150 lines
3.0 KiB
JavaScript
150 lines
3.0 KiB
JavaScript
goog.provide('ol.BrowserFeature');
|
|
|
|
goog.require('goog.dom');
|
|
goog.require('goog.dom.TagName');
|
|
goog.require('ol');
|
|
goog.require('ol.dom');
|
|
goog.require('ol.webgl');
|
|
|
|
|
|
/**
|
|
* The ratio between physical pixels and device-independent pixels
|
|
* (dips) on the device (`window.devicePixelRatio`).
|
|
* @const
|
|
* @type {number}
|
|
* @todo api
|
|
*/
|
|
ol.BrowserFeature.DEVICE_PIXEL_RATIO = goog.global.devicePixelRatio || 1;
|
|
|
|
|
|
/**
|
|
* True if the browser supports ArrayBuffers.
|
|
* @const
|
|
* @type {boolean}
|
|
*/
|
|
ol.BrowserFeature.HAS_ARRAY_BUFFER = 'ArrayBuffer' in goog.global;
|
|
|
|
|
|
/**
|
|
* True if the browser's Canvas implementation implements {get,set}LineDash.
|
|
* @type {boolean}
|
|
*/
|
|
ol.BrowserFeature.HAS_CANVAS_LINE_DASH = false;
|
|
|
|
|
|
/**
|
|
* True if browser supports Canvas.
|
|
* @const
|
|
* @type {boolean}
|
|
* @todo api
|
|
*/
|
|
ol.BrowserFeature.HAS_CANVAS = ol.ENABLE_CANVAS && (
|
|
/**
|
|
* @return {boolean} Canvas supported.
|
|
*/
|
|
function() {
|
|
if (!('HTMLCanvasElement' in goog.global)) {
|
|
return false;
|
|
}
|
|
try {
|
|
var context = ol.dom.createCanvasContext2D();
|
|
if (goog.isNull(context)) {
|
|
return false;
|
|
} else {
|
|
if (goog.isDef(context.setLineDash)) {
|
|
ol.BrowserFeature.HAS_CANVAS_LINE_DASH = true;
|
|
}
|
|
return true;
|
|
}
|
|
} catch (e) {
|
|
return false;
|
|
}
|
|
})();
|
|
|
|
|
|
/**
|
|
* Indicates if DeviceOrientation is supported in the user's browser.
|
|
* @const
|
|
* @type {boolean}
|
|
* @todo api
|
|
*/
|
|
ol.BrowserFeature.HAS_DEVICE_ORIENTATION =
|
|
'DeviceOrientationEvent' in goog.global;
|
|
|
|
|
|
/**
|
|
* True if browser supports DOM.
|
|
* @const
|
|
* @type {boolean}
|
|
*/
|
|
ol.BrowserFeature.HAS_DOM = ol.ENABLE_DOM;
|
|
|
|
|
|
/**
|
|
* Is HTML5 geolocation supported in the current browser?
|
|
* @const
|
|
* @type {boolean}
|
|
* @todo api
|
|
*/
|
|
ol.BrowserFeature.HAS_GEOLOCATION = 'geolocation' in goog.global.navigator;
|
|
|
|
|
|
/**
|
|
* @const
|
|
* @type {boolean}
|
|
*/
|
|
ol.BrowserFeature.HAS_JSON_PARSE =
|
|
'JSON' in goog.global && 'parse' in goog.global.JSON;
|
|
|
|
|
|
/**
|
|
* True if browser supports touch events.
|
|
* @const
|
|
* @type {boolean}
|
|
* @todo api
|
|
*/
|
|
ol.BrowserFeature.HAS_TOUCH = ol.ASSUME_TOUCH || 'ontouchstart' in goog.global;
|
|
|
|
|
|
/**
|
|
* True if browser supports pointer events.
|
|
* @const
|
|
* @type {boolean}
|
|
*/
|
|
ol.BrowserFeature.HAS_POINTER = 'PointerEvent' in goog.global;
|
|
|
|
|
|
/**
|
|
* True if browser supports ms pointer events (IE 10).
|
|
* @const
|
|
* @type {boolean}
|
|
*/
|
|
ol.BrowserFeature.HAS_MSPOINTER =
|
|
!!(goog.global.navigator.msPointerEnabled);
|
|
|
|
|
|
/**
|
|
* True if browser supports WebGL.
|
|
* @const
|
|
* @type {boolean}
|
|
* @todo api
|
|
*/
|
|
ol.BrowserFeature.HAS_WEBGL = ol.ENABLE_WEBGL && (
|
|
/**
|
|
* @return {boolean} WebGL supported.
|
|
*/
|
|
function() {
|
|
if (!('WebGLRenderingContext' in goog.global)) {
|
|
return false;
|
|
}
|
|
try {
|
|
var canvas = /** @type {HTMLCanvasElement} */
|
|
(goog.dom.createElement(goog.dom.TagName.CANVAS));
|
|
return !goog.isNull(ol.webgl.getContext(canvas, {
|
|
failIfMajorPerformanceCaveat: true
|
|
}));
|
|
} catch (e) {
|
|
return false;
|
|
}
|
|
})();
|