34 lines
1.1 KiB
JavaScript
34 lines
1.1 KiB
JavaScript
// @flow
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import { getThumbnailCdnUrl } from 'util/thumbnail';
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import React from 'react';
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// $FlowFixMe cannot resolve ...
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import FileRenderPlaceholder from 'static/img/fileRenderPlaceholder.png';
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export default function useThumbnail(claimThumbnail: ?string, containerRef: any) {
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const [thumbnail, setThumbnail] = React.useState(FileRenderPlaceholder);
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React.useEffect(() => {
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if (!claimThumbnail) {
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return setThumbnail(FileRenderPlaceholder);
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}
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const timer = setTimeout(() => {
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let newThumbnail = claimThumbnail;
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// generate the thumbnail url served by the cdn
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if (containerRef.current?.parentElement?.offsetWidth) {
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const w = containerRef.current.parentElement.offsetWidth;
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newThumbnail = getThumbnailCdnUrl({ thumbnail: newThumbnail, width: w, height: w });
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}
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// update new thumbnail in state
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if (newThumbnail !== thumbnail) {
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setThumbnail(newThumbnail);
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}
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}, 200);
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return () => clearTimeout(timer);
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}, [claimThumbnail, containerRef, thumbnail]);
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return thumbnail;
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}
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