22 lines
656 B
TypeScript
22 lines
656 B
TypeScript
import { useEffect, useState, type Ref } from "preact/hooks";
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export const useIsVisible = (ref: Ref<HTMLElement>, onlyFirst = false) => {
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const [isVisible, setVisible] = useState(false);
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useEffect(() => {
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if (ref.current) {
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const observer = new IntersectionObserver(([entry]) => {
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setVisible(entry.isIntersecting);
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if (entry.isIntersecting && onlyFirst) {
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observer.disconnect();
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}
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});
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observer.observe(ref.current);
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return () => observer.disconnect();
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}
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}, [ref.current, onlyFirst]);
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return isVisible;
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} |