    /*!
     * Ext JS Library 3.3.0
     * Copyright(c) 2006-2010 Ext JS, Inc.
     * licensing@extjs.com
     * http://www.extjs.com/license
     */
    /**
     * @class Ext.grid.GridView
     * @extends Ext.util.Observable
     * This class encapsulates the user interface of an {@link Ext.grid.GridPanel}.
     * Methods of this class may be used to access user interface elements to enable
     * special display effects. Do not change the DOM structure of the user interface.
     * This class does not provide ways to manipulate the underlying data. The data
     * model of a Grid is held in an {@link Ext.data.Store}.
     * @constructor
     * @param {Object} config
     */
    Ext.grid.GridView = Ext.extend(Ext.util.Observable, {
        /**
         * Override this function to apply custom CSS classes to rows during rendering.  You can also supply custom
         * parameters to the row template for the current row to customize how it is rendered using the rowParams
         * parameter.  This function should return the CSS class name (or empty string '' for none) that will be added
         * to the row's wrapping div.  To apply multiple class names, simply return them space-delimited within the string
         * (e.g., 'my-class another-class'). Example usage:

    viewConfig: {
        forceFit: true,
        showPreview: true, // custom property
        enableRowBody: true, // required to create a second, full-width row to show expanded Record data
        getRowClass: function(record, rowIndex, rp, ds){ // rp = rowParams
            if(this.showPreview){
                rp.body = '<p>'+record.data.excerpt+'</p>';
                return 'x-grid3-row-expanded';
            }
            return 'x-grid3-row-collapsed';
        }
    },

         * @param {Record} record The {@link Ext.data.Record} corresponding to the current row.
         * @param {Number} index The row index.
         * @param {Object} rowParams A config object that is passed to the row template during rendering that allows
         * customization of various aspects of a grid row.
         * If {@link #enableRowBody} is configured true, then the following properties may be set
         * by this function, and will be used to render a full-width expansion row below each grid row:
         *
         * body : String An HTML fragment to be used as the expansion row's body content (defaults to '').
         * bodyStyle : String A CSS style specification that will be applied to the expansion row's <tr> element. (defaults to '').
         *
         * The following property will be passed in, and may be appended to:
         *
         * tstyle : String A CSS style specification that willl be applied to the <table> element which encapsulates
         * both the standard grid row, and any expansion row.
         *
         * @param {Store} store The {@link Ext.data.Store} this grid is bound to
         * @method getRowClass
         * @return {String} a CSS class name to add to the row.
         */

        /**
         * @cfg {Boolean} enableRowBody True to add a second TR element per row that can be used to provide a row body
         * that spans beneath the data row.  Use the {@link #getRowClass} method's rowParams config to customize the row body.
         */

        /**
         * @cfg {String} emptyText Default text (html tags are accepted) to display in the grid body when no rows
         * are available (defaults to ''). This value will be used to update the {@link #mainBody}:

        this.mainBody.update('<div class="x-grid-empty">' + this.emptyText + '</div>');

         */

        /**
         * @cfg {Boolean} headersDisabled True to disable the grid column headers (defaults to false).
         * Use the {@link Ext.grid.ColumnModel ColumnModel} {@link Ext.grid.ColumnModel#menuDisabled menuDisabled}
         * config to disable the menu for individual columns.  While this config is true the
         * following will be disabled:
         * clicking on header to sort
         * the trigger to reveal the menu.
         *
         */

        /**
         * A customized implementation of a {@link Ext.dd.DragZone DragZone} which provides default implementations
         * of the template methods of DragZone to enable dragging of the selected rows of a GridPanel.
         * See {@link Ext.grid.GridDragZone} for details.
         * This will only be present:
         * if the owning GridPanel was configured with {@link Ext.grid.GridPanel#enableDragDrop enableDragDrop}: true.
         * after the owning GridPanel has been rendered.
         *
         * @property dragZone
         * @type {Ext.grid.GridDragZone}
         */

        /**
         * @cfg {Boolean} deferEmptyText True to defer {@link #emptyText} being applied until the store's
         * first load (defaults to true).
         */
        deferEmptyText : true,

        /**
         * @cfg {Number} scrollOffset The amount of space to reserve for the vertical scrollbar
         * (defaults to undefined). If an explicit value isn't specified, this will be automatically
         * calculated.
         */
        scrollOffset : undefined,

        /**
         * @cfg {Boolean} autoFill
         * Defaults to false.  Specify true to have the column widths re-proportioned
         * when the grid is initially rendered.  The
         * {@link Ext.grid.Column#width initially configured width} of each column will be adjusted
         * to fit the grid width and prevent horizontal scrolling. If columns are later resized (manually
         * or programmatically), the other columns in the grid will not be resized to fit the grid width.
         * See {@link #forceFit} also.
         */
        autoFill : false,

        /**
         * @cfg {Boolean} forceFit
         * Defaults to false.  Specify true to have the column widths re-proportioned
         * at all times.  The {@link Ext.grid.Column#width initially configured width} of each
         * column will be adjusted to fit the grid width and prevent horizontal scrolling. If columns are
         * later resized (manually or programmatically), the other columns in the grid will be resized
         * to fit the grid width. See {@link #autoFill} also.
         */
        forceFit : false,

        /**
         * @cfg {Array} sortClasses The CSS classes applied to a header when it is sorted. (defaults to ['sort-asc', 'sort-desc'])
         */
        sortClasses : ['sort-asc', 'sort-desc'],

        /**
         * @cfg {String} sortAscText The text displayed in the 'Sort Ascending' menu item (defaults to 'Sort Ascending')
         */
        sortAscText : 'Sort Ascending',

        /**
         * @cfg {String} sortDescText The text displayed in the 'Sort Descending' menu item (defaults to 'Sort Descending')
         */
        sortDescText : 'Sort Descending',

        /**
         * @cfg {String} columnsText The text displayed in the 'Columns' menu item (defaults to 'Columns')
         */
        columnsText : 'Columns',

        /**
         * @cfg {String} selectedRowClass The CSS class applied to a selected row (defaults to 'x-grid3-row-selected'). An
         * example overriding the default styling:

        .x-grid3-row-selected {background-color: yellow;}

         * Note that this only controls the row, and will not do anything for the text inside it.  To style inner
         * facets (like text) use something like:

        .x-grid3-row-selected .x-grid3-cell-inner {
            color: #FFCC00;
        }

         * @type String
         */
        selectedRowClass : 'x-grid3-row-selected',

        // private
        borderWidth : 2,
        tdClass : 'x-grid3-cell',
        hdCls : 'x-grid3-hd',

        /**
         * @cfg {Boolean} markDirty True to show the dirty cell indicator when a cell has been modified. Defaults to true.
         */
        markDirty : true,

        /**
         * @cfg {Number} cellSelectorDepth The number of levels to search for cells in event delegation (defaults to 4)
         */
        cellSelectorDepth : 4,

        /**
         * @cfg {Number} rowSelectorDepth The number of levels to search for rows in event delegation (defaults to 10)
         */
        rowSelectorDepth : 10,

        /**
         * @cfg {Number} rowBodySelectorDepth The number of levels to search for row bodies in event delegation (defaults to 10)
         */
        rowBodySelectorDepth : 10,

        /**
         * @cfg {String} cellSelector The selector used to find cells internally (defaults to 'td.x-grid3-cell')
         */
        cellSelector : 'td.x-grid3-cell',

        /**
         * @cfg {String} rowSelector The selector used to find rows internally (defaults to 'div.x-grid3-row')
         */
        rowSelector : 'div.x-grid3-row',

        /**
         * @cfg {String} rowBodySelector The selector used to find row bodies internally (defaults to 'div.x-grid3-row')
         */
        rowBodySelector : 'div.x-grid3-row-body',

        // private
        firstRowCls: 'x-grid3-row-first',
        lastRowCls: 'x-grid3-row-last',
        rowClsRe: /(?:^|\s+)x-grid3-row-(first|last|alt)(?:\s+|$)/g,

        /**
         * @cfg {String} headerMenuOpenCls The CSS class to add to the header cell when its menu is visible. Defaults to 'x-grid3-hd-menu-open'
         */
        headerMenuOpenCls: 'x-grid3-hd-menu-open',

        /**
         * @cfg {String} rowOverCls The CSS class added to each row when it is hovered over. Defaults to 'x-grid3-row-over'
         */
        rowOverCls: 'x-grid3-row-over',

        constructor : function(config) {
            Ext.apply(this, config);

            // These events are only used internally by the grid components
            this.addEvents(
                /**
                 * @event beforerowremoved
                 * Internal UI Event. Fired before a row is removed.
                 * @param {Ext.grid.GridView} view
                 * @param {Number} rowIndex The index of the row to be removed.
                 * @param {Ext.data.Record} record The Record to be removed
                 */
                'beforerowremoved',

                /**
                 * @event beforerowsinserted
                 * Internal UI Event. Fired before rows are inserted.
                 * @param {Ext.grid.GridView} view
                 * @param {Number} firstRow The index of the first row to be inserted.
                 * @param {Number} lastRow The index of the last row to be inserted.
                 */
                'beforerowsinserted',

                /**
                 * @event beforerefresh
                 * Internal UI Event. Fired before the view is refreshed.
                 * @param {Ext.grid.GridView} view
                 */
                'beforerefresh',

                /**
                 * @event rowremoved
                 * Internal UI Event. Fired after a row is removed.
                 * @param {Ext.grid.GridView} view
                 * @param {Number} rowIndex The index of the row that was removed.
                 * @param {Ext.data.Record} record The Record that was removed
                 */
                'rowremoved',

                /**
                 * @event rowsinserted
                 * Internal UI Event. Fired after rows are inserted.
                 * @param {Ext.grid.GridView} view
                 * @param {Number} firstRow The index of the first inserted.
                 * @param {Number} lastRow The index of the last row inserted.
                 */
                'rowsinserted',

                /**
                 * @event rowupdated
                 * Internal UI Event. Fired after a row has been updated.
                 * @param {Ext.grid.GridView} view
                 * @param {Number} firstRow The index of the row updated.
                 * @param {Ext.data.record} record The Record backing the row updated.
                 */
                'rowupdated',

                /**
                 * @event refresh
                 * Internal UI Event. Fired after the GridView's body has been refreshed.
                 * @param {Ext.grid.GridView} view
                 */
                'refresh'
            );

            Ext.grid.GridView.superclass.constructor.call(this);
        },

        /* -------------------------------- UI Specific ----------------------------- */

        /**
         * The master template to use when rendering the GridView. Has a default template
         * @property Ext.Template
         * @type masterTpl
         */
        masterTpl: new Ext.Template(
            '',
                '',
                    '',
                        '',
                            '{header}',
                        '',
                        '',
                    '',
                    '',
                        '{body}',
                        '',
                    '',
                '',
                ' ',
                ' ',
            ''
        ),

        /**
         * The template to use when rendering headers. Has a default template
         * @property headerTpl
         * @type Ext.Template
         */
        headerTpl: new Ext.Template(
            '',
                '',
                    '{cells}',
                '',
            ''
        ),

        /**
         * The template to use when rendering the body. Has a default template
         * @property bodyTpl
         * @type Ext.Template
         */
        bodyTpl: new Ext.Template('{rows}'),

        /**
         * The template to use to render each cell. Has a default template
         * @property cellTpl
         * @type Ext.Template
         */
        cellTpl: new Ext.Template(
            '',
                '{value}',
            ''
        ),

        /**
         * @private
         * Provides default templates if they are not given for this particular instance. Most of the templates are defined on
         * the prototype, the ones defined inside this function are done so because they are based on Grid or GridView configuration
         */
        initTemplates : function() {
            var templates = this.templates || {},
                template, name,

                headerCellTpl = new Ext.Template(
                    '',
                        '',
                            this.grid.enableHdMenu ? '' : '',
                            '{value}',
                            '',
                        '',
                    ''
                ),

                rowBodyText = [
                    '',
                        '',
                            '{body}',
                        '',
                    ''
                ].join(""),

                innerText = [
                    '',
                         '',
                            '{cells}',
                            this.enableRowBody ? rowBodyText : '',
                         '',
                    ''
                ].join("");

            Ext.applyIf(templates, {
                hcell   : headerCellTpl,
                cell    : this.cellTpl,
                body    : this.bodyTpl,
                header  : this.headerTpl,
                master  : this.masterTpl,
                row     : new Ext.Template('' + innerText + ''),
                rowInner: new Ext.Template(innerText)
            });

            for (name in templates) {
                template = templates[name];

                if (template && Ext.isFunction(template.compile) && !template.compiled) {
                    template.disableFormats = true;
                    template.compile();
                }
            }

            this.templates = templates;
            this.colRe = new RegExp('x-grid3-td-([^\\s]+)', '');
        },

        /**
         * @private
         * Each GridView has its own private flyweight, accessed through this method
         */
        fly : function(el) {
            if (!this._flyweight) {
                this._flyweight = new Ext.Element.Flyweight(document.body);
            }
            this._flyweight.dom = el;
            return this._flyweight;
        },

        // private
        getEditorParent : function() {
            return this.scroller.dom;
        },

        /**
         * @private
         * Finds and stores references to important elements
         */
        initElements : function() {
            var Element  = Ext.Element,
                el       = Ext.get(this.grid.getGridEl().dom.firstChild),
                mainWrap = new Element(el.child('div.x-grid3-viewport')),
                mainHd   = new Element(mainWrap.child('div.x-grid3-header')),
                scroller = new Element(mainWrap.child('div.x-grid3-scroller'));

            if (this.grid.hideHeaders) {
                mainHd.setDisplayed(false);
            }

            if (this.forceFit) {
                scroller.setStyle('overflow-x', 'hidden');
            }

            /**
             * Read-only. The GridView's body Element which encapsulates all rows in the Grid.
             * This {@link Ext.Element Element} is only available after the GridPanel has been rendered.
             * @type Ext.Element
             * @property mainBody
             */

            Ext.apply(this, {
                el      : el,
                mainWrap: mainWrap,
                scroller: scroller,
                mainHd  : mainHd,
                innerHd : mainHd.child('div.x-grid3-header-inner').dom,
                mainBody: new Element(Element.fly(scroller).child('div.x-grid3-body')),
                focusEl : new Element(Element.fly(scroller).child('a')),

                resizeMarker: new Element(el.child('div.x-grid3-resize-marker')),
                resizeProxy : new Element(el.child('div.x-grid3-resize-proxy'))
            });

            this.focusEl.swallowEvent('click', true);
        },

        // private
        getRows : function() {
            return this.hasRows() ? this.mainBody.dom.childNodes : [];
        },

        // finder methods, used with delegation

        // private
        findCell : function(el) {
            if (!el) {
                return false;
            }
            return this.fly(el).findParent(this.cellSelector, this.cellSelectorDepth);
        },

        /**
         * Return the index of the grid column which contains the passed HTMLElement.
         * See also {@link #findRowIndex}
         * @param {HTMLElement} el The target element
         * @return {Number} The column index, or false if the target element is not within a row of this GridView.
         */
        findCellIndex : function(el, requiredCls) {
            var cell = this.findCell(el),
                hasCls;

            if (cell) {
                hasCls = this.fly(cell).hasClass(requiredCls);
                if (!requiredCls || hasCls) {
                    return this.getCellIndex(cell);
                }
            }
            return false;
        },

        // private
        getCellIndex : function(el) {
            if (el) {
                var match = el.className.match(this.colRe);

                if (match && match[1]) {
                    return this.cm.getIndexById(match[1]);
                }
            }
            return false;
        },

        // private
        findHeaderCell : function(el) {
            var cell = this.findCell(el);
            return cell && this.fly(cell).hasClass(this.hdCls) ? cell : null;
        },

        // private
        findHeaderIndex : function(el){
            return this.findCellIndex(el, this.hdCls);
        },

        /**
         * Return the HtmlElement representing the grid row which contains the passed element.
         * @param {HTMLElement} el The target HTMLElement
         * @return {HTMLElement} The row element, or null if the target element is not within a row of this GridView.
         */
        findRow : function(el) {
            if (!el) {
                return false;
            }
            return this.fly(el).findParent(this.rowSelector, this.rowSelectorDepth);
        },

        /**
         * Return the index of the grid row which contains the passed HTMLElement.
         * See also {@link #findCellIndex}
         * @param {HTMLElement} el The target HTMLElement
         * @return {Number} The row index, or false if the target element is not within a row of this GridView.
         */
        findRowIndex : function(el) {
            var row = this.findRow(el);
            return row ? row.rowIndex : false;
        },

        /**
         * Return the HtmlElement representing the grid row body which contains the passed element.
         * @param {HTMLElement} el The target HTMLElement
         * @return {HTMLElement} The row body element, or null if the target element is not within a row body of this GridView.
         */
        findRowBody : function(el) {
            if (!el) {
                return false;
            }

            return this.fly(el).findParent(this.rowBodySelector, this.rowBodySelectorDepth);
        },

        // getter methods for fetching elements dynamically in the grid

        /**
         * Return the <div> HtmlElement which represents a Grid row for the specified index.
         * @param {Number} index The row index
         * @return {HtmlElement} The div element.
         */
        getRow : function(row) {
            return this.getRows()[row];
        },

        /**
         * Returns the grid's <td> HtmlElement at the specified coordinates.
         * @param {Number} row The row index in which to find the cell.
         * @param {Number} col The column index of the cell.
         * @return {HtmlElement} The td at the specified coordinates.
         */
        getCell : function(row, col) {
            return Ext.fly(this.getRow(row)).query(this.cellSelector)[col];
        },

        /**
         * Return the <td> HtmlElement which represents the Grid's header cell for the specified column index.
         * @param {Number} index The column index
         * @return {HtmlElement} The td element.
         */
        getHeaderCell : function(index) {
            return this.mainHd.dom.getElementsByTagName('td')[index];
        },

        // manipulating elements

        // private - use getRowClass to apply custom row classes
        addRowClass : function(rowId, cls) {
            var row = this.getRow(rowId);
            if (row) {
                this.fly(row).addClass(cls);
            }
        },

        // private
        removeRowClass : function(row, cls) {
            var r = this.getRow(row);
            if(r){
                this.fly(r).removeClass(cls);
            }
        },

        // private
        removeRow : function(row) {
            Ext.removeNode(this.getRow(row));
            this.syncFocusEl(row);
        },

        // private
        removeRows : function(firstRow, lastRow) {
            var bd = this.mainBody.dom,
                rowIndex;

            for (rowIndex = firstRow; rowIndex <= lastRow; rowIndex++){
                Ext.removeNode(bd.childNodes[firstRow]);
            }

            this.syncFocusEl(firstRow);
        },

        /* ----------------------------------- Scrolling functions -------------------------------------------*/

        // private
        getScrollState : function() {
            var sb = this.scroller.dom;

            return {
                left: sb.scrollLeft,
                top : sb.scrollTop
            };
        },

        // private
        restoreScroll : function(state) {
            var sb = this.scroller.dom;
            sb.scrollLeft = state.left;
            sb.scrollTop  = state.top;
        },

        /**
         * Scrolls the grid to the top
         */
        scrollToTop : function() {
            var dom = this.scroller.dom;

            dom.scrollTop  = 0;
            dom.scrollLeft = 0;
        },

        // private
        syncScroll : function() {
            this.syncHeaderScroll();
            var mb = this.scroller.dom;
            this.grid.fireEvent('bodyscroll', mb.scrollLeft, mb.scrollTop);
        },

        // private
        syncHeaderScroll : function() {
            var innerHd    = this.innerHd,
                scrollLeft = this.scroller.dom.scrollLeft;

            innerHd.scrollLeft = scrollLeft;
            innerHd.scrollLeft = scrollLeft; // second time for IE (1/2 time first fails, other browsers ignore)
        },

        /**
         * @private
         * Ensures the given column has the given icon class
         */
        updateSortIcon : function(col, dir) {
            var sortClasses = this.sortClasses,
                sortClass   = sortClasses[dir == "DESC" ? 1 : 0],
                headers     = this.mainHd.select('td').removeClass(sortClasses);

            headers.item(col).addClass(sortClass);
        },

        /**
         * @private
         * Updates the size of every column and cell in the grid
         */
        updateAllColumnWidths : function() {
            var totalWidth = this.getTotalWidth(),
                colCount   = this.cm.getColumnCount(),
                rows       = this.getRows(),
                rowCount   = rows.length,
                widths     = [],
                row, rowFirstChild, trow, i, j;

            for (i = 0; i < colCount; i++) {
                widths[i] = this.getColumnWidth(i);
                this.getHeaderCell(i).style.width = widths[i];
            }

            this.updateHeaderWidth();

            for (i = 0; i < rowCount; i++) {
                row = rows[i];
                row.style.width = totalWidth;
                rowFirstChild = row.firstChild;

                if (rowFirstChild) {
                    rowFirstChild.style.width = totalWidth;
                    trow = rowFirstChild.rows[0];

                    for (j = 0; j < colCount; j++) {
                        trow.childNodes[j].style.width = widths[j];
                    }
                }
            }

            this.onAllColumnWidthsUpdated(widths, totalWidth);
        },

        /**
         * @private
         * Called after a column's width has been updated, this resizes all of the cells for that column in each row
         * @param {Number} column The column index
         */
        updateColumnWidth : function(column, width) {
            var columnWidth = this.getColumnWidth(column),
                totalWidth  = this.getTotalWidth(),
                headerCell  = this.getHeaderCell(column),
                nodes       = this.getRows(),
                nodeCount   = nodes.length,
                row, i, firstChild;

            this.updateHeaderWidth();
            headerCell.style.width = columnWidth;

            for (i = 0; i < nodeCount; i++) {
                row = nodes[i];
                firstChild = row.firstChild;

                row.style.width = totalWidth;
                if (firstChild) {
                    firstChild.style.width = totalWidth;
                    firstChild.rows[0].childNodes[column].style.width = columnWidth;
                }
            }

            this.onColumnWidthUpdated(column, columnWidth, totalWidth);
        },

        /**
         * @private
         * Sets the hidden status of a given column.
         * @param {Number} col The column index
         * @param {Boolean} hidden True to make the column hidden
         */
        updateColumnHidden : function(col, hidden) {
            var totalWidth = this.getTotalWidth(),
                display    = hidden ? 'none' : '',
                headerCell = this.getHeaderCell(col),
                nodes      = this.getRows(),
                nodeCount  = nodes.length,
                row, rowFirstChild, i;

            this.updateHeaderWidth();
            headerCell.style.display = display;

            for (i = 0; i < nodeCount; i++) {
                row = nodes[i];
                row.style.width = totalWidth;
                rowFirstChild = row.firstChild;

                if (rowFirstChild) {
                    rowFirstChild.style.width = totalWidth;
                    rowFirstChild.rows[0].childNodes[col].style.display = display;
                }
            }

            this.onColumnHiddenUpdated(col, hidden, totalWidth);
            delete this.lastViewWidth; //recalc
            this.layout();
        },

        /**
         * @private
         * Renders all of the rows to a string buffer and returns the string. This is called internally
         * by renderRows and performs the actual string building for the rows - it does not inject HTML into the DOM.
         * @param {Array} columns The column data acquired from getColumnData.
         * @param {Array} records The array of records to render
         * @param {Ext.data.Store} store The store to render the rows from
         * @param {Number} startRow The index of the first row being rendered. Sometimes we only render a subset of
         * the rows so this is used to maintain logic for striping etc
         * @param {Number} colCount The total number of columns in the column model
         * @param {Boolean} stripe True to stripe the rows
         * @return {String} A string containing the HTML for the rendered rows
         */
        doRender : function(columns, records, store, startRow, colCount, stripe) {
            var templates = this.templates,
                cellTemplate = templates.cell,
                rowTemplate = templates.row,
                last = colCount - 1,
                tstyle = 'width:' + this.getTotalWidth() + ';',
                // buffers
                rowBuffer = [],
                colBuffer = [],
                rowParams = {tstyle: tstyle},
                meta = {},
                len  = records.length,
                alt,
                column,
                record, i, j, rowIndex;

            //build up each row's HTML
            for (j = 0; j < len; j++) {
                record    = records[j];
                colBuffer = [];

                rowIndex = j + startRow;

                //build up each column's HTML
                for (i = 0; i < colCount; i++) {
                    column = columns[i];

                    meta.id    = column.id;
                    meta.css   = i === 0 ? 'x-grid3-cell-first ' : (i == last ? 'x-grid3-cell-last ' : '');
                    meta.attr  = meta.cellAttr = '';
                    meta.style = column.style;
                    meta.value = column.renderer.call(column.scope, record.data[column.name], meta, record, rowIndex, i, store);

                    if (Ext.isEmpty(meta.value)) {
                        meta.value = ' ';
                    }

                    if (this.markDirty && record.dirty && typeof record.modified[column.name] != 'undefined') {
                        meta.css += ' x-grid3-dirty-cell';
                    }

                    colBuffer[colBuffer.length] = cellTemplate.apply(meta);
                }

                alt = [];
                //set up row striping and row dirtiness CSS classes
                if (stripe && ((rowIndex + 1) % 2 === 0)) {
                    alt[0] = 'x-grid3-row-alt';
                }

                if (record.dirty) {
                    alt[1] = ' x-grid3-dirty-row';
                }

                rowParams.cols = colCount;

                if (this.getRowClass) {
                    alt[2] = this.getRowClass(record, rowIndex, rowParams, store);
                }

                rowParams.alt   = alt.join(' ');
                rowParams.cells = colBuffer.join('');

                rowBuffer[rowBuffer.length] = rowTemplate.apply(rowParams);
            }

            return rowBuffer.join('');
        },

        /**
         * @private
         * Adds CSS classes and rowIndex to each row
         * @param {Number} startRow The row to start from (defaults to 0)
         */
        processRows : function(startRow, skipStripe) {
            if (!this.ds || this.ds.getCount() < 1) {
                return;
            }

            var rows   = this.getRows(),
                length = rows.length,
                row, i;

            skipStripe = skipStripe || !this.grid.stripeRows;
            startRow   = startRow   || 0;

            for (i = 0; i < length; i++) {
                row = rows[i];
                if (row) {
                    row.rowIndex = i;
                    if (!skipStripe) {
                        row.className = row.className.replace(this.rowClsRe, ' ');
                        if ((i + 1) % 2 === 0){
                            row.className += ' x-grid3-row-alt';
                        }
                    }
                }
            }

            // add first/last-row classes
            if (startRow === 0) {
                Ext.fly(rows[0]).addClass(this.firstRowCls);
            }

            Ext.fly(rows[length - 1]).addClass(this.lastRowCls);
        },

        /**
         * @private
         */
        afterRender : function() {
            if (!this.ds || !this.cm) {
                return;
            }

            this.mainBody.dom.innerHTML = this.renderBody() || ' ';
            this.processRows(0, true);

            if (this.deferEmptyText !== true) {
                this.applyEmptyText();
            }

            this.grid.fireEvent('viewready', this.grid);
        },

        /**
         * @private
         * This is always intended to be called after renderUI. Sets up listeners on the UI elements
         * and sets up options like column menus, moving and resizing.
         */
        afterRenderUI: function() {
            var grid = this.grid;

            this.initElements();

            // get mousedowns early
            Ext.fly(this.innerHd).on('click', this.handleHdDown, this);

            this.mainHd.on({
                scope    : this,
                mouseover: this.handleHdOver,
                mouseout : this.handleHdOut,
                mousemove: this.handleHdMove
            });

            this.scroller.on('scroll', this.syncScroll,  this);

            if (grid.enableColumnResize !== false) {
                this.splitZone = new Ext.grid.GridView.SplitDragZone(grid, this.mainHd.dom);
            }

            if (grid.enableColumnMove) {
                this.columnDrag = new Ext.grid.GridView.ColumnDragZone(grid, this.innerHd);
                this.columnDrop = new Ext.grid.HeaderDropZone(grid, this.mainHd.dom);
            }

            if (grid.enableHdMenu !== false) {
                this.hmenu = new Ext.menu.Menu({id: grid.id + '-hctx'});
                this.hmenu.add(
                    {itemId:'asc',  text: this.sortAscText,  cls: 'xg-hmenu-sort-asc'},
                    {itemId:'desc', text: this.sortDescText, cls: 'xg-hmenu-sort-desc'}
                );

                if (grid.enableColumnHide !== false) {
                    this.colMenu = new Ext.menu.Menu({id:grid.id + '-hcols-menu'});
                    this.colMenu.on({
                        scope     : this,
                        beforeshow: this.beforeColMenuShow,
                        itemclick : this.handleHdMenuClick
                    });
                    this.hmenu.add('-', {
                        itemId:'columns',
                        hideOnClick: false,
                        text: this.columnsText,
                        menu: this.colMenu,
                        iconCls: 'x-cols-icon'
                    });
                }

                this.hmenu.on('itemclick', this.handleHdMenuClick, this);
            }

            if (grid.trackMouseOver) {
                this.mainBody.on({
                    scope    : this,
                    mouseover: this.onRowOver,
                    mouseout : this.onRowOut
                });
            }

            if (grid.enableDragDrop || grid.enableDrag) {
                this.dragZone = new Ext.grid.GridDragZone(grid, {
                    ddGroup : grid.ddGroup || 'GridDD'
                });
            }

            this.updateHeaderSortState();
        },

        /**
         * @private
         * Renders each of the UI elements in turn. This is called internally, once, by this.render. It does not
         * render rows from the store, just the surrounding UI elements.
         */
        renderUI : function() {
            var templates = this.templates;

            return templates.master.apply({
                body  : templates.body.apply({rows:' '}),
                header: this.renderHeaders(),
                ostyle: 'width:' + this.getOffsetWidth() + ';',
                bstyle: 'width:' + this.getTotalWidth()  + ';'
            });
        },

        // private
        processEvent : function(name, e) {
            var target = e.getTarget(),
                grid   = this.grid,
                header = this.findHeaderIndex(target),
                row, cell, col, body;

            grid.fireEvent(name, e);

            if (header !== false) {
                grid.fireEvent('header' + name, grid, header, e);
            } else {
                row = this.findRowIndex(target);

    //          Grid's value-added events must bubble correctly to allow cancelling via returning false: cell->column->row
    //          We must allow a return of false at any of these levels to cancel the event processing.
    //          Particularly allowing rowmousedown to be cancellable by prior handlers which need to prevent selection.
                if (row !== false) {
                    cell = this.findCellIndex(target);
                    if (cell !== false) {
                        col = grid.colModel.getColumnAt(cell);
                        if (grid.fireEvent('cell' + name, grid, row, cell, e) !== false) {
                            if (!col || (col.processEvent && (col.processEvent(name, e, grid, row, cell) !== false))) {
                                grid.fireEvent('row' + name, grid, row, e);
                            }
                        }
                    } else {
                        if (grid.fireEvent('row' + name, grid, row, e) !== false) {
                            (body = this.findRowBody(target)) && grid.fireEvent('rowbody' + name, grid, row, e);
                        }
                    }
                } else {
                    grid.fireEvent('container' + name, grid, e);
                }
            }
        },

        /**
         * @private
         * Sizes the grid's header and body elements
         */
        layout : function(initial) {
            if (!this.mainBody) {
                return; // not rendered
            }

            var grid       = this.grid,
                gridEl     = grid.getGridEl(),
                gridSize   = gridEl.getSize(true),
                gridWidth  = gridSize.width,
                gridHeight = gridSize.height,
                scroller   = this.scroller,
                scrollStyle, headerHeight, scrollHeight;

            if (gridWidth < 20 || gridHeight < 20) {
                return;
            }

            if (grid.autoHeight) {
                scrollStyle = scroller.dom.style;
                scrollStyle.overflow = 'visible';

                if (Ext.isWebKit) {
                    scrollStyle.position = 'static';
                }
            } else {
                this.el.setSize(gridWidth, gridHeight);

                headerHeight = this.mainHd.getHeight();
                scrollHeight = gridHeight - headerHeight;

                scroller.setSize(gridWidth, scrollHeight);

                if (this.innerHd) {
                    this.innerHd.style.width = (gridWidth) + "px";
                }
            }

            if (this.forceFit || (initial === true && this.autoFill)) {
                if (this.lastViewWidth != gridWidth) {
                    this.fitColumns(false, false);
                    this.lastViewWidth = gridWidth;
                }
            } else {
                this.autoExpand();
                this.syncHeaderScroll();
            }

            this.onLayout(gridWidth, scrollHeight);
        },

        // template functions for subclasses and plugins
        // these functions include precalculated values
        onLayout : function(vw, vh) {
            // do nothing
        },

        onColumnWidthUpdated : function(col, w, tw) {
            //template method
        },

        onAllColumnWidthsUpdated : function(ws, tw) {
            //template method
        },

        onColumnHiddenUpdated : function(col, hidden, tw) {
            // template method
        },

        updateColumnText : function(col, text) {
            // template method
        },

        afterMove : function(colIndex) {
            // template method
        },

        /* ----------------------------------- Core Specific -------------------------------------------*/
        // private
        init : function(grid) {
            this.grid = grid;

            this.initTemplates();
            this.initData(grid.store, grid.colModel);
            this.initUI(grid);
        },

        // private
        getColumnId : function(index){
            return this.cm.getColumnId(index);
        },

        // private
        getOffsetWidth : function() {
            return (this.cm.getTotalWidth() + this.getScrollOffset()) + 'px';
        },

        // private
        getScrollOffset: function() {
            return Ext.num(this.scrollOffset, Ext.getScrollBarWidth());
        },

        /**
         * @private
         * Renders the header row using the 'header' template. Does not inject the HTML into the DOM, just
         * returns a string.
         * @return {String} Rendered header row
         */
        renderHeaders : function() {
            var colModel   = this.cm,
                templates  = this.templates,
                headerTpl  = templates.hcell,
                properties = {},
                colCount   = colModel.getColumnCount(),
                last       = colCount - 1,
                cells      = [],
                i, cssCls;

            for (i = 0; i < colCount; i++) {
                if (i == 0) {
                    cssCls = 'x-grid3-cell-first ';
                } else {
                    cssCls = i == last ? 'x-grid3-cell-last ' : '';
                }

                properties = {
                    id     : colModel.getColumnId(i),
                    value  : colModel.getColumnHeader(i) || '',
                    style  : this.getColumnStyle(i, true),
                    css    : cssCls,
                    tooltip: this.getColumnTooltip(i)
                };

                if (colModel.config[i].align == 'right') {
                    properties.istyle = 'padding-right: 16px;';
                } else {
                    delete properties.istyle;
                }

                cells[i] = headerTpl.apply(properties);
            }

            return templates.header.apply({
                cells : cells.join(""),
                tstyle: String.format("width: {0};", this.getTotalWidth())
            });
        },

        /**
         * @private
         */
        getColumnTooltip : function(i) {
            var tooltip = this.cm.getColumnTooltip(i);
            if (tooltip) {
                if (Ext.QuickTips.isEnabled()) {
                    return 'ext:qtip="' + tooltip + '"';
                } else {
                    return 'title="' + tooltip + '"';
                }
            }

            return '';
        },

        // private
        beforeUpdate : function() {
            this.grid.stopEditing(true);
        },

        /**
         * @private
         * Re-renders the headers and ensures they are sized correctly
         */
        updateHeaders : function() {
            this.innerHd.firstChild.innerHTML = this.renderHeaders();

            this.updateHeaderWidth(false);
        },

        /**
         * @private
         * Ensures that the header is sized to the total width available to it
         * @param {Boolean} updateMain True to update the mainBody's width also (defaults to true)
         */
        updateHeaderWidth: function(updateMain) {
            var innerHdChild = this.innerHd.firstChild,
                totalWidth   = this.getTotalWidth();

            innerHdChild.style.width = this.getOffsetWidth();
            innerHdChild.firstChild.style.width = totalWidth;

            if (updateMain !== false) {
                this.mainBody.dom.style.width = totalWidth;
            }
        },

        /**
         * Focuses the specified row.
         * @param {Number} row The row index
         */
        focusRow : function(row) {
            this.focusCell(row, 0, false);
        },

        /**
         * Focuses the specified cell.
         * @param {Number} row The row index
         * @param {Number} col The column index
         */
        focusCell : function(row, col, hscroll) {
            this.syncFocusEl(this.ensureVisible(row, col, hscroll));

            var focusEl = this.focusEl;

            if (Ext.isGecko) {
                focusEl.focus();
            } else {
                focusEl.focus.defer(1, focusEl);
            }
        },

        /**
         * @private
         * Finds the Elements corresponding to the given row and column indexes
         */
        resolveCell : function(row, col, hscroll) {
            if (!Ext.isNumber(row)) {
                row = row.rowIndex;
            }

            if (!this.ds) {
                return null;
            }

            if (row < 0 || row >= this.ds.getCount()) {
                return null;
            }
            col = (col !== undefined ? col : 0);

            var rowEl    = this.getRow(row),
                colModel = this.cm,
                colCount = colModel.getColumnCount(),
                cellEl;

            if (!(hscroll === false && col === 0)) {
                while (col < colCount && colModel.isHidden(col)) {
                    col++;
                }

                cellEl = this.getCell(row, col);
            }

            return {row: rowEl, cell: cellEl};
        },

        /**
         * @private
         * Returns the XY co-ordinates of a given row/cell resolution (see {@link #resolveCell})
         * @return {Array} X and Y coords
         */
        getResolvedXY : function(resolved) {
            if (!resolved) {
                return null;
            }

            var cell = resolved.cell,
                row  = resolved.row;

            if (cell) {
                return Ext.fly(cell).getXY();
            } else {
                return [this.el.getX(), Ext.fly(row).getY()];
            }
        },

        /**
         * @private
         * Moves the focus element to the x and y co-ordinates of the given row and column
         */
        syncFocusEl : function(row, col, hscroll) {
            var xy = row;

            if (!Ext.isArray(xy)) {
                row = Math.min(row, Math.max(0, this.getRows().length-1));

                if (isNaN(row)) {
                    return;
                }

                xy = this.getResolvedXY(this.resolveCell(row, col, hscroll));
            }

            this.focusEl.setXY(xy || this.scroller.getXY());
        },

        /**
         * @private
         */
        ensureVisible : function(row, col, hscroll) {
            var resolved = this.resolveCell(row, col, hscroll);

            if (!resolved || !resolved.row) {
                return null;
            }

            var rowEl  = resolved.row,
                cellEl = resolved.cell,
                c = this.scroller.dom,
                p = rowEl,
                ctop = 0,
                stop = this.el.dom;

            while (p && p != stop) {
                ctop += p.offsetTop;
                p = p.offsetParent;
            }

            ctop -= this.mainHd.dom.offsetHeight;
            stop = parseInt(c.scrollTop, 10);

            var cbot = ctop + rowEl.offsetHeight,
                ch = c.clientHeight,
                sbot = stop + ch;

            if (ctop < stop) {
              c.scrollTop = ctop;
            } else if(cbot > sbot) {
                c.scrollTop = cbot-ch;
            }

            if (hscroll !== false) {
                var cleft  = parseInt(cellEl.offsetLeft, 10),
                    cright = cleft + cellEl.offsetWidth,
                    sleft  = parseInt(c.scrollLeft, 10),
                    sright = sleft + c.clientWidth;

                if (cleft < sleft) {
                    c.scrollLeft = cleft;
                } else if(cright > sright) {
                    c.scrollLeft = cright-c.clientWidth;
                }
            }

            return this.getResolvedXY(resolved);
        },

        // private
        insertRows : function(dm, firstRow, lastRow, isUpdate) {
            var last = dm.getCount() - 1;
            if( !isUpdate && firstRow === 0 && lastRow >= last) {
                this.fireEvent('beforerowsinserted', this, firstRow, lastRow);
                    this.refresh();
                this.fireEvent('rowsinserted', this, firstRow, lastRow);
            } else {
                if (!isUpdate) {
                    this.fireEvent('beforerowsinserted', this, firstRow, lastRow);
                }
                var html = this.renderRows(firstRow, lastRow),
                    before = this.getRow(firstRow);
                if (before) {
                    if(firstRow === 0){
                        Ext.fly(this.getRow(0)).removeClass(this.firstRowCls);
                    }
                    Ext.DomHelper.insertHtml('beforeBegin', before, html);
                } else {
                    var r = this.getRow(last - 1);
                    if(r){
                        Ext.fly(r).removeClass(this.lastRowCls);
                    }
                    Ext.DomHelper.insertHtml('beforeEnd', this.mainBody.dom, html);
                }
                if (!isUpdate) {
                    this.fireEvent('rowsinserted', this, firstRow, lastRow);
                    this.processRows(firstRow);
                } else if (firstRow === 0 || firstRow >= last) {
                    //ensure first/last row is kept after an update.
                    Ext.fly(this.getRow(firstRow)).addClass(firstRow === 0 ? this.firstRowCls : this.lastRowCls);
                }
            }
            this.syncFocusEl(firstRow);
        },

        /**
         * @private
         * DEPRECATED - this doesn't appear to be called anywhere in the library, remove in 4.0.
         */
        deleteRows : function(dm, firstRow, lastRow) {
            if (dm.getRowCount() < 1) {
                this.refresh();
            } else {
                this.fireEvent('beforerowsdeleted', this, firstRow, lastRow);

                this.removeRows(firstRow, lastRow);

                this.processRows(firstRow);
                this.fireEvent('rowsdeleted', this, firstRow, lastRow);
            }
        },

        /**
         * @private
         * Builds a CSS string for the given column index
         * @param {Number} colIndex The column index
         * @param {Boolean} isHeader True if getting the style for the column's header
         * @return {String} The CSS string
         */
        getColumnStyle : function(colIndex, isHeader) {
            var colModel  = this.cm,
                colConfig = colModel.config,
                style     = isHeader ? '' : colConfig[colIndex].css || '',
                align     = colConfig[colIndex].align;

            style += String.format("width: {0};", this.getColumnWidth(colIndex));

            if (colModel.isHidden(colIndex)) {
                style += 'display: none; ';
            }

            if (align) {
                style += String.format("text-align: {0};", align);
            }

            return style;
        },

        /**
         * @private
         * Returns the width of a given column minus its border width
         * @return {Number} The column index
         * @return {String|Number} The width in pixels
         */
        getColumnWidth : function(column) {
            var columnWidth = this.cm.getColumnWidth(column),
                borderWidth = this.borderWidth;

            if (Ext.isNumber(columnWidth)) {
                if (Ext.isBorderBox || (Ext.isWebKit && !Ext.isSafari2)) {
                    return columnWidth + "px";
                } else {
                    return Math.max(columnWidth - borderWidth, 0) + "px";
                }
            } else {
                return columnWidth;
            }
        },

        /**
         * @private
         * Returns the total width of all visible columns
         * @return {String}
         */
        getTotalWidth : function() {
            return this.cm.getTotalWidth() + 'px';
        },

        /**
         * @private
         * Resizes each column to fit the available grid width.
         * TODO: The second argument isn't even used, remove it in 4.0
         * @param {Boolean} preventRefresh True to prevent resizing of each row to the new column sizes (defaults to false)
         * @param {null} onlyExpand NOT USED, will be removed in 4.0
         * @param {Number} omitColumn The index of a column to leave at its current width. Defaults to undefined
         * @return {Boolean} True if the operation succeeded, false if not or undefined if the grid view is not yet initialized
         */
        fitColumns : function(preventRefresh, onlyExpand, omitColumn) {
            var grid          = this.grid,
                colModel      = this.cm,
                totalColWidth = colModel.getTotalWidth(false),
                gridWidth     = this.getGridInnerWidth(),
                extraWidth    = gridWidth - totalColWidth,
                columns       = [],
                extraCol      = 0,
                width         = 0,
                colWidth, fraction, i;

            // not initialized, so don't screw up the default widths
            if (gridWidth < 20 || extraWidth === 0) {
                return false;
            }

            var visibleColCount = colModel.getColumnCount(true),
                totalColCount   = colModel.getColumnCount(false),
                adjCount        = visibleColCount - (Ext.isNumber(omitColumn) ? 1 : 0);

            if (adjCount === 0) {
                adjCount = 1;
                omitColumn = undefined;
            }

            //FIXME: the algorithm used here is odd and potentially confusing. Includes this for loop and the while after it.
            for (i = 0; i < totalColCount; i++) {
                if (!colModel.isFixed(i) && i !== omitColumn) {
                    colWidth = colModel.getColumnWidth(i);
                    columns.push(i, colWidth);

                    if (!colModel.isHidden(i)) {
                        extraCol = i;
                        width += colWidth;
                    }
                }
            }

            fraction = (gridWidth - colModel.getTotalWidth()) / width;

            while (columns.length) {
                colWidth = columns.pop();
                i        = columns.pop();

                colModel.setColumnWidth(i, Math.max(grid.minColumnWidth, Math.floor(colWidth + colWidth * fraction)), true);
            }

            //this has been changed above so remeasure now
            totalColWidth = colModel.getTotalWidth(false);

            if (totalColWidth > gridWidth) {
                var adjustCol = (adjCount == visibleColCount) ? extraCol : omitColumn,
                    newWidth  = Math.max(1, colModel.getColumnWidth(adjustCol) - (totalColWidth - gridWidth));

                colModel.setColumnWidth(adjustCol, newWidth, true);
            }

            if (preventRefresh !== true) {
                this.updateAllColumnWidths();
            }

            return true;
        },

        /**
         * @private
         * Resizes the configured autoExpandColumn to take the available width after the other columns have
         * been accounted for
         * @param {Boolean} preventUpdate True to prevent the resizing of all rows (defaults to false)
         */
        autoExpand : function(preventUpdate) {
            var grid             = this.grid,
                colModel         = this.cm,
                gridWidth        = this.getGridInnerWidth(),
                totalColumnWidth = colModel.getTotalWidth(false),
                autoExpandColumn = grid.autoExpandColumn;

            if (!this.userResized && autoExpandColumn) {
                if (gridWidth != totalColumnWidth) {
                    //if we are not already using all available width, resize the autoExpandColumn
                    var colIndex     = colModel.getIndexById(autoExpandColumn),
                        currentWidth = colModel.getColumnWidth(colIndex),
                        desiredWidth = gridWidth - totalColumnWidth + currentWidth,
                        newWidth     = Math.min(Math.max(desiredWidth, grid.autoExpandMin), grid.autoExpandMax);

                    if (currentWidth != newWidth) {
                        colModel.setColumnWidth(colIndex, newWidth, true);

                        if (preventUpdate !== true) {
                            this.updateColumnWidth(colIndex, newWidth);
                        }
                    }
                }
            }
        },

        /**
         * Returns the total internal width available to the grid, taking the scrollbar into account
         * @return {Number} The total width
         */
        getGridInnerWidth: function() {
            return this.grid.getGridEl().getWidth(true) - this.getScrollOffset();
        },

        /**
         * @private
         * Returns an array of column configurations - one for each column
         * @return {Array} Array of column config objects. This includes the column name, renderer, id style and renderer
         */
        getColumnData : function() {
            var columns  = [],
                colModel = this.cm,
                colCount = colModel.getColumnCount(),
                fields   = this.ds.fields,
                i, name;

            for (i = 0; i < colCount; i++) {
                name = colModel.getDataIndex(i);

                columns[i] = {
                    name    : Ext.isDefined(name) ? name : (fields.get(i) ? fields.get(i).name : undefined),
                    renderer: colModel.getRenderer(i),
                    scope   : colModel.getRendererScope(i),
                    id      : colModel.getColumnId(i),
                    style   : this.getColumnStyle(i)
                };
            }

            return columns;
        },

        /**
         * @private
         * Renders rows between start and end indexes
         * @param {Number} startRow Index of the first row to render
         * @param {Number} endRow Index of the last row to render
         */
        renderRows : function(startRow, endRow) {
            var grid     = this.grid,
                store    = grid.store,
                stripe   = grid.stripeRows,
                colModel = grid.colModel,
                colCount = colModel.getColumnCount(),
                rowCount = store.getCount(),
                records;

            if (rowCount < 1) {
                return '';
            }

            startRow = startRow || 0;
            endRow   = Ext.isDefined(endRow) ? endRow : rowCount - 1;
            records  = store.getRange(startRow, endRow);

            return this.doRender(this.getColumnData(), records, store, startRow, colCount, stripe);
        },

        // private
        renderBody : function(){
            var markup = this.renderRows() || ' ';
            return this.templates.body.apply({rows: markup});
        },

        /**
         * @private
         * Refreshes a row by re-rendering it. Fires the rowupdated event when done
         */
        refreshRow: function(record) {
            var store     = this.ds,
                colCount  = this.cm.getColumnCount(),
                columns   = this.getColumnData(),
                last      = colCount - 1,
                cls       = ['x-grid3-row'],
                rowParams = {
                    tstyle: String.format("width: {0};", this.getTotalWidth())
                },
                colBuffer = [],
                cellTpl   = this.templates.cell,
                rowIndex, row, column, meta, css, i;

            if (Ext.isNumber(record)) {
                rowIndex = record;
                record   = store.getAt(rowIndex);
            } else {
                rowIndex = store.indexOf(record);
            }

            //the record could not be found
            if (!record || rowIndex < 0) {
                return;
            }

            //builds each column in this row
            for (i = 0; i < colCount; i++) {
                column = columns[i];

                if (i == 0) {
                    css = 'x-grid3-cell-first';
                } else {
                    css = (i == last) ? 'x-grid3-cell-last ' : '';
                }

                meta = {
                    id      : column.id,
                    style   : column.style,
                    css     : css,
                    attr    : "",
                    cellAttr: ""
                };
                // Need to set this after, because we pass meta to the renderer
                meta.value = column.renderer.call(column.scope, record.data[column.name], meta, record, rowIndex, i, store);

                if (Ext.isEmpty(meta.value)) {
                    meta.value = ' ';
                }

                if (this.markDirty && record.dirty && typeof record.modified[column.name] != 'undefined') {
                    meta.css += ' x-grid3-dirty-cell';
                }

                colBuffer[i] = cellTpl.apply(meta);
            }

            row = this.getRow(rowIndex);
            row.className = '';

            if (this.grid.stripeRows && ((rowIndex + 1) % 2 === 0)) {
                cls.push('x-grid3-row-alt');
            }

            if (this.getRowClass) {
                rowParams.cols = colCount;
                cls.push(this.getRowClass(record, rowIndex, rowParams, store));
            }

            this.fly(row).addClass(cls).setStyle(rowParams.tstyle);
            rowParams.cells = colBuffer.join("");
            row.innerHTML = this.templates.rowInner.apply(rowParams);

            this.fireEvent('rowupdated', this, rowIndex, record);
        },

        /**
         * Refreshs the grid UI
         * @param {Boolean} headersToo (optional) True to also refresh the headers
         */
        refresh : function(headersToo) {
            this.fireEvent('beforerefresh', this);
            this.grid.stopEditing(true);

            var result = this.renderBody();
            this.mainBody.update(result).setWidth(this.getTotalWidth());
            if (headersToo === true) {
                this.updateHeaders();
                this.updateHeaderSortState();
            }
            this.processRows(0, true);
            this.layout();
            this.applyEmptyText();
            this.fireEvent('refresh', this);
        },

        /**
         * @private
         * Displays the configured emptyText if there are currently no rows to display
         */
        applyEmptyText : function() {
            if (this.emptyText && !this.hasRows()) {
                this.mainBody.update('' + this.emptyText + '');
            }
        },

        /**
         * @private
         * Adds sorting classes to the column headers based on the bound store's sortInfo. Fires the 'sortchange' event
         * if the sorting has changed since this function was last run.
         */
        updateHeaderSortState : function() {
            var state = this.ds.getSortState();
            if (!state) {
                return;
            }

            if (!this.sortState || (this.sortState.field != state.field || this.sortState.direction != state.direction)) {
                this.grid.fireEvent('sortchange', this.grid, state);
            }

            this.sortState = state;

            var sortColumn = this.cm.findColumnIndex(state.field);
            if (sortColumn != -1) {
                var sortDir = state.direction;
                this.updateSortIcon(sortColumn, sortDir);
            }
        },

        /**
         * @private
         * Removes any sorting indicator classes from the column headers
         */
        clearHeaderSortState : function() {
            if (!this.sortState) {
                return;
            }
            this.grid.fireEvent('sortchange', this.grid, null);
            this.mainHd.select('td').removeClass(this.sortClasses);
            delete this.sortState;
        },

        /**
         * @private
         * Destroys all objects associated with the GridView
         */
        destroy : function() {
            var me              = this,
                grid            = me.grid,
                gridEl          = grid.getGridEl(),
                dragZone        = me.dragZone,
                splitZone       = me.splitZone,
                columnDrag      = me.columnDrag,
                columnDrop      = me.columnDrop,
                scrollToTopTask = me.scrollToTopTask,
                columnDragData,
                columnDragProxy;

            if (scrollToTopTask && scrollToTopTask.cancel) {
                scrollToTopTask.cancel();
            }

            Ext.destroyMembers(me, 'colMenu', 'hmenu');

            me.initData(null, null);
            me.purgeListeners();

            Ext.fly(me.innerHd).un("click", me.handleHdDown, me);

            if (grid.enableColumnMove) {
                columnDragData = columnDrag.dragData;
                columnDragProxy = columnDrag.proxy;
                Ext.destroy(
                    columnDrag.el,
                    columnDragProxy.ghost,
                    columnDragProxy.el,
                    columnDrop.el,
                    columnDrop.proxyTop,
                    columnDrop.proxyBottom,
                    columnDragData.ddel,
                    columnDragData.header
                );

                if (columnDragProxy.anim) {
                    Ext.destroy(columnDragProxy.anim);
                }

                delete columnDragProxy.ghost;
                delete columnDragData.ddel;
                delete columnDragData.header;
                columnDrag.destroy();

                delete Ext.dd.DDM.locationCache[columnDrag.id];
                delete columnDrag._domRef;

                delete columnDrop.proxyTop;
                delete columnDrop.proxyBottom;
                columnDrop.destroy();
                delete Ext.dd.DDM.locationCache["gridHeader" + gridEl.id];
                delete columnDrop._domRef;
                delete Ext.dd.DDM.ids[columnDrop.ddGroup];
            }

            if (splitZone) { // enableColumnResize
                splitZone.destroy();
                delete splitZone._domRef;
                delete Ext.dd.DDM.ids["gridSplitters" + gridEl.id];
            }

            Ext.fly(me.innerHd).removeAllListeners();
            Ext.removeNode(me.innerHd);
            delete me.innerHd;

            Ext.destroy(
                me.el,
                me.mainWrap,
                me.mainHd,
                me.scroller,
                me.mainBody,
                me.focusEl,
                me.resizeMarker,
                me.resizeProxy,
                me.activeHdBtn,
                me._flyweight,
                dragZone,
                splitZone
            );

            delete grid.container;

            if (dragZone) {
                dragZone.destroy();
            }

            Ext.dd.DDM.currentTarget = null;
            delete Ext.dd.DDM.locationCache[gridEl.id];

            Ext.EventManager.removeResizeListener(me.onWindowResize, me);
        },

        // private
        onDenyColumnHide : function() {

        },

        // private
        render : function() {
            if (this.autoFill) {
                var ct = this.grid.ownerCt;

                if (ct && ct.getLayout()) {
                    ct.on('afterlayout', function() {
                        this.fitColumns(true, true);
                        this.updateHeaders();
                        this.updateHeaderSortState();
                    }, this, {single: true});
                }
            } else if (this.forceFit) {
                this.fitColumns(true, false);
            } else if (this.grid.autoExpandColumn) {
                this.autoExpand(true);
            }

            this.grid.getGridEl().dom.innerHTML = this.renderUI();

            this.afterRenderUI();
        },

        /* --------------------------------- Model Events and Handlers --------------------------------*/

        /**
         * @private
         * Binds a new Store and ColumnModel to this GridView. Removes any listeners from the old objects (if present)
         * and adds listeners to the new ones
         * @param {Ext.data.Store} newStore The new Store instance
         * @param {Ext.grid.ColumnModel} newColModel The new ColumnModel instance
         */
        initData : function(newStore, newColModel) {
            var me = this;

            if (me.ds) {
                var oldStore = me.ds;

                oldStore.un('add', me.onAdd, me);
                oldStore.un('load', me.onLoad, me);
                oldStore.un('clear', me.onClear, me);
                oldStore.un('remove', me.onRemove, me);
                oldStore.un('update', me.onUpdate, me);
                oldStore.un('datachanged', me.onDataChange, me);

                if (oldStore !== newStore && oldStore.autoDestroy) {
                    oldStore.destroy();
                }
            }

            if (newStore) {
                newStore.on({
                    scope      : me,
                    load       : me.onLoad,
                    add        : me.onAdd,
                    remove     : me.onRemove,
                    update     : me.onUpdate,
                    clear      : me.onClear,
                    datachanged: me.onDataChange
                });
            }

            if (me.cm) {
                var oldColModel = me.cm;

                oldColModel.un('configchange', me.onColConfigChange, me);
                oldColModel.un('widthchange',  me.onColWidthChange, me);
                oldColModel.un('headerchange', me.onHeaderChange, me);
                oldColModel.un('hiddenchange', me.onHiddenChange, me);
                oldColModel.un('columnmoved',  me.onColumnMove, me);
            }

            if (newColModel) {
                delete me.lastViewWidth;

                newColModel.on({
                    scope       : me,
                    configchange: me.onColConfigChange,
                    widthchange : me.onColWidthChange,
                    headerchange: me.onHeaderChange,
                    hiddenchange: me.onHiddenChange,
                    columnmoved : me.onColumnMove
                });
            }

            me.ds = newStore;
            me.cm = newColModel;
        },

        // private
        onDataChange : function(){
            this.refresh(true);
            this.updateHeaderSortState();
            this.syncFocusEl(0);
        },

        // private
        onClear : function() {
            this.refresh();
            this.syncFocusEl(0);
        },

        // private
        onUpdate : function(store, record) {
            this.refreshRow(record);
        },

        // private
        onAdd : function(store, records, index) {
            this.insertRows(store, index, index + (records.length-1));
        },

        // private
        onRemove : function(store, record, index, isUpdate) {
            if (isUpdate !== true) {
                this.fireEvent('beforerowremoved', this, index, record);
            }

            this.removeRow(index);

            if (isUpdate !== true) {
                this.processRows(index);
                this.applyEmptyText();
                this.fireEvent('rowremoved', this, index, record);
            }
        },

        /**
         * @private
         * Called when a store is loaded, scrolls to the top row
         */
        onLoad : function() {
            if (Ext.isGecko) {
                if (!this.scrollToTopTask) {
                    this.scrollToTopTask = new Ext.util.DelayedTask(this.scrollToTop, this);
                }
                this.scrollToTopTask.delay(1);
            } else {
                this.scrollToTop();
            }
        },

        // private
        onColWidthChange : function(cm, col, width) {
            this.updateColumnWidth(col, width);
        },

        // private
        onHeaderChange : function(cm, col, text) {
            this.updateHeaders();
        },

        // private
        onHiddenChange : function(cm, col, hidden) {
            this.updateColumnHidden(col, hidden);
        },

        // private
        onColumnMove : function(cm, oldIndex, newIndex) {
            this.indexMap = null;
            this.refresh(true);
            this.restoreScroll(this.getScrollState());

            this.afterMove(newIndex);
            this.grid.fireEvent('columnmove', oldIndex, newIndex);
        },

        // private
        onColConfigChange : function() {
            delete this.lastViewWidth;
            this.indexMap = null;
            this.refresh(true);
        },

        /* -------------------- UI Events and Handlers ------------------------------ */
        // private
        initUI : function(grid) {
            grid.on('headerclick', this.onHeaderClick, this);
        },

        // private
        initEvents : Ext.emptyFn,

        // private
        onHeaderClick : function(g, index) {
            if (this.headersDisabled || !this.cm.isSortable(index)) {
                return;
            }
            g.stopEditing(true);
            g.store.sort(this.cm.getDataIndex(index));
        },

        /**
         * @private
         * Adds the hover class to a row when hovered over
         */
        onRowOver : function(e, target) {
            var row = this.findRowIndex(target);

            if (row !== false) {
                this.addRowClass(row, this.rowOverCls);
            }
        },

        /**
         * @private
         * Removes the hover class from a row on mouseout
         */
        onRowOut : function(e, target) {
            var row = this.findRowIndex(target);

            if (row !== false && !e.within(this.getRow(row), true)) {
                this.removeRowClass(row, this.rowOverCls);
            }
        },

        // private
        onRowSelect : function(row) {
            this.addRowClass(row, this.selectedRowClass);
        },

        // private
        onRowDeselect : function(row) {
            this.removeRowClass(row, this.selectedRowClass);
        },

        // private
        onCellSelect : function(row, col) {
            var cell = this.getCell(row, col);
            if (cell) {
                this.fly(cell).addClass('x-grid3-cell-selected');
            }
        },

        // private
        onCellDeselect : function(row, col) {
            var cell = this.getCell(row, col);
            if (cell) {
                this.fly(cell).removeClass('x-grid3-cell-selected');
            }
        },

        // private
        handleWheel : function(e) {
            e.stopPropagation();
        },

        /**
         * @private
         * Called by the SplitDragZone when a drag has been completed. Resizes the columns
         */
        onColumnSplitterMoved : function(cellIndex, width) {
            this.userResized = true;
            this.grid.colModel.setColumnWidth(cellIndex, width, true);

            if (this.forceFit) {
                this.fitColumns(true, false, cellIndex);
                this.updateAllColumnWidths();
            } else {
                this.updateColumnWidth(cellIndex, width);
                this.syncHeaderScroll();
            }

            this.grid.fireEvent('columnresize', cellIndex, width);
        },

        /**
         * @private
         * Click handler for the shared column dropdown menu, called on beforeshow. Builds the menu
         * which displays the list of columns for the user to show or hide.
         */
        beforeColMenuShow : function() {
            var colModel = this.cm,
                colCount = colModel.getColumnCount(),
                colMenu  = this.colMenu,
                i;

            colMenu.removeAll();

            for (i = 0; i < colCount; i++) {
                if (colModel.config[i].hideable !== false) {
                    colMenu.add(new Ext.menu.CheckItem({
                        text       : colModel.getColumnHeader(i),
                        itemId     : 'col-' + colModel.getColumnId(i),
                        checked    : !colModel.isHidden(i),
                        disabled   : colModel.config[i].hideable === false,
                        hideOnClick: false
                    }));
                }
            }
        },

        /**
         * @private
         * Attached as the 'itemclick' handler to the header menu and the column show/hide submenu (if available).
         * Performs sorting if the sorter buttons were clicked, otherwise hides/shows the column that was clicked.
         */
        handleHdMenuClick : function(item) {
            var store     = this.ds,
                dataIndex = this.cm.getDataIndex(this.hdCtxIndex);

            switch (item.getItemId()) {
                case 'asc':
                    store.sort(dataIndex, 'ASC');
                    break;
                case 'desc':
                    store.sort(dataIndex, 'DESC');
                    break;
                default:
                    this.handleHdMenuClickDefault(item);
            }
            return true;
        },

        /**
         * Called by handleHdMenuClick if any button except a sort ASC/DESC button was clicked. The default implementation provides
         * the column hide/show functionality based on the check state of the menu item. A different implementation can be provided
         * if needed.
         * @param {Ext.menu.BaseItem} item The menu item that was clicked
         */
        handleHdMenuClickDefault: function(item) {
            var colModel = this.cm,
                itemId   = item.getItemId(),
                index    = colModel.getIndexById(itemId.substr(4));

            if (index != -1) {
                if (item.checked && colModel.getColumnsBy(this.isHideableColumn, this).length <= 1) {
                    this.onDenyColumnHide();
                    return;
                }
                colModel.setHidden(index, item.checked);
            }
        },

        /**
         * @private
         * Called when a header cell is clicked - shows the menu if the click happened over a trigger button
         */
        handleHdDown : function(e, target) {
            if (Ext.fly(target).hasClass('x-grid3-hd-btn')) {
                e.stopEvent();

                var colModel  = this.cm,
                    header    = this.findHeaderCell(target),
                    index     = this.getCellIndex(header),
                    sortable  = colModel.isSortable(index),
                    menu      = this.hmenu,
                    menuItems = menu.items,
                    menuCls   = this.headerMenuOpenCls;

                this.hdCtxIndex = index;

                Ext.fly(header).addClass(menuCls);
                menuItems.get('asc').setDisabled(!sortable);
                menuItems.get('desc').setDisabled(!sortable);

                menu.on('hide', function() {
                    Ext.fly(header).removeClass(menuCls);
                }, this, {single:true});

                menu.show(target, 'tl-bl?');
            }
        },

        /**
         * @private
         * Attached to the headers' mousemove event. This figures out the CSS cursor to use based on where the mouse is currently
         * pointed. If the mouse is currently hovered over the extreme left or extreme right of any header cell and the cell next
         * to it is resizable it is given the resize cursor, otherwise the cursor is set to an empty string.
         */
        handleHdMove : function(e) {
            var header = this.findHeaderCell(this.activeHdRef);

            if (header && !this.headersDisabled) {
                var handleWidth  = this.splitHandleWidth || 5,
                    activeRegion = this.activeHdRegion,
                    headerStyle  = header.style,
                    colModel     = this.cm,
                    cursor       = '',
                    pageX        = e.getPageX();

                if (this.grid.enableColumnResize !== false) {
                    var activeHeaderIndex = this.activeHdIndex,
                        previousVisible   = this.getPreviousVisible(activeHeaderIndex),
                        currentResizable  = colModel.isResizable(activeHeaderIndex),
                        previousResizable = previousVisible && colModel.isResizable(previousVisible),
                        inLeftResizer     = pageX - activeRegion.left <= handleWidth,
                        inRightResizer    = activeRegion.right - pageX <= (!this.activeHdBtn ? handleWidth : 2);

                    if (inLeftResizer && previousResizable) {
                        cursor = Ext.isAir ? 'move' : Ext.isWebKit ? 'e-resize' : 'col-resize'; // col-resize not always supported
                    } else if (inRightResizer && currentResizable) {
                        cursor = Ext.isAir ? 'move' : Ext.isWebKit ? 'w-resize' : 'col-resize';
                    }
                }

                headerStyle.cursor = cursor;
            }
        },

        /**
         * @private
         * Returns the index of the nearest currently visible header to the left of the given index.
         * @param {Number} index The header index
         * @return {Number/undefined} The index of the nearest visible header
         */
        getPreviousVisible: function(index) {
            while (index > 0) {
                if (!this.cm.isHidden(index - 1)) {
                    return index;
                }
                index--;
            }
            return undefined;
        },

        /**
         * @private
         * Tied to the header element's mouseover event - adds the over class to the header cell if the menu is not disabled
         * for that cell
         */
        handleHdOver : function(e, target) {
            var header = this.findHeaderCell(target);

            if (header && !this.headersDisabled) {
                var fly = this.fly(header);

                this.activeHdRef = target;
                this.activeHdIndex = this.getCellIndex(header);
                this.activeHdRegion = fly.getRegion();

                if (!this.isMenuDisabled(this.activeHdIndex, fly)) {
                    fly.addClass('x-grid3-hd-over');
                    this.activeHdBtn = fly.child('.x-grid3-hd-btn');

                    if (this.activeHdBtn) {
                        this.activeHdBtn.dom.style.height = (header.firstChild.offsetHeight - 1) + 'px';
                    }
                }
            }
        },

        /**
         * @private
         * Tied to the header element's mouseout event. Removes the hover class from the header cell
         */
        handleHdOut : function(e, target) {
            var header = this.findHeaderCell(target);

            if (header && (!Ext.isIE || !e.within(header, true))) {
                this.activeHdRef = null;
                this.fly(header).removeClass('x-grid3-hd-over');
                header.style.cursor = '';
            }
        },

        /**
         * @private
         * Used by {@link #handleHdOver} to determine whether or not to show the header menu class on cell hover
         * @param {Number} cellIndex The header cell index
         * @param {Ext.Element} el The cell element currently being hovered over
         */
        isMenuDisabled: function(cellIndex, el) {
            return this.cm.isMenuDisabled(cellIndex);
        },

        /**
         * @private
         * Returns true if there are any rows rendered into the GridView
         * @return {Boolean} True if any rows have been rendered
         */
        hasRows : function() {
            var fc = this.mainBody.dom.firstChild;
            return fc && fc.nodeType == 1 && fc.className != 'x-grid-empty';
        },

        /**
         * @private
         */
        isHideableColumn : function(c) {
            return !c.hidden;
        },

        /**
         * @private
         * DEPRECATED - will be removed in Ext JS 5.0
         */
        bind : function(d, c) {
            this.initData(d, c);
        }
    });

    // private
    // This is a support class used internally by the Grid components
    Ext.grid.GridView.SplitDragZone = Ext.extend(Ext.dd.DDProxy, {

        constructor: function(grid, hd){
            this.grid = grid;
            this.view = grid.getView();
            this.marker = this.view.resizeMarker;
            this.proxy = this.view.resizeProxy;
            Ext.grid.GridView.SplitDragZone.superclass.constructor.call(this, hd,
                'gridSplitters' + this.grid.getGridEl().id, {
                dragElId : Ext.id(this.proxy.dom), resizeFrame:false
            });
            this.scroll = false;
            this.hw = this.view.splitHandleWidth || 5;
        },

        b4StartDrag : function(x, y){
            this.dragHeadersDisabled = this.view.headersDisabled;
            this.view.headersDisabled = true;
            var h = this.view.mainWrap.getHeight();
            this.marker.setHeight(h);
            this.marker.show();
            this.marker.alignTo(this.view.getHeaderCell(this.cellIndex), 'tl-tl', [-2, 0]);
            this.proxy.setHeight(h);
            var w = this.cm.getColumnWidth(this.cellIndex),
                minw = Math.max(w-this.grid.minColumnWidth, 0);
            this.resetConstraints();
            this.setXConstraint(minw, 1000);
            this.setYConstraint(0, 0);
            this.minX = x - minw;
            this.maxX = x + 1000;
            this.startPos = x;
            Ext.dd.DDProxy.prototype.b4StartDrag.call(this, x, y);
        },

        allowHeaderDrag : function(e){
            return true;
        },

        handleMouseDown : function(e){
            var t = this.view.findHeaderCell(e.getTarget());
            if(t && this.allowHeaderDrag(e)){
                var xy = this.view.fly(t).getXY(),
                    x = xy[0],
                    exy = e.getXY(),
                    ex = exy[0],
                    w = t.offsetWidth,
                    adjust = false;

                if((ex - x) <= this.hw){
                    adjust = -1;
                }else if((x+w) - ex <= this.hw){
                    adjust = 0;
                }
                if(adjust !== false){
                    this.cm = this.grid.colModel;
                    var ci = this.view.getCellIndex(t);
                    if(adjust == -1){
                      if (ci + adjust < 0) {
                        return;
                      }
                        while(this.cm.isHidden(ci+adjust)){
                            --adjust;
                            if(ci+adjust < 0){
                                return;
                            }
                        }
                    }
                    this.cellIndex = ci+adjust;
                    this.split = t.dom;
                    if(this.cm.isResizable(this.cellIndex) && !this.cm.isFixed(this.cellIndex)){
                        Ext.grid.GridView.SplitDragZone.superclass.handleMouseDown.apply(this, arguments);
                    }
                }else if(this.view.columnDrag){
                    this.view.columnDrag.callHandleMouseDown(e);
                }
            }
        },

        endDrag : function(e){
            this.marker.hide();
            var v = this.view,
                endX = Math.max(this.minX, e.getPageX()),
                diff = endX - this.startPos,
                disabled = this.dragHeadersDisabled;

            v.onColumnSplitterMoved(this.cellIndex, this.cm.getColumnWidth(this.cellIndex)+diff);
            setTimeout(function(){
                v.headersDisabled = disabled;
            }, 50);
        },

        autoOffset : function(){
            this.setDelta(0,0);
        }
    });