53 lines
1.5 KiB
JavaScript
53 lines
1.5 KiB
JavaScript
/*
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Copyright 2022 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 React, { useEffect, useState } from "react";
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function leftPad(value) {
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return value < 10 ? "0" + value : value;
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}
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function formatTime(msElapsed) {
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const secondsElapsed = msElapsed / 1000;
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const hours = Math.floor(secondsElapsed / 3600);
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const minutes = Math.floor(secondsElapsed / 60) - hours * 60;
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const seconds = Math.floor(secondsElapsed - hours * 3600 - minutes * 60);
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return `${leftPad(hours)}:${leftPad(minutes)}:${leftPad(seconds)}`;
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}
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export function Timer({ value }) {
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const [timestamp, setTimestamp] = useState();
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useEffect(() => {
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const startTimeMs = performance.now();
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let animationFrame;
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function onUpdate(curTimeMs) {
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const msElapsed = curTimeMs - startTimeMs;
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setTimestamp(formatTime(msElapsed));
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animationFrame = requestAnimationFrame(onUpdate);
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}
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onUpdate(startTimeMs);
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return () => {
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cancelAnimationFrame(animationFrame);
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};
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}, [value]);
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return <p>{timestamp}</p>;
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}
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