File: web/bundles/extjs/src/layout/component/field/ComboBox.js

/*
This file is part of Ext JS 4.2

Copyright (c) 2011-2013 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as
published by the Free Software Foundation and appearing in the file LICENSE included in the
packaging of this file.

Please review the following information to ensure the GNU General Public License version 3.0
requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department
at http://www.sencha.com/contact.

Build date: 2013-05-16 14:36:50 (f9be68accb407158ba2b1be2c226a6ce1f649314)
*/
/**
 * Layout class for {@link Ext.form.field.ComboBox} fields. Handles sizing the input field.
 * @private
 */
Ext.define('Ext.layout.component.field.ComboBox', {
    extend: 'Ext.layout.component.field.Trigger',
    alias: 'layout.combobox',
    requires: ['Ext.util.TextMetrics'],

    type: 'combobox',

    startingWidth: null,

    getTextWidth: function () {
        var me = this,
            owner = me.owner,
            store = owner.store,
            field = owner.displayField,
            storeLn = store.data.length,
            value = '',
            i = 0, n = 0, ln, item, width;

        for (; i < storeLn; i++) {
            item = store.getAt(i).data[field];
            ln = item.length;
            // compare the current item's length with the current longest length and store the value
            if (ln > n) {
                n = ln;
                value = item;
            }
        }

        width = Math.max(me.callParent(arguments), owner.inputEl.getTextWidth(value + owner.growAppend));

        // it's important to know the starting width else the inputEl could be resized smaller than the boundlist
        // NOTE that when removing items from the store that the startingWidth needs to be recalculated
        if (!me.startingWidth || owner.removingRecords) {
            me.startingWidth = width;

            // also, if the width is less than growMin reset the default boundlist width
            // or it will appear wider than the component if the trigger is clicked
            if (width < owner.growMin) {
                owner.defaultListConfig.minWidth = owner.growMin;
            }

            owner.removingRecords = false;
        }
 
        // only resize if the new width is greater than the starting width
        return (width < me.startingWidth) ? me.startingWidth : width;
    }
});