39 lines
1.4 KiB
TypeScript
39 lines
1.4 KiB
TypeScript
/*
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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 { FocusEvent, useCallback, useEffect, useRef, useState } from "react";
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export function useIsFocused() {
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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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