    /**
     * @class Ext.form.field.TextArea
     * @extends Ext.form.field.Text

    This class creates a multiline text field, which can be used as a direct replacement for traditional
    textarea fields. In addition, it supports automatically {@link #grow growing} the height of the textarea to
    fit its content.

    All of the configuration options from {@link Ext.form.field.Text} can be used on TextArea.
    {@img Ext.form.TextArea/Ext.form.TextArea.png Ext.form.TextArea component}
    Example usage:

        Ext.create('Ext.form.FormPanel', {
            title      : 'Sample TextArea',
            width      : 400,
            bodyPadding: 10,
            renderTo   : Ext.getBody(),
            items: [{
                xtype     : 'textareafield',
                grow      : true,
                name      : 'message',
                fieldLabel: 'Message',
                anchor    : '100%'
            }]
        });

    Some other useful configuration options when using {@link #grow} are {@link #growMin} and {@link #growMax}. These
    allow you to set the minimum and maximum grow heights for the textarea.

     * @docauthor Robert Dougan <rob@sencha.com>
     */
    Ext.define('Ext.form.field.TextArea', {
        extend:'Ext.form.field.Text',
        alias: ['widget.textareafield', 'widget.textarea'],
        alternateClassName: 'Ext.form.TextArea',
        requires: ['Ext.XTemplate', 'Ext.layout.component.field.TextArea'],

        fieldSubTpl: [
            '<textarea id="{id}" ',
                '<tpl if="name">name="{name}" </tpl>',
                '<tpl if="rows">rows="{rows}" </tpl>',
                '<tpl if="cols">cols="{cols}" </tpl>',
                '<tpl if="tabIdx">tabIndex="{tabIdx}" </tpl>',
                'class="{fieldCls} {typeCls}" ',
                'autocomplete="off">',
            '</textarea>',
            {
                compiled: true,
                disableFormats: true
            }
        ],

        /**
         * @cfg {Number} growMin The minimum height to allow when <tt>{@link Ext.form.field.Text#grow grow}=true</tt>
         * (defaults to <tt>60</tt>)
         */
        growMin: 60,

        /**
         * @cfg {Number} growMax The maximum height to allow when <tt>{@link Ext.form.field.Text#grow grow}=true</tt>
         * (defaults to <tt>1000</tt>)
         */
        growMax: 1000,

        /**
         * @cfg {String} growAppend
         * A string that will be appended to the field's current value for the purposes of calculating the target
         * field size. Only used when the {@link #grow} config is <tt>true</tt>. Defaults to a newline for TextArea
         * to ensure there is always a space below the current line.
         */
        growAppend: '\n-',

        /**
         * @cfg {Number} cols An initial value for the 'cols' attribute on the textarea element. This is only
         * used if the component has no configured {@link #width} and is not given a width by its container's
         * layout. Defaults to <tt>20</tt>.
         */
        cols: 20,

        /**
         * @cfg {Number} cols An initial value for the 'cols' attribute on the textarea element. This is only
         * used if the component has no configured {@link #width} and is not given a width by its container's
         * layout. Defaults to <tt>4</tt>.
         */
        rows: 4,

        /**
         * @cfg {Boolean} enterIsSpecial
         * True if you want the enter key to be classed as a <tt>special</tt> key. Special keys are generally navigation
         * keys (arrows, space, enter). Setting the config property to <tt>true</tt> would mean that you could not insert
         * returns into the textarea.
         * (defaults to <tt>false</tt>)
         */
        enterIsSpecial: false,

        /**
         * @cfg {Boolean} preventScrollbars <tt>true</tt> to prevent scrollbars from appearing regardless of how much text is
         * in the field. This option is only relevant when {@link #grow} is <tt>true</tt>. Equivalent to setting overflow: hidden, defaults to
         * <tt>false</tt>.
         */
        preventScrollbars: false,

        // private
        componentLayout: 'textareafield',

        // private
        onRender: function(ct, position) {
            var me = this;
            Ext.applyIf(me.subTplData, {
                cols: me.cols,
                rows: me.rows
            });

            me.callParent(arguments);
        },

        // private
        afterRender: function(){
            var me = this;

            me.callParent(arguments);

            if (me.grow) {
                if (me.preventScrollbars) {
                    me.inputEl.setStyle('overflow', 'hidden');
                }
                me.inputEl.setHeight(me.growMin);
            }
        },

        // private
        fireKey: function(e) {
            if (e.isSpecialKey() && (this.enterIsSpecial || (e.getKey() !== e.ENTER || e.hasModifier()))) {
                this.fireEvent('specialkey', this, e);
            }
        },

        /**
         * Automatically grows the field to accomodate the height of the text up to the maximum field height allowed.
         * This only takes effect if <tt>{@link #grow} = true</tt>, and fires the {@link #autosize} event if
         * the height changes.
         */
        autoSize: function() {
            var me = this,
                height;

            if (me.grow && me.rendered) {
                me.doComponentLayout();
                height = me.inputEl.getHeight();
                if (height !== me.lastInputHeight) {
                    me.fireEvent('autosize', height);
                    me.lastInputHeight = height;
                }
            }
        },

        // private
        initAria: function() {
            this.callParent(arguments);
            this.getActionEl().dom.setAttribute('aria-multiline', true);
        },

        /**
         * @protected override
         * To get the natural width of the textarea element, we do a simple calculation based on the
         * 'cols' config. We use hard-coded numbers to approximate what browsers do natively,
         * to avoid having to read any styles which would hurt performance.
         */
        getBodyNaturalWidth: function() {
            return Math.round(this.cols * 6.5) + 20;
        }

    });