    /**
     * The rowbody feature enhances the grid's markup to have an additional
     * tr -> td -> div which spans the entire width of the original row.
     *
     * This is useful to to associate additional information with a particular
     * record in a grid.
     *
     * Rowbodies are initially hidden unless you override setupRowData.
     *
     * Will expose additional events on the gridview with the prefix of 'rowbody'.
     * For example: 'rowbodyclick', 'rowbodydblclick', 'rowbodycontextmenu'.
     *
     * # Example
     *
     *     @example
     *     Ext.define('Animal', {
     *         extend: 'Ext.data.Model',
     *         fields: ['name', 'latin', 'desc']
     *     });
     *
     *     Ext.create('Ext.grid.Panel', {
     *         width: 400,
     *         height: 300,
     *         renderTo: Ext.getBody(),
     *         store: {
     *             model: 'Animal',
     *             data: [
     *                 {name: 'Tiger', latin: 'Panthera tigris',
     *                  desc: 'The largest cat species, weighing up to 306 kg (670 lb).'},
     *                 {name: 'Roman snail', latin: 'Helix pomatia',
     *                  desc: 'A species of large, edible, air-breathing land snail.'},
     *                 {name: 'Yellow-winged darter', latin: 'Sympetrum flaveolum',
     *                  desc: 'A dragonfly found in Europe and mid and Northern China.'},
     *                 {name: 'Superb Fairy-wren', latin: 'Malurus cyaneus',
     *                  desc: 'Common and familiar across south-eastern Australia.'}
     *             ]
     *         },
     *         columns: [{
     *             dataIndex: 'name',
     *             text: 'Common name',
     *             width: 125
     *         }, {
     *             dataIndex: 'latin',
     *             text: 'Scientific name',
     *             flex: 1
     *         }],
     *         features: [{
     *             ftype: 'rowbody',
     *             setupRowData: function(record, rowIndex, rowValues) {
     *                 var headerCt = this.view.headerCt,
     *                     colspan = headerCt.getColumnCount();
     *                 // Usually you would style the my-body-class in CSS file
     *                 return {
     *                     rowBody: '<div style="padding: 1em">'+record.get("desc")+'</div>',
     *                     rowBodyCls: "my-body-class",
     *                     rowBodyColspan: colspan
     *                 };
     *             }
     *         }]
     *     });
     */
    Ext.define('Ext.grid.feature.RowBody', {
        extend: 'Ext.grid.feature.Feature',
        alias: 'feature.rowbody',

        rowBodyCls: Ext.baseCSSPrefix + 'grid-row-body',
        rowBodyHiddenCls: Ext.baseCSSPrefix + 'grid-row-body-hidden',
        rowBodyTdSelector: 'td.' + Ext.baseCSSPrefix + 'grid-cell-rowbody',

        eventPrefix: 'rowbody',
        eventSelector: 'tr.' + Ext.baseCSSPrefix + 'grid-rowbody-tr',

        tableTpl: {
            before: function(values, out) {
                var view = values.view,
                    rowValues = view.rowValues;

                if (!rowValues.visibleColumns) {
                    rowValues.visibleColumns = view.headerCt.getVisibleGridColumns();
                }
                this.rowBody.setup(values.rows, rowValues);
            },
            after: function(values, out) {
                var view = values.view,
                    rowValues = view.rowValues;

                this.rowBody.cleanup(values.rows, rowValues);
            },
            priority: 100
        },

        extraRowTpl: [
            '{%',
                'values.view.rowBodyFeature.setupRowData(values.record, values.recordIndex, values);',
                'this.nextTpl.applyOut(values, out, parent);',
            '%}',
            '<tr class="' + Ext.baseCSSPrefix + 'grid-rowbody-tr {rowBodyCls}">',
                '<td class="' + Ext.baseCSSPrefix + 'grid-cell-rowbody' + '" colspan="{rowBodyColspan}">',
                    '<div class="' + Ext.baseCSSPrefix + 'grid-rowbody' + ' {rowBodyDivCls}">{rowBody}</div>',
                '</td>',
            '</tr>', {
                priority: 100,

                syncRowHeights: function(firstRow, secondRow) {
                    var owner = this.owner,
                        firstRowBody = Ext.fly(firstRow).down(owner.eventSelector, true),
                        secondRowBody,
                        firstHeight, secondHeight;

                    // Sync the heights of row body elements in each row if they need it.
                    if (firstRowBody && (secondRowBody = Ext.fly(secondRow).down(owner.eventSelector, true))) {
                        if ((firstHeight = firstRowBody.offsetHeight) > (secondHeight = secondRowBody.offsetHeight)) {
                            Ext.fly(secondRowBody).setHeight(firstHeight);
                        }
                        else if (secondHeight > firstHeight) {
                            Ext.fly(firstRowBody).setHeight(secondHeight);
                        }
                    }
                },

                syncContent: function(destRow, sourceRow) {
                    var owner = this.owner,
                        destRowBody = Ext.fly(destRow).down(owner.eventSelector, true),
                        sourceRowBody;

                    // Sync the heights of row body elements in each row if they need it.
                    if (destRowBody && (sourceRowBody = Ext.fly(sourceRow).down(owner.eventSelector, true))) {
                        Ext.fly(destRowBody).syncContent(sourceRowBody);
                    }
                }
            }
        ],

        init: function(grid) {
            var me = this,
                view = me.view;

            view.rowBodyFeature = me;

            // If we are not inside a wrapped row, we must listen for mousedown in the body row to trigger selection.
            if (!view.findFeature('rowwrap')) {
                grid.mon(view, {
                    element: 'el',
                    mousedown: me.onMouseDown,
                    scope: me
                });
            }

            view.headerCt.on({
                columnschanged: me.onColumnsChanged,
                scope: me
            });
            view.addTableTpl(me.tableTpl).rowBody = me;
            view.addRowTpl(Ext.XTemplate.getTpl(this, 'extraRowTpl'));
            me.callParent(arguments);
        },

        // Needed when not used inside a RowWrap to select the data row when mousedown on the body row.
        onMouseDown: function(e) {
            var me = this,
                tableRow = e.getTarget(me.eventSelector);

            // If we have mousedowned on a row body TR and its previous sibling is a grid row, pass that onto the view for processing
            if (tableRow && Ext.fly(tableRow = tableRow.previousSibling).is(me.view.getItemSelector())) {
                e.target = tableRow;
                me.view.handleEvent(e);
            }
        },

        getSelectedRow: function(view, rowIndex) {
            var selectedRow = view.getNode(rowIndex, false);
            if (selectedRow) {
                return Ext.fly(selectedRow).down(this.eventSelector);
            }
            return null;
        },

        // When columns added/removed, keep row body colspan in sync with number of columns.
        onColumnsChanged: function(headerCt) {
            var items = this.view.el.query(this.rowBodyTdSelector),
                colspan = headerCt.getGridColumns().length,
                len = items.length,
                i;

            for (i = 0; i < len; ++i) {
                items[i].colSpan = colspan;
            }
        },

        /**
         * @method getAdditionalData
         * Provides additional data to the prepareData call within the grid view.
         * The rowbody feature adds 3 additional variables into the grid view's template.
         * These are rowBodyCls, rowBodyColspan, and rowBody.
         * @param {Object} data The data for this particular record.
         * @param {Number} idx The row index for this record.
         * @param {Ext.data.Model} record The record instance
         * @param {Object} orig The original result from the prepareData call to massage.
         */
        setupRowData: function(record, rowIndex, rowValues) {
            if (this.getAdditionalData) {
                Ext.apply(rowValues, this.getAdditionalData(record.data, rowIndex, record, rowValues));
            }
        },

        setup: function(rows, rowValues) {
            rowValues.rowBodyCls = this.rowBodyCls;
            rowValues.rowBodyColspan = rowValues.view.getGridColumns().length;
        },

        cleanup: function(rows, rowValues) {
            rowValues.rowBodyCls = rowValues.rowBodyColspan = rowValues.rowBody = null;
        }
    });