    /**
     * @class Ext.form.field.ComboBox
     * @extends Ext.form.field.Picker
     *
     * A combobox control with support for autocomplete, remote loading, and many other features.
     *
     * A ComboBox is like a combination of a traditional HTML text `&lt;input&gt;` field and a `&lt;select&gt;`
     * field; the user is able to type freely into the field, and/or pick values from a dropdown selection
     * list. The user can input any value by default, even if it does not appear in the selection list;
     * to prevent free-form values and restrict them to items in the list, set {@link #forceSelection} to `true`.
     *
     * The selection list's options are populated from any {@link Ext.data.Store}, including remote
     * stores. The data items in the store are mapped to each option's displayed text and backing value via
     * the {@link #valueField} and {@link #displayField} configurations, respectively.
     *
     * If your store is not remote, i.e. it depends only on local data and is loaded up front, you should be
     * sure to set the {@link #queryMode} to `'local'`, as this will improve responsiveness for the user.
     *
     * {@img Ext.form.ComboBox/Ext.form.ComboBox.png Ext.form.ComboBox component}
     *
     * ## Example usage:
     *
     *     // The data store containing the list of states
     *     var states = Ext.create('Ext.data.Store', {
     *         fields: ['abbr', 'name'],
     *         data : [
     *             {"abbr":"AL", "name":"Alabama"},
     *             {"abbr":"AK", "name":"Alaska"},
     *             {"abbr":"AZ", "name":"Arizona"}
     *             //...
     *         ]
     *     });
     *
     *     // Create the combo box, attached to the states data store
     *     Ext.create('Ext.form.ComboBox', {
     *         fieldLabel: 'Choose State',
     *         store: states,
     *         queryMode: 'local',
     *         displayField: 'name',
     *         valueField: 'abbr',
     *         renderTo: Ext.getBody()
     *     });
     *
     * ## Events
     *
     * To do something when something in ComboBox is selected, configure the select event:
     *
     *     var cb = Ext.create('Ext.form.ComboBox', {
     *         // all of your config options
     *         listeners:{
     *              scope: yourScope,
     *              'select': yourFunction
     *         }
     *     });
     *
     *     // Alternatively, you can assign events after the object is created:
     *     var cb = new Ext.form.field.ComboBox(yourOptions);
     *     cb.on('select', yourFunction, yourScope);
     *
     * ## Multiple Selection
     *
     * ComboBox also allows selection of multiple items from the list; to enable multi-selection set the
     * {@link #multiSelect} config to `true`.
     *
     * @constructor
     * Create a new ComboBox.
     * @param {Object} config Configuration options
     * @xtype combo
     * @docauthor Jason Johnston <jason@sencha.com>
     */
    Ext.define('Ext.form.field.ComboBox', {
        extend:'Ext.form.field.Picker',
        requires: ['Ext.util.DelayedTask', 'Ext.EventObject', 'Ext.view.BoundList', 'Ext.view.BoundListKeyNav', 'Ext.data.StoreManager'],
        alternateClassName: 'Ext.form.ComboBox',
        alias: ['widget.combobox', 'widget.combo'],

        /**
         * @cfg {String} triggerCls
         * An additional CSS class used to style the trigger button. The trigger will always get the
         * {@link #triggerBaseCls} by default and <tt>triggerCls</tt> will be <b>appended</b> if specified.
         * Defaults to 'x-form-arrow-trigger' for ComboBox.
         */
        triggerCls: Ext.baseCSSPrefix + 'form-arrow-trigger',

        /**
         * @cfg {Ext.data.Store/Array} store The data source to which this combo is bound (defaults to <tt>undefined</tt>).
         * Acceptable values for this property are:
         * <div class="mdetail-params"><ul>
         * <li><b>any {@link Ext.data.Store Store} subclass</b></li>
         * <li><b>an Array</b> : Arrays will be converted to a {@link Ext.data.Store} internally,
         * automatically generating {@link Ext.data.Field#name field names} to work with all data components.
         * <div class="mdetail-params"><ul>
         * <li><b>1-dimensional array</b> : (e.g., <tt>['Foo','Bar']</tt>)<div class="sub-desc">
         * A 1-dimensional array will automatically be expanded (each array item will be used for both the combo
         * {@link #valueField} and {@link #displayField})</div></li>
         * <li><b>2-dimensional array</b> : (e.g., <tt>[['f','Foo'],['b','Bar']]</tt>)<div class="sub-desc">
         * For a multi-dimensional array, the value in index 0 of each item will be assumed to be the combo
         * {@link #valueField}, while the value at index 1 is assumed to be the combo {@link #displayField}.
         * </div></li></ul></div></li></ul></div>
         * <p>See also <tt>{@link #queryMode}</tt>.</p>
         */

        /**
         * @cfg {Boolean} multiSelect
         * If set to <tt>true</tt>, allows the combo field to hold more than one value at a time, and allows selecting
         * multiple items from the dropdown list. The combo's text field will show all selected values separated by
         * the {@link #delimiter}. (Defaults to <tt>false</tt>.)
         */
        multiSelect: false,

        /**
         * @cfg {String} delimiter
         * The character(s) used to separate the {@link #displayField display values} of multiple selected items
         * when <tt>{@link #multiSelect} = true</tt>. Defaults to <tt>', '</tt>.
         */
        delimiter: ', ',

        /**
         * @cfg {String} displayField The underlying {@link Ext.data.Field#name data field name} to bind to this
         * ComboBox (defaults to 'text').
         * <p>See also <tt>{@link #valueField}</tt>.</p>
         */
        displayField: 'text',

        /**
         * @cfg {String} valueField
         * @required
         * The underlying {@link Ext.data.Field#name data value name} to bind to this ComboBox (defaults to match
         * the value of the {@link #displayField} config).
         * <p><b>Note</b>: use of a <tt>valueField</tt> requires the user to make a selection in order for a value to be
         * mapped. See also <tt>{@link #displayField}</tt>.</p>
         */

        /**
         * @cfg {String} triggerAction The action to execute when the trigger is clicked.
         * <div class="mdetail-params"><ul>
         * <li><b><tt>'all'</tt></b> : <b>Default</b>
         * <p class="sub-desc">{@link #doQuery run the query} specified by the <tt>{@link #allQuery}</tt> config option</p></li>
         * <li><b><tt>'query'</tt></b> :
         * <p class="sub-desc">{@link #doQuery run the query} using the {@link Ext.form.field.Base#getRawValue raw value}.</p></li>
         * </ul></div>
         * <p>See also <code>{@link #queryParam}</code>.</p>
         */
        triggerAction: 'all',

        /**
         * @cfg {String} allQuery The text query to send to the server to return all records for the list
         * with no filtering (defaults to '')
         */
        allQuery: '',

        /**
         * @cfg {String} queryParam Name of the query ({@link Ext.data.Store#baseParam baseParam} name for the store)
         * as it will be passed on the querystring (defaults to <tt>'query'</tt>)
         */
        queryParam: 'query',

        /**
         * @cfg {String} queryMode
         * The mode for queries. Acceptable values are:
         * <div class="mdetail-params"><ul>
         * <li><b><tt>'remote'</tt></b> : <b>Default</b>
         * <p class="sub-desc">Automatically loads the <tt>{@link #store}</tt> the <b>first</b> time the trigger
         * is clicked. If you do not want the store to be automatically loaded the first time the trigger is
         * clicked, set to <tt>'local'</tt> and manually load the store.  To force a requery of the store
         * <b>every</b> time the trigger is clicked see <tt>{@link #lastQuery}</tt>.</p></li>
         * <li><b><tt>'local'</tt></b> :
         * <p class="sub-desc">ComboBox loads local data</p>
         * <pre><code>
    var combo = new Ext.form.field.ComboBox({
        renderTo: document.body,
        queryMode: 'local',
        store: new Ext.data.ArrayStore({
            id: 0,
            fields: [
                'myId',  // numeric value is the key
                'displayText'
            ],
            data: [[1, 'item1'], [2, 'item2']]  // data is local
        }),
        valueField: 'myId',
        displayField: 'displayText',
        triggerAction: 'all'
    });
         * </code></pre></li>
         * </ul></div>
         */
        queryMode: 'remote',

        queryCaching: true,

        /**
         * @cfg {Number} pageSize If greater than <tt>0</tt>, a {@link Ext.toolbar.Paging} is displayed in the
         * footer of the dropdown list and the {@link #doQuery filter queries} will execute with page start and
         * {@link Ext.toolbar.Paging#pageSize limit} parameters. Only applies when <tt>{@link #queryMode} = 'remote'</tt>
         * (defaults to <tt>0</tt>).
         */
        pageSize: 0,

        /**
         * @cfg {Number} queryDelay The length of time in milliseconds to delay between the start of typing and
         * sending the query to filter the dropdown list (defaults to <tt>500</tt> if <tt>{@link #queryMode} = 'remote'</tt>
         * or <tt>10</tt> if <tt>{@link #queryMode} = 'local'</tt>)
         */

        /**
         * @cfg {Number} minChars The minimum number of characters the user must type before autocomplete and
         * {@link #typeAhead} activate (defaults to <tt>4</tt> if <tt>{@link #queryMode} = 'remote'</tt> or <tt>0</tt> if
         * <tt>{@link #queryMode} = 'local'</tt>, does not apply if <tt>{@link Ext.form.field.Trigger#editable editable} = false</tt>).
         */

        /**
         * @cfg {Boolean} autoSelect <tt>true</tt> to select the first result gathered by the data store (defaults
         * to <tt>true</tt>).  A false value would require a manual selection from the dropdown list to set the components value
         * unless the value of ({@link #typeAhead}) were true.
         */
        autoSelect: true,

        /**
         * @cfg {Boolean} typeAhead <tt>true</tt> to populate and autoselect the remainder of the text being
         * typed after a configurable delay ({@link #typeAheadDelay}) if it matches a known value (defaults
         * to <tt>false</tt>)
         */
        typeAhead: false,

        /**
         * @cfg {Number} typeAheadDelay The length of time in milliseconds to wait until the typeahead text is displayed
         * if <tt>{@link #typeAhead} = true</tt> (defaults to <tt>250</tt>)
         */
        typeAheadDelay: 250,

        /**
         * @cfg {Boolean} selectOnTab
         * Whether the Tab key should select the currently highlighted item. Defaults to <tt>true</tt>.
         */
        selectOnTab: true,

        /**
         * @cfg {Boolean} forceSelection <tt>true</tt> to restrict the selected value to one of the values in the list,
         * <tt>false</tt> to allow the user to set arbitrary text into the field (defaults to <tt>false</tt>)
         */
        forceSelection: false,

        /**
         * @cfg {String} valueNotFoundText When using a name/value combo, if the value passed to setValue is not found in
         * the store, valueNotFoundText will be displayed as the field text if defined (defaults to undefined). If this
         * default text is used, it means there is no value set and no validation will occur on this field.
         */

        /**
         * The value of the match string used to filter the store. Delete this property to force a requery.
         * Example use:
         * <pre><code>
    var combo = new Ext.form.field.ComboBox({
        ...
        queryMode: 'remote',
        listeners: {
            // delete the previous query in the beforequery event or set
            // combo.lastQuery = null (this will reload the store the next time it expands)
            beforequery: function(qe){
                delete qe.combo.lastQuery;
            }
        }
    });
         * </code></pre>
         * To make sure the filter in the store is not cleared the first time the ComboBox trigger is used
         * configure the combo with <tt>lastQuery=''</tt>. Example use:
         * <pre><code>
    var combo = new Ext.form.field.ComboBox({
        ...
        queryMode: 'local',
        triggerAction: 'all',
        lastQuery: ''
    });
         * </code></pre>
         * @property lastQuery
         * @type String
         */

        /**
         * @cfg {Object} defaultListConfig
         * Set of options that will be used as defaults for the user-configured {@link #listConfig} object.
         */
        defaultListConfig: {
            emptyText: '',
            loadingText: 'Loading...',
            loadingHeight: 70,
            minWidth: 70,
            maxHeight: 300,
            shadow: 'sides'
        },

        /**
         * @cfg {Mixed} transform
         * The id, DOM node or {@link Ext.core.Element} of an existing HTML <tt>&lt;select&gt;</tt> element to
         * convert into a ComboBox. The target select's options will be used to build the options in the ComboBox
         * dropdown; a configured {@link #store} will take precedence over this.
         */

        /**
         * @cfg {Object} listConfig
         * <p>An optional set of configuration properties that will be passed to the {@link Ext.view.BoundList}'s
         * constructor. Any configuration that is valid for BoundList can be included. Some of the more useful
         * ones are:</p>
         * <ul>
         *     <li>{@link Ext.view.BoundList#cls} - defaults to empty</li>
         *     <li>{@link Ext.view.BoundList#emptyText} - defaults to empty string</li>
         *     <li>{@link Ext.view.BoundList#getInnerTpl} - defaults to the template defined in BoundList</li>
         *     <li>{@link Ext.view.BoundList#itemSelector} - defaults to the value defined in BoundList</li>
         *     <li>{@link Ext.view.BoundList#loadingText} - defaults to <tt>'Loading...'</tt></li>
         *     <li>{@link Ext.view.BoundList#minWidth} - defaults to <tt>70</tt></li>
         *     <li>{@link Ext.view.BoundList#maxWidth} - defaults to <tt>undefined</tt></li>
         *     <li>{@link Ext.view.BoundList#maxHeight} - defaults to <tt>300</tt></li>
         *     <li>{@link Ext.view.BoundList#resizable} - defaults to <tt>false</tt></li>
         *     <li>{@link Ext.view.BoundList#shadow} - defaults to <tt>'sides'</tt></li>
         *     <li>{@link Ext.view.BoundList#width} - defaults to <tt>undefined</tt> (automatically set to the width
         *         of the ComboBox field if {@link #matchFieldWidth} is true)</li>
         * </ul>
         */

        //private
        ignoreSelection: 0,

        initComponent: function() {
            var me = this,
                isDefined = Ext.isDefined,
                store = me.store,
                transform = me.transform,
                transformSelect, isLocalMode;

            //<debug>
            if (!store && !transform) {
                Ext.Error.raise('Either a valid store, or a HTML select to transform, must be configured on the combo.');
            }
            if (me.typeAhead && me.multiSelect) {
                Ext.Error.raise('typeAhead and multiSelect are mutually exclusive options -- please remove one of them.');
            }
            if (me.typeAhead && !me.editable) {
                Ext.Error.raise('If typeAhead is enabled the combo must be editable: true -- please change one of those settings.');
            }
            if (me.selectOnFocus && !me.editable) {
                Ext.Error.raise('If selectOnFocus is enabled the combo must be editable: true -- please change one of those settings.');
            }
            //</debug>

            this.addEvents(
                // TODO need beforeselect?

                /**
                 * @event beforequery
                 * Fires before all queries are processed. Return false to cancel the query or set the queryEvent's
                 * cancel property to true.
                 * @param {Object} queryEvent An object that has these properties:<ul>
                 * <li><code>combo</code> : Ext.form.field.ComboBox <div class="sub-desc">This combo box</div></li>
                 * <li><code>query</code> : String <div class="sub-desc">The query string</div></li>
                 * <li><code>forceAll</code> : Boolean <div class="sub-desc">True to force "all" query</div></li>
                 * <li><code>cancel</code> : Boolean <div class="sub-desc">Set to true to cancel the query</div></li>
                 * </ul>
                 */
                'beforequery',

                /*
                 * @event select
                 * Fires when at least one list item is selected.
                 * @param {Ext.form.field.ComboBox} combo This combo box
                 * @param {Array} records The selected records
                 */
                'select'
            );

            // Build store from 'transform' HTML select element's options
            if (!store && transform) {
                transformSelect = Ext.getDom(transform);
                if (transformSelect) {
                    store = Ext.Array.map(Ext.Array.from(transformSelect.options), function(option) {
                        return [option.value, option.text];
                    });
                    if (!me.name) {
                        me.name = transformSelect.name;
                    }
                    if (!('value' in me)) {
                        me.value = transformSelect.value;
                    }
                }
            }

            me.bindStore(store, true);
            store = me.store;
            if (store.autoCreated) {
                me.queryMode = 'local';
                me.valueField = me.displayField = 'field1';
                if (!store.expanded) {
                    me.displayField = 'field2';
                }
            }

            if (!isDefined(me.valueField)) {
                me.valueField = me.displayField;
            }

            isLocalMode = me.queryMode === 'local';
            if (!isDefined(me.queryDelay)) {
                me.queryDelay = isLocalMode ? 10 : 500;
            }
            if (!isDefined(me.minChars)) {
                me.minChars = isLocalMode ? 0 : 4;
            }

            if (!me.displayTpl) {
                me.displayTpl = Ext.create('Ext.XTemplate',
                    '<tpl for=".">' +
                        '{[typeof values === "string" ? values : values.' + me.displayField + ']}' +
                        '<tpl if="xindex < xcount">' + me.delimiter + '</tpl>' +
                    '</tpl>'
                );
            } else if (Ext.isString(me.displayTpl)) {
                me.displayTpl = Ext.create('Ext.XTemplate', me.displayTpl);
            }

            me.callParent();

            me.doQueryTask = Ext.create('Ext.util.DelayedTask', me.doRawQuery, me);

            // store has already been loaded, setValue
            if (me.store.getCount() > 0) {
                me.setValue(me.value);
            }

            // render in place of 'transform' select
            if (transformSelect) {
                me.render(transformSelect.parentNode, transformSelect);
                Ext.removeNode(transformSelect);
                delete me.renderTo;
            }
        },

        beforeBlur: function() {
            var me = this;
            me.doQueryTask.cancel();
            if (me.forceSelection) {
                me.assertValue();
            } else {
                me.collapse();
            }
        },

        // private
        assertValue: function() {
            var me = this,
                value = me.getRawValue(),
                rec;

            if (me.multiSelect) {
                // For multiselect, check that the current displayed value matches the current
                // selection, if it does not then revert to the most recent selection.
                if (value !== me.getDisplayValue()) {
                    me.setValue(me.lastSelection);
                }
            } else {
                // For single-select, match the displayed value to a record and select it,
                // if it does not match a record then revert to the most recent selection.
                rec = me.findRecordByDisplay(value);
                if (rec) {
                    me.select(rec);
                } else {
                    me.setValue(me.lastSelection);
                }
            }
            me.collapse();
        },

        onTypeAhead: function() {
            var me = this,
                displayField = me.displayField,
                record = me.store.findRecord(displayField, me.getRawValue()),
                boundList = me.getPicker(),
                newValue, len, selStart;

            if (record) {
                newValue = record.get(displayField);
                len = newValue.length;
                selStart = me.getRawValue().length;

                boundList.highlightItem(boundList.getNode(record));

                if (selStart !== 0 && selStart !== len) {
                    me.setRawValue(newValue);
                    me.selectText(selStart, newValue.length);
                }
            }
        },

        // invoked when a different store is bound to this combo
        // than the original
        resetToDefault: function() {

        },

        bindStore: function(store, initial) {
            var me = this,
                oldStore = me.store;

            // this code directly accesses this.picker, bc invoking getPicker
            // would create it when we may be preping to destroy it
            if (oldStore && !initial) {
                if (oldStore !== store && oldStore.autoDestroy) {
                    oldStore.destroy();
                } else {
                    oldStore.un({
                        scope: me,
                        load: me.onLoad,
                        exception: me.collapse
                    });
                }
                if (!store) {
                    me.store = null;
                    if (me.picker) {
                        me.picker.bindStore(null);
                    }
                }
            }
            if (store) {
                if (!initial) {
                    me.resetToDefault();
                }

                me.store = Ext.data.StoreManager.lookup(store);
                me.store.on({
                    scope: me,
                    load: me.onLoad,
                    exception: me.collapse
                });

                if (me.picker) {
                    me.picker.bindStore(store);
                }
            }
        },

        onLoad: function() {
            var me = this,
                value = me.value;

            me.syncSelection();
            if (me.picker && !me.picker.getSelectionModel().hasSelection()) {
                me.doAutoSelect();
            }
        },

        /**
         * @private
         * Execute the query with the raw contents within the textfield.
         */
        doRawQuery: function() {
            this.doQuery(this.getRawValue());
        },

        /**
         * Executes a query to filter the dropdown list. Fires the {@link #beforequery} event prior to performing the
         * query allowing the query action to be canceled if needed.
         * @param {String} queryString The SQL query to execute
         * @param {Boolean} forceAll <tt>true</tt> to force the query to execute even if there are currently fewer
         * characters in the field than the minimum specified by the <tt>{@link #minChars}</tt> config option.  It
         * also clears any filter previously saved in the current store (defaults to <tt>false</tt>)
         * @return {Boolean} true if the query was permitted to run, false if it was cancelled by a {@link #beforequery} handler.
         */
        doQuery: function(queryString, forceAll) {
            queryString = queryString || '';

            // store in object and pass by reference in 'beforequery'
            // so that client code can modify values.
            var me = this,
                qe = {
                    query: queryString,
                    forceAll: forceAll,
                    combo: me,
                    cancel: false
                },
                store = me.store,
                isLocalMode = me.queryMode === 'local';

            if (me.fireEvent('beforequery', qe) === false || qe.cancel) {
                return false;
            }

            // get back out possibly modified values
            queryString = qe.query;
            forceAll = qe.forceAll;

            // query permitted to run
            if (forceAll || (queryString.length >= me.minChars)) {
                // expand before starting query so LoadMask can position itself correctly
                me.expand();

                // make sure they aren't querying the same thing
                if (!me.queryCaching || me.lastQuery !== queryString) {
                    me.lastQuery = queryString;
                    store.clearFilter(!forceAll);
                    if (isLocalMode) {
                        if (!forceAll) {
                            store.filter(me.displayField, queryString);
                        }
                    } else {
                        store.load({
                            params: me.getParams(queryString)
                        });
                    }
                }

                // Clear current selection if it does not match the current value in the field
                if (me.getRawValue() !== me.getDisplayValue()) {
                    me.ignoreSelection++;
                    me.picker.getSelectionModel().deselectAll();
                    me.ignoreSelection--;
                }

                if (isLocalMode) {
                    me.doAutoSelect();
                }
                if (me.typeAhead) {
                    me.doTypeAhead();
                }
            }
            return true;
        },

        // private
        getParams: function(queryString) {
            var p = {},
                pageSize = this.pageSize;
            p[this.queryParam] = queryString;
            if (pageSize) {
                p.start = 0;
                p.limit = pageSize;
            }
            return p;
        },

        /**
         * @private
         * If the autoSelect config is true, and the picker is open, highlights the first item.
         */
        doAutoSelect: function() {
            var me = this,
                picker = me.picker,
                lastSelected, itemNode;
            if (picker && me.autoSelect && me.store.getCount() > 0) {
                // Highlight the last selected item and scroll it into view
                lastSelected = picker.getSelectionModel().lastSelected;
                itemNode = picker.getNode(lastSelected || 0);
                if (itemNode) {
                    picker.highlightItem(itemNode);
                    picker.listEl.scrollChildIntoView(itemNode, false);
                }
            }
        },

        doTypeAhead: function() {
            if (!this.typeAheadTask) {
                this.typeAheadTask = Ext.create('Ext.util.DelayedTask', this.onTypeAhead, this);
            }
            if (this.lastKey != Ext.EventObject.BACKSPACE && this.lastKey != Ext.EventObject.DELETE) {
                this.typeAheadTask.delay(this.typeAheadDelay);
            }
        },

        onTriggerClick: function() {
            var me = this;
            if (!me.readOnly && !me.disabled) {
                if (me.isExpanded) {
                    me.collapse();
                } else {
                    me.onFocus({});
                    if (me.triggerAction === 'all') {
                        me.doQuery(me.allQuery, true);
                    } else {
                        me.doQuery(me.getRawValue());
                    }
                }
                me.inputEl.focus();
            }
        },

        // store the last key and doQuery if relevant
        onKeyUp: function(e, t) {
            var me = this,
                key = e.getKey();

            if (!me.readOnly && !me.disabled && me.editable) {
                me.lastKey = key;
                // we put this in a task so that we can cancel it if a user is
                // in and out before the queryDelay elapses

                // perform query w/ any normal key or backspace or delete
                if (!e.isSpecialKey() || key == e.BACKSPACE || key == e.DELETE) {
                    me.doQueryTask.delay(me.queryDelay);
                }
            }
        },

        initEvents: function() {
            var me = this;
            me.callParent();

            // setup keyboard handling
            me.mon(me.inputEl, 'keyup', me.onKeyUp, me);
        },

        createPicker: function() {
            var me = this,
                picker,
                menuCls = Ext.baseCSSPrefix + 'menu',
                opts = Ext.apply({
                    selModel: {
                        mode: me.multiSelect ? 'SIMPLE' : 'SINGLE'
                    },
                    floating: true,
                    hidden: true,
                    ownerCt: me.ownerCt,
                    cls: me.el.up('.' + menuCls) ? menuCls : '',
                    store: me.store,
                    displayField: me.displayField,
                    focusOnToFront: false,
                    pageSize: me.pageSize
                }, me.listConfig, me.defaultListConfig);

            picker = me.picker = Ext.create('Ext.view.BoundList', opts);

            me.mon(picker, {
                itemclick: me.onItemClick,
                refresh: me.onListRefresh,
                scope: me
            });

            me.mon(picker.getSelectionModel(), {
                selectionChange: me.onListSelectionChange,
                scope: me
            });

            return picker;
        },

        onListRefresh: function() {
            this.alignPicker();
            this.syncSelection();
        },

        onItemClick: function(picker, record){
            /*
             * If we're doing single selection, the selection change events won't fire when
             * clicking on the selected element. Detect it here.
             */
            var me = this,
                lastSelection = me.lastSelection,
                valueField = me.valueField,
                selected;

            if (!me.multiSelect && lastSelection) {
                selected = lastSelection[0];
                if (record.get(valueField) === selected.get(valueField)) {
                    me.collapse();
                }
            }
        },

        onListSelectionChange: function(list, selectedRecords) {
            var me = this;
            // Only react to selection if it is not called from setValue, and if our list is
            // expanded (ignores changes to the selection model triggered elsewhere)
            if (!me.ignoreSelection && me.isExpanded) {
                if (!me.multiSelect) {
                    Ext.defer(me.collapse, 1, me);
                }
                me.setValue(selectedRecords, false);
                if (selectedRecords.length > 0) {
                    me.fireEvent('select', me, selectedRecords);
                }
                me.inputEl.focus();
            }
        },

        /**
         * @private
         * Enables the key nav for the BoundList when it is expanded.
         */
        onExpand: function() {
            var me = this,
                keyNav = me.listKeyNav,
                selectOnTab = me.selectOnTab,
                picker = me.getPicker();

            // Handle BoundList navigation from the input field. Insert a tab listener specially to enable selectOnTab.
            if (keyNav) {
                keyNav.enable();
            } else {
                keyNav = me.listKeyNav = Ext.create('Ext.view.BoundListKeyNav', this.inputEl, {
                    boundList: picker,
                    forceKeyDown: true,
                    tab: function(e) {
                        if (selectOnTab) {
                            this.selectHighlighted(e);
                            me.triggerBlur();
                        }
                        // Tab key event is allowed to propagate to field
                        return true;
                    }
                });
            }

            // While list is expanded, stop tab monitoring from Ext.form.field.Trigger so it doesn't short-circuit selectOnTab
            if (selectOnTab) {
                me.ignoreMonitorTab = true;
            }

            Ext.defer(keyNav.enable, 1, keyNav); //wait a bit so it doesn't react to the down arrow opening the picker
            me.inputEl.focus();
        },

        /**
         * @private
         * Disables the key nav for the BoundList when it is collapsed.
         */
        onCollapse: function() {
            var me = this,
                keyNav = me.listKeyNav;
            if (keyNav) {
                keyNav.disable();
                me.ignoreMonitorTab = false;
            }
        },

        /**
         * Selects an item by a {@link Ext.data.Model Model}, or by a key value.
         * @param r
         */
        select: function(r) {
            this.setValue(r, true);
        },

        /**
         * Find the record by searching for a specific field/value combination
         * Returns an Ext.data.Record or false
         * @private
         */
        findRecord: function(field, value) {
            var ds = this.store,
                idx = ds.findExact(field, value);
            return idx !== -1 ? ds.getAt(idx) : false;
        },
        findRecordByValue: function(value) {
            return this.findRecord(this.valueField, value);
        },
        findRecordByDisplay: function(value) {
            return this.findRecord(this.displayField, value);
        },

        /**
         * Sets the specified value(s) into the field. For each value, if a record is found in the {@link #store} that
         * matches based on the {@link #valueField}, then that record's {@link #displayField} will be displayed in the
         * field.  If no match is found, and the {@link #valueNotFoundText} config option is defined, then that will be
         * displayed as the default field text. Otherwise a blank value will be shown, although the value will still be set.
         * @param {String|Array} value The value(s) to be set. Can be either a single String or {@link Ext.data.Model},
         * or an Array of Strings or Models.
         * @return {Ext.form.field.Field} this
         */
        setValue: function(value, doSelect) {
            var me = this,
                valueNotFoundText = me.valueNotFoundText,
                inputEl = me.inputEl,
                i, len, record,
                models = [],
                displayTplData = [],
                processedValue = [];

            if (me.store.loading) {
                // Called while the Store is loading. Ensure it is processed by the onLoad method.
                me.value = value;
                return me;
            }

            // This method processes multi-values, so ensure value is an array.
            value = Ext.Array.from(value);

            // Loop through values
            for (i = 0, len = value.length; i < len; i++) {
                record = value[i];
                if (!record || !record.isModel) {
                    record = me.findRecordByValue(record);
                }
                // record found, select it.
                if (record) {
                    models.push(record);
                    displayTplData.push(record.data);
                    processedValue.push(record.get(me.valueField));
                }
                // record was not found, this could happen because
                // store is not loaded or they set a value not in the store
                else {
                    // if valueNotFoundText is defined, display it, otherwise display nothing for this value
                    if (Ext.isDefined(valueNotFoundText)) {
                        displayTplData.push(valueNotFoundText);
                    }
                    processedValue.push(value[i]);
                }
            }

            // Set the value of this field. If we are multiselecting, then that is an array.
            me.value = me.multiSelect ? processedValue : processedValue[0];
            if (!Ext.isDefined(me.value)) {
                me.value = null;
            }
            me.displayTplData = displayTplData; //store for getDisplayValue method
            me.lastSelection = me.valueModels = models;

            if (inputEl && me.emptyText && !Ext.isEmpty(value)) {
                inputEl.removeCls(me.emptyCls);
            }

            // Calculate raw value from the collection of Model data
            me.setRawValue(me.getDisplayValue());
            me.checkChange();

            if (doSelect !== false) {
                me.syncSelection();
            }
            me.applyEmptyText();

            return me;
        },

        /**
         * @private Generate the string value to be displayed in the text field for the currently stored value
         */
        getDisplayValue: function() {
            return this.displayTpl.apply(this.displayTplData);
        },

        getValue: function() {
            // If the user has not changed the raw field value since a value was selected from the list,
            // then return the structured value from the selection. If the raw field value is different
            // than what would be displayed due to selection, return that raw value.
            var me = this,
                picker = me.picker,
                rawValue = me.getRawValue(), //current value of text field
                value = me.value; //stored value from last selection or setValue() call

            if (me.getDisplayValue() !== rawValue) {
                value = rawValue;
                me.value = me.displayTplData = me.valueModels = null;
                if (picker) {
                    me.ignoreSelection++;
                    picker.getSelectionModel().deselectAll();
                    me.ignoreSelection--;
                }
            }

            return value;
        },

        getSubmitValue: function() {
            return this.getValue();
        },

        isEqual: function(v1, v2) {
            var fromArray = Ext.Array.from,
                i, len;

            v1 = fromArray(v1);
            v2 = fromArray(v2);
            len = v1.length;

            if (len !== v2.length) {
                return false;
            }

            for(i = 0; i < len; i++) {
                if (v2[i] !== v1[i]) {
                    return false;
                }
            }

            return true;
        },

        /**
         * Clears any value currently set in the ComboBox.
         */
        clearValue: function() {
            this.setValue([]);
        },

        /**
         * @private Synchronizes the selection in the picker to match the current value of the combobox.
         */
        syncSelection: function() {
            var me = this,
                ExtArray = Ext.Array,
                picker = me.picker,
                selection, selModel;
            if (picker) {
                // From the value, find the Models that are in the store's current data
                selection = [];
                ExtArray.forEach(me.valueModels || [], function(value) {
                    if (value && value.isModel && me.store.indexOf(value) >= 0) {
                        selection.push(value);
                    }
                });

                // Update the selection to match
                me.ignoreSelection++;
                selModel = picker.getSelectionModel();
                selModel.deselectAll();
                if (selection.length) {
                    selModel.select(selection);
                }
                me.ignoreSelection--;
            }
        }
    });