    /**
     * @class Ext.util.KeyNav
     * <p>Provides a convenient wrapper for normalized keyboard navigation.  KeyNav allows you to bind
     * navigation keys to function calls that will get called when the keys are pressed, providing an easy
     * way to implement custom navigation schemes for any UI component.</p>
     * <p>The following are all of the possible keys that can be implemented: enter, space, left, right, up, down, tab, esc,
     * pageUp, pageDown, del, backspace, home, end.  Usage:</p>
     <pre><code>
    var nav = new Ext.util.KeyNav("my-element", {
        "left" : function(e){
            this.moveLeft(e.ctrlKey);
        },
        "right" : function(e){
            this.moveRight(e.ctrlKey);
        },
        "enter" : function(e){
            this.save();
        },
        scope : this
    });
    </code></pre>
     */
    Ext.define('Ext.util.KeyNav', {

        alternateClassName: 'Ext.KeyNav',

        requires: ['Ext.util.KeyMap'],

        statics: {
            keyOptions: {
                left: 37,
                right: 39,
                up: 38,
                down: 40,
                space: 32,
                pageUp: 33,
                pageDown: 34,
                del: 46,
                backspace: 8,
                home: 36,
                end: 35,
                enter: 13,
                esc: 27,
                tab: 9
            }
        },

        /**
         * Creates new KeyNav.
         * @param {Mixed} el The element to bind to
         * @param {Object} config The config
         */
        constructor: function(el, config){
            this.setConfig(el, config || {});
        },

        /**
         * Sets up a configuration for the KeyNav.
         * @private
         * @param {Mixed} el The element to bind to
         * @param {Object}A configuration object as specified in the constructor.
         */
        setConfig: function(el, config) {
            if (this.map) {
                this.map.destroy();
            }

            var map = Ext.create('Ext.util.KeyMap', el, null, this.getKeyEvent('forceKeyDown' in config ? config.forceKeyDown : this.forceKeyDown)),
                keys = Ext.util.KeyNav.keyOptions,
                scope = config.scope || this,
                key;

            this.map = map;
            for (key in keys) {
                if (keys.hasOwnProperty(key)) {
                    if (config[key]) {
                        map.addBinding({
                            scope: scope,
                            key: keys[key],
                            handler: Ext.Function.bind(this.handleEvent, scope, [config[key]], true),
                            defaultEventAction: config.defaultEventAction || this.defaultEventAction
                        });
                    }
                }
            }

            map.disable();
            if (!config.disabled) {
                map.enable();
            }
        },

        /**
         * Method for filtering out the map argument
         * @private
         * @param {Ext.util.KeyMap} map
         * @param {Ext.EventObject} event
         * @param {Object} options Contains the handler to call
         */
        handleEvent: function(map, event, handler){
            return handler.call(this, event);
        },

        /**
         * @cfg {Boolean} disabled
         * True to disable this KeyNav instance (defaults to false)
         */
        disabled: false,

        /**
         * @cfg {String} defaultEventAction
         * The method to call on the {@link Ext.EventObject} after this KeyNav intercepts a key.  Valid values are
         * {@link Ext.EventObject#stopEvent}, {@link Ext.EventObject#preventDefault} and
         * {@link Ext.EventObject#stopPropagation} (defaults to 'stopEvent')
         */
        defaultEventAction: "stopEvent",

        /**
         * @cfg {Boolean} forceKeyDown
         * Handle the keydown event instead of keypress (defaults to false).  KeyNav automatically does this for IE since
         * IE does not propagate special keys on keypress, but setting this to true will force other browsers to also
         * handle keydown instead of keypress.
         */
        forceKeyDown: false,

        /**
         * Destroy this KeyNav (this is the same as calling disable).
         * @param {Boolean} removeEl True to remove the element associated with this KeyNav.
         */
        destroy: function(removeEl){
            this.map.destroy(removeEl);
            delete this.map;
        },

        /**
         * Enable this KeyNav
         */
        enable: function() {
            this.map.enable();
            this.disabled = false;
        },

        /**
         * Disable this KeyNav
         */
        disable: function() {
            this.map.disable();
            this.disabled = true;
        },

        /**
         * Convenience function for setting disabled/enabled by boolean.
         * @param {Boolean} disabled
         */
        setDisabled : function(disabled){
            this.map.setDisabled(disabled);
            this.disabled = disabled;
        },

        /**
         * Determines the event to bind to listen for keys. Depends on the {@link #forceKeyDown} setting,
         * as well as the useKeyDown option on the EventManager.
         * @return {String} The type of event to listen for.
         */
        getKeyEvent: function(forceKeyDown){
            return (forceKeyDown || Ext.EventManager.useKeyDown) ? 'keydown' : 'keypress';
        }
    });