/**
 * @class Ext.dom.Element
 * @alternateClassName Ext.Element
 * @alternateClassName Ext.core.Element
 * @extend Ext.dom.AbstractElement
 *
 * Encapsulates a DOM element, adding simple DOM manipulation facilities, normalizing for browser differences.
 *
 * All instances of this class inherit the methods of {@link Ext.fx.Anim} making visual effects easily available to all
 * DOM elements.
 *
 * Note that the events documented in this class are not Ext events, they encapsulate browser events. Some older browsers
 * may not support the full range of events. Which events are supported is beyond the control of Ext JS.
 *
 * Usage:
 *
 *     // by id
 *     var el = Ext.get("my-div");
 *
 *     // by DOM element reference
 *     var el = Ext.get(myDivElement);
 *
 * # Animations
 *
 * When an element is manipulated, by default there is no animation.
 *
 *     var el = Ext.get("my-div");
 *
 *     // no animation
 *     el.setWidth(100);
 *
 * Many of the functions for manipulating an element have an optional "animate" parameter. This parameter can be
 * specified as boolean (true) for default animation effects.
 *
 *     // default animation
 *     el.setWidth(100, true);
 *
 * To configure the effects, an object literal with animation options to use as the Element animation configuration
 * object can also be specified. Note that the supported Element animation configuration options are a subset of the
 * {@link Ext.fx.Anim} animation options specific to Fx effects. The supported Element animation configuration options
 * are:
 *
 *     Option    Default   Description
 *     --------- --------  ---------------------------------------------
 *     {@link Ext.fx.Anim#duration duration}  350       The duration of the animation in milliseconds
 *     {@link Ext.fx.Anim#easing easing}    easeOut   The easing method
 *     {@link Ext.fx.Anim#callback callback}  none      A function to execute when the anim completes
 *     {@link Ext.fx.Anim#scope scope}     this      The scope (this) of the callback function
 *
 * Usage:
 *
 *     // Element animation options object
 *     var opt = {
 *         {@link Ext.fx.Anim#duration duration}: 1000,
 *         {@link Ext.fx.Anim#easing easing}: 'elasticIn',
 *         {@link Ext.fx.Anim#callback callback}: this.foo,
 *         {@link Ext.fx.Anim#scope scope}: this
 *     };
 *     // animation with some options set
 *     el.setWidth(100, opt);
 *
 * The Element animation object being used for the animation will be set on the options object as "anim", which allows
 * you to stop or manipulate the animation. Here is an example:
 *
 *     // using the "anim" property to get the Anim object
 *     if(opt.anim.isAnimated()){
 *         opt.anim.stop();
 *     }
 *
 * # Composite (Collections of) Elements
 *
 * For working with collections of Elements, see {@link Ext.CompositeElement}
 *
 * @constructor
 * Creates new Element directly.
 * @param {String/HTMLElement} element
 * @param {Boolean} [forceNew] By default the constructor checks to see if there is already an instance of this
 * element in the cache and if there is it returns the same instance. This will skip that check (useful for extending
 * this class).
 * @return {Object}
 */
(function() {

var HIDDEN = 'hidden',
    DOC             = document,
    VISIBILITY      = "visibility",
    DISPLAY         = "display",
    NONE            = "none",
    XMASKED         = Ext.baseCSSPrefix + "masked",
    XMASKEDRELATIVE = Ext.baseCSSPrefix + "masked-relative",
    EXTELMASKMSG    = Ext.baseCSSPrefix + "mask-msg",
    bodyRe          = /^body/i,
    visFly,

    // speedy lookup for elements never to box adjust
    noBoxAdjust = Ext.isStrict ? {
        select: 1
    }: {
        input: 1,
        select: 1,
        textarea: 1
    },

    // Pseudo for use by cacheScrollValues
    isScrolled = function(c) {
        var r = [], ri = -1,
            i, ci;
        for (i = 0; ci = c[i]; i++) {
            if (ci.scrollTop > 0 || ci.scrollLeft > 0) {
                r[++ri] = ci;
            }
        }
        return r;
    },

    Element = Ext.define('Ext.dom.Element', {

    extend: 'Ext.dom.AbstractElement',

    alternateClassName: ['Ext.Element', 'Ext.core.Element'],

    addUnits: function() {
        return this.self.addUnits.apply(this.self, arguments);
    },

    /**
     * Tries to focus the element. Any exceptions are caught and ignored.
     * @param {Number} [defer] Milliseconds to defer the focus
     * @return {Ext.dom.Element} this
     */
    focus: function(defer, /* private */ dom) {
        var me = this,
            scrollTop,
            body;

        dom = dom || me.dom;
        body = (dom.ownerDocument || DOC).body || DOC.body;
        try {
            if (Number(defer)) {
                Ext.defer(me.focus, defer, me, [null, dom]);
            } else {
                // Focusing a large element, the browser attempts to scroll as much of it into view
                // as possible. We need to override this behaviour.
                if (dom.offsetHeight > Element.getViewHeight()) {
                    scrollTop = body.scrollTop;
                }
                dom.focus();
                if (scrollTop !== undefined) {
                    body.scrollTop = scrollTop;
                }
            }
        } catch(e) {
        }
        return me;
    },

    /**
     * Tries to blur the element. Any exceptions are caught and ignored.
     * @return {Ext.dom.Element} this
     */
    blur: function() {
        try {
            this.dom.blur();
        } catch(e) {
        }
        return this;
    },

    /**
     * Tests various css rules/browsers to determine if this element uses a border box
     * @return {Boolean}
     */
    isBorderBox: function() {
        var box = Ext.isBorderBox;
        if (box) {
            box = !((this.dom.tagName || "").toLowerCase() in noBoxAdjust);
        }
        return box;
    },

    /**
     * Sets up event handlers to call the passed functions when the mouse is moved into and out of the Element.
     * @param {Function} overFn The function to call when the mouse enters the Element.
     * @param {Function} outFn The function to call when the mouse leaves the Element.
     * @param {Object} [scope] The scope (`this` reference) in which the functions are executed. Defaults
     * to the Element's DOM element.
     * @param {Object} [options] Options for the listener. See {@link Ext.util.Observable#addListener the
     * options parameter}.
     * @return {Ext.dom.Element} this
     */
    hover: function(overFn, outFn, scope, options) {
        var me = this;
        me.on('mouseenter', overFn, scope || me.dom, options);
        me.on('mouseleave', outFn, scope || me.dom, options);
        return me;
    },

    /**
     * Returns the value of a namespaced attribute from the element's underlying DOM node.
     * @param {String} namespace The namespace in which to look for the attribute
     * @param {String} name The attribute name
     * @return {String} The attribute value
     */
    getAttributeNS: function(ns, name) {
        return this.getAttribute(name, ns);
    },

    getAttribute: (Ext.isIE && !(Ext.isIE9 && DOC.documentMode === 9)) ?
        function(name, ns) {
            var d = this.dom,
                    type;
            if (ns) {
                type = typeof d[ns + ":" + name];
                if (type != 'undefined' && type != 'unknown') {
                    return d[ns + ":" + name] || null;
                }
                return null;
            }
            if (name === "for") {
                name = "htmlFor";
            }
            return d[name] || null;
        } : function(name, ns) {
            var d = this.dom;
            if (ns) {
                return d.getAttributeNS(ns, name) || d.getAttribute(ns + ":" + name);
            }
            return  d.getAttribute(name) || d[name] || null;
        },

    /**
     * When an element is moved around in the DOM, or is hidden using `display:none`, it loses layout, and therefore
     * all scroll positions of all descendant elements are lost.
     * 
     * This function caches them, and returns a function, which when run will restore the cached positions.
     * In the following example, the Panel is moved from one Container to another which will cause it to lose all scroll positions:
     * 
     *     var restoreScroll = myPanel.el.cacheScrollValues();
     *     myOtherContainer.add(myPanel);
     *     restoreScroll();
     * 
     * @return {Function} A function which will restore all descentant elements of this Element to their scroll
     * positions recorded when this function was executed. Be aware that the returned function is a closure which has
     * captured the scope of `cacheScrollValues`, so take care to derefence it as soon as not needed - if is it is a `var`
     * it will drop out of scope, and the reference will be freed.
     */
    cacheScrollValues: function() {
        var me = this,
            scrolledDescendants,
            el, i,
            scrollValues = [],
            result = function() {
                for (i = 0; i < scrolledDescendants.length; i++) {
                    el = scrolledDescendants[i];
                    el.scrollLeft = scrollValues[i][0];
                    el.scrollTop  = scrollValues[i][1];
                }
            };

        if (!Ext.DomQuery.pseudos.isScrolled) {
            Ext.DomQuery.pseudos.isScrolled = isScrolled;
        }
        scrolledDescendants = me.query(':isScrolled');
        for (i = 0; i < scrolledDescendants.length; i++) {
            el = scrolledDescendants[i];
            scrollValues[i] = [el.scrollLeft, el.scrollTop];
        }
        return result;
    },

    /**
     * @property {Boolean} autoBoxAdjust
     * True to automatically adjust width and height settings for box-model issues.
     */
    autoBoxAdjust: true,

    /**
     * Checks whether the element is currently visible using both visibility and display properties.
     * @param {Boolean} [deep=false] True to walk the dom and see if parent elements are hidden.
     * If false, the function only checks the visibility of the element itself and it may return
     * `true` even though a parent is not visible.
     * @return {Boolean} `true` if the element is currently visible, else `false`
     */
    isVisible : function(deep) {
        var me = this,
            dom = me.dom,
            stopNode = dom.ownerDocument.documentElement;

        if (!visFly) {
            visFly = new Element.Fly();
        }

        while (dom !== stopNode) {
            // We're invisible if we hit a nonexistent parentNode or a document
            // fragment or computed style visibility:hidden or display:none
            if (!dom || dom.nodeType === 11 || (visFly.attach(dom)).isStyle(VISIBILITY, HIDDEN) || visFly.isStyle(DISPLAY, NONE)) {
                return false;
            }
            // Quit now unless we are being asked to check parent nodes.
            if (!deep) {
                break;
            }
            dom = dom.parentNode;
        }
        return true;
    },

    /**
     * Returns true if display is not "none"
     * @return {Boolean}
     */
    isDisplayed : function() {
        return !this.isStyle(DISPLAY, NONE);
    },

    /**
     * Convenience method for setVisibilityMode(Element.DISPLAY)
     * @param {String} [display] What to set display to when visible
     * @return {Ext.dom.Element} this
     */
    enableDisplayMode : function(display) {
        var me = this;
        
        me.setVisibilityMode(Element.DISPLAY);

        if (!Ext.isEmpty(display)) {
            (me.$cache || me.getCache()).data.originalDisplay = display;
        }

        return me;
    },

    /**
     * Puts a mask over this element to disable user interaction. Requires core.css.
     * This method can only be applied to elements which accept child nodes.
     * @param {String} [msg] A message to display in the mask
     * @param {String} [msgCls] A css class to apply to the msg element
     * @return {Ext.dom.Element} The mask element
     */
    mask : function(msg, msgCls /* private - passed by AbstractComponent.mask to avoid the need to interrogate the DOM to get the height*/, elHeight) {
        var me            = this,
            dom           = me.dom,
            // In some cases, setExpression will exist but not be of a function type,
            // so we check it explicitly here to stop IE throwing errors
            setExpression = dom.style.setExpression,
            data          = (me.$cache || me.getCache()).data,
            maskEl        = data.maskEl,
            maskMsg       = data.maskMsg;

        if (!(bodyRe.test(dom.tagName) && me.getStyle('position') == 'static')) {
            me.addCls(XMASKEDRELATIVE);
        }
        
        // We always needs to recreate the mask since the DOM element may have been re-created
        if (maskEl) {
            maskEl.remove();
        }
        
        if (maskMsg) {
            maskMsg.remove();
        }

        Ext.DomHelper.append(dom, [{
            cls : Ext.baseCSSPrefix + "mask"
        }, {
            cls : msgCls ? EXTELMASKMSG + " " + msgCls : EXTELMASKMSG,
            cn  : {
                tag: 'div',
                html: msg || ''
            }
        }]);
            
        maskMsg = Ext.get(dom.lastChild);
        maskEl = Ext.get(maskMsg.dom.previousSibling);
        data.maskMsg = maskMsg;
        data.maskEl = maskEl;

        me.addCls(XMASKED);
        maskEl.setDisplayed(true);

        if (typeof msg == 'string') {
            maskMsg.setDisplayed(true);
            maskMsg.center(me);
        } else {
            maskMsg.setDisplayed(false);
        }
        // NOTE: CSS expressions are resource intensive and to be used only as a last resort
        // These expressions are removed as soon as they are no longer necessary - in the unmask method.
        // In normal use cases an element will be masked for a limited period of time.
        // Fix for https://sencha.jira.com/browse/EXTJSIV-19.
        // IE6 strict mode and IE6-9 quirks mode takes off left+right padding when calculating width!
        if (!Ext.supports.IncludePaddingInWidthCalculation && setExpression) {
            // In an occasional case setExpression will throw an exception
            try {
                maskEl.dom.style.setExpression('width', 'this.parentNode.clientWidth + "px"');
            } catch (e) {}
        }

        // Some versions and modes of IE subtract top+bottom padding when calculating height.
        // Different versions from those which make the same error for width!
        if (!Ext.supports.IncludePaddingInHeightCalculation && setExpression) {
            // In an occasional case setExpression will throw an exception
            try {
                maskEl.dom.style.setExpression('height', 'this.parentNode.' + (dom == DOC.body ? 'scrollHeight' : 'offsetHeight') + ' + "px"');
            } catch (e) {}
        }
        // ie will not expand full height automatically
        else if (Ext.isIE && !(Ext.isIE7 && Ext.isStrict) && me.getStyle('height') == 'auto') {
            maskEl.setSize(undefined, elHeight || me.getHeight());
        }
        return maskEl;
    },

    /**
     * Hides a previously applied mask.
     */
    unmask : function() {
        var me      = this,
            data    = (me.$cache || me.getCache()).data,
            maskEl  = data.maskEl,
            maskMsg = data.maskMsg,
            style;

        if (maskEl) {
            style = maskEl.dom.style;
            // Remove resource-intensive CSS expressions as soon as they are not required.
            if (style.clearExpression) {
                style.clearExpression('width');
                style.clearExpression('height');
            }
            
            if (maskEl) {
                maskEl.remove();
                delete data.maskEl;
            }
            
            if (maskMsg) {
                maskMsg.remove();
                delete data.maskMsg;
            }
            
            me.removeCls([XMASKED, XMASKEDRELATIVE]);
        }
    },

    /**
     * Returns true if this element is masked. Also re-centers any displayed message within the mask.
     * @return {Boolean}
     */
    isMasked : function() {
        var me      = this,
            data    = (me.$cache || me.getCache()).data,
            maskEl  = data.maskEl,
            maskMsg = data.maskMsg,
            hasMask = false; 

        if (maskEl && maskEl.isVisible()) {
            if (maskMsg) {
                maskMsg.center(me);
            }
            hasMask = true;
        }
        return hasMask;
    },

    /**
     * Creates an iframe shim for this element to keep selects and other windowed objects from
     * showing through.
     * @return {Ext.dom.Element} The new shim element
     */
    createShim : function() {
        var el = DOC.createElement('iframe'),
            shim;

        el.frameBorder = '0';
        el.className = Ext.baseCSSPrefix + 'shim';
        el.src = Ext.SSL_SECURE_URL;
        shim = Ext.get(this.dom.parentNode.insertBefore(el, this.dom));
        shim.autoBoxAdjust = false;
        return shim;
    },

    /**
     * Convenience method for constructing a KeyMap
     * @param {String/Number/Number[]/Object} key Either a string with the keys to listen for, the numeric key code,
     * array of key codes or an object with the following options:
     * @param {Number/Array} key.key
     * @param {Boolean} key.shift
     * @param {Boolean} key.ctrl
     * @param {Boolean} key.alt
     * @param {Function} fn The function to call
     * @param {Object} [scope] The scope (`this` reference) in which the specified function is executed. Defaults to this Element.
     * @return {Ext.util.KeyMap} The KeyMap created
     */
    addKeyListener : function(key, fn, scope){
        var config;
        if(typeof key != 'object' || Ext.isArray(key)){
            config = {
                target: this,
                key: key,
                fn: fn,
                scope: scope
            };
        }else{
            config = {
                target: this,
                key : key.key,
                shift : key.shift,
                ctrl : key.ctrl,
                alt : key.alt,
                fn: fn,
                scope: scope
            };
        }
        return new Ext.util.KeyMap(config);
    },

    /**
     * Creates a KeyMap for this element
     * @param {Object} config The KeyMap config. See {@link Ext.util.KeyMap} for more details
     * @return {Ext.util.KeyMap} The KeyMap created
     */
    addKeyMap : function(config) {
        return new Ext.util.KeyMap(Ext.apply({
            target: this
        }, config));
    },

    //  Mouse events
    /**
     * @event click
     * Fires when a mouse click is detected within the element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event contextmenu
     * Fires when a right click is detected within the element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event dblclick
     * Fires when a mouse double click is detected within the element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event mousedown
     * Fires when a mousedown is detected within the element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event mouseup
     * Fires when a mouseup is detected within the element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event mouseover
     * Fires when a mouseover is detected within the element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event mousemove
     * Fires when a mousemove is detected with the element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event mouseout
     * Fires when a mouseout is detected with the element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event mouseenter
     * Fires when the mouse enters the element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event mouseleave
     * Fires when the mouse leaves the element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */

    //  Keyboard events
    /**
     * @event keypress
     * Fires when a keypress is detected within the element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event keydown
     * Fires when a keydown is detected within the element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event keyup
     * Fires when a keyup is detected within the element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */

    //  HTML frame/object events
    /**
     * @event load
     * Fires when the user agent finishes loading all content within the element. Only supported by window, frames,
     * objects and images.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event unload
     * Fires when the user agent removes all content from a window or frame. For elements, it fires when the target
     * element or any of its content has been removed.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event abort
     * Fires when an object/image is stopped from loading before completely loaded.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event error
     * Fires when an object/image/frame cannot be loaded properly.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event resize
     * Fires when a document view is resized.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event scroll
     * Fires when a document view is scrolled.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */

    //  Form events
    /**
     * @event select
     * Fires when a user selects some text in a text field, including input and textarea.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event change
     * Fires when a control loses the input focus and its value has been modified since gaining focus.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event submit
     * Fires when a form is submitted.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event reset
     * Fires when a form is reset.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event focus
     * Fires when an element receives focus either via the pointing device or by tab navigation.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event blur
     * Fires when an element loses focus either via the pointing device or by tabbing navigation.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */

    //  User Interface events
    /**
     * @event DOMFocusIn
     * Where supported. Similar to HTML focus event, but can be applied to any focusable element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event DOMFocusOut
     * Where supported. Similar to HTML blur event, but can be applied to any focusable element.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event DOMActivate
     * Where supported. Fires when an element is activated, for instance, through a mouse click or a keypress.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */

    //  DOM Mutation events
    /**
     * @event DOMSubtreeModified
     * Where supported. Fires when the subtree is modified.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event DOMNodeInserted
     * Where supported. Fires when a node has been added as a child of another node.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event DOMNodeRemoved
     * Where supported. Fires when a descendant node of the element is removed.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event DOMNodeRemovedFromDocument
     * Where supported. Fires when a node is being removed from a document.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event DOMNodeInsertedIntoDocument
     * Where supported. Fires when a node is being inserted into a document.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event DOMAttrModified
     * Where supported. Fires when an attribute has been modified.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */
    /**
     * @event DOMCharacterDataModified
     * Where supported. Fires when the character data has been modified.
     * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
     * @param {HTMLElement} t The target of the event.
     */

    /**
     * Appends an event handler to this element.
     *
     * @param {String} eventName The name of event to handle.
     *
     * @param {Function} fn The handler function the event invokes. This function is passed the following parameters:
     *
     * - **evt** : EventObject
     *
     *   The {@link Ext.EventObject EventObject} describing the event.
     *
     * - **el** : HtmlElement
     *
     *   The DOM element which was the target of the event. Note that this may be filtered by using the delegate option.
     *
     * - **o** : Object
     *
     *   The options object from the call that setup the listener.
     *
     * @param {Object} scope (optional) The scope (**this** reference) in which the handler function is executed. **If
     * omitted, defaults to this Element.**
     *
     * @param {Object} options (optional) An object containing handler configuration properties. This may contain any of
     * the following properties:
     *
     * - **scope** Object :
     *
     *   The scope (**this** reference) in which the handler function is executed. **If omitted, defaults to this
     *   Element.**
     *
     * - **delegate** String:
     *
     *   A simple selector to filter the target or look for a descendant of the target. See below for additional details.
     *
     * - **stopEvent** Boolean:
     *
     *   True to stop the event. That is stop propagation, and prevent the default action.
     *
     * - **preventDefault** Boolean:
     *
     *   True to prevent the default action
     *
     * - **stopPropagation** Boolean:
     *
     *   True to prevent event propagation
     *
     * - **normalized** Boolean:
     *
     *   False to pass a browser event to the handler function instead of an Ext.EventObject
     *
     * - **target** Ext.dom.Element:
     *
     *   Only call the handler if the event was fired on the target Element, _not_ if the event was bubbled up from a
     *   child node.
     *
     * - **delay** Number:
     *
     *   The number of milliseconds to delay the invocation of the handler after the event fires.
     *
     * - **single** Boolean:
     *
     *   True to add a handler to handle just the next firing of the event, and then remove itself.
     *
     * - **buffer** Number:
     *
     *   Causes the handler to be scheduled to run in an {@link Ext.util.DelayedTask} delayed by the specified number of
     *   milliseconds. If the event fires again within that time, the original handler is _not_ invoked, but the new
     *   handler is scheduled in its place.
     *
     * **Combining Options**
     *
     * Using the options argument, it is possible to combine different types of listeners:
     *
     * A delayed, one-time listener that auto stops the event and adds a custom argument (forumId) to the options
     * object. The options object is available as the third parameter in the handler function.
     *
     * Code:
     *
     *     el.on('click', this.onClick, this, {
     *         single: true,
     *         delay: 100,
     *         stopEvent : true,
     *         forumId: 4
     *     });
     *
     * **Attaching multiple handlers in 1 call**
     *
     * The method also allows for a single argument to be passed which is a config object containing properties which
     * specify multiple handlers.
     *
     * Code:
     *
     *     el.on({
     *         'click' : {
     *             fn: this.onClick,
     *             scope: this,
     *             delay: 100
     *         },
     *         'mouseover' : {
     *             fn: this.onMouseOver,
     *             scope: this
     *         },
     *         'mouseout' : {
     *             fn: this.onMouseOut,
     *             scope: this
     *         }
     *     });
     *
     * Or a shorthand syntax:
     *
     * Code:
     *
     *     el.on({
     *         'click' : this.onClick,
     *         'mouseover' : this.onMouseOver,
     *         'mouseout' : this.onMouseOut,
     *         scope: this
     *     });
     *
     * **delegate**
     *
     * This is a configuration option that you can pass along when registering a handler for an event to assist with
     * event delegation. Event delegation is a technique that is used to reduce memory consumption and prevent exposure
     * to memory-leaks. By registering an event for a container element as opposed to each element within a container.
     * By setting this configuration option to a simple selector, the target element will be filtered to look for a
     * descendant of the target. For example:
     *
     *     // using this markup:
     *     <div id='elId'>
     *         <p id='p1'>paragraph one</p>
     *         <p id='p2' class='clickable'>paragraph two</p>
     *         <p id='p3'>paragraph three</p>
     *     </div>
     *
     *     // utilize event delegation to registering just one handler on the container element:
     *     el = Ext.get('elId');
     *     el.on(
     *         'click',
     *         function(e,t) {
     *             // handle click
     *             console.info(t.id); // 'p2'
     *         },
     *         this,
     *         {
     *             // filter the target element to be a descendant with the class 'clickable'
     *             delegate: '.clickable'
     *         }
     *     );
     *
     * @return {Ext.dom.Element} this
     */
    on: function(eventName, fn, scope, options) {
        Ext.EventManager.on(this, eventName, fn, scope || this, options);
        return this;
    },

    /**
     * Removes an event handler from this element.
     *
     * **Note**: if a *scope* was explicitly specified when {@link #on adding} the listener,
     * the same scope must be specified here.
     *
     * Example:
     *
     *     el.un('click', this.handlerFn);
     *     // or
     *     el.removeListener('click', this.handlerFn);
     *
     * @param {String} eventName The name of the event from which to remove the handler.
     * @param {Function} fn The handler function to remove. **This must be a reference to the function passed into the
     * {@link #on} call.**
     * @param {Object} scope If a scope (**this** reference) was specified when the listener was added, then this must
     * refer to the same object.
     * @return {Ext.dom.Element} this
     */
    un: function(eventName, fn, scope) {
        Ext.EventManager.un(this, eventName, fn, scope || this);
        return this;
    },

    /**
     * Removes all previous added listeners from this element
     * @return {Ext.dom.Element} this
     */
    removeAllListeners: function() {
        Ext.EventManager.removeAll(this);
        return this;
    },

    /**
     * Recursively removes all previous added listeners from this element and its children
     * @return {Ext.dom.Element} this
     */
    purgeAllListeners: function() {
        Ext.EventManager.purgeElement(this);
        return this;
    }

}, function() {

    var EC              = Ext.cache,
        El              = this,
        AbstractElement = Ext.dom.AbstractElement,
        focusRe         = /a|button|embed|iframe|img|input|object|select|textarea/i,
        nonSpaceRe      = /\S/,
        scriptTagRe     = /(?:<script([^>]*)?>)((\n|\r|.)*?)(?:<\/script>)/ig,
        replaceScriptTagRe = /(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)/ig,
        srcRe           = /\ssrc=([\'\"])(.*?)\1/i,
        typeRe          = /\stype=([\'\"])(.*?)\1/i,
        useDocForId = !(Ext.isIE6 || Ext.isIE7 || Ext.isIE8);

    El.boxMarkup = '<div class="{0}-tl"><div class="{0}-tr"><div class="{0}-tc"></div></div></div><div class="{0}-ml"><div class="{0}-mr"><div class="{0}-mc"></div></div></div><div class="{0}-bl"><div class="{0}-br"><div class="{0}-bc"></div></div></div>';
    //</!if>

    // private
    // Garbage collection - uncache elements/purge listeners on orphaned elements
    // so we don't hold a reference and cause the browser to retain them
    function garbageCollect() {
        if (!Ext.enableGarbageCollector) {
            clearInterval(El.collectorThreadId);
        } else {
            var eid,
                d,
                o,
                t;

            for (eid in EC) {
                if (!EC.hasOwnProperty(eid)) {
                    continue;
                }

                o = EC[eid];

                // Skip document and window elements
                if (o.skipGarbageCollection) {
                    continue;
                }

                d = o.dom;

                //<debug>
                // Should always have a DOM node
                if (!d) {
                    Ext.Error.raise('Missing DOM node in element garbage collection: ' + eid);
                }

                // Check that document and window elements haven't got through
                if (d && (d.getElementById || d.navigator)) {
                    Ext.Error.raise('Unexpected document or window element in element garbage collection');
                }
                //</debug>

                // -------------------------------------------------------
                // Determining what is garbage:
                // -------------------------------------------------------
                // !d.parentNode
                // no parentNode == direct orphan, definitely garbage
                // -------------------------------------------------------
                // !d.offsetParent && !document.getElementById(eid)
                // display none elements have no offsetParent so we will
                // also try to look it up by it's id. However, check
                // offsetParent first so we don't do unneeded lookups.
                // This enables collection of elements that are not orphans
                // directly, but somewhere up the line they have an orphan
                // parent.
                // -------------------------------------------------------
                if (!d.parentNode || (!d.offsetParent && !Ext.getElementById(eid))) {
                    if (d && Ext.enableListenerCollection) {
                        Ext.EventManager.removeAll(d);
                    }
                    delete EC[eid];
                }
            }
            // Cleanup IE Object leaks
            if (Ext.isIE) {
                t = {};
                for (eid in EC) {
                    if (!EC.hasOwnProperty(eid)) {
                        continue;
                    }
                    t[eid] = EC[eid];
                }
                EC = Ext.cache = t;
            }
        }
    }

    El.collectorThreadId = setInterval(garbageCollect, 30000);

    //Stuff from Element-more.js
    El.addMethods({

        /**
         * Monitors this Element for the mouse leaving. Calls the function after the specified delay only if
         * the mouse was not moved back into the Element within the delay. If the mouse *was* moved
         * back in, the function is not called.
         * @param {Number} delay The delay **in milliseconds** to wait for possible mouse re-entry before calling the handler function.
         * @param {Function} handler The function to call if the mouse remains outside of this Element for the specified time.
         * @param {Object} [scope] The scope (`this` reference) in which the handler function executes. Defaults to this Element.
         * @return {Object} The listeners object which was added to this element so that monitoring can be stopped. Example usage:
         *
         *     // Hide the menu if the mouse moves out for 250ms or more
         *     this.mouseLeaveMonitor = this.menuEl.monitorMouseLeave(250, this.hideMenu, this);
         *
         *     ...
         *     // Remove mouseleave monitor on menu destroy
         *     this.menuEl.un(this.mouseLeaveMonitor);
         *
         */
        monitorMouseLeave: function(delay, handler, scope) {
            var me = this,
                timer,
                listeners = {
                    mouseleave: function(e) {
                        timer = setTimeout(Ext.Function.bind(handler, scope||me, [e]), delay);
                    },
                    mouseenter: function() {
                        clearTimeout(timer);
                    },
                    freezeEvent: true
                };

            me.on(listeners);
            return listeners;
        },

        /**
         * Stops the specified event(s) from bubbling and optionally prevents the default action
         * @param {String/String[]} eventName an event / array of events to stop from bubbling
         * @param {Boolean} [preventDefault] true to prevent the default action too
         * @return {Ext.dom.Element} this
         */
        swallowEvent : function(eventName, preventDefault) {
            var me = this,
                e, eLen;
            function fn(e) {
                e.stopPropagation();
                if (preventDefault) {
                    e.preventDefault();
                }
            }

            if (Ext.isArray(eventName)) {
                eLen = eventName.length;

                for (e = 0; e < eLen; e++) {
                    me.on(eventName[e], fn);
                }

                return me;
            }
            me.on(eventName, fn);
            return me;
        },

        /**
         * Create an event handler on this element such that when the event fires and is handled by this element,
         * it will be relayed to another object (i.e., fired again as if it originated from that object instead).
         * @param {String} eventName The type of event to relay
         * @param {Object} observable Any object that extends {@link Ext.util.Observable} that will provide the context
         * for firing the relayed event
         */
        relayEvent : function(eventName, observable) {
            this.on(eventName, function(e) {
                observable.fireEvent(eventName, e);
            });
        },

        /**
         * Removes Empty, or whitespace filled text nodes. Combines adjacent text nodes.
         * @param {Boolean} [forceReclean=false] By default the element keeps track if it has been cleaned already
         * so you can call this over and over. However, if you update the element and need to force a reclean, you
         * can pass true.
         */
        clean : function(forceReclean) {
            var me   = this,
                dom  = me.dom,
                data = (me.$cache || me.getCache()).data,
                n    = dom.firstChild,
                ni   = -1,
                nx;

            if (data.isCleaned && forceReclean !== true) {
                return me;
            }

            while (n) {
                nx = n.nextSibling;
                if (n.nodeType == 3) {
                    // Remove empty/whitespace text nodes
                    if (!(nonSpaceRe.test(n.nodeValue))) {
                        dom.removeChild(n);
                    // Combine adjacent text nodes
                    } else if (nx && nx.nodeType == 3) {
                        n.appendData(Ext.String.trim(nx.data));
                        dom.removeChild(nx);
                        nx = n.nextSibling;
                        n.nodeIndex = ++ni;
                    }
                } else {
                    // Recursively clean
                    Ext.fly(n).clean();
                    n.nodeIndex = ++ni;
                }
                n = nx;
            }

            data.isCleaned = true;
            return me;
        },

        /**
         * Direct access to the Ext.ElementLoader {@link Ext.ElementLoader#method-load} method. The method takes the same object
         * parameter as {@link Ext.ElementLoader#method-load}
         * @return {Ext.dom.Element} this
         */
        load : function(options) {
            this.getLoader().load(options);
            return this;
        },

        /**
         * Gets this element's {@link Ext.ElementLoader ElementLoader}
         * @return {Ext.ElementLoader} The loader
         */
        getLoader : function() {
            var me = this,
                data = (me.$cache || me.getCache()).data,
                loader = data.loader;

            if (!loader) {
                data.loader = loader = new Ext.ElementLoader({
                    target: me
                });
            }
            return loader;
        },

        /**
         * @private.
         * Currently used for updating grid cells without modifying DOM structure
         *
         * Synchronizes content of this Element with the content of the passed element.
         * 
         * Style and CSS class are copied from source into this Element, and contents are synched
         * recursively. If a child node is a text node, the textual data is copied.
         */
        syncContent: function(source) {
            source = Ext.getDom(source);
            var me = this,
                sourceNodes = source.childNodes,
                sourceLen = sourceNodes.length,
                dest = me.dom,
                destNodes = dest.childNodes,
                destLen = destNodes.length,
                i,  destNode, sourceNode,
                nodeType;

            // Copy top node's style and CSS class
            dest.style.cssText = source.style.cssText;
            dest.className = source.className;

            // If the number of child nodes does not match, fall back to replacing innerHTML
            if (sourceLen !== destLen) {
                source.innerHTML = dest.innerHTML;
                return;
            }

            // Loop through source nodes.
            // If there are fewer, we must remove excess
            for (i = 0; i < sourceLen; i++) {
                sourceNode = sourceNodes[i];
                destNode = destNodes[i];
                nodeType = sourceNode.nodeType;

                // If node structure is out of sync, just drop innerHTML in and return
                if (nodeType !== destNode.nodeType || (nodeType === 1 && sourceNode.tagName !== destNode.tagName)) {
                    dest.innerHTML = source.innerHTML;
                    return;
                }

                // Update text node
                if (nodeType === 3) {
                    destNode.data = sourceNode.data;
                }
                // Sync element content
                else {
                    if (sourceNode.id && destNode.id !== sourceNode.id) {
                        destNode.id = sourceNode.id;
                    }
                    destNode.style.cssText = sourceNode.style.cssText;
                    destNode.className = sourceNode.className;
                    Ext.fly(destNode).syncContent(sourceNode);
                }
            }
        },

        /**
         * Updates the innerHTML of this element, optionally searching for and processing scripts.
         * @param {String} html The new HTML
         * @param {Boolean} [loadScripts] True to look for and process scripts (defaults to false)
         * @param {Function} [callback] For async script loading you can be notified when the update completes
         * @return {Ext.dom.Element} this
         */
        update : function(html, loadScripts, callback) {
            var me = this,
                id,
                dom,
                interval;

            if (!me.dom) {
                return me;
            }
            html = html || '';
            dom = me.dom;

            if (loadScripts !== true) {
                dom.innerHTML = html;
                Ext.callback(callback, me);
                return me;
            }

            id  = Ext.id();
            html += '<span id="' + id + '"></span>';

            interval = setInterval(function() {
                var hd,
                    match,
                    attrs,
                    srcMatch,
                    typeMatch,
                    el,
                    s;
                if (!(el = DOC.getElementById(id))) {
                    return false;
                }
                clearInterval(interval);
                Ext.removeNode(el);
                hd = Ext.getHead().dom;

                while ((match = scriptTagRe.exec(html))) {
                    attrs = match[1];
                    srcMatch = attrs ? attrs.match(srcRe) : false;
                    if (srcMatch && srcMatch[2]) {
                       s = DOC.createElement("script");
                       s.src = srcMatch[2];
                       typeMatch = attrs.match(typeRe);
                       if (typeMatch && typeMatch[2]) {
                           s.type = typeMatch[2];
                       }
                       hd.appendChild(s);
                    } else if (match[2] && match[2].length > 0) {
                        if (window.execScript) {
                           window.execScript(match[2]);
                        } else {
                           window.eval(match[2]);
                        }
                    }
                }
                Ext.callback(callback, me);
            }, 20);
            dom.innerHTML = html.replace(replaceScriptTagRe, '');
            return me;
        },

        // inherit docs, overridden so we can add removeAnchor
        removeAllListeners : function() {
            this.removeAnchor();
            Ext.EventManager.removeAll(this.dom);
            return this;
        },

        /**
         * Creates a proxy element of this element
         * @param {String/Object} config The class name of the proxy element or a DomHelper config object
         * @param {String/HTMLElement} [renderTo] The element or element id to render the proxy to. Defaults to: document.body.
         * @param {Boolean} [matchBox=false] True to align and size the proxy to this element now.
         * @return {Ext.dom.Element} The new proxy element
         */
        createProxy : function(config, renderTo, matchBox) {
            config = (typeof config == 'object') ? config : {tag : "div", cls: config};

            var me = this,
                proxy = renderTo ? Ext.DomHelper.append(renderTo, config, true) :
                                   Ext.DomHelper.insertBefore(me.dom, config, true);

            proxy.setVisibilityMode(Element.DISPLAY);
            proxy.hide();
            if (matchBox && me.setBox && me.getBox) { // check to make sure Element.position.js is loaded
               proxy.setBox(me.getBox());
            }
            return proxy;
        },
        
        /**
         * Gets the parent node of the current element taking into account Ext.scopeResetCSS
         * @protected
         * @return {HTMLElement} The parent element
         */
        getScopeParent: function() {
            var parent = this.dom.parentNode;
            if (Ext.scopeResetCSS) {
                // If it's a normal reset, we will be wrapped in a single x-reset element, so grab the parent
                parent = parent.parentNode;
                if (!Ext.supports.CSS3LinearGradient || !Ext.supports.CSS3BorderRadius) {
                    // In the cases where we have nbr or nlg, it will be wrapped in a second element,
                    // so we need to go and get the parent again.
                    parent = parent.parentNode;
                }
            }
            return parent;
        },

        /**
         * Returns true if this element needs an explicit tabIndex to make it focusable. Input fields, text areas, buttons
         * anchors elements **with an href** etc do not need a tabIndex, but structural elements do.
         */
        needsTabIndex: function() {
            if (this.dom) {
                if ((this.dom.nodeName === 'a') && (!this.dom.href)) {
                    return true;
                }
                return !focusRe.test(this.dom.nodeName);
            }
        },

        /**
         * Checks whether this element can be focused.
         * @return {Boolean} True if the element is focusable
         */
        focusable: function () {
            var dom = this.dom,
                nodeName = dom.nodeName,
                canFocus = false;

            if (!dom.disabled) {
                if (focusRe.test(nodeName)) {
                    if ((nodeName !== 'a') || dom.href) {
                        canFocus = true;
                    }
                } else {
                    canFocus = !isNaN(dom.tabIndex);
                }
            }
            return canFocus && this.isVisible(true);
        }
    });

    if (Ext.isIE) {
        El.prototype.getById = function (id, asDom) {
            var dom = this.dom,
                cacheItem, el, ret;

            if (dom) {
                // for normal elements getElementById is the best solution, but if the el is
                // not part of the document.body, we need to use all[]
                el = (useDocForId && DOC.getElementById(id)) || dom.all[id];
                if (el) {
                    if (asDom) {
                        ret = el;
                    } else {
                        // calling El.get here is a real hit (2x slower) because it has to
                        // redetermine that we are giving it a dom el.
                        cacheItem = EC[id];
                        if (cacheItem && cacheItem.el) {
                            ret = Ext.updateCacheEntry(cacheItem, el).el;
                        } else {
                            ret = new Element(el);
                        }
                    }
                    return ret;
                }
            }

            return asDom ? Ext.getDom(id) : El.get(id);
        };
    }

    El.createAlias({
        /**
         * @method
         * @inheritdoc Ext.dom.Element#on
         * Shorthand for {@link #on}.
         */
        addListener: 'on',
        /**
         * @method
         * @inheritdoc Ext.dom.Element#un
         * Shorthand for {@link #un}.
         */
        removeListener: 'un',
        /**
         * @method
         * @inheritdoc Ext.dom.Element#removeAllListeners
         * Alias for {@link #removeAllListeners}.
         */
        clearListeners: 'removeAllListeners'
    });

    El.Fly = AbstractElement.Fly = new Ext.Class({
        extend: El,

        constructor: function(dom) {
            this.dom = dom;
        },
        
        attach: AbstractElement.Fly.prototype.attach
    });

    if (Ext.isIE) {
        Ext.getElementById = function (id) {
            var el = DOC.getElementById(id),
                detachedBodyEl;

            if (!el && (detachedBodyEl = AbstractElement.detachedBodyEl)) {
                el = detachedBodyEl.dom.all[id];
            }

            return el;
        };
    } else if (!DOC.querySelector) {
        Ext.getDetachedBody = Ext.getBody;

        Ext.getElementById = function (id) {
            return DOC.getElementById(id);
        };
    }
});

}());
