    /**
     * @author Aaron Conran
     * @class Ext.grid.Panel
     * @extends Ext.panel.Table
     *
     * Grids are an excellent way of showing large amounts of tabular data on the client side. Essentially a supercharged
     * `<table>`, GridPanel makes it easy to fetch, sort and filter large amounts of data.
     *
     * Grids are composed of 2 main pieces - a {@link Ext.data.Store Store} full of data and a set of columns to render.
     *
     * {@img Ext.grid.Panel/Ext.grid.Panel1.png Ext.grid.Panel component}
     *
     * ## Basic GridPanel
     *
     *     Ext.create('Ext.data.Store', {
     *         storeId:'simpsonsStore',
     *         fields:['name', 'email', 'phone'],
     *         data:{'items':[
     *             {"name":"Lisa", "email":"lisa@simpsons.com", "phone":"555-111-1224"},
     *             {"name":"Bart", "email":"bart@simpsons.com", "phone":"555--222-1234"},
     *             {"name":"Homer", "email":"home@simpsons.com", "phone":"555-222-1244"},
     *             {"name":"Marge", "email":"marge@simpsons.com", "phone":"555-222-1254"}
     *         ]},
     *         proxy: {
     *             type: 'memory',
     *             reader: {
     *                 type: 'json',
     *                 root: 'items'
     *             }
     *         }
     *     });
     *
     *     Ext.create('Ext.grid.Panel', {
     *         title: 'Simpsons',
     *         store: Ext.data.StoreManager.lookup('simpsonsStore'),
     *         columns: [
     *             {header: 'Name',  dataIndex: 'name'},
     *             {header: 'Email', dataIndex: 'email', flex:1},
     *             {header: 'Phone', dataIndex: 'phone'}
     *         ],
     *         height: 200,
     *         width: 400,
     *         renderTo: Ext.getBody()
     *     });
     *
     * The code above produces a simple grid with three columns. We specified a Store which will load JSON data inline.
     * In most apps we would be placing the grid inside another container and wouldn't need to use the
     * {@link #height}, {@link #width} and {@link #renderTo} configurations but they are included here to make it easy to get
     * up and running.
     *
     * The grid we created above will contain a header bar with a title ('Simpsons'), a row of column headers directly underneath
     * and finally the grid rows under the headers.
     *
     * ## Configuring columns
     *
     * By default, each column is sortable and will toggle between ASC and DESC sorting when you click on its header. Each
     * column header is also reorderable by default, and each gains a drop-down menu with options to hide and show columns.
     * It's easy to configure each column - here we use the same example as above and just modify the columns config:
     *
     *     columns: [
     *         {
     *             header: 'Name',
     *             dataIndex: 'name',
     *             sortable: false,
     *             hideable: false,
     *             flex: 1
     *         },
     *         {
     *             header: 'Email',
     *             dataIndex: 'email',
     *             hidden: true
     *         },
     *         {
     *             header: 'Phone',
     *             dataIndex: 'phone',
     *             width: 100
     *         }
     *     ]
     *
     * We turned off sorting and hiding on the 'Name' column so clicking its header now has no effect. We also made the Email
     * column hidden by default (it can be shown again by using the menu on any other column). We also set the Phone column to
     * a fixed with of 100px and flexed the Name column, which means it takes up all remaining width after the other columns
     * have been accounted for. See the {@link Ext.grid.column.Column column docs} for more details.
     *
     * ## Renderers
     *
     * As well as customizing columns, it's easy to alter the rendering of individual cells using renderers. A renderer is
     * tied to a particular column and is passed the value that would be rendered into each cell in that column. For example,
     * we could define a renderer function for the email column to turn each email address into a mailto link:
     *
     *     columns: [
     *         {
     *             header: 'Email',
     *             dataIndex: 'email',
     *             renderer: function(value) {
     *                 return Ext.String.format('<a href="mailto:{0}">{1}</a>', value, value);
     *             }
     *         }
     *     ]
     *
     * See the {@link Ext.grid.column.Column column docs} for more information on renderers.
     *
     * ## Selection Models
     *
     * Sometimes all you want is to render data onto the screen for viewing, but usually it's necessary to interact with or
     * update that data. Grids use a concept called a Selection Model, which is simply a mechanism for selecting some part of
     * the data in the grid. The two main types of Selection Model are RowSelectionModel, where entire rows are selected, and
     * CellSelectionModel, where individual cells are selected.
     *
     * Grids use a Row Selection Model by default, but this is easy to customise like so:
     *
     *     Ext.create('Ext.grid.Panel', {
     *         selType: 'cellmodel',
     *         store: ...
     *     });
     *
     * Specifying the `cellmodel` changes a couple of things. Firstly, clicking on a cell now
     * selects just that cell (using a {@link Ext.selection.RowModel rowmodel} will select the entire row), and secondly the
     * keyboard navigation will walk from cell to cell instead of row to row. Cell-based selection models are usually used in
     * conjunction with editing.
     *
     * {@img Ext.grid.Panel/Ext.grid.Panel2.png Ext.grid.Panel cell editing}
     *
     * ## Editing
     *
     * Grid has built-in support for in-line editing. There are two chief editing modes - cell editing and row editing. Cell
     * editing is easy to add to your existing column setup - here we'll just modify the example above to include an editor
     * on both the name and the email columns:
     *
     *     Ext.create('Ext.grid.Panel', {
     *         title: 'Simpsons',
     *         store: Ext.data.StoreManager.lookup('simpsonsStore'),
     *         columns: [
     *             {header: 'Name',  dataIndex: 'name', field: 'textfield'},
     *             {header: 'Email', dataIndex: 'email', flex:1,
     *                 field:{
     *                     xtype:'textfield',
     *                     allowBlank:false
     *                 }
     *             },
     *             {header: 'Phone', dataIndex: 'phone'}
     *         ],
     *         selType: 'cellmodel',
     *         plugins: [
     *             Ext.create('Ext.grid.plugin.CellEditing', {
     *                 clicksToEdit: 1
     *             })
     *         ],
     *         height: 200,
     *         width: 400,
     *         renderTo: Ext.getBody()
     *     });
     *
     * This requires a little explanation. We're passing in {@link #store store} and {@link #columns columns} as normal, but
     * this time we've also specified a {@link #field field} on two of our columns. For the Name column we just want a default
     * textfield to edit the value, so we specify 'textfield'. For the Email column we customized the editor slightly by
     * passing allowBlank: false, which will provide inline validation.
     *
     * To support cell editing, we also specified that the grid should use the 'cellmodel' {@link #selType}, and created an
     * instance of the {@link Ext.grid.plugin.CellEditing CellEditing plugin}, which we configured to activate each editor after a
     * single click.
     *
     * {@img Ext.grid.Panel/Ext.grid.Panel3.png Ext.grid.Panel row editing}
     *
     * ## Row Editing
     *
     * The other type of editing is row-based editing, using the RowEditor component. This enables you to edit an entire row
     * at a time, rather than editing cell by cell. Row Editing works in exactly the same way as cell editing, all we need to
     * do is change the plugin type to {@link Ext.grid.plugin.RowEditing}, and set the selType to 'rowmodel':
     *
     *     Ext.create('Ext.grid.Panel', {
     *         title: 'Simpsons',
     *         store: Ext.data.StoreManager.lookup('simpsonsStore'),
     *         columns: [
     *             {header: 'Name',  dataIndex: 'name', field: 'textfield'},
     *             {header: 'Email', dataIndex: 'email', flex:1,
     *                 field:{
     *                     xtype:'textfield',
     *                     allowBlank:false
     *                 }
     *             },
     *             {header: 'Phone', dataIndex: 'phone'}
     *         ],
     *         selType: 'rowmodel',
     *         plugins: [
     *             Ext.create('Ext.grid.plugin.RowEditing', {
     *                 clicksToEdit: 1
     *             })
     *         ],
     *         height: 200,
     *         width: 400,
     *         renderTo: Ext.getBody()
     *     });
     *
     * Again we passed some configuration to our {@link Ext.grid.plugin.RowEditing} plugin, and now when we click each row a row
     * editor will appear and enable us to edit each of the columns we have specified an editor for.
     *
     * ## Sorting & Filtering
     *
     * Every grid is attached to a {@link Ext.data.Store Store}, which provides multi-sort and filtering capabilities. It's
     * easy to set up a grid to be sorted from the start:
     *
     *     var myGrid = Ext.create('Ext.grid.Panel', {
     *         store: {
     *             fields: ['name', 'email', 'phone'],
     *             sorters: ['name', 'phone']
     *         },
     *         columns: [
     *             {text: 'Name',  dataIndex: 'name'},
     *             {text: 'Email', dataIndex: 'email'}
     *         ]
     *     });
     *
     * Sorting at run time is easily accomplished by simply clicking each column header. If you need to perform sorting on
     * more than one field at run time it's easy to do so by adding new sorters to the store:
     *
     *     myGrid.store.sort([
     *         {property: 'name',  direction: 'ASC'},
     *         {property: 'email', direction: 'DESC'},
     *     ]);
     *
     * {@img Ext.grid.Panel/Ext.grid.Panel4.png Ext.grid.Panel grouping}
     *
     * ## Grouping
     *
     * Grid supports the grouping of rows by any field. For example if we had a set of employee records, we might want to
     * group by the department that each employee works in. Here's how we might set that up:
     *
     *     var store = Ext.create('Ext.data.Store', {
     *         storeId:'employeeStore',
     *         fields:['name', 'senority', 'department'],
     *         groupField: 'department',
     *         data:{'employees':[
     *             {"name":"Michael Scott", "senority":7, "department":"Manangement"},
     *             {"name":"Dwight Schrute", "senority":2, "department":"Sales"},
     *             {"name":"Jim Halpert", "senority":3, "department":"Sales"},
     *             {"name":"Kevin Malone", "senority":4, "department":"Accounting"},
     *             {"name":"Angela Martin", "senority":5, "department":"Accounting"}
     *         ]},
     *         proxy: {
     *             type: 'memory',
     *             reader: {
     *                 type: 'json',
     *                 root: 'employees'
     *             }
     *         }
     *     });
     *
     *     Ext.create('Ext.grid.Panel', {
     *         title: 'Employees',
     *         store: Ext.data.StoreManager.lookup('employeeStore'),
     *         columns: [
     *             {header: 'Name',  dataIndex: 'name'},
     *             {header: 'Senority', dataIndex: 'senority'}
     *         ],
     *         features: [{ftype:'grouping'}],
     *         width: 200,
     *         height: 275,
     *         renderTo: Ext.getBody()
     *     });
     *
     * ## Infinite Scrolling
     *
     * Grid supports infinite scrolling as an alternative to using a paging toolbar. Your users can scroll through thousands
     * of records without the performance penalties of renderering all the records on screen at once. The grid should be bound
     * to a store with a pageSize specified.
     *
     *     var grid = Ext.create('Ext.grid.Panel', {
     *         // Use a PagingGridScroller (this is interchangeable with a PagingToolbar)
     *         verticalScrollerType: 'paginggridscroller',
     *         // do not reset the scrollbar when the view refreshs
     *         invalidateScrollerOnRefresh: false,
     *         // infinite scrolling does not support selection
     *         disableSelection: true,
     *         // ...
     *     });
     *
     * ## Paging
     *
     * Grid supports paging through large sets of data via a PagingToolbar or PagingGridScroller (see the Infinite Scrolling section above).
     * To leverage paging via a toolbar or scroller, you need to set a pageSize configuration on the Store.
     *
     *     var itemsPerPage = 2;   // set the number of items you want per page
     *
     *     var store = Ext.create('Ext.data.Store', {
     *         id:'simpsonsStore',
     *         autoLoad: false,
     *         fields:['name', 'email', 'phone'],
     *         pageSize: itemsPerPage, // items per page
     *         proxy: {
     *             type: 'ajax',
     *             url: 'pagingstore.js',  // url that will load data with respect to start and limit params
     *             reader: {
     *                 type: 'json',
     *                 root: 'items',
     *                 totalProperty: 'total'
     *             }
     *         }
     *     });
     *
     *     // specify segment of data you want to load using params
     *     store.load({
     *         params:{
     *             start:0,
     *             limit: itemsPerPage
     *         }
     *     });
     *
     *     Ext.create('Ext.grid.Panel', {
     *         title: 'Simpsons',
     *         store: store,
     *         columns: [
     *             {header: 'Name',  dataIndex: 'name'},
     *             {header: 'Email', dataIndex: 'email', flex:1},
     *             {header: 'Phone', dataIndex: 'phone'}
     *         ],
     *         width: 400,
     *         height: 125,
     *         dockedItems: [{
     *             xtype: 'pagingtoolbar',
     *             store: store,   // same store GridPanel is using
     *             dock: 'bottom',
     *             displayInfo: true
     *         }],
     *         renderTo: Ext.getBody()
     *     });
     *
     * {@img Ext.grid.Panel/Ext.grid.Panel5.png Ext.grid.Panel grouping}
     *
     * @docauthor Ed Spencer
     */
    Ext.define('Ext.grid.Panel', {
        extend: 'Ext.panel.Table',
        requires: ['Ext.grid.View'],
        alias: ['widget.gridpanel', 'widget.grid'],
        alternateClassName: ['Ext.list.ListView', 'Ext.ListView', 'Ext.grid.GridPanel'],
        viewType: 'gridview',

        lockable: false,

        // Required for the Lockable Mixin. These are the configurations which will be copied to the
        // normal and locked sub tablepanels
        normalCfgCopy: ['invalidateScrollerOnRefresh', 'verticalScroller', 'verticalScrollDock', 'verticalScrollerType', 'scroll'],
        lockedCfgCopy: ['invalidateScrollerOnRefresh'],

        /**
         * @cfg {Boolean} columnLines Adds column line styling
         */

        initComponent: function() {
            var me = this;

            if (me.columnLines) {
                me.setColumnLines(me.columnLines);
            }

            me.callParent();
        },

        setColumnLines: function(show) {
            var me = this,
                method = (show) ? 'addClsWithUI' : 'removeClsWithUI';

            me[method]('with-col-lines')
        }
    });