%20%20%20%20%20onPanResponderRelease%3A%20()%20%3D%3E%20%7B%0A%20%20%20%20%20%20%20%20pan.flattenOffset()%3B%0A%20%20%20%20%20%20%7D%0A%20%20%20%20%7D)%0A%20%20).current%3B%0A%0A%20%20return%20(%0A%20%20%20%20%3CView%20style%3D%7Bstyles.container%7D%3E%0A%20%20%20%20%20%20%3CText%20style%3D%7Bstyles.titleText%7D%3EDrag%20this%20box!%3C%2FText%3E%0A%20%20%20%20%20%20%3CAnimated.View%0A%20%20%20%20%20%20%20%20style%3D%7B%7B%0A%20%20%20%20%20%20%20%20%20%20transform%3A%20%5B%7B%20translateX%3A%20pan.x%20%7D%2C%20%7B%20translateY%3A%20pan.y%20%7D%5D%0A%20%20%20%20%20%20%20%20%7D%7D%0A%20%20%20%20%20%20%20%20%7B...panResponder.panHandlers%7D%0A%20%20%20%20%20%20%3E%0A%20%20%20%20%20%20%20%20%3CView%20style%3D%7Bstyles.box%7D%20%2F%3E%0A%20%20%20%20%20%20%3C%2FAnimated.View%3E%0A%20%20%20%20%3C%2FView%3E%0A%20%20)%3B%0A%7D%0A%0Aconst%20styles%20%3D%20StyleSheet.create(%7B%0A%20%20container%3A%20%7B%0A%20%20%20%20flex%3A%201%2C%0A%20%20%20%20alignItems%3A%20%22center%22%2C%0A%20%20%20%20justifyContent%3A%20%22center%22%0A%20%20%7D%2C%0A%20%20titleText%3A%20%7B%0A%20%20%20%20fontSize%3A%2014%2C%0A%20%20%20%20lineHeight%3A%2024%2C%0A%20%20%20%20fontWeight%3A%20%22bold%22%0A%20%20%7D%2C%0A%20%20box%3A%20%7B%0A%20%20%20%20height%3A%20150%2C%0A%20%20%20%20width%3A%20150%2C%0A%20%20%20%20backgroundColor%3A%20%22blue%22%2C%0A%20%20%20%20borderRadius%3A%205%0A%20%20%7D%0A%7D)%3B%0A"
|
||
data-snack-platform="web"
|
||
data-snack-supported-platforms=ios,android,web
|
||
data-snack-preview="true"
|
||
style="
|
||
overflow: hidden;
|
||
background: #fafafa;
|
||
border: 1px solid rgba(0,0,0,.16);
|
||
border-radius: 4px;
|
||
height: 514px;
|
||
width: 100%;
|
||
"
|
||
></div></div></div><p><block class="classical syntax" /></p>
|
||
<div class="snack-player"><div class="mobile-friendly-snack" style="display: none"><pre><code class="hljs css javascript"><span class="hljs-keyword">import</span> React, { Component } <span class="hljs-keyword">from</span> <span class="hljs-string">"react"</span>;
|
||
<span class="hljs-keyword">import</span> { Animated, View, StyleSheet, PanResponder, Text } <span class="hljs-keyword">from</span> <span class="hljs-string">"react-native"</span>;
|
||
|
||
<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">App</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Component</span> </span>{
|
||
pan = <span class="hljs-keyword">new</span> Animated.ValueXY();
|
||
panResponder = PanResponder.create({
|
||
<span class="hljs-attr">onMoveShouldSetPanResponder</span>: <span class="hljs-function"><span class="hljs-params">()</span> =></span> <span class="hljs-literal">true</span>,
|
||
<span class="hljs-attr">onPanResponderGrant</span>: <span class="hljs-function"><span class="hljs-params">()</span> =></span> {
|
||
<span class="hljs-keyword">this</span>.pan.setOffset({
|
||
<span class="hljs-attr">x</span>: <span class="hljs-keyword">this</span>.pan.x._value,
|
||
<span class="hljs-attr">y</span>: <span class="hljs-keyword">this</span>.pan.y._value
|
||
});
|
||
},
|
||
<span class="hljs-attr">onPanResponderMove</span>: Animated.event([
|
||
<span class="hljs-literal">null</span>,
|
||
{ <span class="hljs-attr">dx</span>: <span class="hljs-keyword">this</span>.pan.x, <span class="hljs-attr">dy</span>: <span class="hljs-keyword">this</span>.pan.y }
|
||
]),
|
||
<span class="hljs-attr">onPanResponderRelease</span>: <span class="hljs-function"><span class="hljs-params">()</span> =></span> {
|
||
<span class="hljs-keyword">this</span>.pan.flattenOffset();
|
||
}
|
||
});
|
||
|
||
render() {
|
||
<span class="hljs-keyword">return</span> (
|
||
<span class="xml"><span class="hljs-tag"><<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{styles.container}</span>></span>
|
||
<span class="hljs-tag"><<span class="hljs-name">Text</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{styles.titleText}</span>></span>Drag this box!<span class="hljs-tag"></<span class="hljs-name">Text</span>></span>
|
||
<span class="hljs-tag"><<span class="hljs-name">Animated.View</span>
|
||
<span class="hljs-attr">style</span>=<span class="hljs-string">{{</span>
|
||
<span class="hljs-attr">transform:</span> [{ <span class="hljs-attr">translateX:</span> <span class="hljs-attr">this.pan.x</span> }, { <span class="hljs-attr">translateY:</span> <span class="hljs-attr">this.pan.y</span> }]
|
||
}}
|
||
{<span class="hljs-attr">...this.panResponder.panHandlers</span>}
|
||
></span>
|
||
<span class="hljs-tag"><<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{styles.box}</span> /></span>
|
||
<span class="hljs-tag"></<span class="hljs-name">Animated.View</span>></span>
|
||
<span class="hljs-tag"></<span class="hljs-name">View</span>></span>
|
||
);
|
||
}
|
||
}
|
||
|
||
const styles = StyleSheet.create({
|
||
container: {
|
||
flex: 1,
|
||
alignItems: "center",
|
||
justifyContent: "center"
|
||
},
|
||
titleText: {
|
||
fontSize: 14,
|
||
lineHeight: 24,
|
||
fontWeight: "bold"
|
||
},
|
||
box: {
|
||
height: 150,
|
||
width: 150,
|
||
backgroundColor: "blue",
|
||
borderRadius: 5
|
||
}
|
||
});
|
||
</span></code></pre></div><div class="desktop-friendly-snack" style="margin-top: 15px; margin-bottom: 15px"><div
|
||
data-snack-name="PanResponder"
|
||
data-snack-description="Example usage"
|
||
data-snack-code="import%20React%2C%20%7B%20Component%20%7D%20from%20%22react%22%3B%0Aimport%20%7B%20Animated%2C%20View%2C%20StyleSheet%2C%20PanResponder%2C%20Text%20%7D%20from%20%22react-native%22%3B%0A%0Aexport%20default%20class%20App%20extends%20Component%20%7B%0A%20%20pan%20%3D%20new%20Animated.ValueXY()%3B%0A%20%20panResponder%20%3D%20PanResponder.create(%7B%0A%20%20%20%20onMoveShouldSetPanResponder%3A%20()%20%3D%3E%20true%2C%0A%20%20%20%20onPanResponderGrant%3A%20()%20%3D%3E%20%7B%0A%20%20%20%20%20%20this.pan.setOffset(%7B%0A%20%20%20%20%20%20%20%20x%3A%20this.pan.x._value%2C%0A%20%20%20%20%20%20%20%20y%3A%20this.pan.y._value%0A%20%20%20%20%20%20%7D)%3B%0A%20%20%20%20%7D%2C%0A%20%20%20%20onPanResponderMove%3A%20Animated.event(%5B%0A%20%20%20%20%20%20null%2C%0A%20%20%20%20%20%20%7B%20dx%3A%20this.pan.x%2C%20dy%3A%20this.pan.y%20%7D%0A%20%20%20%20%5D)%2C%0A%20%20%20%20onPanResponderRelease%3A%20()%20%3D%3E%20%7B%0A%20%20%20%20%20%20this.pan.flattenOffset()%3B%0A%20%20%20%20%7D%0A%20%20%7D)%3B%0A%0A%20%20render()%20%7B%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CView%20style%3D%7Bstyles.container%7D%3E%0A%20%20%20%20%20%20%20%20%3CText%20style%3D%7Bstyles.titleText%7D%3EDrag%20this%20box!%3C%2FText%3E%0A%20%20%20%20%20%20%20%20%3CAnimated.View%0A%20%20%20%20%20%20%20%20%20%20style%3D%7B%7B%0A%20%20%20%20%20%20%20%20%20%20%20%20transform%3A%20%5B%7B%20translateX%3A%20this.pan.x%20%7D%2C%20%7B%20translateY%3A%20this.pan.y%20%7D%5D%0A%20%20%20%20%20%20%20%20%20%20%7D%7D%0A%20%20%20%20%20%20%20%20%20%20%7B...this.panResponder.panHandlers%7D%0A%20%20%20%20%20%20%20%20%3E%0A%20%20%20%20%20%20%20%20%20%20%3CView%20style%3D%7Bstyles.box%7D%20%2F%3E%0A%20%20%20%20%20%20%20%20%3C%2FAnimated.View%3E%0A%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20)%3B%0A%20%20%7D%0A%7D%0A%0Aconst%20styles%20%3D%20StyleSheet.create(%7B%0A%20%20container%3A%20%7B%0A%20%20%20%20flex%3A%201%2C%0A%20%20%20%20alignItems%3A%20%22center%22%2C%0A%20%20%20%20justifyContent%3A%20%22center%22%0A%20%20%7D%2C%0A%20%20titleText%3A%20%7B%0A%20%20%20%20fontSize%3A%2014%2C%0A%20%20%20%20lineHeight%3A%2024%2C%0A%20%20%20%20fontWeight%3A%20%22bold%22%0A%20%20%7D%2C%0A%20%20box%3A%20%7B%0A%20%20%20%20height%3A%20150%2C%0A%20%20%20%20width%3A%20150%2C%0A%20%20%20%20backgroundColor%3A%20%22blue%22%2C%0A%20%20%20%20borderRadius%3A%205%0A%20%20%7D%0A%7D)%3B%0A"
|
||
data-snack-platform="web"
|
||
data-snack-supported-platforms=ios,android,web
|
||
data-snack-preview="true"
|
||
style="
|
||
overflow: hidden;
|
||
background: #fafafa;
|
||
border: 1px solid rgba(0,0,0,.16);
|
||
border-radius: 4px;
|
||
height: 514px;
|
||
width: 100%;
|
||
"
|
||
></div></div></div><p><block class="endBlock syntax" /></p>
|
||
<p>Try the <a href="https://github.com/facebook/react-native/blob/master/RNTester/js/examples/PanResponder/PanResponderExample.js">PanResponder example in RNTester</a>.</p>
|
||
<hr>
|
||
<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>
|
||
<h2><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</h2>
|
||
<h3><a class="anchor" aria-hidden="true" id="create"></a><a href="#create" 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>create()</code></h3>
|
||
<pre><code class="hljs css language-jsx"><span class="token keyword">static</span> <span class="token function">create</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
|
||
</code></pre>
|
||
<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>Refer below</td></tr>
|
||
</tbody>
|
||
</table>
|
||
<p>The config object provides enhanced versions of all of the responder callbacks that provide not only the typical <code>ResponderSyntheticEvent</code>, but also the <code>PanResponder</code> gesture state, by replacing the word <code>Responder</code> with <code>PanResponder</code> in each of the typical <code>onResponder*</code> callbacks. For example, the <code>config</code> object would look like:</p>
|
||
<ul>
|
||
<li><code>onMoveShouldSetPanResponder: (e, gestureState) => {...}</code></li>
|
||
<li><code>onMoveShouldSetPanResponderCapture: (e, gestureState) => {...}</code></li>
|
||
<li><code>onStartShouldSetPanResponder: (e, gestureState) => {...}</code></li>
|
||
<li><code>onStartShouldSetPanResponderCapture: (e, gestureState) => {...}</code></li>
|
||
<li><code>onPanResponderReject: (e, gestureState) => {...}</code></li>
|
||
<li><code>onPanResponderGrant: (e, gestureState) => {...}</code></li>
|
||
<li><code>onPanResponderStart: (e, gestureState) => {...}</code></li>
|
||
<li><code>onPanResponderEnd: (e, gestureState) => {...}</code></li>
|
||
<li><code>onPanResponderRelease: (e, gestureState) => {...}</code></li>
|
||
<li><code>onPanResponderMove: (e, gestureState) => {...}</code></li>
|
||
<li><code>onPanResponderTerminate: (e, gestureState) => {...}</code></li>
|
||
<li><code>onPanResponderTerminationRequest: (e, gestureState) => {...}</code></li>
|
||
<li><code>onShouldBlockNativeResponder: (e, gestureState) => {...}</code></li>
|
||
</ul>
|
||
<p>In general, for events that have capture equivalents, we update the gestureState once in the capture phase and can use it in the bubble phase as well.</p>
|
||
<p>Be careful with <code>onStartShould*</code> callbacks. They only reflect updated <code>gestureState</code> for start/end events that bubble/capture to the Node. Once the node is the responder, you can rely on every start/end event being processed by the gesture and <code>gestureState</code> being updated accordingly. (numberActiveTouches) may not be totally accurate unless you are the responder.</p>
|
||
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