28 lines
726 B
TypeScript
28 lines
726 B
TypeScript
// Copyright 2017-2022 @polkadot/react-hooks authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import { useCallback, useEffect, useState } from 'react';
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import { createNamedHook } from './createNamedHook';
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function useScrollImpl (): number {
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const [scrollY, setScrollY] = useState(window.pageYOffset);
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const setYOffset = useCallback((): void => setScrollY(window.pageYOffset), []);
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useEffect(() => {
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function watchScroll () {
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window.addEventListener('scroll', setYOffset);
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}
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watchScroll();
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return () => {
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window.removeEventListener('scroll', setYOffset);
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};
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}, [setYOffset]);
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return scrollY;
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}
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export const useScroll = createNamedHook('useScroll', useScrollImpl);
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