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leaflet fork for copy edit / bug fixes forked from leaflet.pub/leaflet
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TypeScript
at perf/paste
123456789101112131415161718192021222324import { useRef, useEffect } from "react";
let scrollPositions: { [key: string]: number } = {};export function usePreserveScroll<T extends HTMLElement>(key: string | null) { let ref = useRef<T | null>(null); useEffect(() => { if (!ref.current || !key) return;
if (scrollPositions[key] !== undefined) window.requestAnimationFrame(() => { ref.current?.scrollTo({ top: scrollPositions[key] || 0 }); });
const listener = () => { if (!ref.current?.scrollTop) return; scrollPositions[key] = ref.current.scrollTop; };
ref.current.addEventListener("scroll", listener); return () => ref.current?.removeEventListener("scroll", listener); }, [key, ref.current]); return { ref };}