91 lines
2.1 KiB
JavaScript
91 lines
2.1 KiB
JavaScript
/**
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* @module ol/has
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*/
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const ua =
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typeof navigator !== 'undefined' && typeof navigator.userAgent !== 'undefined'
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? navigator.userAgent.toLowerCase()
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: '';
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/**
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* User agent string says we are dealing with Firefox as browser.
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* @type {boolean}
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*/
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export const FIREFOX = ua.indexOf('firefox') !== -1;
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/**
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* User agent string says we are dealing with Safari as browser.
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* @type {boolean}
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*/
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export const SAFARI = ua.indexOf('safari') !== -1 && ua.indexOf('chrom') == -1;
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/**
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* https://bugs.webkit.org/show_bug.cgi?id=237906
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* @type {boolean}
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*/
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export const SAFARI_BUG_237906 =
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SAFARI &&
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!!(
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ua.indexOf('version/15.4') >= 0 ||
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ua.match(/cpu (os|iphone os) 15_4 like mac os x/)
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);
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/**
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* User agent string says we are dealing with a WebKit engine.
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* @type {boolean}
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*/
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export const WEBKIT = ua.indexOf('webkit') !== -1 && ua.indexOf('edge') == -1;
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/**
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* User agent string says we are dealing with a Mac as platform.
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* @type {boolean}
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*/
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export const MAC = ua.indexOf('macintosh') !== -1;
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/**
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* The ratio between physical pixels and device-independent pixels
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* (dips) on the device (`window.devicePixelRatio`).
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* @const
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* @type {number}
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* @api
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*/
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export const DEVICE_PIXEL_RATIO =
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typeof devicePixelRatio !== 'undefined' ? devicePixelRatio : 1;
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/**
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* The execution context is a worker with OffscreenCanvas available.
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* @const
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* @type {boolean}
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*/
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export const WORKER_OFFSCREEN_CANVAS =
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typeof WorkerGlobalScope !== 'undefined' &&
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typeof OffscreenCanvas !== 'undefined' &&
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self instanceof WorkerGlobalScope; //eslint-disable-line
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/**
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* Image.prototype.decode() is supported.
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* @type {boolean}
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*/
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export const IMAGE_DECODE =
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typeof Image !== 'undefined' && Image.prototype.decode;
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/**
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* @type {boolean}
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*/
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export const PASSIVE_EVENT_LISTENERS = (function () {
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let passive = false;
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try {
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const options = Object.defineProperty({}, 'passive', {
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get: function () {
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passive = true;
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},
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});
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window.addEventListener('_', null, options);
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window.removeEventListener('_', null, options);
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} catch (error) {
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// passive not supported
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}
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return passive;
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})();
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