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+// 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']))
+};