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useRef / useMemo in Stream.tsx

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0x1eef 2023-12-04 01:36:58 -03:00
parent f2db229dd0
commit 1a7af1be2a
1 changed files with 34 additions and 28 deletions
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62
src/js/components/Stream.tsx
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@ -1,4 +1,4 @@
import React, { useEffect } from "react";
import React, { useEffect, useMemo, useRef } from "react";
import * as Quran from "lib/Quran";
import { AudioControl } from "components/AudioControl";
import { formatNumber, TFunction } from "lib/i18n";
@ -26,37 +26,43 @@ export function Stream({
const className = classNames("body", "stream");
const style: React.CSSProperties =
endOfStream || isPaused ? { overflowY: "auto" } : { overflowY: "hidden" };
const ayat = 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)}
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>
</span>
<p>{ayah.text}</p>
</li>
);
});
useEffect(() => {
const ul: HTMLElement = document.querySelector("ul.stream")!;
const top = ul.offsetHeight + ul.scrollTop;
ul.scrollBy({ behavior: "smooth", top });
<p>{ayah.text}</p>
</li>
);
});
}, [stream.length]);
useEffect(() => {
const el = ul.current;
if (el) {
const top = el.scrollHeight + el.scrollTop;
el.scrollTo({ behavior: "smooth", top });
el.scrollIntoView({ behavior: "smooth" });
}
}, [ul.current, stream.length]);
return (
<ul lang={locale} className={className} style={style}>
<ul lang={locale} className={className} style={style} ref={ul}>
{ayat}
</ul>
);