| // Copyright 2010 The Closure Library Authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS-IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| /** |
| * @fileoverview Browser capability checks for the events package. |
| * |
| */ |
| |
| |
| goog.provide('goog.events.BrowserFeature'); |
| |
| goog.require('goog.userAgent'); |
| |
| |
| /** |
| * Enum of browser capabilities. |
| * @enum {boolean} |
| */ |
| goog.events.BrowserFeature = { |
| /** |
| * Whether the button attribute of the event is W3C compliant. False in |
| * Internet Explorer prior to version 9; document-version dependent. |
| */ |
| HAS_W3C_BUTTON: !goog.userAgent.IE || |
| goog.userAgent.isDocumentModeOrHigher(9), |
| |
| /** |
| * Whether the browser supports full W3C event model. |
| */ |
| HAS_W3C_EVENT_SUPPORT: !goog.userAgent.IE || |
| goog.userAgent.isDocumentModeOrHigher(9), |
| |
| /** |
| * To prevent default in IE7-8 for certain keydown events we need set the |
| * keyCode to -1. |
| */ |
| SET_KEY_CODE_TO_PREVENT_DEFAULT: goog.userAgent.IE && |
| !goog.userAgent.isVersionOrHigher('9'), |
| |
| /** |
| * Whether the {@code navigator.onLine} property is supported. |
| */ |
| HAS_NAVIGATOR_ONLINE_PROPERTY: !goog.userAgent.WEBKIT || |
| goog.userAgent.isVersionOrHigher('528'), |
| |
| /** |
| * Whether HTML5 network online/offline events are supported. |
| */ |
| HAS_HTML5_NETWORK_EVENT_SUPPORT: |
| goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9b') || |
| goog.userAgent.IE && goog.userAgent.isVersionOrHigher('8') || |
| goog.userAgent.OPERA && goog.userAgent.isVersionOrHigher('9.5') || |
| goog.userAgent.WEBKIT && goog.userAgent.isVersionOrHigher('528'), |
| |
| /** |
| * Whether HTML5 network events fire on document.body, or otherwise the |
| * window. |
| */ |
| HTML5_NETWORK_EVENTS_FIRE_ON_BODY: |
| goog.userAgent.GECKO && !goog.userAgent.isVersionOrHigher('8') || |
| goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('9'), |
| |
| /** |
| * Whether touch is enabled in the browser. |
| */ |
| TOUCH_ENABLED: |
| ('ontouchstart' in goog.global || |
| !!(goog.global['document'] && |
| document.documentElement && |
| 'ontouchstart' in document.documentElement) || |
| // IE10 uses non-standard touch events, so it has a different check. |
| !!(goog.global['navigator'] && |
| goog.global['navigator']['msMaxTouchPoints'])) |
| }; |