/
useLazyKVMap.ts
54 lines (45 loc) · 1.36 KB
/
useLazyKVMap.ts
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import * as React from 'react';
import { Key, GetRowKey } from '../interface';
interface MapCache<RecordType> {
data?: RecordType[];
childrenColumnName?: string;
kvMap?: Map<Key, RecordType>;
getRowKey?: Function;
}
export default function useLazyKVMap<RecordType>(
data: RecordType[],
childrenColumnName: string,
getRowKey: GetRowKey<RecordType>,
) {
const mapCacheRef = React.useRef<MapCache<RecordType>>({});
function getRecordByKey(key: Key): RecordType {
if (
!mapCacheRef.current ||
mapCacheRef.current.data !== data ||
mapCacheRef.current.childrenColumnName !== childrenColumnName ||
mapCacheRef.current.getRowKey !== getRowKey
) {
const kvMap = new Map<Key, RecordType>();
/* eslint-disable no-inner-declarations */
function dig(records: RecordType[]) {
records.forEach((record, index) => {
const rowKey = getRowKey(record, index);
kvMap.set(rowKey, record);
if (record && typeof record === 'object' && childrenColumnName in record) {
dig((record as any)[childrenColumnName] || []);
}
});
}
/* eslint-enable */
dig(data);
mapCacheRef.current = {
data,
childrenColumnName,
kvMap,
getRowKey,
};
}
return mapCacheRef.current.kvMap!.get(key)!;
}
return [getRecordByKey];
}