38 lines
877 B
TypeScript
38 lines
877 B
TypeScript
// Copyright 2022 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { useEffect, useState } from 'react';
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import { MINUTE } from '../util/durations/index.js';
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const listeners = new Set<() => void>();
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let timer: ReturnType<typeof setInterval> | undefined;
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export function useNowThatUpdatesEveryMinute(): number {
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const [now, setNow] = useState(Date.now());
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useEffect(() => {
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const updateNow = () => setNow(Date.now());
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updateNow();
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if (listeners.size === 0 && timer == null) {
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timer = setInterval(() => {
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for (const fn of listeners) {
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fn();
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}
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}, MINUTE);
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}
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listeners.add(updateNow);
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return () => {
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listeners.delete(updateNow);
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if (listeners.size === 0 && timer != null) {
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clearInterval(timer);
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timer = undefined;
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}
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};
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}, []);
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return now;
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}
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