27 lines
969 B
TypeScript
27 lines
969 B
TypeScript
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import type { ComputedRef, Ref } from 'vue';
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import { ref } from 'vue';
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import { watchEffect } from 'vue';
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import type { FlattenDataNode, Key, RawValueType } from '../interface';
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/**
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* Return cached Key Value map with DataNode.
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* Only re-calculate when `flattenOptions` changed.
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*/
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export default function useKeyValueMap(flattenOptions: ComputedRef<FlattenDataNode[]>) {
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const cacheKeyMap: Ref<Map<Key, FlattenDataNode>> = ref(new Map());
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const cacheValueMap: Ref<Map<RawValueType, FlattenDataNode>> = ref(new Map());
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watchEffect(() => {
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const newCacheKeyMap = new Map();
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const newCacheValueMap = new Map();
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// Cache options by key
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flattenOptions.value.forEach((dataNode: FlattenDataNode) => {
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newCacheKeyMap.set(dataNode.key, dataNode);
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newCacheValueMap.set(dataNode.data.value, dataNode);
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});
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cacheKeyMap.value = newCacheKeyMap;
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cacheValueMap.value = newCacheValueMap;
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});
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return [cacheKeyMap, cacheValueMap];
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}
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