36 lines
1.3 KiB
TypeScript
36 lines
1.3 KiB
TypeScript
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/*
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Copyright 2022 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import { useCallback, useRef } from "react";
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/**
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* Hook to prevent a slower response to an earlier query overwriting the result to a faster response of a later query
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* @param onResultChanged
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*/
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export const useLatestResult = <T, R>(onResultChanged: (result: R) => void):
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[(query: T | null) => void, (query: T | null, result: R) => void] => {
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const ref = useRef<T | null>(null);
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const setQuery = useCallback((query: T | null) => {
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ref.current = query;
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}, []);
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const setResult = useCallback((query: T | null, result: R) => {
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if (ref.current === query) {
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onResultChanged(result);
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}
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}, [onResultChanged]);
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return [setQuery, setResult];
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};
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