var Component=(()=>{var p=Object.create;var t=Object.defineProperty;var d=Object.getOwnPropertyDescriptor;var h=Object.getOwnPropertyNames;var u=Object.getPrototypeOf,m=Object.prototype.hasOwnProperty;var i=a=>t(a,"__esModule",{value:!0});var N=(a,s)=>()=>(s||a((s={exports:{}}).exports,s),s.exports),k=(a,s)=>{i(a);for(var c in s)t(a,c,{get:s[c],enumerable:!0})},g=(a,s,c)=>{if(s&&typeof s=="object"||typeof s=="function")for(let e of h(s))!m.call(a,e)&&e!=="default"&&t(a,e,{get:()=>s[e],enumerable:!(c=d(s,e))||c.enumerable});return a},w=a=>g(i(t(a!=null?p(u(a)):{},"default",a&&a.__esModule&&"default"in a?{get:()=>a.default,enumerable:!0}:{value:a,enumerable:!0})),a);var r=N((T,o)=>{o.exports=_jsx_runtime});var x={};k(x,{default:()=>v,frontmatter:()=>y});var n=w(r()),y={title:"React Native Swipe Cards Animation",date:"2022-12-10",lastmod:"2022-12-10",tags:["react-native","react","reanimated","react-native-gesture-handler","react-native-skia"],draft:!1,layout:"PostLayout",accessCode:"20e2eddb472dfa36f7d2e3b6841da2984e2a934eac78a1f698ab832e78759aa3",vimeoId:"780818528"};function f(a={}){let{wrapper:s}=a.components||{};return s?(0,n.jsx)(s,Object.assign({},a,{children:(0,n.jsx)(c,{})})):c();function c(){let e=Object.assign({h2:"h2",a:"a",span:"span",p:"p",ul:"ul",li:"li",pre:"pre",code:"code",em:"em",strong:"strong",h3:"h3",h4:"h4"},a.components),{VideoPlayer:l}=e;return l||b("VideoPlayer",!0),(0,n.jsxs)(n.Fragment,{children:[(0,n.jsxs)(e.h2,{id:"introduction",children:[(0,n.jsx)(e.a,{"aria-hidden":"true",tabIndex:"-1",href:"#introduction",children:(0,n.jsx)(e.span,{className:"icon icon-link"})}),"Introduction"]}),` `,(0,n.jsx)(e.p,{children:"In this article we will explore in detail the implementation of a swipe cards animation using React Native Reanimated and React Native Gesture Handler. We will also explore how to use the Reanimated API to create a custom hook that will allow us to create a swipe animation."}),` `,(0,n.jsx)(e.p,{children:"The implementation consists in three different components:"}),` `,(0,n.jsxs)(e.ul,{children:[` `,(0,n.jsx)(e.li,{children:"SwipeableCard: it's the main component of the animation. It will be responsible for rendering the card and the animation;"}),` `,(0,n.jsx)(e.li,{children:"ScaleButton: it's a button that can be scaled when the user presses it;"}),` `,(0,n.jsx)(e.li,{children:"PieChart: it's a simple pie chart that can be animated."}),` `]}),` `,(0,n.jsx)(e.p,{children:"I heavily recommend to read this article with the code open in your editor. It will be easier to understand the implementation."}),` `,(0,n.jsx)(l,{video:a.vimeoId}),` `,(0,n.jsxs)(e.h2,{id:"swipeablecard",children:[(0,n.jsx)(e.a,{"aria-hidden":"true",tabIndex:"-1",href:"#swipeablecard",children:(0,n.jsx)(e.span,{className:"icon icon-link"})}),"SwipeableCard"]}),` `,(0,n.jsx)(e.p,{children:`Each SwipeableCard has the responsibility to render a card and to animate it. The animation is triggered when the user swipes the card. In order to achieve this, we will use the GestureDetector component from React Native Gesture Handler (and we'll handle just the Pan gesture). This component will allow us to detect the user's gestures and to trigger the animation.`}),` `,(0,n.jsx)(e.p,{children:"Therefore, the component will be composed by the following elements:"}),` `,(0,n.jsxs)(e.ul,{children:[` `,(0,n.jsx)(e.li,{children:"GestureDetector: it will detect the user's gestures and will trigger the animation;"}),` `,(0,n.jsx)(e.li,{children:"Animated.View: it will be used to animate the card;"}),` `,(0,n.jsx)(e.li,{children:"Card: it will be the component that will render the card."}),` `]}),` `,(0,n.jsx)(e.p,{children:"The animation is composed by two parts: the first one is the translation of the card and the second one is the rotation of the card."}),` `,(0,n.jsx)(e.pre,{className:"language-tsx",children:(0,n.jsxs)(e.code,{className:"language-tsx code-highlight",children:[(0,n.jsxs)(e.span,{className:"code-line",children:[(0,n.jsx)(e.span,{className:"token keyword",children:"const"})," gesture ",(0,n.jsx)(e.span,{className:"token operator",children:"="})," 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",(0,n.jsx)(e.span,{className:"token function",children:"withSpring"}),(0,n.jsx)(e.span,{className:"token punctuation",children:"("}),(0,n.jsx)(e.span,{className:"token number",children:"0"}),(0,n.jsx)(e.span,{className:"token punctuation",children:")"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" ",(0,n.jsx)(e.span,{className:"token punctuation",children:"}"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" ",(0,n.jsx)(e.span,{className:"token punctuation",children:"}"}),(0,n.jsx)(e.span,{className:"token punctuation",children:")"}),` `]})]})}),` `,(0,n.jsx)(e.p,{children:"By checking the code above, you can see two unusual SharedValue:"}),` `,(0,n.jsxs)(e.ul,{children:[` `,(0,n.jsx)(e.li,{children:"currentActiveIndex: it's used to keep track of the current active index;"}),` `,(0,n.jsx)(e.li,{children:"nextActiveIndex: it's used to keep track of the next active index."}),` `]}),` `,(0,n.jsx)(e.p,{children:"You can see that we're blocking the onUpdate 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This is necessary because we want to trigger the animation only for the card that is currently active."}),` `,(0,n.jsxs)(e.p,{children:["The reason why we need to keep track of the ",(0,n.jsx)(e.em,{children:"nextActiveIndex"}),` is because we want to understand if the user is swiping the card. In fact if `,(0,n.jsx)(e.code,{children:"nextActiveIndex"})," is equal to ",(0,n.jsx)(e.code,{children:"activeIndex + 1"}),`, it means that the user is swiping the card. Otherwise, it means that the user is not swiping the card. In order to understand if the user is swiping the card to the left or to the right, we need to analyze also the translationX value and check if it's positive or negative. If it's positive, the user is swiping the card to the right, otherwise, the user is swiping the card to the left.`]}),` `,(0,n.jsxs)(e.p,{children:[(0,n.jsx)(e.strong,{children:"But what about the rotation of the card? 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`]}),(0,n.jsxs)(e.span,{className:"code-line",children:[(0,n.jsx)(e.span,{className:"token punctuation",children:"}"}),(0,n.jsx)(e.span,{className:"token punctuation",children:","})," ",(0,n.jsx)(e.span,{className:"token punctuation",children:"["}),(0,n.jsx)(e.span,{className:"token punctuation",children:"]"}),(0,n.jsx)(e.span,{className:"token punctuation",children:")"}),` `]})]})}),` `,(0,n.jsxs)(e.p,{children:["Both methods are very easy to understand. They just trigger the spring animation till the ",(0,n.jsx)(e.strong,{children:"maxCardTranslation"})," and update the activeIndex."]}),` `,(0,n.jsxs)(e.h3,{id:"how-to-control-the-swipeablecard-without-gestures",children:[(0,n.jsx)(e.a,{"aria-hidden":"true",tabIndex:"-1",href:"#how-to-control-the-swipeablecard-without-gestures",children:(0,n.jsx)(e.span,{className:"icon icon-link"})}),"How to control the SwipeableCard without gestures"]}),` `,(0,n.jsxs)(e.p,{children:["That's probably the most interesting part of the tutorial. The point is that we want to be able to control the SwipeableCard without gestures. In fact, we want to be able to swipe the card programmatically. The key to implementation such behavior is to rely on the ",(0,n.jsx)(e.strong,{children:"useImperativeHandle"})," hook from React."]}),` `,(0,n.jsx)(e.pre,{className:"language-tsx",children:(0,n.jsxs)(e.code,{className:"language-tsx code-highlight",children:[(0,n.jsxs)(e.span,{className:"code-line",children:[(0,n.jsx)(e.span,{className:"token function",children:"useImperativeHandle"}),(0,n.jsx)(e.span,{className:"token punctuation",children:"("}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" ref",(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" ",(0,n.jsx)(e.span,{className:"token punctuation",children:"("}),(0,n.jsx)(e.span,{className:"token punctuation",children:")"})," ",(0,n.jsx)(e.span,{className:"token arrow operator",children:"=>"})," ",(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" ",(0,n.jsx)(e.span,{className:"token keyword",children:"return"})," ",(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" swipeLeft",(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" swipeRight",(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" reset",(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" ",(0,n.jsx)(e.span,{className:"token punctuation",children:"}"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" ",(0,n.jsx)(e.span,{className:"token punctuation",children:"}"}),(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" ",(0,n.jsx)(e.span,{className:"token punctuation",children:"["}),"swipeLeft",(0,n.jsx)(e.span,{className:"token punctuation",children:","})," swipeRight",(0,n.jsx)(e.span,{className:"token punctuation",children:","})," reset",(0,n.jsx)(e.span,{className:"token punctuation",children:"]"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[(0,n.jsx)(e.span,{className:"token punctuation",children:")"}),` `]})]})}),` `,(0,n.jsx)(e.p,{children:"As you can see there's another method that we need to expose programmatically and that's the reset method. This method just cancels the animation and resets the translateX and translateY values with a springAnimation."}),` `,(0,n.jsx)(e.pre,{className:"language-tsx",children:(0,n.jsxs)(e.code,{className:"language-tsx code-highlight",children:[(0,n.jsxs)(e.span,{className:"code-line",children:[(0,n.jsx)(e.span,{className:"token keyword",children:"const"})," reset ",(0,n.jsx)(e.span,{className:"token operator",children:"="})," ",(0,n.jsx)(e.span,{className:"token function",children:"useCallback"}),(0,n.jsx)(e.span,{className:"token punctuation",children:"("}),(0,n.jsx)(e.span,{className:"token punctuation",children:"("}),(0,n.jsx)(e.span,{className:"token punctuation",children:")"})," ",(0,n.jsx)(e.span,{className:"token arrow operator",children:"=>"})," ",(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" ",(0,n.jsx)(e.span,{className:"token keyword",children:"if"})," ",(0,n.jsx)(e.span,{className:"token punctuation",children:"("}),"translateX",(0,n.jsx)(e.span,{className:"token punctuation",children:"."}),(0,n.jsx)(e.span,{className:"token property-access",children:"value"})," ",(0,n.jsx)(e.span,{className:"token operator",children:"!=="})," ",(0,n.jsx)(e.span,{className:"token number",children:"0"}),(0,n.jsx)(e.span,{className:"token punctuation",children:")"})," ",(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" ",(0,n.jsx)(e.span,{className:"token function",children:"cancelAnimation"}),(0,n.jsx)(e.span,{className:"token punctuation",children:"("}),"translateX",(0,n.jsx)(e.span,{className:"token punctuation",children:")"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" translateX",(0,n.jsx)(e.span,{className:"token punctuation",children:"."}),(0,n.jsx)(e.span,{className:"token property-access",children:"value"})," ",(0,n.jsx)(e.span,{className:"token operator",children:"="})," ",(0,n.jsx)(e.span,{className:"token function",children:"withSpring"}),(0,n.jsx)(e.span,{className:"token punctuation",children:"("}),(0,n.jsx)(e.span,{className:"token number",children:"0"}),(0,n.jsx)(e.span,{className:"token punctuation",children:")"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" ",(0,n.jsx)(e.span,{className:"token punctuation",children:"}"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" ",(0,n.jsx)(e.span,{className:"token keyword",children:"if"})," ",(0,n.jsx)(e.span,{className:"token punctuation",children:"("}),"translateX",(0,n.jsx)(e.span,{className:"token punctuation",children:"."}),(0,n.jsx)(e.span,{className:"token property-access",children:"value"})," ",(0,n.jsx)(e.span,{className:"token operator",children:"!=="})," ",(0,n.jsx)(e.span,{className:"token number",children:"0"}),(0,n.jsx)(e.span,{className:"token punctuation",children:")"})," ",(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" ",(0,n.jsx)(e.span,{className:"token function",children:"cancelAnimation"}),(0,n.jsx)(e.span,{className:"token punctuation",children:"("}),"translateY",(0,n.jsx)(e.span,{className:"token punctuation",children:")"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" translateY",(0,n.jsx)(e.span,{className:"token punctuation",children:"."}),(0,n.jsx)(e.span,{className:"token property-access",children:"value"})," ",(0,n.jsx)(e.span,{className:"token operator",children:"="})," ",(0,n.jsx)(e.span,{className:"token function",children:"withSpring"}),(0,n.jsx)(e.span,{className:"token punctuation",children:"("}),(0,n.jsx)(e.span,{className:"token number",children:"0"}),(0,n.jsx)(e.span,{className:"token punctuation",children:")"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" ",(0,n.jsx)(e.span,{className:"token punctuation",children:"}"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[(0,n.jsx)(e.span,{className:"token punctuation",children:"}"}),(0,n.jsx)(e.span,{className:"token punctuation",children:","})," ",(0,n.jsx)(e.span,{className:"token punctuation",children:"["}),(0,n.jsx)(e.span,{className:"token punctuation",children:"]"}),(0,n.jsx)(e.span,{className:"token punctuation",children:")"}),` `]})]})}),` `,(0,n.jsxs)(e.p,{children:["By using the ",(0,n.jsx)(e.strong,{children:"useImperativeHandle"})," hook, we're able to expose the methods that we want to expose programmatically. In this case we can access the swipeLeft, swipeRight and reset methods from the parent component, by simply passing the ref."]}),` `,(0,n.jsx)(e.p,{children:"Therefore, we need to create an array of refs from the parent component, and then we need to access the methods of each SwipeableCard by using the ref that is currently active."}),` `,(0,n.jsxs)(e.p,{children:["All this logic has simply been wrapped inside a custom hook called ",(0,n.jsx)(e.strong,{children:"useSwipeControls"}),"."]}),` `,(0,n.jsx)(e.pre,{className:"language-tsx",children:(0,n.jsxs)(e.code,{className:"language-tsx code-highlight",children:[(0,n.jsxs)(e.span,{className:"code-line",children:[(0,n.jsx)(e.span,{className:"token keyword",children:"const"})," ",(0,n.jsx)(e.span,{className:"token function-variable function",children:"useSwipeControls"})," ",(0,n.jsx)(e.span,{className:"token operator",children:"="})," ",(0,n.jsx)(e.span,{className:"token punctuation",children:"("}),(0,n.jsx)(e.span,{className:"token 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