100 lines
2 KiB
TypeScript
100 lines
2 KiB
TypeScript
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import React from 'react';
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// import classNames from 'classnames';
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interface Props {
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duration: number;
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expiresAt: number;
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onComplete?: () => unknown;
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}
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interface State {
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ratio: number;
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}
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const CIRCUMFERENCE = 11.013 * 2 * Math.PI;
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export class Countdown extends React.Component<Props, State> {
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public looping = false;
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constructor(props: Props) {
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super(props);
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const { duration, expiresAt } = this.props;
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const ratio = getRatio(expiresAt, duration);
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this.state = { ratio };
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}
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public componentDidMount() {
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this.startLoop();
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}
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public componentDidUpdate() {
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this.startLoop();
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}
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public componentWillUnmount() {
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this.stopLoop();
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}
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public startLoop() {
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if (this.looping) {
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return;
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}
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this.looping = true;
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requestAnimationFrame(this.loop);
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}
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public stopLoop() {
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this.looping = false;
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}
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public loop = () => {
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const { onComplete, duration, expiresAt } = this.props;
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if (!this.looping) {
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return;
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}
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const ratio = getRatio(expiresAt, duration);
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this.setState({ ratio });
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if (ratio === 1) {
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this.looping = false;
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if (onComplete) {
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onComplete();
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}
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} else {
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requestAnimationFrame(this.loop);
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}
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};
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public render() {
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const { ratio } = this.state;
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const strokeDashoffset = ratio * CIRCUMFERENCE;
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return (
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<svg className="module-countdown" viewBox="0 0 24 24">
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<path
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d="M12,1 A11,11,0,1,1,1,12,11.013,11.013,0,0,1,12,1Z"
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className="module-countdown__path"
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style={{
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strokeDasharray: `${CIRCUMFERENCE}, ${CIRCUMFERENCE}`,
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strokeDashoffset,
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}}
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/>
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</svg>
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);
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}
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}
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function getRatio(expiresAt: number, duration: number) {
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const start = expiresAt - duration;
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const end = expiresAt;
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const now = Date.now();
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const totalTime = end - start;
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const elapsed = now - start;
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return Math.min(Math.max(0, elapsed / totalTime), 1);
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}
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