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// @flow
import { useState, useEffect } from 'react';
export const useAppScroller = () => {
const [ref, setRef] = useState(null);
useEffect(() => {
if (!ref) setRef(document.getElementById('main'));
});
const scrollToTop = () => {
const elem = ref || document.getElementById('main');
if (elem) return (elem.scrollTop = 0);
};
const scrollToBottom = () => {
const elem = ref || document.getElementById('main');
if (elem) return (elem.scrollTop = elem.scrollHeight - elem.clientHeight);
};
const scrollTo = (pos: number) => {
const elem = ref || document.getElementById('main');
if (elem) return (elem.scrollTop = pos);
};
return { scrollToTop, scrollTo, scrollToBottom, ref };
};
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