heli-agri/lib/has.js

HeliAgri is a high-performance, feature-packed library for creating interactive maps on the web. It can display map tiles, vector data and markers loaded from any source on any web page. OpenLayers has been developed to further the use of geographic infor

/**
 * @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;
})();