491f0cd08a
* Copyright headers 1 * Licence headers 2 * Copyright Headers 3 * Copyright Headers 4 * Copyright Headers 5 * Copyright Headers 6 * Copyright headers 7 * Add copyright headers for html and config file * Replace license files and update package.json * Update with CLA * lint
32 lines
1.1 KiB
TypeScript
32 lines
1.1 KiB
TypeScript
/*
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Copyright 2024 New Vector Ltd.
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Copyright 2020 The Matrix.org Foundation C.I.C.
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SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
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Please see LICENSE files in the repository root for full details.
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*/
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import { useEffect, useRef } from "react";
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import { ActionPayload } from "../dispatcher/payloads";
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import { MatrixDispatcher } from "../dispatcher/dispatcher";
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// Hook to simplify listening to event dispatches
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export const useDispatcher = (dispatcher: MatrixDispatcher, handler: (payload: ActionPayload) => void): void => {
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// Create a ref that stores handler
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const savedHandler = useRef((payload: ActionPayload) => {});
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// Update ref.current value if handler changes.
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useEffect(() => {
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savedHandler.current = handler;
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}, [handler]);
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useEffect(() => {
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// Create event listener that calls handler function stored in ref
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const ref = dispatcher.register((payload) => savedHandler.current(payload));
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// Remove event listener on cleanup
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return () => {
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dispatcher.unregister(ref);
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};
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}, [dispatcher]);
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};
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