Tristan Yang
49 lines
1.1 KiB
TypeScript
49 lines
1.1 KiB
TypeScript
import { useRef, useEffect, FC } from "react";
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import styled from "styled-components";
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import { Waveform } from "@uiball/loaders";
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const Styled = styled.div`
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margin-top: 80px;
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display: flex;
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justify-content: center;
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align-items: center;
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width: 100%;
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padding: 30px 0;
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`;
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type Props = {
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pullUp: () => Promise<void> | null;
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};
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const LoadMore: FC<Props> = ({ pullUp = null }) => {
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const ref = useRef<HTMLDivElement>();
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useEffect(() => {
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const observer = new IntersectionObserver(
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(entries) => {
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entries.forEach((entry) => {
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const intersecting = entry.isIntersecting;
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// const currEle = entry.target;
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if (intersecting && pullUp) {
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// load more
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pullUp();
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}
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});
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},
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{ threshold: 0 }
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);
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const currEle = ref?.current;
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if (currEle) {
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observer.observe(currEle);
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}
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return () => {
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if (currEle) {
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observer.unobserve(currEle);
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}
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};
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}, [ref, pullUp]);
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return (
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<Styled ref={ref}>
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<Waveform size={24} lineWeight={5} speed={1} color="#ccc" />
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</Styled>
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);
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};
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export default LoadMore;
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