张翔
42 lines
1.1 KiB
TypeScript
42 lines
1.1 KiB
TypeScript
'use client';
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import { useState, useEffect, useRef, type RefObject } from 'react';
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interface UseIntersectionObserverOptions {
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threshold?: number | number[];
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root?: Element | null;
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rootMargin?: string;
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freezeOnceVisible?: boolean;
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}
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export function useIntersectionObserver<T extends Element>(
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options: UseIntersectionObserverOptions = {}
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): [RefObject<T | null>, boolean] {
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const { threshold = 0, root = null, rootMargin = '0px', freezeOnceVisible = false } = options;
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const elementRef = useRef<T | null>(null);
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const [isIntersecting, setIsIntersecting] = useState(false);
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useEffect(() => {
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const element = elementRef.current;
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if (!element) return;
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if (freezeOnceVisible && isIntersecting) return;
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const observer = new IntersectionObserver(
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([entry]) => {
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setIsIntersecting(entry.isIntersecting);
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},
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{ threshold, root, rootMargin }
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);
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observer.observe(element);
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return () => {
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observer.disconnect();
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};
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}, [threshold, root, rootMargin, freezeOnceVisible, isIntersecting]);
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return [elementRef, isIntersecting];
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}
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