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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | 19x 19x | import { CSSProperties, ReactElement, useCallback } from "react";
import {
AutoSizer,
IndexRange,
InfiniteLoader,
List,
WindowScroller,
} from "react-virtualized";
interface ItemRendererProps<T> {
key: string;
style: CSSProperties;
index: number;
item: T | undefined;
additionalProps?: Record<string, any>;
}
interface VirtualizedListProps<T> {
items: T[] | null;
totalItems: number;
itemHeight: number;
loadMoreItems?: (range: IndexRange) => Promise<void>;
renderItem: (props: ItemRendererProps<T>) => ReactElement;
isItemLoaded?: (index: number) => boolean;
scrollElementSelector?: string;
overscanRowCount?: number;
additionalProps?: Record<string, any>;
}
export default function VirtualizedList<T>({
items,
totalItems,
itemHeight,
loadMoreItems,
renderItem,
isItemLoaded,
scrollElementSelector = "#right .simplebar-content-wrapper",
overscanRowCount = 2,
}: Readonly<VirtualizedListProps<T>>): ReactElement | null {
const scrollElement =
typeof window !== "undefined"
? (document.querySelector(scrollElementSelector) as HTMLElement)
: undefined;
const defaultIsItemLoaded = useCallback(
(index: number) => !!items?.[index],
[items]
);
const handleLoadMoreRows = useCallback(
async (range: IndexRange) => {
Iif (loadMoreItems) {
await loadMoreItems(range);
}
},
[loadMoreItems]
);
function rowRenderer({
key,
style,
index,
}: {
key: string;
style: CSSProperties;
index: number;
}) {
return renderItem({
key,
style: style,
index,
item: items?.[index],
});
}
Iif (!scrollElement) return null;
return (
<WindowScroller scrollElement={scrollElement}>
{({ height, isScrolling, onChildScroll, scrollTop }) => (
<AutoSizer disableHeight>
{({ width }) => (
<InfiniteLoader
isRowLoaded={({ index }) =>
(isItemLoaded ?? defaultIsItemLoaded)(index)
}
loadMoreRows={handleLoadMoreRows}
rowCount={totalItems}
minimumBatchSize={50}
threshold={100}
>
{({ onRowsRendered, registerChild }) => (
<List
autoHeight
height={height ?? 0}
isScrolling={isScrolling}
onRowsRendered={onRowsRendered}
ref={registerChild}
onScroll={onChildScroll}
overscanRowCount={overscanRowCount}
rowCount={totalItems}
rowHeight={itemHeight}
scrollTop={scrollTop}
width={width}
rowRenderer={rowRenderer}
tabIndex={-1}
/>
)}
</InfiniteLoader>
)}
</AutoSizer>
)}
</WindowScroller>
);
}
|