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Optimize memo of Stream.tsx

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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.
This commit is contained in:
0x1eef 2023-12-04 01:59:13 -03:00
parent 1a7af1be2a
commit 46850a8cfb
1 changed files with 33 additions and 33 deletions
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66
src/js/components/Stream.tsx
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@ -26,44 +26,44 @@ export function Stream({
const className = classNames("body", "stream");
const style: React.CSSProperties =
endOfStream || isPaused ? { overflowY: "auto" } : { overflowY: "hidden" };
const ul = useRef<HTMLUListElement>();
const ayat = useMemo<JSX.Element[]>(() => {
return stream.map((ayah: Quran.Ayah) => {
return (
<li key={ayah.id} className="ayah fade">
<span className="title">
{(isPaused || endOfStream) && (
<AudioControl
recitation={recitation}
surah={surah}
ayah={ayah}
onEnd={turnOffSound => turnOffSound()}
/>
)}
<span>
{t(locale, "surah")} {formatNumber(surah.id, locale)}
{t(locale, "comma")} {t(locale, "ayah")}{" "}
{formatNumber(ayah.id, locale)}
</span>
</span>
<p>{ayah.text}</p>
</li>
);
});
const ref = useRef<HTMLUListElement>();
const ul = useMemo<JSX.Element>(() => {
return (
<ul lang={locale} className={className} style={style} ref={ref}>
{stream.map((ayah: Quran.Ayah) => {
return (
<li key={ayah.id} className="ayah fade">
<span className="title">
{(isPaused || endOfStream) && (
<AudioControl
recitation={recitation}
surah={surah}
ayah={ayah}
onEnd={turnOffSound => turnOffSound()}
/>
)}
<span>
{t(locale, "surah")} {formatNumber(surah.id, locale)}
{t(locale, "comma")} {t(locale, "ayah")}{" "}
{formatNumber(ayah.id, locale)}
</span>
</span>
<p>{ayah.text}</p>
</li>
);
})}
</ul>
);
}, [stream.length]);
useEffect(() => {
const el = ul.current;
const el = ref.current;
if (el) {
const top = el.scrollHeight + el.scrollTop;
el.scrollTo({ behavior: "smooth", top });
const top = 1024 + el.scrollHeight + el.scrollTop;
el.scrollBy({ behavior: "smooth", top });
el.scrollIntoView({ behavior: "smooth" });
}
}, [ul.current, stream.length]);
}, [stream.length]);
return (
<ul lang={locale} className={className} style={style} ref={ul}>
{ayat}
</ul>
);
return ul;
}