1 | // Copyright 2010 The Closure Library Authors. All Rights Reserved. |
2 | // |
3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
4 | // you may not use this file except in compliance with the License. |
5 | // You may obtain a copy of the License at |
6 | // |
7 | // http://www.apache.org/licenses/LICENSE-2.0 |
8 | // |
9 | // Unless required by applicable law or agreed to in writing, software |
10 | // distributed under the License is distributed on an "AS-IS" BASIS, |
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
12 | // See the License for the specific language governing permissions and |
13 | // limitations under the License. |
14 | |
15 | /** |
16 | * @fileoverview Browser capability checks for the events package. |
17 | * |
18 | */ |
19 | |
20 | |
21 | goog.provide('goog.events.BrowserFeature'); |
22 | |
23 | goog.require('goog.userAgent'); |
24 | |
25 | |
26 | /** |
27 | * Enum of browser capabilities. |
28 | * @enum {boolean} |
29 | */ |
30 | goog.events.BrowserFeature = { |
31 | /** |
32 | * Whether the button attribute of the event is W3C compliant. False in |
33 | * Internet Explorer prior to version 9; document-version dependent. |
34 | */ |
35 | HAS_W3C_BUTTON: !goog.userAgent.IE || |
36 | goog.userAgent.isDocumentModeOrHigher(9), |
37 | |
38 | /** |
39 | * Whether the browser supports full W3C event model. |
40 | */ |
41 | HAS_W3C_EVENT_SUPPORT: !goog.userAgent.IE || |
42 | goog.userAgent.isDocumentModeOrHigher(9), |
43 | |
44 | /** |
45 | * To prevent default in IE7-8 for certain keydown events we need set the |
46 | * keyCode to -1. |
47 | */ |
48 | SET_KEY_CODE_TO_PREVENT_DEFAULT: goog.userAgent.IE && |
49 | !goog.userAgent.isVersionOrHigher('9'), |
50 | |
51 | /** |
52 | * Whether the {@code navigator.onLine} property is supported. |
53 | */ |
54 | HAS_NAVIGATOR_ONLINE_PROPERTY: !goog.userAgent.WEBKIT || |
55 | goog.userAgent.isVersionOrHigher('528'), |
56 | |
57 | /** |
58 | * Whether HTML5 network online/offline events are supported. |
59 | */ |
60 | HAS_HTML5_NETWORK_EVENT_SUPPORT: |
61 | goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9b') || |
62 | goog.userAgent.IE && goog.userAgent.isVersionOrHigher('8') || |
63 | goog.userAgent.OPERA && goog.userAgent.isVersionOrHigher('9.5') || |
64 | goog.userAgent.WEBKIT && goog.userAgent.isVersionOrHigher('528'), |
65 | |
66 | /** |
67 | * Whether HTML5 network events fire on document.body, or otherwise the |
68 | * window. |
69 | */ |
70 | HTML5_NETWORK_EVENTS_FIRE_ON_BODY: |
71 | goog.userAgent.GECKO && !goog.userAgent.isVersionOrHigher('8') || |
72 | goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('9'), |
73 | |
74 | /** |
75 | * Whether touch is enabled in the browser. |
76 | */ |
77 | TOUCH_ENABLED: |
78 | ('ontouchstart' in goog.global || |
79 | !!(goog.global['document'] && |
80 | document.documentElement && |
81 | 'ontouchstart' in document.documentElement) || |
82 | // IE10 uses non-standard touch events, so it has a different check. |
83 | !!(goog.global['navigator'] && |
84 | goog.global['navigator']['msMaxTouchPoints'])) |
85 | }; |