34 lines
825 B
TypeScript
34 lines
825 B
TypeScript
import throttle from "lodash.throttle";
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import { useEffect } from "react";
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import { atom, useAtom } from "../editor-jotai";
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const scrollPositionAtom = atom<number>(0);
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export const useScrollPosition = <T extends HTMLElement>(
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elementRef: React.RefObject<T | null>,
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) => {
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const [scrollPosition, setScrollPosition] = useAtom(scrollPositionAtom);
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useEffect(() => {
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const { current: element } = elementRef;
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if (!element) {
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return;
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}
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const handleScroll = throttle(() => {
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const { scrollTop } = element;
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setScrollPosition(scrollTop);
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}, 200);
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element.addEventListener("scroll", handleScroll);
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return () => {
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handleScroll.cancel();
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element.removeEventListener("scroll", handleScroll);
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};
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}, [elementRef, setScrollPosition]);
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return scrollPosition;
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};
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