@21epub/epub-thirdparty
Version:
epub-thirdparty
29 lines (28 loc) • 1.11 kB
JavaScript
/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { globals } from './platform.js';
const hasPerformanceNow = (globals.performance && typeof globals.performance.now === 'function');
export class StopWatch {
constructor(highResolution) {
this._highResolution = hasPerformanceNow && highResolution;
this._startTime = this._now();
this._stopTime = -1;
}
static create(highResolution = true) {
return new StopWatch(highResolution);
}
stop() {
this._stopTime = this._now();
}
elapsed() {
if (this._stopTime !== -1) {
return this._stopTime - this._startTime;
}
return this._now() - this._startTime;
}
_now() {
return this._highResolution ? globals.performance.now() : Date.now();
}
}