    /**
     * A layout that arranges items vertically down a Container. This layout optionally divides available vertical space
     * between child items containing a numeric `flex` configuration.
     *
     * This layout may also be used to set the widths of child items by configuring it with the {@link #align} option.
     *
     *     @example
     *     Ext.create('Ext.Panel', {
     *         width: 500,
     *         height: 400,
     *         title: "VBoxLayout Panel",
     *         layout: {
     *             type: 'vbox',
     *             align: 'center'
     *         },
     *         renderTo: document.body,
     *         items: [{
     *             xtype: 'panel',
     *             title: 'Inner Panel One',
     *             width: 250,
     *             flex: 2
     *         },
     *         {
     *             xtype: 'panel',
     *             title: 'Inner Panel Two',
     *             width: 250,
     *             flex: 4
     *         },
     *         {
     *             xtype: 'panel',
     *             title: 'Inner Panel Three',
     *             width: '50%',
     *             flex: 4
     *         }]
     *     });
     */
    Ext.define('Ext.layout.container.VBox', {

        /* Begin Definitions */

        alias: ['layout.vbox'],
        extend: 'Ext.layout.container.Box',
        alternateClassName: 'Ext.layout.VBoxLayout',

        /* End Definitions */

        /**
         * @cfg {String} align
         * Controls how the child items of the container are aligned. Acceptable configuration values for this property are:
         *
         * - **left** : **Default** child items are aligned horizontally at the **left** side of the container.
         * - **center** : child items are aligned horizontally at the **mid-width** of the container.
         * - **right** : child items are aligned horizontally at the **right** of the container.
         * - **stretch** : child items are stretched horizontally to fill the width of the container.
         * - **stretchmax** : child items are stretched horizontally to the size of the largest item.
         */
        align : 'left', // left, center, stretch, strechmax

        /**
         * @cfg {Boolean} constrainAlign
         * Limits the size of {@link #align aligned} components to the size of the container under certain circumstances.
         * Firstly, the container width must not be determined by the width of the child components. Secondly, the child
         * components must have their width {@link Ext.AbstractComponent#shrinkWrap shrinkwrapped}.
         */
        constrainAlign: false,

        type: 'vbox',

        direction: 'vertical',

        horizontal: false,

        names: {
            // parallel
            beforeX: 'top',
            leftCap: 'Top',
            afterX: 'bottom',
            width: 'height',
            contentWidth: 'contentHeight',
            minWidth: 'minHeight',
            maxWidth: 'maxHeight',
            widthCap: 'Height',
            widthModel: 'heightModel',
            widthIndex: 1,
            x: 'y',
            scrollLeft: 'scrollTop',
            overflowX: 'overflowY',
            hasOverflowX: 'hasOverflowY',
            invalidateScrollX: 'invalidateScrollY',
            parallelMargins: 'tb',

            // perpendicular
            center: 'center',
            beforeY: 'left',
            afterY: 'right',
            height: 'width',
            contentHeight: 'contentWidth',
            minHeight: 'minWidth',
            maxHeight: 'maxWidth',
            heightCap: 'Width',
            heightModel: 'widthModel',
            heightIndex: 0,
            y: 'x',
            scrollTop: 'scrollLeft',
            overflowY: 'overflowX',
            hasOverflowY: 'hasOverflowX',
            invalidateScrollY: 'invalidateScrollX',
            perpendicularMargins: 'lr',

            // Methods
            getWidth: 'getHeight',
            getHeight: 'getWidth',
            setWidth: 'setHeight',
            setHeight: 'setWidth',
            gotWidth: 'gotHeight',
            gotHeight: 'gotWidth',
            setContentWidth: 'setContentHeight',
            setContentHeight: 'setContentWidth',
            setWidthInDom: 'setHeightInDom',
            setHeightInDom: 'setWidthInDom'
        },

        sizePolicy: {
            flex: {
                '': {
                    readsWidth : 0,
                    readsHeight: 0,
                    setsWidth  : 0,
                    setsHeight : 1
                },
                stretch: {
                    readsWidth : 0,
                    readsHeight: 0,
                    setsWidth  : 1,
                    setsHeight : 1
                },
                stretchmax: {
                    readsWidth : 1,
                    readsHeight: 0,
                    setsWidth  : 1,
                    setsHeight : 1
                }
            },
            '': {
                readsWidth : 0,
                readsHeight: 0,
                setsWidth  : 0,
                setsHeight : 0
            },
            stretch: {
                readsWidth : 0,
                readsHeight: 0,
                setsWidth  : 1,
                setsHeight : 0
            },
            stretchmax: {
                readsWidth : 1,
                readsHeight: 0,
                setsWidth  : 1,
                setsHeight : 0
            }
        }
    });