74 lines
1.8 KiB
TypeScript
74 lines
1.8 KiB
TypeScript
import { ReactNode, useEffect, useRef, useState } from "react";
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import { Box } from "@mantine/core";
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interface InfiniteScrollProps<T> {
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items: T[];
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renderItem: (item: T, index: number) => ReactNode;
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batchSize?: number;
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initialCount?: number;
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rootMargin?: string;
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loader?: ReactNode;
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hasMore?: boolean;
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loading?: boolean;
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onLoadMore?: () => void;
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}
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const InfiniteScroll = <T,>({
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items,
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renderItem,
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batchSize = 25,
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initialCount = batchSize,
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rootMargin = "600px 0px",
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loader,
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hasMore = false,
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loading = false,
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onLoadMore,
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}: InfiniteScrollProps<T>) => {
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const [visibleCount, setVisibleCount] = useState(initialCount);
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const [prevItems, setPrevItems] = useState(items);
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const sentinelRef = useRef<HTMLDivElement>(null);
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if (prevItems !== items) {
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setPrevItems(items);
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setVisibleCount(initialCount);
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}
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const hasHiddenItems = visibleCount < items.length;
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const showLoader = hasHiddenItems || hasMore || loading;
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useEffect(() => {
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const sentinel = sentinelRef.current;
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if (!sentinel) return;
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const observer = new IntersectionObserver(
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(entries) => {
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if (!entries.some((entry) => entry.isIntersecting)) return;
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if (visibleCount < items.length) {
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setVisibleCount((count) => Math.min(count + batchSize, items.length));
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} else if (hasMore && !loading) {
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onLoadMore?.();
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}
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},
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{ rootMargin }
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);
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observer.observe(sentinel);
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return () => observer.disconnect();
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}, [items, visibleCount, batchSize, hasMore, loading, onLoadMore, rootMargin]);
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return (
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<>
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{items.slice(0, visibleCount).map((item, index) => renderItem(item, index))}
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{showLoader && (
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<>
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<Box ref={sentinelRef} />
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{loader}
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</>
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)}
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</>
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);
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};
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export default InfiniteScroll;
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