helimap
Version:
map heliware
89 lines (77 loc) • 2.2 kB
JavaScript
/**
* @module ol/has
*/
const ua =
typeof navigator !== 'undefined' && typeof navigator.userAgent !== 'undefined'
? navigator.userAgent.toLowerCase()
: '';
/**
* User agent string says we are dealing with Firefox as browser.
* @type {boolean}
*/
export const FIREFOX = ua.includes('firefox');
/**
* User agent string says we are dealing with Safari as browser.
* @type {boolean}
*/
export const SAFARI = ua.includes('safari') && !ua.includes('chrom');
/**
* https://bugs.webkit.org/show_bug.cgi?id=237906
* @type {boolean}
*/
export const SAFARI_BUG_237906 =
SAFARI &&
(ua.includes('version/15.4') ||
/cpu (os|iphone os) 15_4 like mac os x/.test(ua));
/**
* User agent string says we are dealing with a WebKit engine.
* @type {boolean}
*/
export const WEBKIT = ua.includes('webkit') && !ua.includes('edge');
/**
* User agent string says we are dealing with a Mac as platform.
* @type {boolean}
*/
export const MAC = ua.includes('macintosh');
/**
* The ratio between physical pixels and device-independent pixels
* (dips) on the device (`window.devicePixelRatio`).
* @const
* @type {number}
* @api
*/
export const DEVICE_PIXEL_RATIO =
typeof devicePixelRatio !== 'undefined' ? devicePixelRatio : 1;
/**
* The execution context is a worker with OffscreenCanvas available.
* @const
* @type {boolean}
*/
export const WORKER_OFFSCREEN_CANVAS =
typeof WorkerGlobalScope !== 'undefined' &&
typeof OffscreenCanvas !== 'undefined' &&
self instanceof WorkerGlobalScope; //eslint-disable-line
/**
* Image.prototype.decode() is supported.
* @type {boolean}
*/
export const IMAGE_DECODE =
typeof Image !== 'undefined' && Image.prototype.decode;
/**
* @type {boolean}
*/
export const PASSIVE_EVENT_LISTENERS = (function () {
let passive = false;
try {
const options = Object.defineProperty({}, 'passive', {
get: function () {
passive = true;
},
});
window.addEventListener('_', null, options);
window.removeEventListener('_', null, options);
} catch (error) {
// passive not supported
}
return passive;
})();