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 l=a=>t(a,"__esModule",{value:!0});var N=(a,n)=>()=>(n||a((n={exports:{}}).exports,n),n.exports),k=(a,n)=>{l(a);for(var s in n)t(a,s,{get:n[s],enumerable:!0})},g=(a,n,s)=>{if(n&&typeof n=="object"||typeof n=="function")for(let c of h(n))!u.call(a,c)&&c!=="default"&&t(a,c,{get:()=>n[c],enumerable:!(s=d(n,c))||s.enumerable});return a},y=a=>g(l(t(a!=null?p(m(a)):{},"default",a&&a.__esModule&&"default"in a?{get:()=>a.default,enumerable:!0}:{value:a,enumerable:!0})),a);var o=N((S,i)=>{i.exports=_jsx_runtime});var x={};k(x,{default:()=>v,frontmatter:()=>w});var e=y(o()),w={title:"React Native Animated Scroll Progress Bar",date:"2022-12-27",lastmod:"2022-12-27",tags:["react-native","react","react-native-reanimated"],draft:!1,layout:"PostLayout",accessCode:"d12766133023a13eb24fbfa1fba9bba216c210eb472014ba087909c1e91bfe70",vimeoId:"784528828"};function r(a){let n=Object.assign({h2:"h2",a:"a",span:"span",p:"p",code:"code",h3:"h3",ul:"ul",li:"li",strong:"strong",pre:"pre",div:"div",ol:"ol"},a.components),{VideoPlayer:s}=n;return s||f("VideoPlayer",!0),(0,e.jsxs)(e.Fragment,{children:[(0,e.jsxs)(n.h2,{id:"introduction",children:[(0,e.jsx)(n.a,{"aria-hidden":"true",tabIndex:"-1",href:"#introduction",children:(0,e.jsx)(n.span,{className:"icon icon-link"})}),"Introduction"]}),` `,(0,e.jsx)(n.p,{children:"What's up Patreons? In this post, we'll be building a scroll progress bar component for React Native. We'll be using just the Reanimated API."}),` `,(0,e.jsx)(s,{video:a.vimeoId}),` `,(0,e.jsxs)(n.p,{children:["The animation is quite simple, but it's a great example of how to use the new Reanimated API. We'll be using the ",(0,e.jsx)(n.code,{children:"useAnimatedScrollHandler"})," hook to create a scroll handler that will update the progress bar as we scroll through a list of items."]}),` `,(0,e.jsx)(n.p,{children:"As usual, I highly recommend to read this post with the source code open in your editor."}),` `,(0,e.jsxs)(n.h3,{id:"resources",children:[(0,e.jsx)(n.a,{"aria-hidden":"true",tabIndex:"-1",href:"#resources",children:(0,e.jsx)(n.span,{className:"icon icon-link"})}),"Resources"]}),` `,(0,e.jsxs)(n.p,{children:["The key to understand the animation is to understand the ",(0,e.jsx)(n.code,{children:"useAnimatedScrollHandler"})," hook. I've already used this hook in some of my previous tutorials, so if you're interested check out them on YouTube:"]}),` `,(0,e.jsxs)(n.ul,{children:[` `,(0,e.jsx)(n.li,{children:(0,e.jsx)(n.a,{href:"https://youtu.be/SqwpRr7kbnQ",children:"Interpolate with ScrollView like a pro (React Native Reanimated)"})}),` `,(0,e.jsx)(n.li,{children:(0,e.jsx)(n.a,{href:"https://youtu.be/OT-73hpwxXQ",children:"React Native Advanced Onboarding (Reanimated)"})}),` `]}),` `,(0,e.jsxs)(n.h2,{id:"component-structure",children:[(0,e.jsx)(n.a,{"aria-hidden":"true",tabIndex:"-1",href:"#component-structure",children:(0,e.jsx)(n.span,{className:"icon icon-link"})}),"Component Structure"]}),` `,(0,e.jsxs)(n.p,{children:["The component that I've built is called ",(0,e.jsx)(n.strong,{children:"SectionContentList"}),". The idea is that I'm trying to extract the logic of this animation in a separate and reusable component."]}),` `,(0,e.jsx)(n.p,{children:"Here's the structure of the component:"}),` `,(0,e.jsx)(n.pre,{className:"language-tsx",children:(0,e.jsxs)(n.code,{className:"language-tsx code-highlight",children:[(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsxs)(n.span,{className:"token tag",children:[(0,e.jsxs)(n.span,{className:"token tag",children:[(0,e.jsx)(n.span,{className:"token punctuation",children:"<"}),(0,e.jsx)(n.span,{className:"token class-name",children:"SectionContentList"})]}),` `]})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsxs)(n.span,{className:"token tag",children:[" ",(0,e.jsx)(n.span,{className:"token attr-name",children:"sections"}),(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[(0,e.jsx)(n.span,{className:"token script-punctuation punctuation",children:"="}),(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),"sections",(0,e.jsx)(n.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsxs)(n.span,{className:"token tag",children:[" ",(0,e.jsx)(n.span,{className:"token attr-name",children:"renderSection"}),(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[(0,e.jsx)(n.span,{className:"token script-punctuation punctuation",children:"="}),(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),"renderSection",(0,e.jsx)(n.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsxs)(n.span,{className:"token tag",children:[" ",(0,e.jsx)(n.span,{className:"token attr-name",children:"contentContainerStyle"}),(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[(0,e.jsx)(n.span,{className:"token script-punctuation punctuation",children:"="}),(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),` `]})]})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsx)(n.span,{className:"token tag",children:(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[" paddingHorizontal",(0,e.jsx)(n.span,{className:"token operator",children:":"})," ",(0,e.jsx)(n.span,{className:"token number",children:"20"}),(0,e.jsx)(n.span,{className:"token punctuation",children:","}),` `]})})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsx)(n.span,{className:"token tag",children:(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[" paddingTop",(0,e.jsx)(n.span,{className:"token operator",children:":"})," ",(0,e.jsx)(n.span,{className:"token number",children:"20"}),(0,e.jsx)(n.span,{className:"token punctuation",children:","}),` `]})})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsx)(n.span,{className:"token tag",children:(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[" paddingBottom",(0,e.jsx)(n.span,{className:"token operator",children:":"})," ",(0,e.jsx)(n.span,{className:"token number",children:"100"}),(0,e.jsx)(n.span,{className:"token punctuation",children:","}),` `]})})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsxs)(n.span,{className:"token tag",children:[(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[" ",(0,e.jsx)(n.span,{className:"token punctuation",children:"}"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token tag",children:(0,e.jsx)(n.span,{className:"token punctuation",children:"/>"})}),` `]})]})}),` `,(0,e.jsx)(n.p,{children:"The component accepts a list of sections, a render function for each section, and a style for the content container. The component will also render a progress bar at the bottom of the screen. The progress bar will update as we scroll through the list of sections."}),` `,(0,e.jsx)(n.p,{children:"Long story short, you can easily reuse this component across your projects."}),` `,(0,e.jsxs)(n.h2,{id:"the-approach",children:[(0,e.jsx)(n.a,{"aria-hidden":"true",tabIndex:"-1",href:"#the-approach",children:(0,e.jsx)(n.span,{className:"icon icon-link"})}),"The approach"]}),` `,(0,e.jsx)(n.p,{children:"By checking the source code, it's easy to get scared by the amount of code. However, the idea is quite simple. The main point is that we want to evaluate the progress bar percentage, by taking the amount of pixels that we've scrolled and dividing it by the total amount of pixels that we can scroll."}),` `,(0,e.jsx)(n.p,{children:"The total amont that we can scroll is given by the height of the scrollView (so of all the sections) minus the height of the screen."}),` `,(0,e.jsx)(n.div,{className:"remark-code-title",children:"src/section-content-list"}),` `,(0,e.jsx)(n.pre,{className:"language-tsx",children:(0,e.jsxs)(n.code,{className:"language-tsx code-highlight",children:[(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token keyword",children:"const"})," scrollableHeight ",(0,e.jsx)(n.span,{className:"token operator",children:"="})," ",(0,e.jsx)(n.span,{className:"token function",children:"useDerivedValue"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"("}),(0,e.jsx)(n.span,{className:"token punctuation",children:"("}),(0,e.jsx)(n.span,{className:"token punctuation",children:")"})," ",(0,e.jsx)(n.span,{className:"token arrow operator",children:"=>"})," ",(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[" ",(0,e.jsx)(n.span,{className:"token keyword",children:"return"})," scrollHeight",(0,e.jsx)(n.span,{className:"token punctuation",children:"."}),(0,e.jsx)(n.span,{className:"token property-access",children:"value"})," ",(0,e.jsx)(n.span,{className:"token operator",children:"-"})," viewHeight",(0,e.jsx)(n.span,{className:"token punctuation",children:"."}),(0,e.jsx)(n.span,{className:"token property-access",children:"value"})," ",(0,e.jsx)(n.span,{className:"token operator",children:"+"}),` paddingBottom `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token punctuation",children:"}"}),(0,e.jsx)(n.span,{className:"token punctuation",children:","})," ",(0,e.jsx)(n.span,{className:"token punctuation",children:"["}),"paddingBottom",(0,e.jsx)(n.span,{className:"token punctuation",children:"]"}),(0,e.jsx)(n.span,{className:"token punctuation",children:")"}),` `]})]})}),` `,(0,e.jsx)(n.p,{children:"As you can see I've also considered the paddingBottom value. This is because I want to make sure that the progress bar is always visible at the bottom of the screen."}),` `,(0,e.jsxs)(n.p,{children:["The paddingBottom value is given by the contentContainerStyle of the ScrollView. In order to evaluate the paddingBottom value, I've used the ",(0,e.jsx)(n.code,{children:"useMemo"}),` hook to evaluate the paddingBottom value only when the contentContainerStyle changes. Of course we can pass directly the paddingBottom as a prop to the SectionContentList, but I think that this approach is definitely more flexible.`]}),` `,(0,e.jsx)(n.div,{className:"remark-code-title",children:"src/section-content-list"}),` `,(0,e.jsx)(n.pre,{className:"language-tsx",children:(0,e.jsxs)(n.code,{className:"language-tsx code-highlight",children:[(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token keyword",children:"const"})," paddingBottom ",(0,e.jsx)(n.span,{className:"token operator",children:"="})," ",(0,e.jsx)(n.span,{className:"token function",children:"useMemo"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"("}),(0,e.jsx)(n.span,{className:"token punctuation",children:"("}),(0,e.jsx)(n.span,{className:"token punctuation",children:")"})," ",(0,e.jsx)(n.span,{className:"token arrow operator",children:"=>"})," ",(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[" ",(0,e.jsx)(n.span,{className:"token keyword",children:"return"})," ",(0,e.jsx)(n.span,{className:"token operator",children:"+"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"("}),(0,e.jsx)(n.span,{className:"token maybe-class-name",children:"StyleSheet"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"."}),(0,e.jsx)(n.span,{className:"token method function property-access",children:"flatten"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"("}),"scrollViewProps",(0,e.jsx)(n.span,{className:"token punctuation",children:"."}),(0,e.jsx)(n.span,{className:"token property-access",children:"contentContainerStyle"})," ",(0,e.jsx)(n.span,{className:"token operator",children:"??"})," ",(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"}"}),(0,e.jsx)(n.span,{className:"token punctuation",children:")"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"."}),(0,e.jsx)(n.span,{className:"token property-access",children:"paddingBottom"})," ",(0,e.jsx)(n.span,{className:"token operator",children:"??"})," ",(0,e.jsx)(n.span,{className:"token number",children:"0"}),(0,e.jsx)(n.span,{className:"token punctuation",children:")"}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token punctuation",children:"}"}),(0,e.jsx)(n.span,{className:"token punctuation",children:","})," ",(0,e.jsx)(n.span,{className:"token punctuation",children:"["}),"scrollViewProps",(0,e.jsx)(n.span,{className:"token punctuation",children:"."}),(0,e.jsx)(n.span,{className:"token property-access",children:"contentContainerStyle"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"]"}),(0,e.jsx)(n.span,{className:"token punctuation",children:")"}),` `]})]})}),` `,(0,e.jsxs)(n.h3,{id:"how-do-we-find-the-viewheight-and-scrollableheight",children:[(0,e.jsx)(n.a,{"aria-hidden":"true",tabIndex:"-1",href:"#how-do-we-find-the-viewheight-and-scrollableheight",children:(0,e.jsx)(n.span,{className:"icon icon-link"})}),"How do we find the ViewHeight and ScrollableHeight?"]}),` `,(0,e.jsx)(n.p,{children:"That's the tricky part. We need to find the height of the ScrollView and the height of the View. The height of the ScrollView is given by the sum of the height of all the sections. The height of the View is given by the height of the screen."}),` `,(0,e.jsxs)(n.p,{children:["In order to get both heights we need to use the ",(0,e.jsx)(n.code,{children:"onLayout"})," event. The ",(0,e.jsx)(n.code,{children:"onLayout"})," event is fired when the layout of the view changes."]}),` `,(0,e.jsx)(n.p,{children:"So I've retrieved the:"}),` `,(0,e.jsxs)(n.ul,{children:[` `,(0,e.jsxs)(n.li,{children:[(0,e.jsx)(n.strong,{children:"viewHeight"})," by wrapping the ScrollView with a View and using the ",(0,e.jsx)(n.code,{children:"onLayout"})," event of the View."]}),` `,(0,e.jsxs)(n.li,{children:[(0,e.jsx)(n.strong,{children:"scrollHeight"})," by wrapping the mapped sections with a View and using again the ",(0,e.jsx)(n.code,{children:"onLayout"}),"event of the View."]}),` `]}),` `,(0,e.jsxs)(n.p,{children:["This steps weren't trivial to figure out. 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This is because we don't want to show a progress bar that is bigger than 100%. We also don't want to show a progress bar that is smaller than 0%."]}),` `,(0,e.jsxs)(n.p,{children:[(0,e.jsx)(n.strong,{children:"The clamp function is a worklet function"}),". This means that it can be executed on the UI thread. This is important because we want to make sure that the progress bar is always updated on the UI thread."]}),` `,(0,e.jsx)(n.p,{children:"The clamp function has been defined inside the utils:"}),` `,(0,e.jsx)(n.div,{className:"remark-code-title",children:"src/section-content-list/utils/clamp.ts"}),` `,(0,e.jsx)(n.pre,{className:"language-tsx",children:(0,e.jsxs)(n.code,{className:"language-tsx code-highlight",children:[(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token keyword",children:"export"})," ",(0,e.jsx)(n.span,{className:"token keyword",children:"const"})," ",(0,e.jsx)(n.span,{className:"token function-variable function",children:"clamp"})," ",(0,e.jsx)(n.span,{className:"token operator",children:"="})," ",(0,e.jsx)(n.span,{className:"token punctuation",children:"("}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[" value",(0,e.jsx)(n.span,{className:"token operator",children:":"})," ",(0,e.jsx)(n.span,{className:"token builtin",children:"number"}),(0,e.jsx)(n.span,{className:"token punctuation",children:","}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[" lowerBound",(0,e.jsx)(n.span,{className:"token operator",children:":"})," ",(0,e.jsx)(n.span,{className:"token builtin",children:"number"}),(0,e.jsx)(n.span,{className:"token punctuation",children:","}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[" upperBound",(0,e.jsx)(n.span,{className:"token operator",children:":"})," ",(0,e.jsx)(n.span,{className:"token builtin",children:"number"}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token punctuation",children:")"})," ",(0,e.jsx)(n.span,{className:"token arrow operator",children:"=>"})," ",(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[" ",(0,e.jsx)(n.span,{className:"token string",children:"'worklet'"}),(0,e.jsx)(n.span,{className:"token punctuation",children:";"}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[" ",(0,e.jsx)(n.span,{className:"token keyword",children:"return"})," ",(0,e.jsx)(n.span,{className:"token known-class-name class-name",children:"Math"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"."}),(0,e.jsx)(n.span,{className:"token method function property-access",children:"min"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"("}),(0,e.jsx)(n.span,{className:"token known-class-name class-name",children:"Math"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"."}),(0,e.jsx)(n.span,{className:"token method function property-access",children:"max"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"("}),"value",(0,e.jsx)(n.span,{className:"token punctuation",children:","})," lowerBound",(0,e.jsx)(n.span,{className:"token punctuation",children:")"}),(0,e.jsx)(n.span,{className:"token punctuation",children:","})," upperBound",(0,e.jsx)(n.span,{className:"token punctuation",children:")"}),(0,e.jsx)(n.span,{className:"token punctuation",children:";"}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token punctuation",children:"}"}),(0,e.jsx)(n.span,{className:"token punctuation",children:";"}),` `]})]})}),` `,(0,e.jsxs)(n.p,{children:["Inside the onScroll event handler, we also check if the ",(0,e.jsx)(n.code,{children:"isResetting"})," value is true. This is because we don't want to update the progress bar while we are resetting it. We will see how we can reset the progress bar in the next section."]}),` `,(0,e.jsxs)(n.p,{children:["You may wonder why I've specified also the ",(0,e.jsx)(n.code,{children:"scrollEventThrottle"})," prop. This is because we want to make sure that the ",(0,e.jsx)(n.strong,{children:"onScroll"})," event is fired only every 16ms. That's needed since we want to run the animation at 60fps (1/60=16ms)."]}),` `,(0,e.jsxs)(n.h2,{id:"the-bottomprogress-component",children:[(0,e.jsx)(n.a,{"aria-hidden":"true",tabIndex:"-1",href:"#the-bottomprogress-component",children:(0,e.jsx)(n.span,{className:"icon icon-link"})}),"The BottomProgress component"]}),` `,(0,e.jsx)(n.p,{children:"This component is responsible for showing the progress bar at the bottom of the screen. It's also responsible for resetting the progress bar when the user taps on it. Here's the interface:"}),` `,(0,e.jsx)(n.pre,{className:"language-tsx",children:(0,e.jsxs)(n.code,{className:"language-tsx code-highlight",children:[(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsxs)(n.span,{className:"token tag",children:[(0,e.jsxs)(n.span,{className:"token tag",children:[(0,e.jsx)(n.span,{className:"token punctuation",children:"<"}),(0,e.jsx)(n.span,{className:"token class-name",children:"BottomProgress"})]}),` `]})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsxs)(n.span,{className:"token tag",children:[" ",(0,e.jsx)(n.span,{className:"token attr-name",children:"readingTime"}),(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[(0,e.jsx)(n.span,{className:"token script-punctuation punctuation",children:"="}),(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),"readingTime",(0,e.jsx)(n.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsxs)(n.span,{className:"token tag",children:[" ",(0,e.jsx)(n.span,{className:"token attr-name",children:"onReset"}),(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[(0,e.jsx)(n.span,{className:"token script-punctuation punctuation",children:"="}),(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),"onReset",(0,e.jsx)(n.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsxs)(n.span,{className:"token tag",children:[" ",(0,e.jsx)(n.span,{className:"token attr-name",children:"progress"}),(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[(0,e.jsx)(n.span,{className:"token script-punctuation punctuation",children:"="}),(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),"progress",(0,e.jsx)(n.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsxs)(n.span,{className:"token tag",children:[" ",(0,e.jsx)(n.span,{className:"token attr-name",children:"style"}),(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[(0,e.jsx)(n.span,{className:"token script-punctuation punctuation",children:"="}),(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"["}),` `]})]})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsx)(n.span,{className:"token tag",children:(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[" ",(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),` `]})})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsx)(n.span,{className:"token tag",children:(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[" position",(0,e.jsx)(n.span,{className:"token operator",children:":"})," 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tag",children:(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[" zIndex",(0,e.jsx)(n.span,{className:"token operator",children:":"})," ",(0,e.jsx)(n.span,{className:"token number",children:"100"}),(0,e.jsx)(n.span,{className:"token punctuation",children:","}),` `]})})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsx)(n.span,{className:"token tag",children:(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[" alignSelf",(0,e.jsx)(n.span,{className:"token operator",children:":"})," ",(0,e.jsx)(n.span,{className:"token string",children:"'center'"}),(0,e.jsx)(n.span,{className:"token punctuation",children:","}),` `]})})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsx)(n.span,{className:"token tag",children:(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[" borderWidth",(0,e.jsx)(n.span,{className:"token operator",children:":"})," ",(0,e.jsx)(n.span,{className:"token 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bottomProgressStyle",(0,e.jsx)(n.span,{className:"token punctuation",children:","}),` `]})})}),(0,e.jsx)(n.span,{className:"code-line",children:(0,e.jsxs)(n.span,{className:"token tag",children:[(0,e.jsxs)(n.span,{className:"token script language-javascript",children:[" ",(0,e.jsx)(n.span,{className:"token punctuation",children:"]"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"}"})]}),` `]})}),(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token tag",children:(0,e.jsx)(n.span,{className:"token punctuation",children:"/>"})}),` `]})]})}),` `,(0,e.jsxs)(n.ul,{children:[` `,(0,e.jsxs)(n.li,{children:["The ",(0,e.jsx)(n.code,{children:"readingTime"})," prop is used to show the reading time of the article."]}),` `,(0,e.jsxs)(n.li,{children:["The ",(0,e.jsx)(n.code,{children:"onReset"})," prop is used to reset the progress bar."]}),` `,(0,e.jsxs)(n.li,{children:["The ",(0,e.jsx)(n.code,{children:"progress"})," prop is used to show the progress bar percentage."]}),` `,(0,e.jsxs)(n.li,{children:["The ",(0,e.jsx)(n.code,{children:"style"})," and the ",(0,e.jsx)(n.code,{children:"bottomProgressStyle"})," props are used to style the component."]}),` `]}),` `,(0,e.jsx)(n.p,{children:"In order to evaluate the readingTime, I've defined another utils function:"}),` `,(0,e.jsx)(n.div,{className:"remark-code-title",children:"src/section-content-list/utils/get-reading-time.ts"}),` `,(0,e.jsx)(n.pre,{className:"language-tsx",children:(0,e.jsxs)(n.code,{className:"language-tsx code-highlight",children:[(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token keyword",children:"export"})," ",(0,e.jsx)(n.span,{className:"token keyword",children:"const"})," ",(0,e.jsx)(n.span,{className:"token function-variable function",children:"getReadingTime"})," ",(0,e.jsx)(n.span,{className:"token operator",children:"="})," ",(0,e.jsx)(n.span,{className:"token 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punctuation",children:"."}),(0,e.jsx)(n.span,{className:"token method function property-access",children:"split"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"("}),(0,e.jsxs)(n.span,{className:"token regex",children:[(0,e.jsx)(n.span,{className:"token regex-delimiter",children:"/"}),(0,e.jsx)(n.span,{className:"token regex-source language-regex",children:(0,e.jsx)(n.span,{className:"token char-set class-name",children:"\\s"})}),(0,e.jsx)(n.span,{className:"token regex-delimiter",children:"/"}),(0,e.jsx)(n.span,{className:"token regex-flags",children:"g"})]}),(0,e.jsx)(n.span,{className:"token punctuation",children:")"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"."}),(0,e.jsx)(n.span,{className:"token property-access",children:"length"}),(0,e.jsx)(n.span,{className:"token punctuation",children:";"}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[" ",(0,e.jsx)(n.span,{className:"token keyword",children:"return"})," ",(0,e.jsx)(n.span,{className:"token known-class-name class-name",children:"Math"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"."}),(0,e.jsx)(n.span,{className:"token method function property-access",children:"ceil"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"("}),"numberOfWords ",(0,e.jsx)(n.span,{className:"token operator",children:"/"})," wordsPerMinute",(0,e.jsx)(n.span,{className:"token punctuation",children:")"}),(0,e.jsx)(n.span,{className:"token punctuation",children:";"}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token punctuation",children:"}"}),(0,e.jsx)(n.span,{className:"token punctuation",children:";"}),` `]})]})}),` `,(0,e.jsxs)(n.h3,{id:"bottomprogress-states",children:[(0,e.jsx)(n.a,{"aria-hidden":"true",tabIndex:"-1",href:"#bottomprogress-states",children:(0,e.jsx)(n.span,{className:"icon icon-link"})}),"BottomProgress States"]}),` `,(0,e.jsx)(n.p,{children:"By checking the animation, we can see that the BottomProgress component has 3 states:"}),` `,(0,e.jsxs)(n.ul,{children:[` `,(0,e.jsxs)(n.li,{children:[(0,e.jsx)(n.strong,{children:"INITIAL"}),": the progress bar is displaying the reading time."]}),` `,(0,e.jsxs)(n.li,{children:[(0,e.jsx)(n.strong,{children:"EXPANDED"}),": the progress bar is displaying the progress percentage."]}),` `,(0,e.jsxs)(n.li,{children:[(0,e.jsx)(n.strong,{children:"END"}),": the progress bar is displaying the reset button (an arrow icon)."]}),` `]}),` `,(0,e.jsxs)(n.p,{children:["In order to handle these states, I've defined a ",(0,e.jsx)(n.code,{children:"state"})," variable called BottomProgressState:"]}),` `,(0,e.jsx)(n.pre,{className:"language-tsx",children:(0,e.jsxs)(n.code,{className:"language-tsx code-highlight",children:[(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token keyword",children:"export"})," ",(0,e.jsx)(n.span,{className:"token keyword",children:"enum"})," ",(0,e.jsx)(n.span,{className:"token maybe-class-name",children:"BottomProgressState"})," ",(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[" ",(0,e.jsx)(n.span,{className:"token constant",children:"INITIAL"}),(0,e.jsx)(n.span,{className:"token punctuation",children:","}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[" ",(0,e.jsx)(n.span,{className:"token constant",children:"EXPANDED"}),(0,e.jsx)(n.span,{className:"token punctuation",children:","}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[" ",(0,e.jsx)(n.span,{className:"token constant",children:"END"}),(0,e.jsx)(n.span,{className:"token punctuation",children:","}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token punctuation",children:"}"}),` `]})]})}),` `,(0,e.jsx)(n.p,{children:"And I've retrieved the state by using the useDerivedValue hook:"}),` `,(0,e.jsx)(n.div,{className:"remark-code-title",children:"src/section-content-list/bottom-progress/index.tsx"}),` `,(0,e.jsx)(n.pre,{className:"language-tsx",children:(0,e.jsxs)(n.code,{className:"language-tsx code-highlight",children:[(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token spread operator",children:"..."}),` `]}),(0,e.jsxs)(n.span,{className:"code-line",children:[(0,e.jsx)(n.span,{className:"token keyword",children:"const"})," state ",(0,e.jsx)(n.span,{className:"token operator",children:"="})," ",(0,e.jsx)(n.span,{className:"token function",children:"useDerivedValue"}),(0,e.jsx)(n.span,{className:"token punctuation",children:"("}),(0,e.jsx)(n.span,{className:"token punctuation",children:"("}),(0,e.jsx)(n.span,{className:"token punctuation",children:")"})," ",(0,e.jsx)(n.span,{className:"token arrow operator",children:"=>"})," ",(0,e.jsx)(n.span,{className:"token punctuation",children:"{"}),` 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