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Merge pull request #274 from slytter/master
Add preloading to stories
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node_modules | ||
dist | ||
stats.json | ||
report.html | ||
report.html | ||
.idea |
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import {Story} from "../interfaces"; | ||
import {useEffect} from "react"; | ||
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// Caches given Story[] using HTMLImageElement and HTMLVideoElement | ||
const cacheContent = async (contents: Story[]) => { | ||
const promises = contents.map((content) => { | ||
return new Promise(function (resolve, reject) { | ||
if(!content.url) return | ||
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if(content.type === 'video') { | ||
const video = document.createElement('video'); | ||
video.src = content.url; | ||
video.onloadeddata = resolve; | ||
video.onerror = reject; | ||
return; | ||
} | ||
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const img = new Image(); | ||
img.src = content.url; | ||
img.onload = resolve; | ||
img.onerror = reject; | ||
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}) | ||
}) | ||
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await Promise.all(promises); | ||
} | ||
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// Keeps track of urls that have been loaded | ||
const urlsLoaded = new Set<string>(); | ||
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// Pushes urls to urlsLoaded | ||
const markUrlsLoaded = (contents: Story[]) => { | ||
contents.forEach((content) => { | ||
urlsLoaded.add(content.url) | ||
}) | ||
} | ||
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// Returns true if given Story should be preloaded | ||
const shouldPreload = (content: Story) => { | ||
if (!content.url) return false | ||
if (urlsLoaded.has(content.url)) return false | ||
if (content.preloadResource !== undefined) return content.preloadResource | ||
if (content.type === 'video') return false | ||
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return true | ||
} | ||
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// Preloads images and videos from given Story[] using a cursor and preloadCount | ||
// Preload count is the number of images/videos to preload after the cursor | ||
// Cursor is the current index to start preloading from | ||
export const usePreLoader = (contents: Story[], cursor: number, preloadCount: number) => { | ||
useEffect(() => { | ||
const start = cursor + 1; | ||
const end = cursor + preloadCount + 1; | ||
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const toPreload = contents | ||
.slice(start, end) | ||
.filter(shouldPreload); | ||
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markUrlsLoaded(toPreload) | ||
cacheContent(toPreload) | ||
}, [cursor, preloadCount, contents]) | ||
} |
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Successfully deployed to the following URLs:
react-insta-stories – ./
react-insta-stories-git-master-mohitk05.vercel.app
react-insta-stories.vercel.app
react-insta-stories-mohitk05.vercel.app