source: trunk/workshop-routing-foss4g/web/ext/src/ext-core/src/core/Ext.js @ 76

/*!
 * Ext JS Library 3.4.0
 * Copyright(c) 2006-2011 Sencha Inc.
 * licensing@sencha.com
 * http://www.sencha.com/license
 */
// for old browsers
window.undefined = window.undefined;

/**
 * @class Ext
 * Ext core utilities and functions.
 * @singleton
 */

Ext = {
    /**
     * The version of the framework
     * @type String
     */
    version : '3.4.0',
    versionDetail : {
        major : 3,
        minor : 4,
        patch : 0
    }
};

/**
 * Copies all the properties of config to obj.
 * @param {Object} obj The receiver of the properties
 * @param {Object} config The source of the properties
 * @param {Object} defaults A different object that will also be applied for default values
 * @return {Object} returns obj
 * @member Ext apply
 */
Ext.apply = function(o, c, defaults){
    // no "this" reference for friendly out of scope calls
    if(defaults){
        Ext.apply(o, defaults);
    }
    if(o && c && typeof c == 'object'){
        for(var p in c){
            o[p] = c[p];
        }
    }
    return o;
};

(function(){
    var idSeed = 0,
        toString = Object.prototype.toString,
        ua = navigator.userAgent.toLowerCase(),
        check = function(r){
            return r.test(ua);
        },
        DOC = document,
        docMode = DOC.documentMode,
        isStrict = DOC.compatMode == "CSS1Compat",
        isOpera = check(/opera/),
        isChrome = check(/\bchrome\b/),
        isWebKit = check(/webkit/),
        isSafari = !isChrome && check(/safari/),
        isSafari2 = isSafari && check(/applewebkit\/4/), // unique to Safari 2
        isSafari3 = isSafari && check(/version\/3/),
        isSafari4 = isSafari && check(/version\/4/),
        isIE = !isOpera && check(/msie/),
        isIE7 = isIE && (check(/msie 7/) || docMode == 7),
        isIE8 = isIE && (check(/msie 8/) && docMode != 7),
        isIE9 = isIE && check(/msie 9/),
        isIE6 = isIE && !isIE7 && !isIE8 && !isIE9,
        isGecko = !isWebKit && check(/gecko/),
        isGecko2 = isGecko && check(/rv:1\.8/),
        isGecko3 = isGecko && check(/rv:1\.9/),
        isBorderBox = isIE && !isStrict,
        isWindows = check(/windows|win32/),
        isMac = check(/macintosh|mac os x/),
        isAir = check(/adobeair/),
        isLinux = check(/linux/),
        isSecure = /^https/i.test(window.location.protocol);

    // remove css image flicker
    if(isIE6){
        try{
            DOC.execCommand("BackgroundImageCache", false, true);
        }catch(e){}
    }

    Ext.apply(Ext, {
        /**
         * URL to a blank file used by Ext when in secure mode for iframe src and onReady src to prevent
         * the IE insecure content warning (<tt>'about:blank'</tt>, except for IE in secure mode, which is <tt>'javascript:""'</tt>).
         * @type String
         */
        SSL_SECURE_URL : isSecure && isIE ? 'javascript:""' : 'about:blank',
        /**
         * True if the browser is in strict (standards-compliant) mode, as opposed to quirks mode
         * @type Boolean
         */
        isStrict : isStrict,
        /**
         * True if the page is running over SSL
         * @type Boolean
         */
        isSecure : isSecure,
        /**
         * True when the document is fully initialized and ready for action
         * @type Boolean
         */
        isReady : false,

        /**
         * True if the {@link Ext.Fx} Class is available
         * @type Boolean
         * @property enableFx
         */

        /**
         * HIGHLY EXPERIMENTAL
         * True to force css based border-box model override and turning off javascript based adjustments. This is a
         * runtime configuration and must be set before onReady.
         * @type Boolean
         */
        enableForcedBoxModel : false,

        /**
         * True to automatically uncache orphaned Ext.Elements periodically (defaults to true)
         * @type Boolean
         */
        enableGarbageCollector : true,

        /**
         * True to automatically purge event listeners during garbageCollection (defaults to false).
         * @type Boolean
         */
        enableListenerCollection : false,

        /**
         * EXPERIMENTAL - True to cascade listener removal to child elements when an element is removed.
         * Currently not optimized for performance.
         * @type Boolean
         */
        enableNestedListenerRemoval : false,

        /**
         * Indicates whether to use native browser parsing for JSON methods.
         * This option is ignored if the browser does not support native JSON methods.
         * <b>Note: Native JSON methods will not work with objects that have functions.
         * Also, property names must be quoted, otherwise the data will not parse.</b> (Defaults to false)
         * @type Boolean
         */
        USE_NATIVE_JSON : false,

        /**
         * Copies all the properties of config to obj if they don't already exist.
         * @param {Object} obj The receiver of the properties
         * @param {Object} config The source of the properties
         * @return {Object} returns obj
         */
        applyIf : function(o, c){
            if(o){
                for(var p in c){
                    if(!Ext.isDefined(o[p])){
                        o[p] = c[p];
                    }
                }
            }
            return o;
        },

        /**
         * Generates unique ids. If the element already has an id, it is unchanged
         * @param {Mixed} el (optional) The element to generate an id for
         * @param {String} prefix (optional) Id prefix (defaults "ext-gen")
         * @return {String} The generated Id.
         */
        id : function(el, prefix){
            el = Ext.getDom(el, true) || {};
            if (!el.id) {
                el.id = (prefix || "ext-gen") + (++idSeed);
            }
            return el.id;
        },

        /**
         * <p>Extends one class to create a subclass and optionally overrides members with the passed literal. This method
         * also adds the function "override()" to the subclass that can be used to override members of the class.</p>
         * For example, to create a subclass of Ext GridPanel:
         * <pre><code>
MyGridPanel = Ext.extend(Ext.grid.GridPanel, {
    constructor: function(config) {

//      Create configuration for this Grid.
        var store = new Ext.data.Store({...});
        var colModel = new Ext.grid.ColumnModel({...});

//      Create a new config object containing our computed properties
//      *plus* whatever was in the config parameter.
        config = Ext.apply({
            store: store,
            colModel: colModel
        }, config);

        MyGridPanel.superclass.constructor.call(this, config);

//      Your postprocessing here
    },

    yourMethod: function() {
        // etc.
    }
});
</code></pre>
         *
         * <p>This function also supports a 3-argument call in which the subclass's constructor is
         * passed as an argument. In this form, the parameters are as follows:</p>
         * <div class="mdetail-params"><ul>
         * <li><code>subclass</code> : Function <div class="sub-desc">The subclass constructor.</div></li>
         * <li><code>superclass</code> : Function <div class="sub-desc">The constructor of class being extended</div></li>
         * <li><code>overrides</code> : Object <div class="sub-desc">A literal with members which are copied into the subclass's
         * prototype, and are therefore shared among all instances of the new class.</div></li>
         * </ul></div>
         *
         * @param {Function} superclass The constructor of class being extended.
         * @param {Object} overrides <p>A literal with members which are copied into the subclass's
         * prototype, and are therefore shared between all instances of the new class.</p>
         * <p>This may contain a special member named <tt><b>constructor</b></tt>. This is used
         * to define the constructor of the new class, and is returned. If this property is
         * <i>not</i> specified, a constructor is generated and returned which just calls the
         * superclass's constructor passing on its parameters.</p>
         * <p><b>It is essential that you call the superclass constructor in any provided constructor. See example code.</b></p>
         * @return {Function} The subclass constructor from the <code>overrides</code> parameter, or a generated one if not provided.
         */
        extend : function(){
            // inline overrides
            var io = function(o){
                for(var m in o){
                    this[m] = o[m];
                }
            };
            var oc = Object.prototype.constructor;

            return function(sb, sp, overrides){
                if(typeof sp == 'object'){
                    overrides = sp;
                    sp = sb;
                    sb = overrides.constructor != oc ? overrides.constructor : function(){sp.apply(this, arguments);};
                }
                var F = function(){},
                    sbp,
                    spp = sp.prototype;

                F.prototype = spp;
                sbp = sb.prototype = new F();
                sbp.constructor=sb;
                sb.superclass=spp;
                if(spp.constructor == oc){
                    spp.constructor=sp;
                }
                sb.override = function(o){
                    Ext.override(sb, o);
                };
                sbp.superclass = sbp.supr = (function(){
                    return spp;
                });
                sbp.override = io;
                Ext.override(sb, overrides);
                sb.extend = function(o){return Ext.extend(sb, o);};
                return sb;
            };
        }(),

        /**
         * Adds a list of functions to the prototype of an existing class, overwriting any existing methods with the same name.
         * Usage:<pre><code>
Ext.override(MyClass, {
    newMethod1: function(){
        // etc.
    },
    newMethod2: function(foo){
        // etc.
    }
});
</code></pre>
         * @param {Object} origclass The class to override
         * @param {Object} overrides The list of functions to add to origClass.  This should be specified as an object literal
         * containing one or more methods.
         * @method override
         */
        override : function(origclass, overrides){
            if(overrides){
                var p = origclass.prototype;
                Ext.apply(p, overrides);
                if(Ext.isIE && overrides.hasOwnProperty('toString')){
                    p.toString = overrides.toString;
                }
            }
        },

        /**
         * Creates namespaces to be used for scoping variables and classes so that they are not global.
         * Specifying the last node of a namespace implicitly creates all other nodes. Usage:
         * <pre><code>
Ext.namespace('Company', 'Company.data');
Ext.namespace('Company.data'); // equivalent and preferable to above syntax
Company.Widget = function() { ... }
Company.data.CustomStore = function(config) { ... }
</code></pre>
         * @param {String} namespace1
         * @param {String} namespace2
         * @param {String} etc
         * @return {Object} The namespace object. (If multiple arguments are passed, this will be the last namespace created)
         * @method namespace
         */
        namespace : function(){
            var len1 = arguments.length,
                i = 0,
                len2,
                j,
                main,
                ns,
                sub,
                current;
                
            for(; i < len1; ++i) {
                main = arguments[i];
                ns = arguments[i].split('.');
                current = window[ns[0]];
                if (current === undefined) {
                    current = window[ns[0]] = {};
                }
                sub = ns.slice(1);
                len2 = sub.length;
                for(j = 0; j < len2; ++j) {
                    current = current[sub[j]] = current[sub[j]] || {};
                }
            }
            return current;
        },

        /**
         * Takes an object and converts it to an encoded URL. e.g. Ext.urlEncode({foo: 1, bar: 2}); would return "foo=1&bar=2".  Optionally, property values can be arrays, instead of keys and the resulting string that's returned will contain a name/value pair for each array value.
         * @param {Object} o
         * @param {String} pre (optional) A prefix to add to the url encoded string
         * @return {String}
         */
        urlEncode : function(o, pre){
            var empty,
                buf = [],
                e = encodeURIComponent;

            Ext.iterate(o, function(key, item){
                empty = Ext.isEmpty(item);
                Ext.each(empty ? key : item, function(val){
                    buf.push('&', e(key), '=', (!Ext.isEmpty(val) && (val != key || !empty)) ? (Ext.isDate(val) ? Ext.encode(val).replace(/"/g, '') : e(val)) : '');
                });
            });
            if(!pre){
                buf.shift();
                pre = '';
            }
            return pre + buf.join('');
        },

        /**
         * Takes an encoded URL and and converts it to an object. Example: <pre><code>
Ext.urlDecode("foo=1&bar=2"); // returns {foo: "1", bar: "2"}
Ext.urlDecode("foo=1&bar=2&bar=3&bar=4", false); // returns {foo: "1", bar: ["2", "3", "4"]}
</code></pre>
         * @param {String} string
         * @param {Boolean} overwrite (optional) Items of the same name will overwrite previous values instead of creating an an array (Defaults to false).
         * @return {Object} A literal with members
         */
        urlDecode : function(string, overwrite){
            if(Ext.isEmpty(string)){
                return {};
            }
            var obj = {},
                pairs = string.split('&'),
                d = decodeURIComponent,
                name,
                value;
            Ext.each(pairs, function(pair) {
                pair = pair.split('=');
                name = d(pair[0]);
                value = d(pair[1]);
                obj[name] = overwrite || !obj[name] ? value :
                            [].concat(obj[name]).concat(value);
            });
            return obj;
        },

        /**
         * Appends content to the query string of a URL, handling logic for whether to place
         * a question mark or ampersand.
         * @param {String} url The URL to append to.
         * @param {String} s The content to append to the URL.
         * @return (String) The resulting URL
         */
        urlAppend : function(url, s){
            if(!Ext.isEmpty(s)){
                return url + (url.indexOf('?') === -1 ? '?' : '&') + s;
            }
            return url;
        },

        /**
         * Converts any iterable (numeric indices and a length property) into a true array
         * Don't use this on strings. IE doesn't support "abc"[0] which this implementation depends on.
         * For strings, use this instead: "abc".match(/./g) => [a,b,c];
         * @param {Iterable} the iterable object to be turned into a true Array.
         * @return (Array) array
         */
         toArray : function(){
             return isIE ?
                 function(a, i, j, res){
                     res = [];
                     for(var x = 0, len = a.length; x < len; x++) {
                         res.push(a[x]);
                     }
                     return res.slice(i || 0, j || res.length);
                 } :
                 function(a, i, j){
                     return Array.prototype.slice.call(a, i || 0, j || a.length);
                 };
         }(),

        isIterable : function(v){
            //check for array or arguments
            if(Ext.isArray(v) || v.callee){
                return true;
            }
            //check for node list type
            if(/NodeList|HTMLCollection/.test(toString.call(v))){
                return true;
            }
            //NodeList has an item and length property
            //IXMLDOMNodeList has nextNode method, needs to be checked first.
            return ((typeof v.nextNode != 'undefined' || v.item) && Ext.isNumber(v.length));
        },

        /**
         * Iterates an array calling the supplied function.
         * @param {Array/NodeList/Mixed} array The array to be iterated. If this
         * argument is not really an array, the supplied function is called once.
         * @param {Function} fn The function to be called with each item. If the
         * supplied function returns false, iteration stops and this method returns
         * the current <code>index</code>. This function is called with
         * the following arguments:
         * <div class="mdetail-params"><ul>
         * <li><code>item</code> : <i>Mixed</i>
         * <div class="sub-desc">The item at the current <code>index</code>
         * in the passed <code>array</code></div></li>
         * <li><code>index</code> : <i>Number</i>
         * <div class="sub-desc">The current index within the array</div></li>
         * <li><code>allItems</code> : <i>Array</i>
         * <div class="sub-desc">The <code>array</code> passed as the first
         * argument to <code>Ext.each</code>.</div></li>
         * </ul></div>
         * @param {Object} scope The scope (<code>this</code> reference) in which the specified function is executed.
         * Defaults to the <code>item</code> at the current <code>index</code>
         * within the passed <code>array</code>.
         * @return See description for the fn parameter.
         */
        each : function(array, fn, scope){
            if(Ext.isEmpty(array, true)){
                return;
            }
            if(!Ext.isIterable(array) || Ext.isPrimitive(array)){
                array = [array];
            }
            for(var i = 0, len = array.length; i < len; i++){
                if(fn.call(scope || array[i], array[i], i, array) === false){
                    return i;
                };
            }
        },

        /**
         * Iterates either the elements in an array, or each of the properties in an object.
         * <b>Note</b>: If you are only iterating arrays, it is better to call {@link #each}.
         * @param {Object/Array} object The object or array to be iterated
         * @param {Function} fn The function to be called for each iteration.
         * The iteration will stop if the supplied function returns false, or
         * all array elements / object properties have been covered. The signature
         * varies depending on the type of object being interated:
         * <div class="mdetail-params"><ul>
         * <li>Arrays : <tt>(Object item, Number index, Array allItems)</tt>
         * <div class="sub-desc">
         * When iterating an array, the supplied function is called with each item.</div></li>
         * <li>Objects : <tt>(String key, Object value, Object)</tt>
         * <div class="sub-desc">
         * When iterating an object, the supplied function is called with each key-value pair in
         * the object, and the iterated object</div></li>
         * </ul></div>
         * @param {Object} scope The scope (<code>this</code> reference) in which the specified function is executed. Defaults to
         * the <code>object</code> being iterated.
         */
        iterate : function(obj, fn, scope){
            if(Ext.isEmpty(obj)){
                return;
            }
            if(Ext.isIterable(obj)){
                Ext.each(obj, fn, scope);
                return;
            }else if(typeof obj == 'object'){
                for(var prop in obj){
                    if(obj.hasOwnProperty(prop)){
                        if(fn.call(scope || obj, prop, obj[prop], obj) === false){
                            return;
                        };
                    }
                }
            }
        },

        /**
         * Return the dom node for the passed String (id), dom node, or Ext.Element.
         * Optional 'strict' flag is needed for IE since it can return 'name' and
         * 'id' elements by using getElementById.
         * Here are some examples:
         * <pre><code>
// gets dom node based on id
var elDom = Ext.getDom('elId');
// gets dom node based on the dom node
var elDom1 = Ext.getDom(elDom);

// If we don&#39;t know if we are working with an
// Ext.Element or a dom node use Ext.getDom
function(el){
    var dom = Ext.getDom(el);
    // do something with the dom node
}
         * </code></pre>
         * <b>Note</b>: the dom node to be found actually needs to exist (be rendered, etc)
         * when this method is called to be successful.
         * @param {Mixed} el
         * @return HTMLElement
         */
        getDom : function(el, strict){
            if(!el || !DOC){
                return null;
            }
            if (el.dom){
                return el.dom;
            } else {
                if (typeof el == 'string') {
                    var e = DOC.getElementById(el);
                    // IE returns elements with the 'name' and 'id' attribute.
                    // we do a strict check to return the element with only the id attribute
                    if (e && isIE && strict) {
                        if (el == e.getAttribute('id')) {
                            return e;
                        } else {
                            return null;
                        }
                    }
                    return e;
                } else {
                    return el;
                }
            }
        },

        /**
         * Returns the current document body as an {@link Ext.Element}.
         * @return Ext.Element The document body
         */
        getBody : function(){
            return Ext.get(DOC.body || DOC.documentElement);
        },
        
        /**
         * Returns the current document body as an {@link Ext.Element}.
         * @return Ext.Element The document body
         */
        getHead : function() {
            var head;
            
            return function() {
                if (head == undefined) {
                    head = Ext.get(DOC.getElementsByTagName("head")[0]);
                }
                
                return head;
            };
        }(),

        /**
         * Removes a DOM node from the document.
         */
        /**
         * <p>Removes this element from the document, removes all DOM event listeners, and deletes the cache reference.
         * All DOM event listeners are removed from this element. If {@link Ext#enableNestedListenerRemoval} is
         * <code>true</code>, then DOM event listeners are also removed from all child nodes. The body node
         * will be ignored if passed in.</p>
         * @param {HTMLElement} node The node to remove
         */
        removeNode : isIE && !isIE8 ? function(){
            var d;
            return function(n){
                if(n && n.tagName != 'BODY'){
                    (Ext.enableNestedListenerRemoval) ? Ext.EventManager.purgeElement(n, true) : Ext.EventManager.removeAll(n);
                    d = d || DOC.createElement('div');
                    d.appendChild(n);
                    d.innerHTML = '';
                    delete Ext.elCache[n.id];
                }
            };
        }() : function(n){
            if(n && n.parentNode && n.tagName != 'BODY'){
                (Ext.enableNestedListenerRemoval) ? Ext.EventManager.purgeElement(n, true) : Ext.EventManager.removeAll(n);
                n.parentNode.removeChild(n);
                delete Ext.elCache[n.id];
            }
        },

        /**
         * <p>Returns true if the passed value is empty.</p>
         * <p>The value is deemed to be empty if it is<div class="mdetail-params"><ul>
         * <li>null</li>
         * <li>undefined</li>
         * <li>an empty array</li>
         * <li>a zero length string (Unless the <tt>allowBlank</tt> parameter is <tt>true</tt>)</li>
         * </ul></div>
         * @param {Mixed} value The value to test
         * @param {Boolean} allowBlank (optional) true to allow empty strings (defaults to false)
         * @return {Boolean}
         */
        isEmpty : function(v, allowBlank){
            return v === null || v === undefined || ((Ext.isArray(v) && !v.length)) || (!allowBlank ? v === '' : false);
        },

        /**
         * Returns true if the passed value is a JavaScript array, otherwise false.
         * @param {Mixed} value The value to test
         * @return {Boolean}
         */
        isArray : function(v){
            return toString.apply(v) === '[object Array]';
        },

        /**
         * Returns true if the passed object is a JavaScript date object, otherwise false.
         * @param {Object} object The object to test
         * @return {Boolean}
         */
        isDate : function(v){
            return toString.apply(v) === '[object Date]';
        },

        /**
         * Returns true if the passed value is a JavaScript Object, otherwise false.
         * @param {Mixed} value The value to test
         * @return {Boolean}
         */
        isObject : function(v){
            return !!v && Object.prototype.toString.call(v) === '[object Object]';
        },

        /**
         * Returns true if the passed value is a JavaScript 'primitive', a string, number or boolean.
         * @param {Mixed} value The value to test
         * @return {Boolean}
         */
        isPrimitive : function(v){
            return Ext.isString(v) || Ext.isNumber(v) || Ext.isBoolean(v);
        },

        /**
         * Returns true if the passed value is a JavaScript Function, otherwise false.
         * @param {Mixed} value The value to test
         * @return {Boolean}
         */
        isFunction : function(v){
            return toString.apply(v) === '[object Function]';
        },

        /**
         * Returns true if the passed value is a number. Returns false for non-finite numbers.
         * @param {Mixed} value The value to test
         * @return {Boolean}
         */
        isNumber : function(v){
            return typeof v === 'number' && isFinite(v);
        },

        /**
         * Returns true if the passed value is a string.
         * @param {Mixed} value The value to test
         * @return {Boolean}
         */
        isString : function(v){
            return typeof v === 'string';
        },

        /**
         * Returns true if the passed value is a boolean.
         * @param {Mixed} value The value to test
         * @return {Boolean}
         */
        isBoolean : function(v){
            return typeof v === 'boolean';
        },

        /**
         * Returns true if the passed value is an HTMLElement
         * @param {Mixed} value The value to test
         * @return {Boolean}
         */
        isElement : function(v) {
            return v ? !!v.tagName : false;
        },

        /**
         * Returns true if the passed value is not undefined.
         * @param {Mixed} value The value to test
         * @return {Boolean}
         */
        isDefined : function(v){
            return typeof v !== 'undefined';
        },

        /**
         * True if the detected browser is Opera.
         * @type Boolean
         */
        isOpera : isOpera,
        /**
         * True if the detected browser uses WebKit.
         * @type Boolean
         */
        isWebKit : isWebKit,
        /**
         * True if the detected browser is Chrome.
         * @type Boolean
         */
        isChrome : isChrome,
        /**
         * True if the detected browser is Safari.
         * @type Boolean
         */
        isSafari : isSafari,
        /**
         * True if the detected browser is Safari 3.x.
         * @type Boolean
         */
        isSafari3 : isSafari3,
        /**
         * True if the detected browser is Safari 4.x.
         * @type Boolean
         */
        isSafari4 : isSafari4,
        /**
         * True if the detected browser is Safari 2.x.
         * @type Boolean
         */
        isSafari2 : isSafari2,
        /**
         * True if the detected browser is Internet Explorer.
         * @type Boolean
         */
        isIE : isIE,
        /**
         * True if the detected browser is Internet Explorer 6.x.
         * @type Boolean
         */
        isIE6 : isIE6,
        /**
         * True if the detected browser is Internet Explorer 7.x.
         * @type Boolean
         */
        isIE7 : isIE7,
        /**
         * True if the detected browser is Internet Explorer 8.x.
         * @type Boolean
         */
        isIE8 : isIE8,
        /**
         * True if the detected browser is Internet Explorer 9.x.
         * @type Boolean
         */
        isIE9 : isIE9,
        /**
         * True if the detected browser uses the Gecko layout engine (e.g. Mozilla, Firefox).
         * @type Boolean
         */
        isGecko : isGecko,
        /**
         * True if the detected browser uses a pre-Gecko 1.9 layout engine (e.g. Firefox 2.x).
         * @type Boolean
         */
        isGecko2 : isGecko2,
        /**
         * True if the detected browser uses a Gecko 1.9+ layout engine (e.g. Firefox 3.x).
         * @type Boolean
         */
        isGecko3 : isGecko3,
        /**
         * True if the detected browser is Internet Explorer running in non-strict mode.
         * @type Boolean
         */
        isBorderBox : isBorderBox,
        /**
         * True if the detected platform is Linux.
         * @type Boolean
         */
        isLinux : isLinux,
        /**
         * True if the detected platform is Windows.
         * @type Boolean
         */
        isWindows : isWindows,
        /**
         * True if the detected platform is Mac OS.
         * @type Boolean
         */
        isMac : isMac,
        /**
         * True if the detected platform is Adobe Air.
         * @type Boolean
         */
        isAir : isAir
    });

    /**
     * Creates namespaces to be used for scoping variables and classes so that they are not global.
     * Specifying the last node of a namespace implicitly creates all other nodes. Usage:
     * <pre><code>
Ext.namespace('Company', 'Company.data');
Ext.namespace('Company.data'); // equivalent and preferable to above syntax
Company.Widget = function() { ... }
Company.data.CustomStore = function(config) { ... }
</code></pre>
     * @param {String} namespace1
     * @param {String} namespace2
     * @param {String} etc
     * @return {Object} The namespace object. (If multiple arguments are passed, this will be the last namespace created)
     * @method ns
     */
    Ext.ns = Ext.namespace;
})();

Ext.ns('Ext.util', 'Ext.lib', 'Ext.data', 'Ext.supports');

Ext.elCache = {};

/**
 * @class Function
 * These functions are available on every Function object (any JavaScript function).
 */
Ext.apply(Function.prototype, {
     /**
     * Creates an interceptor function. The passed function is called before the original one. If it returns false,
     * the original one is not called. The resulting function returns the results of the original function.
     * The passed function is called with the parameters of the original function. Example usage:
     * <pre><code>
var sayHi = function(name){
    alert('Hi, ' + name);
}

sayHi('Fred'); // alerts "Hi, Fred"

// create a new function that validates input without
// directly modifying the original function:
var sayHiToFriend = sayHi.createInterceptor(function(name){
    return name == 'Brian';
});

sayHiToFriend('Fred');  // no alert
sayHiToFriend('Brian'); // alerts "Hi, Brian"
</code></pre>
     * @param {Function} fcn The function to call before the original
     * @param {Object} scope (optional) The scope (<code><b>this</b></code> reference) in which the passed function is executed.
     * <b>If omitted, defaults to the scope in which the original function is called or the browser window.</b>
     * @return {Function} The new function
     */
    createInterceptor : function(fcn, scope){
        var method = this;
        return !Ext.isFunction(fcn) ?
                this :
                function() {
                    var me = this,
                        args = arguments;
                    fcn.target = me;
                    fcn.method = method;
                    return (fcn.apply(scope || me || window, args) !== false) ?
                            method.apply(me || window, args) :
                            null;
                };
    },

     /**
     * Creates a callback that passes arguments[0], arguments[1], arguments[2], ...
     * Call directly on any function. Example: <code>myFunction.createCallback(arg1, arg2)</code>
     * Will create a function that is bound to those 2 args. <b>If a specific scope is required in the
     * callback, use {@link #createDelegate} instead.</b> The function returned by createCallback always
     * executes in the window scope.
     * <p>This method is required when you want to pass arguments to a callback function.  If no arguments
     * are needed, you can simply pass a reference to the function as a callback (e.g., callback: myFn).
     * However, if you tried to pass a function with arguments (e.g., callback: myFn(arg1, arg2)) the function
     * would simply execute immediately when the code is parsed. Example usage:
     * <pre><code>
var sayHi = function(name){
    alert('Hi, ' + name);
}

// clicking the button alerts "Hi, Fred"
new Ext.Button({
    text: 'Say Hi',
    renderTo: Ext.getBody(),
    handler: sayHi.createCallback('Fred')
});
</code></pre>
     * @return {Function} The new function
    */
    createCallback : function(/*args...*/){
        // make args available, in function below
        var args = arguments,
            method = this;
        return function() {
            return method.apply(window, args);
        };
    },

    /**
     * Creates a delegate (callback) that sets the scope to obj.
     * Call directly on any function. Example: <code>this.myFunction.createDelegate(this, [arg1, arg2])</code>
     * Will create a function that is automatically scoped to obj so that the <tt>this</tt> variable inside the
     * callback points to obj. Example usage:
     * <pre><code>
var sayHi = function(name){
    // Note this use of "this.text" here.  This function expects to
    // execute within a scope that contains a text property.  In this
    // example, the "this" variable is pointing to the btn object that
    // was passed in createDelegate below.
    alert('Hi, ' + name + '. You clicked the "' + this.text + '" button.');
}

var btn = new Ext.Button({
    text: 'Say Hi',
    renderTo: Ext.getBody()
});

// This callback will execute in the scope of the
// button instance. Clicking the button alerts
// "Hi, Fred. You clicked the "Say Hi" button."
btn.on('click', sayHi.createDelegate(btn, ['Fred']));
</code></pre>
     * @param {Object} scope (optional) The scope (<code><b>this</b></code> reference) in which the function is executed.
     * <b>If omitted, defaults to the browser window.</b>
     * @param {Array} args (optional) Overrides arguments for the call. (Defaults to the arguments passed by the caller)
     * @param {Boolean/Number} appendArgs (optional) if True args are appended to call args instead of overriding,
     * if a number the args are inserted at the specified position
     * @return {Function} The new function
     */
    createDelegate : function(obj, args, appendArgs){
        var method = this;
        return function() {
            var callArgs = args || arguments;
            if (appendArgs === true){
                callArgs = Array.prototype.slice.call(arguments, 0);
                callArgs = callArgs.concat(args);
            }else if (Ext.isNumber(appendArgs)){
                callArgs = Array.prototype.slice.call(arguments, 0); // copy arguments first
                var applyArgs = [appendArgs, 0].concat(args); // create method call params
                Array.prototype.splice.apply(callArgs, applyArgs); // splice them in
            }
            return method.apply(obj || window, callArgs);
        };
    },

    /**
     * Calls this function after the number of millseconds specified, optionally in a specific scope. Example usage:
     * <pre><code>
var sayHi = function(name){
    alert('Hi, ' + name);
}

// executes immediately:
sayHi('Fred');

// executes after 2 seconds:
sayHi.defer(2000, this, ['Fred']);

// this syntax is sometimes useful for deferring
// execution of an anonymous function:
(function(){
    alert('Anonymous');
}).defer(100);
</code></pre>
     * @param {Number} millis The number of milliseconds for the setTimeout call (if less than or equal to 0 the function is executed immediately)
     * @param {Object} scope (optional) The scope (<code><b>this</b></code> reference) in which the function is executed.
     * <b>If omitted, defaults to the browser window.</b>
     * @param {Array} args (optional) Overrides arguments for the call. (Defaults to the arguments passed by the caller)
     * @param {Boolean/Number} appendArgs (optional) if True args are appended to call args instead of overriding,
     * if a number the args are inserted at the specified position
     * @return {Number} The timeout id that can be used with clearTimeout
     */
    defer : function(millis, obj, args, appendArgs){
        var fn = this.createDelegate(obj, args, appendArgs);
        if(millis > 0){
            return setTimeout(fn, millis);
        }
        fn();
        return 0;
    }
});

/**
 * @class String
 * These functions are available on every String object.
 */
Ext.applyIf(String, {
    /**
     * Allows you to define a tokenized string and pass an arbitrary number of arguments to replace the tokens.  Each
     * token must be unique, and must increment in the format {0}, {1}, etc.  Example usage:
     * <pre><code>
var cls = 'my-class', text = 'Some text';
var s = String.format('&lt;div class="{0}">{1}&lt;/div>', cls, text);
// s now contains the string: '&lt;div class="my-class">Some text&lt;/div>'
     * </code></pre>
     * @param {String} string The tokenized string to be formatted
     * @param {String} value1 The value to replace token {0}
     * @param {String} value2 Etc...
     * @return {String} The formatted string
     * @static
     */
    format : function(format){
        var args = Ext.toArray(arguments, 1);
        return format.replace(/\{(\d+)\}/g, function(m, i){
            return args[i];
        });
    }
});

/**
 * @class Array
 */
Ext.applyIf(Array.prototype, {
    /**
     * Checks whether or not the specified object exists in the array.
     * @param {Object} o The object to check for
     * @param {Number} from (Optional) The index at which to begin the search
     * @return {Number} The index of o in the array (or -1 if it is not found)
     */
    indexOf : function(o, from){
        var len = this.length;
        from = from || 0;
        from += (from < 0) ? len : 0;
        for (; from < len; ++from){
            if(this[from] === o){
                return from;
            }
        }
        return -1;
    },

    /**
     * Removes the specified object from the array.  If the object is not found nothing happens.
     * @param {Object} o The object to remove
     * @return {Array} this array
     */
    remove : function(o){
        var index = this.indexOf(o);
        if(index != -1){
            this.splice(index, 1);
        }
        return this;
    }
});