Optimize memo of Stream.tsx
The Stream only has to re-render when 'stream.length' changes, but could be re-rendered by a parent in scenarios where 'stream.length' has not changed. This change optimizes that scenario by only re-rendering the stream when 'stream.length' changes.
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1 changed files with 33 additions and 33 deletions
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@ -26,9 +26,11 @@ export function Stream({
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const className = classNames("body", "stream");
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const style: React.CSSProperties =
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endOfStream || isPaused ? { overflowY: "auto" } : { overflowY: "hidden" };
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const ul = useRef<HTMLUListElement>();
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const ayat = useMemo<JSX.Element[]>(() => {
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return stream.map((ayah: Quran.Ayah) => {
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const ref = useRef<HTMLUListElement>();
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const ul = useMemo<JSX.Element>(() => {
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return (
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<ul lang={locale} className={className} style={style} ref={ref}>
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{stream.map((ayah: Quran.Ayah) => {
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return (
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<li key={ayah.id} className="ayah fade">
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<span className="title">
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@ -49,21 +51,19 @@ export function Stream({
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<p>{ayah.text}</p>
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</li>
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);
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});
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})}
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</ul>
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);
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}, [stream.length]);
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useEffect(() => {
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const el = ul.current;
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const el = ref.current;
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if (el) {
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const top = el.scrollHeight + el.scrollTop;
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el.scrollTo({ behavior: "smooth", top });
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const top = 1024 + el.scrollHeight + el.scrollTop;
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el.scrollBy({ behavior: "smooth", top });
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el.scrollIntoView({ behavior: "smooth" });
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}
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}, [ul.current, stream.length]);
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}, [stream.length]);
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return (
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<ul lang={locale} className={className} style={style} ref={ul}>
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{ayat}
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</ul>
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);
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return ul;
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}
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