var Component=(()=>{var p=Object.create;var t=Object.defineProperty;var d=Object.getOwnPropertyDescriptor;var h=Object.getOwnPropertyNames;var m=Object.getPrototypeOf,u=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))!u.call(a,e)&&e!=="default"&&t(a,e,{get:()=>s[e],enumerable:!(c=d(s,e))||c.enumerable});return a},y=a=>g(i(t(a!=null?p(m(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 v={};k(v,{default:()=>w,frontmatter:()=>b});var n=y(r()),b={title:"Add to Cart interaction with Reanimated and Gesture Handler",date:"2023-02-08",lastmod:"2023-02-08",tags:["react-native","reanimated","gesture-handler"],draft:!1,layout:"PostLayout",accessCode:"0ef2f1ae56557ba0764cfb67c33f51ef4cedb74e3010be0e5882fe3fcb9d5d80",vimeoId:"793883624"};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",h3:"h3",strong:"strong",pre:"pre",code:"code",h4:"h4",ol:"ol",li:"li"},a.components),{VideoPlayer:l}=e;return l||x("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:`What's up Patreons? How are you doing? You've no idea, how much time I spent on this animation. However the end result is pretty cool and it's definitely worth it.`}),` `,(0,n.jsx)(e.p,{children:"If you have an E-Commerce app or something similar, you can easily reuse the same concept to create a cool interaction."}),` `,(0,n.jsx)(l,{video:a.vimeoId}),` `,(0,n.jsx)(e.p,{children:"Before moving on, keep in mind that this article is definitely easier to understand if you have the code opened in your editor."}),` `,(0,n.jsxs)(e.h3,{id:"dependencies",children:[(0,n.jsx)(e.a,{"aria-hidden":"true",tabIndex:"-1",href:"#dependencies",children:(0,n.jsx)(e.span,{className:"icon icon-link"})}),"Dependencies"]}),` `,(0,n.jsxs)(e.p,{children:["This animation is fully built with ",(0,n.jsx)(e.strong,{children:"React Native Reanimated"})," and ",(0,n.jsx)(e.strong,{children:"React Native Gesture Handler"}),"."]}),` `,(0,n.jsx)(e.pre,{className:"language-bash",children:(0,n.jsx)(e.code,{className:"language-bash code-highlight",children:(0,n.jsxs)(e.span,{className:"code-line",children:["npx expo ",(0,n.jsx)(e.span,{className:"token function",children:"install"}),` react-native-reanimated react-native-gesture-handler `]})})}),` `,(0,n.jsxs)(e.h2,{id:"the-main-idea",children:[(0,n.jsx)(e.a,{"aria-hidden":"true",tabIndex:"-1",href:"#the-main-idea",children:(0,n.jsx)(e.span,{className:"icon icon-link"})}),"The Main Idea"]}),` `,(0,n.jsxs)(e.p,{children:[`This animation is very tricky to implement, but there is a secret. First of all, how to detach a button from a ListItem and make it move freely? `,(0,n.jsx)(e.strong,{children:"The answer is simple: we can't"}),"."]}),` `,(0,n.jsx)(e.p,{children:"The only way I found to achieve this is to create a new button on top of the initial one. This button will be the one that will move freely and the initial button will be hidden."}),` `,(0,n.jsxs)(e.p,{children:["So the problem is fully shifted. ",(0,n.jsx)(e.strong,{children:"Therefore the hardest part is to copy the initial button"}),". Usually that's not a big deal, but in this case, we have to copy the button with a specific size and position in a super smooth way."]}),` `,(0,n.jsxs)(e.p,{children:["The key to achieve this, is to handle all the animation on the UI Thread by using ",(0,n.jsx)(e.strong,{children:"Reanimated"})," and ",(0,n.jsx)(e.strong,{children:"Gesture Handler"}),"."]}),` `,(0,n.jsxs)(e.h2,{id:"the-code",children:[(0,n.jsx)(e.a,{"aria-hidden":"true",tabIndex:"-1",href:"#the-code",children:(0,n.jsx)(e.span,{className:"icon icon-link"})}),"The Code"]}),` `,(0,n.jsx)(e.p,{children:"Before moving on with the code, I want to explain the structure of the project. 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First of all let's check how the ListItem is rendered:"}),` `,(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 spread operator",children:"..."}),` `]}),(0,n.jsx)(e.span,{className:"code-line",children:` `}),(0,n.jsxs)(e.span,{className:"code-line",children:[(0,n.jsx)(e.span,{className:"token keyword",children:"const"})," confirmButtonChildren ",(0,n.jsx)(e.span,{className:"token operator",children:"="})," ",(0,n.jsx)(e.span,{className:"token function",children:"useMemo"}),(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:"{"}),` 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punctuation",children:"{"}),(0,n.jsx)(e.span,{className:"token number",children:"18"}),(0,n.jsx)(e.span,{className:"token punctuation",children:"}"})]})," ",(0,n.jsx)(e.span,{className:"token attr-name",children:"color"}),(0,n.jsxs)(e.span,{className:"token attr-value",children:[(0,n.jsx)(e.span,{className:"token punctuation attr-equals",children:"="}),(0,n.jsx)(e.span,{className:"token punctuation",children:'"'}),"white",(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.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.jsx)(e.span,{className:"token punctuation",children:";"}),` `]}),(0,n.jsx)(e.span,{className:"code-line",children:` `}),(0,n.jsxs)(e.span,{className:"code-line",children:[(0,n.jsx)(e.span,{className:"token spread operator",children:"..."}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[(0,n.jsx)(e.span,{className:"token operator",children:"<"}),(0,n.jsx)(e.span,{className:"token maybe-class-name",children:"FlatList"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" data",(0,n.jsx)(e.span,{className:"token operator",children:"="}),(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),"listItems",(0,n.jsx)(e.span,{className:"token punctuation",children:"}"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" contentContainerStyle",(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 punctuation",children:"{"})," paddingBottom",(0,n.jsx)(e.span,{className:"token operator",children:":"})," ",(0,n.jsx)(e.span,{className:"token number",children:"100"})," ",(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:[" renderItem",(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 punctuation",children:"("}),(0,n.jsx)(e.span,{className:"token punctuation",children:"{"})," item ",(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:[" ",(0,n.jsxs)(e.span,{className:"token tag",children:[(0,n.jsxs)(e.span,{className:"token tag",children:[(0,n.jsx)(e.span,{className:"token punctuation",children:"<"}),(0,n.jsx)(e.span,{className:"token class-name",children:"ListItem"})]}),` `]})]}),(0,n.jsx)(e.span,{className:"code-line",children:(0,n.jsxs)(e.span,{className:"token tag",children:[" ",(0,n.jsx)(e.span,{className:"token attr-name",children:"item"}),(0,n.jsxs)(e.span,{className:"token script language-javascript",children:[(0,n.jsx)(e.span,{className:"token script-punctuation punctuation",children:"="}),(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),"item",(0,n.jsx)(e.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,n.jsx)(e.span,{className:"code-line",children:(0,n.jsxs)(e.span,{className:"token tag",children:[" ",(0,n.jsx)(e.span,{className:"token attr-name",children:"selectedIndex"}),(0,n.jsxs)(e.span,{className:"token script language-javascript",children:[(0,n.jsx)(e.span,{className:"token script-punctuation punctuation",children:"="}),(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),"selectedIndex",(0,n.jsx)(e.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,n.jsx)(e.span,{className:"code-line",children:(0,n.jsxs)(e.span,{className:"token tag",children:[" ",(0,n.jsx)(e.span,{className:"token attr-name",children:"onTap"}),(0,n.jsxs)(e.span,{className:"token script language-javascript",children:[(0,n.jsx)(e.span,{className:"token script-punctuation punctuation",children:"="}),(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),"onTap",(0,n.jsx)(e.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,n.jsx)(e.span,{className:"code-line",children:(0,n.jsxs)(e.span,{className:"token tag",children:[" ",(0,n.jsx)(e.span,{className:"token attr-name",children:"key"}),(0,n.jsxs)(e.span,{className:"token script language-javascript",children:[(0,n.jsx)(e.span,{className:"token script-punctuation punctuation",children:"="}),(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),"item",(0,n.jsx)(e.span,{className:"token punctuation",children:"."}),(0,n.jsx)(e.span,{className:"token property-access",children:"id"}),(0,n.jsx)(e.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,n.jsx)(e.span,{className:"code-line",children:(0,n.jsxs)(e.span,{className:"token tag",children:[" ",(0,n.jsx)(e.span,{className:"token attr-name",children:"index"}),(0,n.jsxs)(e.span,{className:"token script language-javascript",children:[(0,n.jsx)(e.span,{className:"token script-punctuation punctuation",children:"="}),(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),"item",(0,n.jsx)(e.span,{className:"token punctuation",children:"."}),(0,n.jsx)(e.span,{className:"token property-access",children:"id"}),(0,n.jsx)(e.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,n.jsx)(e.span,{className:"code-line",children:(0,n.jsxs)(e.span,{className:"token tag",children:[" ",(0,n.jsx)(e.span,{className:"token attr-name",children:"style"}),(0,n.jsxs)(e.span,{className:"token script language-javascript",children:[(0,n.jsx)(e.span,{className:"token script-punctuation punctuation",children:"="}),(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),"styles",(0,n.jsx)(e.span,{className:"token punctuation",children:"."}),(0,n.jsx)(e.span,{className:"token property-access",children:"listItem"}),(0,n.jsx)(e.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,n.jsx)(e.span,{className:"code-line",children:(0,n.jsxs)(e.span,{className:"token tag",children:[" ",(0,n.jsx)(e.span,{className:"token attr-name",children:"animationProgress"}),(0,n.jsxs)(e.span,{className:"token script language-javascript",children:[(0,n.jsx)(e.span,{className:"token script-punctuation punctuation",children:"="}),(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),"animationProgress",(0,n.jsx)(e.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,n.jsx)(e.span,{className:"code-line",children:(0,n.jsxs)(e.span,{className:"token tag",children:[" ",(0,n.jsx)(e.span,{className:"token attr-name",children:"buttonStyle"}),(0,n.jsxs)(e.span,{className:"token script language-javascript",children:[(0,n.jsx)(e.span,{className:"token script-punctuation 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:"code-line",children:(0,n.jsx)(e.span,{className:"token tag",children:(0,n.jsxs)(e.span,{className:"token script language-javascript",children:[" styles",(0,n.jsx)(e.span,{className:"token punctuation",children:"."}),(0,n.jsx)(e.span,{className:"token property-access",children:"buyButton"}),(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]})})}),(0,n.jsx)(e.span,{className:"code-line",children:(0,n.jsx)(e.span,{className:"token tag",children:(0,n.jsxs)(e.span,{className:"token script language-javascript",children:[" ",(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),` `]})})}),(0,n.jsx)(e.span,{className:"code-line",children:(0,n.jsx)(e.span,{className:"token tag",children:(0,n.jsxs)(e.span,{className:"token script language-javascript",children:[" justifyContent",(0,n.jsx)(e.span,{className:"token operator",children:":"})," ",(0,n.jsx)(e.span,{className:"token string",children:"'center'"}),(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]})})}),(0,n.jsx)(e.span,{className:"code-line",children:(0,n.jsx)(e.span,{className:"token tag",children:(0,n.jsxs)(e.span,{className:"token script language-javascript",children:[" alignItems",(0,n.jsx)(e.span,{className:"token operator",children:":"})," ",(0,n.jsx)(e.span,{className:"token string",children:"'center'"}),(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]})})}),(0,n.jsx)(e.span,{className:"code-line",children:(0,n.jsx)(e.span,{className:"token tag",children:(0,n.jsxs)(e.span,{className:"token script language-javascript",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:"code-line",children:(0,n.jsxs)(e.span,{className:"token tag",children:[(0,n.jsxs)(e.span,{className:"token script language-javascript",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:"code-line",children:(0,n.jsxs)(e.span,{className:"token tag",children:[" ",(0,n.jsx)(e.span,{className:"token attr-name",children:"confirmButtonChildren"}),(0,n.jsxs)(e.span,{className:"token script language-javascript",children:[(0,n.jsx)(e.span,{className:"token script-punctuation punctuation",children:"="}),(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),"confirmButtonChildren",(0,n.jsx)(e.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,n.jsxs)(e.span,{className:"code-line",children:[(0,n.jsxs)(e.span,{className:"token tag",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.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 operator",children:"/"}),(0,n.jsx)(e.span,{className:"token operator",children:">"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[(0,n.jsx)(e.span,{className:"token spread operator",children:"..."}),` `]}),(0,n.jsx)(e.span,{className:"code-line",children:` `}),(0,n.jsxs)(e.span,{className:"code-line",children:[(0,n.jsx)(e.span,{className:"token keyword",children:"const"})," styles ",(0,n.jsx)(e.span,{className:"token operator",children:"="})," ",(0,n.jsx)(e.span,{className:"token maybe-class-name",children:"StyleSheet"}),(0,n.jsx)(e.span,{className:"token punctuation",children:"."}),(0,n.jsx)(e.span,{className:"token method function property-access",children:"create"}),(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 spread operator",children:"..."}),(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" buyButton",(0,n.jsx)(e.span,{className:"token operator",children:":"})," ",(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" height",(0,n.jsx)(e.span,{className:"token operator",children:":"})," ",(0,n.jsx)(e.span,{className:"token number",children:"40"}),(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" width",(0,n.jsx)(e.span,{className:"token operator",children:":"})," ",(0,n.jsx)(e.span,{className:"token number",children:"40"}),(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" borderRadius",(0,n.jsx)(e.span,{className:"token operator",children:":"})," ",(0,n.jsx)(e.span,{className:"token number",children:"10"}),(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" backgroundColor",(0,n.jsx)(e.span,{className:"token operator",children:":"})," ",(0,n.jsx)(e.span,{className:"token string",children:"'#000'"}),(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 spread operator",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.jsxs)(e.p,{children:["In the code above, you can see that the ",(0,n.jsx)(e.strong,{children:"ListItem"})," component is rendered inside a ",(0,n.jsx)(e.strong,{children:"FlatList"}),". The ",(0,n.jsx)(e.strong,{children:"FlatList"})," is used in order to display a list of items."]}),` `,(0,n.jsxs)(e.p,{children:[`As you can see I've tried to extract the "`,(0,n.jsx)(e.strong,{children:"buttonStyle"}),'" and the "',(0,n.jsx)(e.strong,{children:"confirmButtonChildren"}),'" props from the ',(0,n.jsx)(e.strong,{children:"ListItem"}),' component. This is made in order to simplify the "copy" operation of the button contained inside the ListItem.']}),` `,(0,n.jsxs)(e.p,{children:["The ",(0,n.jsx)(e.strong,{children:"confirmButtonChildren"})," prop is used to render the content of the button. In this case, I've used the ",(0,n.jsx)(e.strong,{children:"Feather"})," icon library in order to render the shopping cart icon (you can use whatever you want)."]}),` `,(0,n.jsxs)(e.h4,{id:"compute-the-layout-of-the-listitem",children:[(0,n.jsx)(e.a,{"aria-hidden":"true",tabIndex:"-1",href:"#compute-the-layout-of-the-listitem",children:(0,n.jsx)(e.span,{className:"icon icon-link"})}),"Compute the layout of the ListItem"]}),` `,(0,n.jsxs)(e.p,{children:["The first thing we need to do is to compute the layout of the ListItem. In order to do that, we need to use the ",(0,n.jsx)(e.strong,{children:"useAnimatedRef"})," hook and the ",(0,n.jsx)(e.strong,{children:"measure"})," function."]}),` `,(0,n.jsxs)(e.p,{children:["The ",(0,n.jsx)(e.strong,{children:"measure"})," function will return the layout of the view that we pass as a parameter. In this case, we pass the ",(0,n.jsx)(e.strong,{children:"viewRef"}),`. Notice that the measure function is a `,(0,n.jsx)(e.strong,{children:"worklet"}),". This means that it must be called inside a ",(0,n.jsx)(e.strong,{children:"worklet"}),". In this case, we call it inside the ",(0,n.jsx)(e.strong,{children:"onPress"})," callback which is executed inside the ",(0,n.jsx)(e.strong,{children:"PressableScale"})," component."]}),` `,(0,n.jsxs)(e.p,{children:["That's why previously I've underlined the importance of the ",(0,n.jsx)(e.strong,{children:"onPress"})," callback to be a ",(0,n.jsx)(e.strong,{children:"worklet"})," into the ",(0,n.jsx)(e.strong,{children:"PressableScale"})," component."]}),` `,(0,n.jsx)("div",{className:"remark-code-title",children:"src/components/list-item/index.tsx"}),` `,(0,n.jsx)(e.pre,{className:"language-tsx",children:(0,n.jsxs)(e.code,{className:"language-tsx code-highlight",children:[(0,n.jsx)(e.span,{className:"code-line",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:"ListItem"})," ",(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 punctuation",children:"{"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" index",(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" item",(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" onTap",(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" buttonStyle",(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" selectedIndex",(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" confirmButtonChildren",(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" animationProgress",(0,n.jsx)(e.span,{className:"token punctuation",children:","}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" style",(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 operator",children:":"})," ",(0,n.jsx)(e.span,{className:"token maybe-class-name",children:"ListItemProps"}),(0,n.jsx)(e.span,{className:"token operator",children:"<"}),(0,n.jsx)(e.span,{className:"token constant",children:"T"}),(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 arrow operator",children:"=>"})," ",(0,n.jsx)(e.span,{className:"token punctuation",children:"{"}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[" 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The interesting part is that the values are resetted only when the animation is completed, since we want to restore everything as it was before the animation.`]}),` `,(0,n.jsx)("div",{className:"remark-code-title",children:"src/index.tsx"}),` `,(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 spread operator",children:"..."}),` `]}),(0,n.jsxs)(e.span,{className:"code-line",children:[(0,n.jsx)(e.span,{className:"token keyword",children:"const"})," onDismiss ",(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 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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.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:"["}),"animationProgress",(0,n.jsx)(e.span,{className:"token punctuation",children:","})," layoutData",(0,n.jsx)(e.span,{className:"token punctuation",children:","})," selectedIndex",(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.span,{className:"code-line",children:[(0,n.jsx)(e.span,{className:"token spread operator",children:"..."}),` `]})]})}),` `,(0,n.jsx)(e.p,{children:"And that's it!"}),` `,(0,n.jsxs)(e.h2,{id:"conclusion",children:[(0,n.jsx)(e.a,{"aria-hidden":"true",tabIndex:"-1",href:"#conclusion",children:(0,n.jsx)(e.span,{className:"icon icon-link"})}),"Conclusion"]}),` `,(0,n.jsxs)(e.p,{children:["I think that this animation isn't that complex, but it requires a lot of work to be done. That's because there are a lot of things to take care of, like the ",(0,n.jsx)(e.strong,{children:"onPress"})," callback, the ",(0,n.jsx)(e.strong,{children:"layout"})," of the component, the ",(0,n.jsx)(e.strong,{children:"animationProgress"})," and the ",(0,n.jsx)(e.strong,{children:"selectedIndex"}),". I hope that this article will help you to understand how to implement this kind of animation."]}),` `,(0,n.jsx)(e.p,{children:"My suggestion is to try yourself to implement this animation, starting from scratch. It's definitely a good exercise to improve your skills and to discover new things."}),` `,(0,n.jsx)(e.p,{children:"Thank you very much for your time and your support. I'm really grateful for that."})]})}}var w=f;function x(a,s){throw new Error("Expected "+(s?"component":"object")+" `"+a+"` to be defined: you likely forgot to import, pass, or provide it.")}return v;})(); ;return Component;