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/*
* SPDX-FileCopyrightText: 2023 Kristóf Marussy
*
* SPDX-License-Identifier: MIT
*/
import { type ReactNode, useEffect, useCallback, useRef } from 'react';
import { useActiveSection } from './ActiveSectionProvider';
export default function TrackActiveSection({
children,
}: {
children: ReactNode;
}) {
const { setHash } = useActiveSection();
const elementRef = useRef<HTMLDivElement | null>(null);
const callback = useCallback(() => {
const { current: element } = elementRef;
if (!element) {
return;
}
const currentID = Array.from(element.children)
.reverse()
.find((child) => child.getBoundingClientRect().top <= 60)?.id;
const currentHash =
currentID === undefined || currentID === '' ? '' : `#${currentID}`;
setHash(currentHash);
}, [setHash]);
const setElement = useCallback(
(element: HTMLDivElement | null) => {
elementRef.current = element;
if (element) {
callback();
} else {
setHash(undefined);
}
},
[setHash],
);
useEffect(() => {
window.addEventListener('scroll', callback);
return () => window.removeEventListener('scroll', callback);
});
return <div ref={setElement}>{children}</div>;
}
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