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
34 lines
1.1 KiB
TypeScript
34 lines
1.1 KiB
TypeScript
/*
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Copyright 2024 New Vector Ltd.
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Copyright 2022 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 { FocusEvent, useCallback, useEffect, useRef, useState } from "react";
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export function useIsFocused(): {
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isFocused: boolean;
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onFocus(event: FocusEvent<HTMLElement>): void;
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} {
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const [isFocused, setIsFocused] = useState(false);
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const timeoutIDRef = useRef<number>();
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useEffect(() => () => clearTimeout(timeoutIDRef.current), [timeoutIDRef]);
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const onFocus = useCallback(
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(event: FocusEvent<HTMLElement>) => {
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clearTimeout(timeoutIDRef.current);
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if (event.type === "focus") {
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setIsFocused(true);
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} else {
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// To avoid a blink when we switch mode between plain text and rich text mode
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// We delay the unfocused action
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timeoutIDRef.current = window.setTimeout(() => setIsFocused(false), 100);
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}
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},
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[setIsFocused, timeoutIDRef],
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);
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return { isFocused, onFocus };
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}
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