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<!DOCTYPE html><html><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><title>PanResponder – React Native | A framework for building native apps using React</title><meta name="viewport" content="width=device-width"><meta property="og:title" content="PanResponder – 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"><base href="/react-native/"><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"><link rel="shortcut icon" href="img/favicon.png?2"><link rel="stylesheet" href="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=""><img src="img/header_logo.png">React Native</a><a class="nav-version" href="/react-native/versions.html">0.19</a><div class="nav-site-wrapper"><ul class="nav-site nav-site-internal"><li><a href="docs/getting-started.html" class="active">Docs</a></li><li><a href="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="showcase.html" class="">Showcase</a></li></ul><div class="algolia-search-wrapper"><input id="algolia-doc-search" type="text" placeholder="Search docs..."></div><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="docs/getting-started.html#content">Getting Started</a></li><li><a style="margin-left:0;" class="" href="docs/android-setup.html#content">Android Setup</a></li><li><a style="margin-left:0;" class="" href="docs/linux-windows-support.html#content">Linux and Windows Support</a></li><li><a style="margin-left:0;" class="" href="docs/tutorial.html#content">Tutorial</a></li><li><a style="margin-left:0;" class="" href="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="docs/style.html#content">Style</a></li><li><a style="margin-left:0;" class="" href="docs/images.html#content">Images</a></li><li><a style="margin-left:0;" class="" href="docs/gesture-responder-system.html#content">Gesture Responder System</a></li><li><a style="margin-left:0;" class="" href="docs/animations.html#content">Animations</a></li><li><a style="margin-left:0;" class="" href="docs/accessibility.html#content">Accessibility</a></li><li><a style="margin-left:0;" class="" href="docs/direct-manipulation.html#content">Direct Manipulation</a></li><li><a style="margin-left:0;" class="" href="docs/debugging.html#content">Debugging</a></li><li><a style="margin-left:0;" class="" href="docs/testing.html#content">Testing</a></li><li><a style="margin-left:0;" class="" href="docs/javascript-environment.html#content">JavaScript Environment</a></li><li><a style="margin-left:0;" class="" href="docs/navigator-comparison.html#content">Navigator Comparison</a></li><li><a style="margin-left:0;" class="" href="docs/known-issues.html#content">Known Issues</a></li><li><a style="margin-left:0;" class="" href="docs/performance.html#content">Performance</a></li><li><a style="margin-left:0;" class="" href="docs/upgrading.html#content">Upgrading</a></li><li><a style="margin-left:0;" class="" href="docs/platform-specific-code.html#content">Platform Specific Code</a></li></ul></div><div class="nav-docs-section"><h3>Guides (iOS)</h3><ul><li><a style="margin-left:0;" class="" href="docs/native-modules-ios.html#content">Native Modules</a></li><li><a style="margin-left:0;" class="" href="docs/native-components-ios.html#content">Native UI Components</a></li><li><a style="margin-left:0;" class="" href="docs/linking-libraries-ios.html#content">Linking Libraries</a></li><li><a style="margin-left:0;" class="" href="docs/running-on-device-ios.html#content">Running On Device</a></li><li><a style="margin-left:0;" class="" href="docs/embedded-app-ios.html#content">Integrating with Existing Apps</a></li><li><a style="margin-left:0;" class="" href="docs/communication-ios.html#content">Communication between native and React Native</a></li></ul></div><div class="nav-docs-section"><h3>Guides (Android)</h3><ul><li><a style="margin-left:0;" class="" href="docs/native-modules-android.html#content">Native Modules</a></li><li><a style="margin-left:0;" class="" href="docs/native-components-android.html#content">Native UI Components</a></li><li><a style="margin-left:0;" class="" href="docs/running-on-device-android.html#content">Running On Device</a></li><li><a style="margin-left:0;" class="" href="docs/embedded-app-android.html#content">Integrating with Existing Apps</a></li><li><a style="margin-left:0;" class="" href="docs/signed-apk-android.html#content">Generating Signed APK</a></li><li><a style="margin-left:0;" class="" href="docs/android-ui-performance.html#content">Profiling Android UI Performance</a></li><li><a style="margin-left:0;" class="" href="docs/android-building-from-source.html#content">Building React Native from source</a></li></ul></div><div class="nav-docs-section"><h3>components</h3><ul><li><a style="margin-left:0;" class="" href="docs/activityindicatorios.html#content">ActivityIndicatorIOS</a></li><li><a style="margin-left:0;" class="" href="docs/datepickerios.html#content">DatePickerIOS</a></li><li><a style="margin-left:0;" class="" href="docs/drawerlayoutandroid.html#content">DrawerLayoutAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/image.html#content">Image</a></li><li><a style="margin-left:0;" class="" href="docs/listview.html#content">ListView</a></li><li><a style="margin-left:0;" class="" href="docs/mapview.html#content">MapView</a></li><li><a style="margin-left:0;" class="" href="docs/modal.html#content">Modal</a></li><li><a style="margin-left:0;" class="" href="docs/navigator.html#content">Navigator</a></li><li><a style="margin-left:0;" class="" href="docs/navigatorios.html#content">NavigatorIOS</a></li><li><a style="margin-left:0;" class="" href="docs/pickerios.html#content">PickerIOS</a></li><li><a style="margin-left:0;" class="" href="docs/progressbarandroid.html#content">ProgressBarAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/progressviewios.html#content">ProgressViewIOS</a></li><li><a style="margin-left:0;" class="" href="docs/pulltorefreshviewandroid.html#content">PullToRefreshViewAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/refreshcontrol.html#content">RefreshControl</a></li><li><a style="margin-left:0;" class="" href="docs/scrollview.html#content">ScrollView</a></li><li><a style="margin-left:0;" class="" href="docs/segmentedcontrolios.html#content">SegmentedControlIOS</a></li><li><a style="margin-left:0;" class="" href="docs/sliderios.html#content">SliderIOS</a></li><li><a style="margin-left:0;" class="" href="docs/switch.html#content">Switch</a></li><li><a style="margin-left:0;" class="" href="docs/tabbarios.html#content">TabBarIOS</a></li><li><a style="margin-left:0;" class="" href="docs/tabbarios-item.html#content">TabBarIOS.Item</a></li><li><a style="margin-left:0;" class="" href="docs/text.html#content">Text</a></li><li><a style="margin-left:0;" class="" href="docs/textinput.html#content">TextInput</a></li><li><a style="margin-left:0;" class="" href="docs/toolbarandroid.html#content">ToolbarAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/touchablehighlight.html#content">TouchableHighlight</a></li><li><a style="margin-left:0;" class="" href="docs/touchablenativefeedback.html#content">TouchableNativeFeedback</a></li><li><a style="margin-left:0;" class="" href="docs/touchableopacity.html#content">TouchableOpacity</a></li><li><a style="margin-left:0;" class="" href="docs/touchablewithoutfeedback.html#content">TouchableWithoutFeedback</a></li><li><a style="margin-left:0;" class="" href="docs/view.html#content">View</a></li><li><a style="margin-left:0;" class="" href="docs/viewpagerandroid.html#content">ViewPagerAndroid</a></li><li><a style="margin-left:0;" class="" href="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="docs/actionsheetios.html#content">ActionSheetIOS</a></li><li><a style="margin-left:0;" class="" href="docs/alert.html#content">Alert</a></li><li><a style="margin-left:0;" class="" href="docs/alertios.html#content">AlertIOS</a></li><li><a style="margin-left:0;" class="" href="docs/animated.html#content">Animated</a></li><li><a style="margin-left:0;" class="" href="docs/appregistry.html#content">AppRegistry</a></li><li><a style="margin-left:0;" class="" href="docs/appstateios.html#content">AppStateIOS</a></li><li><a style="margin-left:0;" class="" href="docs/appstate.html#content">AppState</a></li><li><a style="margin-left:0;" class="" href="docs/asyncstorage.html#content">AsyncStorage</a></li><li><a style="margin-left:0;" class="" href="docs/backandroid.html#content">BackAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/cameraroll.html#content">CameraRoll</a></li><li><a style="margin-left:0;" class="" href="docs/dimensions.html#content">Dimensions</a></li><li><a style="margin-left:0;" class="" href="docs/intentandroid.html#content">IntentAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/interactionmanager.html#content">InteractionManager</a></li><li><a style="margin-left:0;" class="" href="docs/layoutanimation.html#content">LayoutAnimation</a></li><li><a style="margin-left:0;" class="" href="docs/linkingios.html#content">LinkingIOS</a></li><li><a style="margin-left:0;" class="" href="docs/nativemethodsmixin.html#content">NativeMethodsMixin</a></li><li><a style="margin-left:0;" class="" href="docs/netinfo.html#content">NetInfo</a></li><li><a style="margin-left:0;" class="active" href="docs/panresponder.html#content">PanResponder</a></li><li><a style="margin-left:0;" class="" href="docs/pixelratio.html#content">PixelRatio</a></li><li><a style="margin-left:0;" class="" href="docs/pushnotificationios.html#content">PushNotificationIOS</a></li><li><a style="margin-left:0;" class="" href="docs/statusbarios.html#content">StatusBarIOS</a></li><li><a style="margin-left:0;" class="" href="docs/stylesheet.html#content">StyleSheet</a></li><li><a style="margin-left:0;" class="" href="docs/toastandroid.html#content">ToastAndroid</a></li><li><a style="margin-left:0;" class="" href="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="docs/flexbox.html#content">Flexbox</a></li><li><a style="margin-left:0;" class="" href="docs/geolocation.html#content">Geolocation</a></li><li><a style="margin-left:0;" class="" href="docs/network.html#content">Network</a></li><li><a style="margin-left:0;" class="" href="docs/timers.html#content">Timers</a></li></ul></div></div><div class="inner-content"><a id="content"></a><h1>PanResponder</h1><div><div><p><code>PanResponder</code> reconciles several touches into a single gesture. It makes
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single-touch gestures resilient to extra touches, and can be used to
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recognize simple multi-touch gestures.</p><p>It provides a predictable wrapper of the responder handlers provided by the
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<a href="docs/gesture-responder-system.html" target="_blank">gesture responder system</a>.
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For each handler, it provides a new <code>gestureState</code> object alongside the
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native event object:</p><div class="prism language-javascript">onPanResponderMove<span class="token punctuation">:</span> <span class="token punctuation">(</span>event<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span><span class="token punctuation">}</span></div><p>A native event is a synthetic touch event with the following form:</p><ul><li><code>nativeEvent</code><ul><li><code>changedTouches</code> - Array of all touch events that have changed since the last event</li><li><code>identifier</code> - The ID of the touch</li><li><code>locationX</code> - The X position of the touch, relative to the element</li><li><code>locationY</code> - The Y position of the touch, relative to the element</li><li><code>pageX</code> - The X position of the touch, relative to the root element</li><li><code>pageY</code> - The Y position of the touch, relative to the root element</li><li><code>target</code> - The node id of the element receiving the touch event</li><li><code>timestamp</code> - A time identifier for the touch, useful for velocity calculation</li><li><code>touches</code> - Array of all current touches on the screen</li></ul></li></ul><p>A <code>gestureState</code> object has the following:</p><ul><li><code>stateID</code> - ID of the gestureState- persisted as long as there at least
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one touch on screen</li><li><code>moveX</code> - the latest screen coordinates of the recently-moved touch</li><li><code>moveY</code> - the latest screen coordinates of the recently-moved touch</li><li><code>x0</code> - the screen coordinates of the responder grant</li><li><code>y0</code> - the screen coordinates of the responder grant</li><li><code>dx</code> - accumulated distance of the gesture since the touch started</li><li><code>dy</code> - accumulated distance of the gesture since the touch started</li><li><code>vx</code> - current velocity of the gesture</li><li><code>vy</code> - current velocity of the gesture</li><li><code>numberActiveTouches</code> - Number of touches currently on screen</li></ul><h3><a class="anchor" name="basic-usage"></a>Basic Usage <a class="hash-link" href="#basic-usage">#</a></h3><div class="prism language-javascript"> componentWillMount<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>
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<span class="token keyword">this</span><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>
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<span class="token comment" spellcheck="true"> // Ask to be the responder:
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</span> onStartShouldSetPanResponder<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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onStartShouldSetPanResponderCapture<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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onMoveShouldSetPanResponder<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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onMoveShouldSetPanResponderCapture<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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onPanResponderGrant<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // The guesture has started. Show visual feedback so the user knows
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</span> <span class="token comment" spellcheck="true"> // what is happening!
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</span>
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<span class="token comment" spellcheck="true"> // gestureState.{x,y}0 will be set to zero now
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</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
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onPanResponderMove<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // The most recent move distance is gestureState.move{X,Y}
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</span>
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<span class="token comment" spellcheck="true"> // The accumulated gesture distance since becoming responder is
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</span> <span class="token comment" spellcheck="true"> // gestureState.d{x,y}
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</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
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onPanResponderTerminationRequest<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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onPanResponderRelease<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // The user has released all touches while this view is the
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</span> <span class="token comment" spellcheck="true"> // responder. This typically means a gesture has succeeded
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</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
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onPanResponderTerminate<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // Another component has become the responder, so this gesture
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</span> <span class="token comment" spellcheck="true"> // should be cancelled
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</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
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onShouldBlockNativeResponder<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // Returns whether this component should block native components from becoming the JS
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</span> <span class="token comment" spellcheck="true"> // responder. Returns true by default. Is currently only supported on android.
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</span> <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>
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<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>
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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>
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<span class="token keyword">return</span> <span class="token punctuation">(</span>
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<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>_panResponder<span class="token punctuation">.</span>panHandlers<span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span>
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<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span></div><h3><a class="anchor" name="working-example"></a>Working Example <a class="hash-link" href="#working-example">#</a></h3><p>To see it in action, try the
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<a href="https://github.com/facebook/react-native/blob/master/Examples/UIExplorer/PanResponderExample.js" target="_blank">PanResponder example in UIExplorer</a></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="create"></a><span class="propType">static </span>create<span class="propType">(config: object)</span> <a class="hash-link" href="#create">#</a></h4><div><p>@param {object} config Enhanced versions of all of the responder callbacks
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that provide not only the typical <code>ResponderSyntheticEvent</code>, but also the
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<code>PanResponder</code> gesture state. Simply replace the word <code>Responder</code> with
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<code>PanResponder</code> in each of the typical <code>onResponder*</code> callbacks. For
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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><p><code>onShouldBlockNativeResponder: (e, gestureState) => {...}</code></p><p>In general, for events that have capture equivalents, we update the
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gestureState once in the capture phase and can use it in the bubble phase
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as well.</p><p>Be careful with onStartShould* callbacks. They only reflect updated
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<code>gestureState</code> for start/end events that bubble/capture to the Node.
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Once the node is the responder, you can rely on every start/end event
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being processed by the gesture and <code>gestureState</code> being updated
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accordingly. (numberActiveTouches) may not be totally accurate unless you
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are the responder.</p></li></ul></div></div></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/PanResponderExample.js">Edit on GitHub</a>Examples <a class="hash-link" href="#examples">#</a></h3><div class="prism language-javascript"><span class="token string">'use strict'</span><span class="token punctuation">;</span>
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<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">'react-native'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">var</span> <span class="token punctuation">{</span>
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PanResponder<span class="token punctuation">,</span>
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StyleSheet<span class="token punctuation">,</span>
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View<span class="token punctuation">,</span>
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processColor<span class="token punctuation">,</span>
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<span class="token punctuation">}</span> <span class="token operator">=</span> React<span class="token punctuation">;</span>
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<span class="token keyword">var</span> CIRCLE_SIZE <span class="token operator">=</span> <span class="token number">80</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">var</span> CIRCLE_COLOR <span class="token operator">=</span> <span class="token string">'blue'</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">var</span> CIRCLE_HIGHLIGHT_COLOR <span class="token operator">=</span> <span class="token string">'green'</span><span class="token punctuation">;</span>
|
||
|
||
<span class="token keyword">var</span> PanResponderExample <span class="token operator">=</span> React<span class="token punctuation">.</span><span class="token function">createClass<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
|
||
|
||
statics<span class="token punctuation">:</span> <span class="token punctuation">{</span>
|
||
title<span class="token punctuation">:</span> <span class="token string">'PanResponder Sample'</span><span class="token punctuation">,</span>
|
||
description<span class="token punctuation">:</span> <span class="token string">'Shows the use of PanResponder to provide basic gesture handling.'</span><span class="token punctuation">,</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
|
||
_panResponder<span class="token punctuation">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
_previousLeft<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
|
||
_previousTop<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
|
||
_circleStyles<span class="token punctuation">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
circle<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token keyword">null</span> <span class="token punctuation">:</span> <span class="token operator">?</span><span class="token punctuation">{</span> <span class="token function">setNativeProps<span class="token punctuation">(</span></span>props<span class="token punctuation">:</span> Object<span class="token punctuation">)</span><span class="token punctuation">:</span> void <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
|
||
|
||
componentWillMount<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>_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 keyword">this</span><span class="token punctuation">.</span>_handleStartShouldSetPanResponder<span class="token punctuation">,</span>
|
||
onMoveShouldSetPanResponder<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_handleMoveShouldSetPanResponder<span class="token punctuation">,</span>
|
||
onPanResponderGrant<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_handlePanResponderGrant<span class="token punctuation">,</span>
|
||
onPanResponderMove<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_handlePanResponderMove<span class="token punctuation">,</span>
|
||
onPanResponderRelease<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_handlePanResponderEnd<span class="token punctuation">,</span>
|
||
onPanResponderTerminate<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_handlePanResponderEnd<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>_previousLeft <span class="token operator">=</span> <span class="token number">20</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span>_previousTop <span class="token operator">=</span> <span class="token number">84</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span>_circleStyles <span class="token operator">=</span> <span class="token punctuation">{</span>
|
||
style<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>_previousLeft<span class="token punctuation">,</span>
|
||
top<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_previousTop
|
||
<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>
|
||
|
||
componentDidMount<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><span class="token function">_updatePosition<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>
|
||
|
||
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">return</span> <span class="token punctuation">(</span>
|
||
<View
|
||
style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>container<span class="token punctuation">}</span><span class="token operator">></span>
|
||
<View
|
||
ref<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">(</span>circle<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span>circle <span class="token operator">=</span> circle<span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">}</span>
|
||
style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>circle<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">this</span><span class="token punctuation">.</span>_panResponder<span class="token punctuation">.</span>panHandlers<span class="token punctuation">}</span>
|
||
<span class="token operator">/</span><span class="token operator">></span>
|
||
<<span class="token operator">/</span>View<span class="token operator">></span>
|
||
<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
|
||
_highlight<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>
|
||
const circle <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>circle<span class="token punctuation">;</span>
|
||
circle && circle<span class="token punctuation">.</span><span class="token function">setNativeProps<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
|
||
style<span class="token punctuation">:</span> <span class="token punctuation">{</span>
|
||
backgroundColor<span class="token punctuation">:</span> <span class="token function">processColor<span class="token punctuation">(</span></span>CIRCLE_HIGHLIGHT_COLOR<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>
|
||
|
||
_unHighlight<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>
|
||
const circle <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>circle<span class="token punctuation">;</span>
|
||
circle && circle<span class="token punctuation">.</span><span class="token function">setNativeProps<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
|
||
style<span class="token punctuation">:</span> <span class="token punctuation">{</span>
|
||
backgroundColor<span class="token punctuation">:</span> <span class="token function">processColor<span class="token punctuation">(</span></span>CIRCLE_COLOR<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>
|
||
|
||
_updatePosition<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>circle && <span class="token keyword">this</span><span class="token punctuation">.</span>circle<span class="token punctuation">.</span><span class="token function">setNativeProps<span class="token punctuation">(</span></span><span class="token keyword">this</span><span class="token punctuation">.</span>_circleStyles<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
|
||
_handleStartShouldSetPanResponder<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>e<span class="token punctuation">:</span> Object<span class="token punctuation">,</span> gestureState<span class="token punctuation">:</span> Object<span class="token punctuation">)</span><span class="token punctuation">:</span> boolean <span class="token punctuation">{</span>
|
||
<span class="token comment" spellcheck="true"> // Should we become active when the user presses down on the circle?
|
||
</span> <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
|
||
_handleMoveShouldSetPanResponder<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>e<span class="token punctuation">:</span> Object<span class="token punctuation">,</span> gestureState<span class="token punctuation">:</span> Object<span class="token punctuation">)</span><span class="token punctuation">:</span> boolean <span class="token punctuation">{</span>
|
||
<span class="token comment" spellcheck="true"> // Should we become active when the user moves a touch over the circle?
|
||
</span> <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
|
||
_handlePanResponderGrant<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>e<span class="token punctuation">:</span> Object<span class="token punctuation">,</span> gestureState<span class="token punctuation">:</span> Object<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_highlight<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>
|
||
_handlePanResponderMove<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>e<span class="token punctuation">:</span> Object<span class="token punctuation">,</span> gestureState<span class="token punctuation">:</span> Object<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span>_circleStyles<span class="token punctuation">.</span>style<span class="token punctuation">.</span>left <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_previousLeft <span class="token operator">+</span> gestureState<span class="token punctuation">.</span>dx<span class="token punctuation">;</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span>_circleStyles<span class="token punctuation">.</span>style<span class="token punctuation">.</span>top <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_previousTop <span class="token operator">+</span> gestureState<span class="token punctuation">.</span>dy<span class="token punctuation">;</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_updatePosition<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>
|
||
_handlePanResponderEnd<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>e<span class="token punctuation">:</span> Object<span class="token punctuation">,</span> gestureState<span class="token punctuation">:</span> Object<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_unHighlight<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span>_previousLeft <span class="token operator">+</span><span class="token operator">=</span> gestureState<span class="token punctuation">.</span>dx<span class="token punctuation">;</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span>_previousTop <span class="token operator">+</span><span class="token operator">=</span> gestureState<span class="token punctuation">.</span>dy<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 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>
|
||
circle<span class="token punctuation">:</span> <span class="token punctuation">{</span>
|
||
width<span class="token punctuation">:</span> CIRCLE_SIZE<span class="token punctuation">,</span>
|
||
height<span class="token punctuation">:</span> CIRCLE_SIZE<span class="token punctuation">,</span>
|
||
borderRadius<span class="token punctuation">:</span> CIRCLE_SIZE <span class="token operator">/</span> <span class="token number">2</span><span class="token punctuation">,</span>
|
||
backgroundColor<span class="token punctuation">:</span> CIRCLE_COLOR<span class="token punctuation">,</span>
|
||
position<span class="token punctuation">:</span> <span class="token string">'absolute'</span><span class="token punctuation">,</span>
|
||
left<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
|
||
top<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>
|
||
container<span class="token punctuation">:</span> <span class="token punctuation">{</span>
|
||
flex<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
|
||
paddingTop<span class="token punctuation">:</span> <span class="token number">64</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>
|
||
|
||
module<span class="token punctuation">.</span>exports <span class="token operator">=</span> PanResponderExample<span class="token punctuation">;</span></div></div><div class="docs-prevnext"><a class="docs-next" href="pixelratio.html#content">Next →</a></div></div><noscript></noscript></section><footer class="wrap"><div class="center">© 2015 Facebook Inc.</div></footer></div><div id="fb-root"></div><script>
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