remove unused browser_focus.js
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/* ***** BEGIN LICENSE BLOCK *****
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* Distributed under the BSD license:
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*
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* Copyright (c) 2010, Ajax.org B.V.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Ajax.org B.V. nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ***** END LICENSE BLOCK ***** */
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define(function(require, exports, module) {
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"use strict";
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var oop = require("./oop");
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var event = require("./event");
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var EventEmitter = require("./event_emitter").EventEmitter;
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/*
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* This class keeps track of the focus state of the given window.
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* Focus changes for example when the user switches a browser tab,
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* goes to the location bar or switches to another application.
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*/
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var BrowserFocus = function(win) {
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win = win || window;
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this.lastFocus = new Date().getTime();
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this._isFocused = true;
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var _self = this;
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// IE < 9 supports focusin and focusout events
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if ("onfocusin" in win.document) {
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event.addListener(win.document, "focusin", function(e) {
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_self._setFocused(true);
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});
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event.addListener(win.document, "focusout", function(e) {
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_self._setFocused(!!e.toElement);
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});
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}
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else {
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event.addListener(win, "blur", function(e) {
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_self._setFocused(false);
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});
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event.addListener(win, "focus", function(e) {
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_self._setFocused(true);
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});
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}
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};
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(function(){
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oop.implement(this, EventEmitter);
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this.isFocused = function() {
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return this._isFocused;
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};
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this._setFocused = function(isFocused) {
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if (this._isFocused == isFocused)
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return;
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if (isFocused)
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this.lastFocus = new Date().getTime();
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this._isFocused = isFocused;
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this._emit("changeFocus");
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};
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}).call(BrowserFocus.prototype);
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exports.BrowserFocus = BrowserFocus;
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});
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