ad62739a6e
In addition to using const and let, this also upgrades our linter config and removes lint (mostly whitespace).
127 lines
2.4 KiB
JavaScript
127 lines
2.4 KiB
JavaScript
/**
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* @module ol/has
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*/
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import {HAS_WEBGL} from './index.js';
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const _ol_has_ = {};
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const ua = typeof navigator !== 'undefined' ?
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navigator.userAgent.toLowerCase() : '';
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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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_ol_has_.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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_ol_has_.SAFARI = ua.indexOf('safari') !== -1 && ua.indexOf('chrom') == -1;
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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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_ol_has_.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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_ol_has_.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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_ol_has_.DEVICE_PIXEL_RATIO = window.devicePixelRatio || 1;
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/**
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* True if the browser's Canvas implementation implements {get,set}LineDash.
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* @type {boolean}
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*/
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_ol_has_.CANVAS_LINE_DASH = false;
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/**
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* True if the and browsers support Canvas.
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* @const
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* @type {boolean}
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* @api
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*/
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_ol_has_.CANVAS = (
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/**
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* @return {boolean} Canvas supported.
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*/
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function() {
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if (!('HTMLCanvasElement' in window)) {
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return false;
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}
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try {
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const context = document.createElement('CANVAS').getContext('2d');
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if (!context) {
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return false;
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} else {
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if (context.setLineDash !== undefined) {
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_ol_has_.CANVAS_LINE_DASH = true;
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}
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return true;
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}
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} catch (e) {
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return false;
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}
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})();
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/**
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* Is HTML5 geolocation supported in the current browser?
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* @const
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* @type {boolean}
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* @api
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*/
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_ol_has_.GEOLOCATION = 'geolocation' in navigator;
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/**
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* True if browser supports touch events.
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* @const
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* @type {boolean}
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* @api
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*/
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_ol_has_.TOUCH = 'ontouchstart' in window;
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/**
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* True if browser supports pointer events.
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* @const
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* @type {boolean}
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*/
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_ol_has_.POINTER = 'PointerEvent' in window;
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/**
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* True if browser supports ms pointer events (IE 10).
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* @const
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* @type {boolean}
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*/
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_ol_has_.MSPOINTER = !!(navigator.msPointerEnabled);
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/**
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* True if both OpenLayers and browser support WebGL.
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* @const
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* @type {boolean}
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* @api
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*/
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_ol_has_.WEBGL = HAS_WEBGL;
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export default _ol_has_;
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