25 lines
622 B
TypeScript
25 lines
622 B
TypeScript
export class DeltaTimeCalculator {
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private previousTime: DOMHighResTimeStamp | null = null;
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constructor() {
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document.addEventListener('visibilitychange', this.handleVisibilityChange.bind(this));
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}
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public calculateDeltaTimeInSeconds(
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currentTime: DOMHighResTimeStamp
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): DOMHighResTimeStamp {
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if (this.previousTime === null) {
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this.previousTime = currentTime;
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}
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const delta = currentTime - this.previousTime;
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this.previousTime = currentTime;
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return delta / 1000;
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}
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private handleVisibilityChange() {
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if (!document.hidden) {
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this.previousTime = null;
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}
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}
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}
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