/**
 * @class Ext.EventManager
 * Registers event handlers that want to receive a normalized EventObject instead of the standard browser event and provides
 * several useful events directly.
 * See {@link Ext.EventObject} for more details on normalized event objects.
 * @singleton
 */
Ext.EventManager = new function() {
    var EventManager = this,
        doc = document,
        win = window,
        initExtCss = function() {
            // find the body element
            var bd = doc.body || doc.getElementsByTagName('body')[0],
                baseCSSPrefix = Ext.baseCSSPrefix,
                cls = [baseCSSPrefix + 'body'],
                htmlCls = [],
                supportsLG = Ext.supports.CSS3LinearGradient,
                supportsBR = Ext.supports.CSS3BorderRadius,
                resetCls = [],
                html,
                resetElementSpec;

            if (!bd) {
                return false;
            }

            html = bd.parentNode;

            function add (c) {
                cls.push(baseCSSPrefix + c);
            }

            //Let's keep this human readable!
            if (Ext.isIE) {
                add('ie');

                // very often CSS needs to do checks like "IE7+" or "IE6 or 7". To help
                // reduce the clutter (since CSS/SCSS cannot do these tests), we add some
                // additional classes:
                //
                //      x-ie7p      : IE7+      :  7 <= ieVer
                //      x-ie7m      : IE7-      :  ieVer <= 7
                //      x-ie8p      : IE8+      :  8 <= ieVer
                //      x-ie8m      : IE8-      :  ieVer <= 8
                //      x-ie9p      : IE9+      :  9 <= ieVer
                //      x-ie78      : IE7 or 8  :  7 <= ieVer <= 8
                //
                if (Ext.isIE6) {
                    add('ie6');
                } else { // ignore pre-IE6 :)
                    add('ie7p');

                    if (Ext.isIE7) {
                        add('ie7');
                    } else {
                        add('ie8p');

                        if (Ext.isIE8) {
                            add('ie8');
                        } else {
                            add('ie9p');

                            if (Ext.isIE9) {
                                add('ie9');
                            }
                        }
                    }
                }

                if (Ext.isIE6 || Ext.isIE7) {
                    add('ie7m');
                }
                if (Ext.isIE6 || Ext.isIE7 || Ext.isIE8) {
                    add('ie8m');
                }
                if (Ext.isIE7 || Ext.isIE8) {
                    add('ie78');
                }
            }
            if (Ext.isGecko) {
                add('gecko');
                if (Ext.isGecko3) {
                    add('gecko3');
                }
                if (Ext.isGecko4) {
                    add('gecko4');
                }
                if (Ext.isGecko5) {
                    add('gecko5');
                }
            }
            if (Ext.isOpera) {
                add('opera');
            }
            if (Ext.isWebKit) {
                add('webkit');
            }
            if (Ext.isSafari) {
                add('safari');
                if (Ext.isSafari2) {
                    add('safari2');
                }
                if (Ext.isSafari3) {
                    add('safari3');
                }
                if (Ext.isSafari4) {
                    add('safari4');
                }
                if (Ext.isSafari5) {
                    add('safari5');
                }
                if (Ext.isSafari5_0) {
                    add('safari5_0')
                }
            }
            if (Ext.isChrome) {
                add('chrome');
            }
            if (Ext.isMac) {
                add('mac');
            }
            if (Ext.isLinux) {
                add('linux');
            }
            if (!supportsBR) {
                add('nbr');
            }
            if (!supportsLG) {
                add('nlg');
            }

            // If we are not globally resetting scope, but just resetting it in a wrapper around
            // serarately rendered widgets, then create a common reset element for use when creating
            // measurable elements. Using a common DomHelper spec.
            if (Ext.scopeResetCSS) {

                // Create Ext.resetElementSpec for use in Renderable when wrapping top level Components.
                resetElementSpec = Ext.resetElementSpec = {
                    cls: baseCSSPrefix + 'reset'
                };
                
                if (!supportsLG) {
                    resetCls.push(baseCSSPrefix + 'nlg');
                }
                
                if (!supportsBR) {
                    resetCls.push(baseCSSPrefix + 'nbr');
                }
                
                if (resetCls.length) {                    
                    resetElementSpec.cn = {
                        cls: resetCls.join(' ')
                    };
                }
                
                Ext.resetElement = Ext.getBody().createChild(resetElementSpec);
                if (resetCls.length) {
                    Ext.resetElement = Ext.get(Ext.resetElement.dom.firstChild);
                }
            }
            // Otherwise, the common reset element is the document body
            else {
                Ext.resetElement = Ext.getBody();
                add('reset');
            }

            // add to the parent to allow for selectors x-strict x-border-box, also set the isBorderBox property correctly
            if (html) {
                if (Ext.isStrict && (Ext.isIE6 || Ext.isIE7)) {
                    Ext.isBorderBox = false;
                }
                else {
                    Ext.isBorderBox = true;
                }

                if(Ext.isBorderBox) {
                    htmlCls.push(baseCSSPrefix + 'border-box');
                }
                if (Ext.isStrict) {
                    htmlCls.push(baseCSSPrefix + 'strict');
                } else {
                    htmlCls.push(baseCSSPrefix + 'quirks');
                }
                Ext.fly(html, '_internal').addCls(htmlCls);
            }

            Ext.fly(bd, '_internal').addCls(cls);
            return true;
        };

    Ext.apply(EventManager, {
        /**
         * Check if we have bound our global onReady listener
         * @private
         */
        hasBoundOnReady: false,

        /**
         * Check if fireDocReady has been called
         * @private
         */
        hasFiredReady: false,

        /**
         * Additionally, allow the 'DOM' listener thread to complete (usually desirable with mobWebkit, Gecko)
         * before firing the entire onReady chain (high stack load on Loader) by specifying a delay value
         * @default 1ms
         * @private
         */
        deferReadyEvent : 1,

        /*
         * diags: a list of event names passed to onReadyEvent (in chron order)
         * @private
         */
        onReadyChain : [],

        /**
         * Holds references to any onReady functions
         * @private
         */
        readyEvent:
            (function () {
                var event = new Ext.util.Event();
                event.fire = function () {
                    Ext._beforeReadyTime = Ext._beforeReadyTime || new Date().getTime();
                    event.self.prototype.fire.apply(event, arguments);
                    Ext._afterReadytime = new Date().getTime();
                };
                return event;
            }()),

        /**
         * Fires when a DOM event handler finishes its run, just before returning to browser control.
         * This can be useful for performing cleanup, or upfdate tasks which need to happen only
         * after all code in an event handler has been run, but which should not be executed in a timer
         * due to the intervening browser reflow/repaint which would take place.
         *
         */
        idleEvent: new Ext.util.Event(),

        /**
         * detects whether the EventManager has been placed in a paused state for synchronization
         * with external debugging / perf tools (PageAnalyzer)
         * @private
         */
        isReadyPaused: function(){
            return (/[?&]ext-pauseReadyFire\b/i.test(location.search) && !Ext._continueFireReady);
        },

        /**
         * Binds the appropriate browser event for checking if the DOM has loaded.
         * @private
         */
        bindReadyEvent: function() {
            if (EventManager.hasBoundOnReady) {
                return;
            }

            // Test scenario where Core is dynamically loaded AFTER window.load
            if ( doc.readyState == 'complete'  ) {  // Firefox4+ got support for this state, others already do.
                EventManager.onReadyEvent({
                    type: doc.readyState || 'body'
                });
            } else {
                document.addEventListener('DOMContentLoaded', EventManager.onReadyEvent, false);
                window.addEventListener('load', EventManager.onReadyEvent, false);
                EventManager.hasBoundOnReady = true;
            }
        },

        onReadyEvent : function(e) {
            if (e && e.type) {
                EventManager.onReadyChain.push(e.type);
            }

            if (EventManager.hasBoundOnReady) {
                document.removeEventListener('DOMContentLoaded', EventManager.onReadyEvent, false);
                window.removeEventListener('load', EventManager.onReadyEvent, false);
            }

            if (!Ext.isReady) {
                EventManager.fireDocReady();
            }
        },

        /**
         * We know the document is loaded, so trigger any onReady events.
         * @private
         */
        fireDocReady: function() {
            if (!Ext.isReady) {
                Ext._readyTime = new Date().getTime();
                Ext.isReady = true;

                Ext.supports.init();
                EventManager.onWindowUnload();
                EventManager.readyEvent.onReadyChain = EventManager.onReadyChain;    //diags report

                if (Ext.isNumber(EventManager.deferReadyEvent)) {
                    Ext.Function.defer(EventManager.fireReadyEvent, EventManager.deferReadyEvent);
                    EventManager.hasDocReadyTimer = true;
                } else {
                    EventManager.fireReadyEvent();
                }
            }
        },

        /**
         * Fires the ready event
         * @private
         */
        fireReadyEvent: function(){
            var readyEvent = EventManager.readyEvent;

            // Unset the timer flag here since other onReady events may be
            // added during the fire() call and we don't want to block them
            EventManager.hasDocReadyTimer = false;
            EventManager.isFiring = true;

            // Ready events are all single: true, if we get to the end
            // & there are more listeners, it means they were added
            // inside some other ready event
            while (readyEvent.listeners.length && !EventManager.isReadyPaused()) {
                readyEvent.fire();
            }
            EventManager.isFiring = false;
            EventManager.hasFiredReady = true;
        },

        /**
         * Adds a listener to be notified when the document is ready (before onload and before images are loaded).
         *
         * @param {Function} fn The method the event invokes.
         * @param {Object} [scope] The scope (`this` reference) in which the handler function executes.
         * Defaults to the browser window.
         * @param {Object} [options] Options object as passed to {@link Ext.Element#addListener}.
         */
        onDocumentReady: function(fn, scope, options) {
            options = options || {};
            // force single, only ever fire it once
            options.single = true;
            EventManager.readyEvent.addListener(fn, scope, options);

            // If we're in the middle of firing, or we have a deferred timer
            // pending, drop out since the event will be fired  later
            if (!(EventManager.isFiring || EventManager.hasDocReadyTimer)) {
                if (Ext.isReady) {
                    EventManager.fireReadyEvent();
                } else {
                    EventManager.bindReadyEvent();
                }
            }
        },

        // --------------------- event binding ---------------------

        /**
         * Contains a list of all document mouse downs, so we can ensure they fire even when stopEvent is called.
         * @private
         */
        stoppedMouseDownEvent: new Ext.util.Event(),

        /**
         * Options to parse for the 4th argument to addListener.
         * @private
         */
        propRe: /^(?:scope|delay|buffer|single|stopEvent|preventDefault|stopPropagation|normalized|args|delegate|freezeEvent)$/,

        /**
         * Get the id of the element. If one has not been assigned, automatically assign it.
         * @param {HTMLElement/Ext.Element} element The element to get the id for.
         * @return {String} id
         */
        getId : function(element) {
            var id;

            element = Ext.getDom(element);

            if (element === doc || element === win) {
                id = element === doc ? Ext.documentId : Ext.windowId;
            }
            else {
                id = Ext.id(element);
            }

            if (!Ext.cache[id]) {
                Ext.addCacheEntry(id, null, element);
            }

            return id;
        },

        /**
         * Convert a "config style" listener into a set of flat arguments so they can be passed to addListener
         * @private
         * @param {Object} element The element the event is for
         * @param {Object} event The event configuration
         * @param {Object} isRemove True if a removal should be performed, otherwise an add will be done.
         */
        prepareListenerConfig: function(element, config, isRemove) {
            var propRe = EventManager.propRe,
                key, value, args;

            // loop over all the keys in the object
            for (key in config) {
                if (config.hasOwnProperty(key)) {
                    // if the key is something else then an event option
                    if (!propRe.test(key)) {
                        value = config[key];
                        // if the value is a function it must be something like click: function() {}, scope: this
                        // which means that there might be multiple event listeners with shared options
                        if (typeof value == 'function') {
                            // shared options
                            args = [element, key, value, config.scope, config];
                        } else {
                            // if its not a function, it must be an object like click: {fn: function() {}, scope: this}
                            args = [element, key, value.fn, value.scope, value];
                        }

                        if (isRemove) {
                            EventManager.removeListener.apply(EventManager, args);
                        } else {
                            EventManager.addListener.apply(EventManager, args);
                        }
                    }
                }
            }
        },

        mouseEnterLeaveRe: /mouseenter|mouseleave/,

        /**
         * Normalize cross browser event differences
         * @private
         * @param {Object} eventName The event name
         * @param {Object} fn The function to execute
         * @return {Object} The new event name/function
         */
        normalizeEvent: function(eventName, fn) {
            if (EventManager.mouseEnterLeaveRe.test(eventName) && !Ext.supports.MouseEnterLeave) {
                if (fn) {
                    fn = Ext.Function.createInterceptor(fn, EventManager.contains);
                }
                eventName = eventName == 'mouseenter' ? 'mouseover' : 'mouseout';
            } else if (eventName == 'mousewheel' && !Ext.supports.MouseWheel && !Ext.isOpera) {
                eventName = 'DOMMouseScroll';
            }
            return {
                eventName: eventName,
                fn: fn
            };
        },

        /**
         * Checks whether the event's relatedTarget is contained inside (or <b>is</b>) the element.
         * @private
         * @param {Object} event
         */
        contains: function(event) {
            var parent = event.browserEvent.currentTarget,
                child = EventManager.getRelatedTarget(event);

            if (parent && parent.firstChild) {
                while (child) {
                    if (child === parent) {
                        return false;
                    }
                    child = child.parentNode;
                    if (child && (child.nodeType != 1)) {
                        child = null;
                    }
                }
            }
            return true;
        },

        /**
        * Appends an event handler to an element.  The shorthand version {@link #on} is equivalent.  Typically you will
        * use {@link Ext.Element#addListener} directly on an Element in favor of calling this version.
        * @param {String/HTMLElement} el The html element or id to assign the event handler to.
        * @param {String} eventName The name of the event to listen for.
        * @param {Function} handler The handler function the event invokes. This function is passed
        * the following parameters:<ul>
        * <li>evt : EventObject<div class="sub-desc">The {@link Ext.EventObject EventObject} describing the event.</div></li>
        * <li>t : Element<div class="sub-desc">The {@link Ext.Element Element} which was the target of the event.
        * Note that this may be filtered by using the <tt>delegate</tt> option.</div></li>
        * <li>o : Object<div class="sub-desc">The options object from the addListener call.</div></li>
        * </ul>
        * @param {Object} scope (optional) The scope (<b><code>this</code></b> reference) in which the handler function is executed. <b>Defaults to the Element</b>.
        * @param {Object} options (optional) An object containing handler configuration properties.
        * This may contain any of the following properties:<ul>
        * <li>scope : Object<div class="sub-desc">The scope (<b><code>this</code></b> reference) in which the handler function is executed. <b>Defaults to the Element</b>.</div></li>
        * <li>delegate : String<div class="sub-desc">A simple selector to filter the target or look for a descendant of the target</div></li>
        * <li>stopEvent : Boolean<div class="sub-desc">True to stop the event. That is stop propagation, and prevent the default action.</div></li>
        * <li>preventDefault : Boolean<div class="sub-desc">True to prevent the default action</div></li>
        * <li>stopPropagation : Boolean<div class="sub-desc">True to prevent event propagation</div></li>
        * <li>normalized : Boolean<div class="sub-desc">False to pass a browser event to the handler function instead of an Ext.EventObject</div></li>
        * <li>delay : Number<div class="sub-desc">The number of milliseconds to delay the invocation of the handler after te event fires.</div></li>
        * <li>single : Boolean<div class="sub-desc">True to add a handler to handle just the next firing of the event, and then remove itself.</div></li>
        * <li>buffer : Number<div class="sub-desc">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 <em>not</em> invoked, but the new handler is scheduled in its place.</div></li>
        * <li>target : Element<div class="sub-desc">Only call the handler if the event was fired on the target Element, <i>not</i> if the event was bubbled up from a child node.</div></li>
        * </ul><br>
        * <p>See {@link Ext.Element#addListener} for examples of how to use these options.</p>
        */
        addListener: function(element, eventName, fn, scope, options) {
            // Check if we've been passed a "config style" event.
            if (typeof eventName !== 'string') {
                EventManager.prepareListenerConfig(element, eventName);
                return;
            }

            var dom = element.dom || Ext.getDom(element),
                bind, wrap;

            //<debug>
            if (!fn) {
                Ext.Error.raise({
                    sourceClass: 'Ext.EventManager',
                    sourceMethod: 'addListener',
                    targetElement: element,
                    eventName: eventName,
                    msg: 'Error adding "' + eventName + '\" listener. The handler function is undefined.'
                });
            }
            //</debug>

            // create the wrapper function
            options = options || {};

            bind = EventManager.normalizeEvent(eventName, fn);
            wrap = EventManager.createListenerWrap(dom, eventName, bind.fn, scope, options);

            if (dom.attachEvent) {
                dom.attachEvent('on' + bind.eventName, wrap);
            } else {
                dom.addEventListener(bind.eventName, wrap, options.capture || false);
            }

            if (dom == doc && eventName == 'mousedown') {
                EventManager.stoppedMouseDownEvent.addListener(wrap);
            }

            // add all required data into the event cache
            EventManager.getEventListenerCache(element.dom ? element : dom, eventName).push({
                fn: fn,
                wrap: wrap,
                scope: scope
            });
        },

        /**
        * Removes an event handler from an element.  The shorthand version {@link #un} is equivalent.  Typically
        * you will use {@link Ext.Element#removeListener} directly on an Element in favor of calling this version.
        * @param {String/HTMLElement} el The id or html element from which to remove the listener.
        * @param {String} eventName The name of the event.
        * @param {Function} fn The handler function to remove. <b>This must be a reference to the function passed into the {@link #addListener} call.</b>
        * @param {Object} scope If a scope (<b><code>this</code></b> reference) was specified when the listener was added,
        * then this must refer to the same object.
        */
        removeListener : function(element, eventName, fn, scope) {
            // handle our listener config object syntax
            if (typeof eventName !== 'string') {
                EventManager.prepareListenerConfig(element, eventName, true);
                return;
            }

            var dom = Ext.getDom(element),
                el = element.dom ? element : Ext.get(dom),
                cache = EventManager.getEventListenerCache(el, eventName),
                bindName = EventManager.normalizeEvent(eventName).eventName,
                i = cache.length, j,
                listener, wrap, tasks;


            while (i--) {
                listener = cache[i];

                if (listener && (!fn || listener.fn == fn) && (!scope || listener.scope === scope)) {
                    wrap = listener.wrap;

                    // clear buffered calls
                    if (wrap.task) {
                        clearTimeout(wrap.task);
                        delete wrap.task;
                    }

                    // clear delayed calls
                    j = wrap.tasks && wrap.tasks.length;
                    if (j) {
                        while (j--) {
                            clearTimeout(wrap.tasks[j]);
                        }
                        delete wrap.tasks;
                    }

                    if (dom.detachEvent) {
                        dom.detachEvent('on' + bindName, wrap);
                    } else {
                        dom.removeEventListener(bindName, wrap, false);
                    }

                    if (wrap && dom == doc && eventName == 'mousedown') {
                        EventManager.stoppedMouseDownEvent.removeListener(wrap);
                    }

                    // remove listener from cache
                    Ext.Array.erase(cache, i, 1);
                }
            }
        },

        /**
        * Removes all event handers from an element.  Typically you will use {@link Ext.Element#removeAllListeners}
        * directly on an Element in favor of calling this version.
        * @param {String/HTMLElement} el The id or html element from which to remove all event handlers.
        */
        removeAll : function(element) {
            var el = element.dom ? element : Ext.get(element),
                cache, events, eventName;

            if (!el) {
                return;
            }
            cache = (el.$cache || el.getCache());
            events = cache.events;

            for (eventName in events) {
                if (events.hasOwnProperty(eventName)) {
                    EventManager.removeListener(el, eventName);
                }
            }
            cache.events = {};
        },

        /**
         * Recursively removes all previous added listeners from an element and its children. Typically you will use {@link Ext.Element#purgeAllListeners}
         * directly on an Element in favor of calling this version.
         * @param {String/HTMLElement} el The id or html element from which to remove all event handlers.
         * @param {String} eventName (optional) The name of the event.
         */
        purgeElement : function(element, eventName) {
            var dom = Ext.getDom(element),
                i = 0, len;

            if (eventName) {
                EventManager.removeListener(element, eventName);
            }
            else {
                EventManager.removeAll(element);
            }

            if (dom && dom.childNodes) {
                for (len = element.childNodes.length; i < len; i++) {
                    EventManager.purgeElement(element.childNodes[i], eventName);
                }
            }
        },

        /**
         * Create the wrapper function for the event
         * @private
         * @param {HTMLElement} dom The dom element
         * @param {String} ename The event name
         * @param {Function} fn The function to execute
         * @param {Object} scope The scope to execute callback in
         * @param {Object} options The options
         * @return {Function} the wrapper function
         */
        createListenerWrap : function(dom, ename, fn, scope, options) {
            options = options || {};

            var f, gen, escapeRx = /\\/g, wrap = function(e, args) {
                // Compile the implementation upon first firing
                if (!gen) {
                    f = ['if(!' + Ext.name + ') {return;}'];

                    if(options.buffer || options.delay || options.freezeEvent) {
                        f.push('e = new X.EventObjectImpl(e, ' + (options.freezeEvent ? 'true' : 'false' ) + ');');
                    } else {
                        f.push('e = X.EventObject.setEvent(e);');
                    }

                    if (options.delegate) {
                        // double up '\' characters so escape sequences survive the
                        // string-literal translation
                        f.push('var result, t = e.getTarget("' + (options.delegate + '').replace(escapeRx, '\\\\') + '", this);');
                        f.push('if(!t) {return;}');
                    } else {
                        f.push('var t = e.target, result;');
                    }

                    if (options.target) {
                        f.push('if(e.target !== options.target) {return;}');
                    }

                    if(options.stopEvent) {
                        f.push('e.stopEvent();');
                    } else {
                        if(options.preventDefault) {
                            f.push('e.preventDefault();');
                        }
                        if(options.stopPropagation) {
                            f.push('e.stopPropagation();');
                        }
                    }

                    if(options.normalized === false) {
                        f.push('e = e.browserEvent;');
                    }

                    if(options.buffer) {
                        f.push('(wrap.task && clearTimeout(wrap.task));');
                        f.push('wrap.task = setTimeout(function() {');
                    }

                    if(options.delay) {
                        f.push('wrap.tasks = wrap.tasks || [];');
                        f.push('wrap.tasks.push(setTimeout(function() {');
                    }

                    // finally call the actual handler fn
                    f.push('result = fn.call(scope || dom, e, t, options);');

                    if(options.single) {
                        f.push('evtMgr.removeListener(dom, ename, fn, scope);');
                    }

                    // Fire the global idle event for all events except mousemove which is too common, and
                    // fires too frequently and fast to be use in tiggering onIdle processing.
                    if (ename !== 'mousemove') {
                        f.push('if (evtMgr.idleEvent.listeners.length) {');
                        f.push('evtMgr.idleEvent.fire();');
                        f.push('}');
                    }

                    if(options.delay) {
                        f.push('}, ' + options.delay + '));');
                    }

                    if(options.buffer) {
                        f.push('}, ' + options.buffer + ');');
                    }
                    f.push('return result;')

                    gen = Ext.cacheableFunctionFactory('e', 'options', 'fn', 'scope', 'ename', 'dom', 'wrap', 'args', 'X', 'evtMgr', f.join('\n'));
                }

                return gen.call(dom, e, options, fn, scope, ename, dom, wrap, args, Ext, EventManager);
            };
            return wrap;
        },

        /**
         * Get the event cache for a particular element for a particular event
         * @private
         * @param {HTMLElement} element The element
         * @param {Object} eventName The event name
         * @return {Array} The events for the element
         */
        getEventListenerCache : function(element, eventName) {
            var elementCache, eventCache;
            if (!element) {
                return [];
            }

            if (element.$cache) {
                elementCache = element.$cache;
            } else {
                // getId will populate the cache for this element if it isn't already present
                elementCache = Ext.cache[EventManager.getId(element)];
            }
            eventCache = elementCache.events || (elementCache.events = {});

            return eventCache[eventName] || (eventCache[eventName] = []);
        },

        // --------------------- utility methods ---------------------
        mouseLeaveRe: /(mouseout|mouseleave)/,
        mouseEnterRe: /(mouseover|mouseenter)/,

        /**
         * Stop the event (preventDefault and stopPropagation)
         * @param {Event} The event to stop
         */
        stopEvent: function(event) {
            EventManager.stopPropagation(event);
            EventManager.preventDefault(event);
        },

        /**
         * Cancels bubbling of the event.
         * @param {Event} The event to stop bubbling.
         */
        stopPropagation: function(event) {
            event = event.browserEvent || event;
            if (event.stopPropagation) {
                event.stopPropagation();
            } else {
                event.cancelBubble = true;
            }
        },

        /**
         * Prevents the browsers default handling of the event.
         * @param {Event} The event to prevent the default
         */
        preventDefault: function(event) {
            event = event.browserEvent || event;
            if (event.preventDefault) {
                event.preventDefault();
            } else {
                event.returnValue = false;
                // Some keys events require setting the keyCode to -1 to be prevented
                try {
                  // all ctrl + X and F1 -> F12
                  if (event.ctrlKey || event.keyCode > 111 && event.keyCode < 124) {
                      event.keyCode = -1;
                  }
                } catch (e) {
                    // see this outdated document http://support.microsoft.com/kb/934364/en-us for more info
                }
            }
        },

        /**
         * Gets the related target from the event.
         * @param {Object} event The event
         * @return {HTMLElement} The related target.
         */
        getRelatedTarget: function(event) {
            event = event.browserEvent || event;
            var target = event.relatedTarget;
            if (!target) {
                if (EventManager.mouseLeaveRe.test(event.type)) {
                    target = event.toElement;
                } else if (EventManager.mouseEnterRe.test(event.type)) {
                    target = event.fromElement;
                }
            }
            return EventManager.resolveTextNode(target);
        },

        /**
         * Gets the x coordinate from the event
         * @param {Object} event The event
         * @return {Number} The x coordinate
         */
        getPageX: function(event) {
            return EventManager.getPageXY(event)[0];
        },

        /**
         * Gets the y coordinate from the event
         * @param {Object} event The event
         * @return {Number} The y coordinate
         */
        getPageY: function(event) {
            return EventManager.getPageXY(event)[1];
        },

        /**
         * Gets the x & y coordinate from the event
         * @param {Object} event The event
         * @return {Number[]} The x/y coordinate
         */
        getPageXY: function(event) {
            event = event.browserEvent || event;
            var x = event.pageX,
                y = event.pageY,
                docEl = doc.documentElement,
                body = doc.body;

            // pageX/pageY not available (undefined, not null), use clientX/clientY instead
            if (!x && x !== 0) {
                x = event.clientX + (docEl && docEl.scrollLeft || body && body.scrollLeft || 0) - (docEl && docEl.clientLeft || body && body.clientLeft || 0);
                y = event.clientY + (docEl && docEl.scrollTop  || body && body.scrollTop  || 0) - (docEl && docEl.clientTop  || body && body.clientTop  || 0);
            }
            return [x, y];
        },

        /**
         * Gets the target of the event.
         * @param {Object} event The event
         * @return {HTMLElement} target
         */
        getTarget: function(event) {
            event = event.browserEvent || event;
            return EventManager.resolveTextNode(event.target || event.srcElement);
        },

        // technically no need to browser sniff this, however it makes
        // no sense to check this every time, for every event, whether
        // the string is equal.
        /**
         * Resolve any text nodes accounting for browser differences.
         * @private
         * @param {HTMLElement} node The node
         * @return {HTMLElement} The resolved node
         */
        resolveTextNode: Ext.isGecko ?
            function(node) {
                if (!node) {
                    return;
                }
                // work around firefox bug, https://bugzilla.mozilla.org/show_bug.cgi?id=101197
                var s = HTMLElement.prototype.toString.call(node);
                if (s == '[xpconnect wrapped native prototype]' || s == '[object XULElement]') {
                    return;
                }
                    return node.nodeType == 3 ? node.parentNode: node;
                }: function(node) {
                    return node && node.nodeType == 3 ? node.parentNode: node;
                },

        // --------------------- custom event binding ---------------------

        // Keep track of the current width/height
        curWidth: 0,
        curHeight: 0,

        /**
         * Adds a listener to be notified when the browser window is resized and provides resize event buffering (100 milliseconds),
         * passes new viewport width and height to handlers.
         * @param {Function} fn      The handler function the window resize event invokes.
         * @param {Object}   scope   The scope (<code>this</code> reference) in which the handler function executes. Defaults to the browser window.
         * @param {Boolean}  options Options object as passed to {@link Ext.Element#addListener}
         */
        onWindowResize: function(fn, scope, options) {
            var resize = EventManager.resizeEvent;

            if (!resize) {
                EventManager.resizeEvent = resize = new Ext.util.Event();
                EventManager.on(win, 'resize', EventManager.fireResize, null, {buffer: 100});
            }
            resize.addListener(fn, scope, options);
        },

        /**
         * Fire the resize event.
         * @private
         */
        fireResize: function() {
            var w = Ext.Element.getViewWidth(),
                h = Ext.Element.getViewHeight();

             //whacky problem in IE where the resize event will sometimes fire even though the w/h are the same.
             if (EventManager.curHeight != h || EventManager.curWidth != w) {
                 EventManager.curHeight = h;
                 EventManager.curWidth = w;
                 EventManager.resizeEvent.fire(w, h);
             }
        },

        /**
         * Removes the passed window resize listener.
         * @param {Function} fn        The method the event invokes
         * @param {Object}   scope    The scope of handler
         */
        removeResizeListener: function(fn, scope) {
            var resize = EventManager.resizeEvent;
            if (resize) {
                resize.removeListener(fn, scope);
            }
        },

        /**
         * Adds a listener to be notified when the browser window is unloaded.
         * @param {Function} fn      The handler function the window unload event invokes.
         * @param {Object}   scope   The scope (<code>this</code> reference) in which the handler function executes. Defaults to the browser window.
         * @param {Boolean}  options Options object as passed to {@link Ext.Element#addListener}
         */
        onWindowUnload: function(fn, scope, options) {
            var unload = EventManager.unloadEvent;

            if (!unload) {
                EventManager.unloadEvent = unload = new Ext.util.Event();
                EventManager.addListener(win, 'unload', EventManager.fireUnload);
            }
            if (fn) {
                unload.addListener(fn, scope, options);
            }
        },

        /**
         * Fires the unload event for items bound with onWindowUnload
         * @private
         */
        fireUnload: function() {
            // wrap in a try catch, could have some problems during unload
            try {
                // relinquish references.
                doc = win = undefined;

                var gridviews, i, ln,
                    el, cache;

                EventManager.unloadEvent.fire();
                // Work around FF3 remembering the last scroll position when refreshing the grid and then losing grid view
                if (Ext.isGecko3) {
                    gridviews = Ext.ComponentQuery.query('gridview');
                    i = 0;
                    ln = gridviews.length;
                    for (; i < ln; i++) {
                        gridviews[i].scrollToTop();
                    }
                }
                // Purge all elements in the cache
                cache = Ext.cache;

                for (el in cache) {
                    if (cache.hasOwnProperty(el)) {
                        EventManager.removeAll(el);
                    }
                }
            } catch(e) {
            }
        },

        /**
         * Removes the passed window unload listener.
         * @param {Function} fn        The method the event invokes
         * @param {Object}   scope    The scope of handler
         */
        removeUnloadListener: function(fn, scope) {
            var unload = EventManager.unloadEvent;
            if (unload) {
                unload.removeListener(fn, scope);
            }
        },

        /**
         * note 1: IE fires ONLY the keydown event on specialkey autorepeat
         * note 2: Safari < 3.1, Gecko (Mac/Linux) & Opera fire only the keypress event on specialkey autorepeat
         * (research done by Jan Wolter at http://unixpapa.com/js/key.html)
         * @private
         */
        useKeyDown: Ext.isWebKit ?
                       parseInt(navigator.userAgent.match(/AppleWebKit\/(\d+)/)[1], 10) >= 525 :
                       !((Ext.isGecko && !Ext.isWindows) || Ext.isOpera),

        /**
         * Indicates which event to use for getting key presses.
         * @return {String} The appropriate event name.
         */
        getKeyEvent: function() {
            return EventManager.useKeyDown ? 'keydown' : 'keypress';
        }
    });

    // route "< ie9-Standards" to a legacy IE onReady implementation
    if(!('addEventListener' in document) && document.attachEvent) {
        Ext.apply( EventManager, {
            /* Customized implementation for Legacy IE.  The default implementation is configured for use
             *  with all other 'standards compliant' agents.
             *  References: http://javascript.nwbox.com/IEContentLoaded/
             *  licensed courtesy of http://developer.yahoo.com/yui/license.html
             */

            /**
             * This strategy has minimal benefits for Sencha solutions that build themselves (ie. minimal initial page markup).
             * However, progressively-enhanced pages (with image content and/or embedded frames) will benefit the most from it.
             * Browser timer resolution is too poor to ensure a doScroll check more than once on a page loaded with minimal
             * assets (the readystatechange event 'complete' usually beats the doScroll timer on a 'lightly-loaded' initial document).
             */
            pollScroll : function() {
                var scrollable = true;

                try {
                    document.documentElement.doScroll('left');
                } catch(e) {
                    scrollable = false;
                }

                // on IE8, when running within an iFrame, document.body is not immediately available
                if (scrollable && document.body) {
                    EventManager.onReadyEvent({
                        type:'doScroll'
                    });
                } else {
                    /*
                     * minimize thrashing --
                     * adjusted for setTimeout's close-to-minimums (not too low),
                     * as this method SHOULD always be called once initially
                     */
                    EventManager.scrollTimeout = setTimeout(EventManager.pollScroll, 20);
                }

                return scrollable;
            },

            /**
             * Timer for doScroll polling
             * @private
             */
            scrollTimeout: null,

            /* @private
             */
            readyStatesRe  : /complete/i,

            /* @private
             */
            checkReadyState: function() {
                var state = document.readyState;

                if (EventManager.readyStatesRe.test(state)) {
                    EventManager.onReadyEvent({
                        type: state
                    });
                }
            },

            bindReadyEvent: function() {
                var topContext = true;

                if (EventManager.hasBoundOnReady) {
                    return;
                }

                //are we in an IFRAME? (doScroll ineffective here)
                try {
                    topContext = window.frameElement === undefined;
                } catch(e) {
                    // If we throw an exception, it means we're probably getting access denied,
                    // which means we're in an iframe cross domain.
                    topContext = false;
                }

                if (!topContext || !doc.documentElement.doScroll) {
                    EventManager.pollScroll = Ext.emptyFn;   //then noop this test altogether
                }

                // starts doScroll polling if necessary
                if (EventManager.pollScroll() === true) {
                    return;
                }

                // Core is loaded AFTER initial document write/load ?
                if (doc.readyState == 'complete' )  {
                    EventManager.onReadyEvent({type: 'already ' + (doc.readyState || 'body') });
                } else {
                    doc.attachEvent('onreadystatechange', EventManager.checkReadyState);
                    window.attachEvent('onload', EventManager.onReadyEvent);
                    EventManager.hasBoundOnReady = true;
                }
            },

            onReadyEvent : function(e) {
                if (e && e.type) {
                    EventManager.onReadyChain.push(e.type);
                }

                if (EventManager.hasBoundOnReady) {
                    document.detachEvent('onreadystatechange', EventManager.checkReadyState);
                    window.detachEvent('onload', EventManager.onReadyEvent);
                }

                if (Ext.isNumber(EventManager.scrollTimeout)) {
                    clearTimeout(EventManager.scrollTimeout);
                    delete EventManager.scrollTimeout;
                }

                if (!Ext.isReady) {
                    EventManager.fireDocReady();
                }
            },

            //diags: a list of event types passed to onReadyEvent (in chron order)
            onReadyChain : []
        });
    }


    /**
     * Alias for {@link Ext.Loader#onReady Ext.Loader.onReady} with withDomReady set to true
     * @member Ext
     * @method onReady
     */
    Ext.onReady = function(fn, scope, options) {
        Ext.Loader.onReady(fn, scope, true, options);
    };

    /**
     * Alias for {@link Ext.EventManager#onDocumentReady Ext.EventManager.onDocumentReady}
     * @member Ext
     * @method onDocumentReady
     */
    Ext.onDocumentReady = EventManager.onDocumentReady;

    /**
     * Alias for {@link Ext.EventManager#addListener Ext.EventManager.addListener}
     * @member Ext.EventManager
     * @method on
     */
    EventManager.on = EventManager.addListener;

    /**
     * Alias for {@link Ext.EventManager#removeListener Ext.EventManager.removeListener}
     * @member Ext.EventManager
     * @method un
     */
    EventManager.un = EventManager.removeListener;

    Ext.onReady(initExtCss);
};
