diff options
author | Brian Picciano <mediocregopher@gmail.com> | 2021-01-21 17:22:53 -0700 |
---|---|---|
committer | Brian Picciano <mediocregopher@gmail.com> | 2021-01-21 17:22:53 -0700 |
commit | bcf9b230be6d74c71567fd0771b31d47d8dd39c7 (patch) | |
tree | 2d0fc16142d55bbd5876ac6b8174c2857883b40e /src/assets/viz/2/goog/events/browserfeature.js | |
parent | d57fd70640948cf20eeb41b56e8d4e23e616cec0 (diff) |
build the blog with nix
Diffstat (limited to 'src/assets/viz/2/goog/events/browserfeature.js')
-rw-r--r-- | src/assets/viz/2/goog/events/browserfeature.js | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/src/assets/viz/2/goog/events/browserfeature.js b/src/assets/viz/2/goog/events/browserfeature.js new file mode 100644 index 0000000..7cc7bd6 --- /dev/null +++ b/src/assets/viz/2/goog/events/browserfeature.js @@ -0,0 +1,122 @@ +// 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'); +goog.scope(function() { + + + +/** + * 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'])), + + /** + * Whether addEventListener supports {passive: true}. + * https://developers.google.com/web/updates/2016/06/passive-event-listeners + */ + PASSIVE_EVENTS: purify(function() { + // If we're in a web worker or other custom environment, we can't tell. + if (!goog.global.addEventListener || !Object.defineProperty) { // IE 8 + return false; + } + + var passive = false; + var options = Object.defineProperty({}, 'passive', { + get: function() { + passive = true; + } + }); + goog.global.addEventListener('test', goog.nullFunction, options); + goog.global.removeEventListener('test', goog.nullFunction, options); + + return passive; + }) +}; + + +/** + * Tricks Closure Compiler into believing that a function is pure. The compiler + * assumes that any `valueOf` function is pure, without analyzing its contents. + * + * @param {function(): T} fn + * @return {T} + * @template T + */ +function purify(fn) { + return ({valueOf: fn}).valueOf(); +} +}); // goog.scope |