    /**
     * @author Aaron Conran
     * @docauthor Ed Spencer
     *
     * 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 two main pieces - a {@link Ext.data.Store Store} full of data and a set of columns to render.
     *
     * ## Basic GridPanel
     *
     *     @example
     *     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: [
     *             { text: 'Name',  dataIndex: 'name' },
     *             { text: 'Email', dataIndex: 'email', flex: 1 },
     *             { text: '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: [
     *         {
     *             text: 'Name',
     *             dataIndex: 'name',
     *             sortable: false,
     *             hideable: false,
     *             flex: 1
     *         },
     *         {
     *             text: 'Email',
     *             dataIndex: 'email',
     *             hidden: true
     *         },
     *         {
     *             text: '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: [
     *         {
     *             text: '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.
     *
     * ## 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' }
     *     ]);
     *
     * See {@link Ext.data.Store} for examples of filtering.
     *
     * ## State saving
     *
     * When configured {@link #stateful}, grids save their column state (order and width) encapsulated within the default
     * Panel state of changed width and height and collapsed/expanded state.
     *
     * Each {@link #columns column} of the grid may be configured with a {@link Ext.grid.column.Column#stateId stateId} which
     * identifies that column locally within the grid.
     *
     * ## Plugins and Features
     *
     * Grid supports addition of extra functionality through features and plugins:
     *
     * - {@link Ext.grid.plugin.CellEditing CellEditing} - editing grid contents one cell at a time.
     *
     * - {@link Ext.grid.plugin.RowEditing RowEditing} - editing grid contents an entire row at a time.
     *
     * - {@link Ext.grid.plugin.DragDrop DragDrop} - drag-drop reordering of grid rows.
     *
     * - {@link Ext.toolbar.Paging Paging toolbar} - paging through large sets of data.
     *
     * - {@link Ext.grid.plugin.BufferedRenderer Infinite scrolling} - another way to handle large sets of data.
     *
     * - {@link Ext.grid.RowNumberer RowNumberer} - automatically numbered rows.
     *
     * - {@link Ext.grid.feature.Grouping Grouping} - grouping together rows having the same value in a particular field.
     *
     * - {@link Ext.grid.feature.Summary Summary} - a summary row at the bottom of a grid.
     *
     * - {@link Ext.grid.feature.GroupingSummary GroupingSummary} - a summary row at the bottom of each group.
     */
    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,

        /**
         * @cfg {Boolean} rowLines False to remove row line styling
         */
        rowLines: true

        // Columns config is required in Grid
        /**
         * @cfg {Ext.grid.column.Column[]/Object} columns (required)
         * @inheritdoc
         */

        /**
         * @event beforereconfigure
         * Fires before a reconfigure to enable modification of incoming Store and columns.
         * @param {Ext.grid.Panel} this
         * @param {Ext.data.Store} store The store that was passed to the {@link #method-reconfigure} method
         * @param {Object[]} columns The column configs that were passed to the {@link #method-reconfigure} method
         * @param {Ext.data.Store} oldStore The store that will be replaced
         * @param {Ext.grid.column.Column[]} The column headers that will be replaced.
         */

        /**
         * @event reconfigure
         * Fires after a reconfigure.
         * @param {Ext.grid.Panel} this
         * @param {Ext.data.Store} store The store that was passed to the {@link #method-reconfigure} method
         * @param {Object[]} columns The column configs that were passed to the {@link #method-reconfigure} method
         * @param {Ext.data.Store} oldStore The store that was replaced
         * @param {Ext.grid.column.Column[]} The column headers that were replaced.
         */

        /**
         * @method reconfigure
         * Reconfigures the grid with a new store/columns. Either the store or the columns can be omitted if you don't wish
         * to change them.
         * @param {Ext.data.Store} store (Optional) The new store.
         * @param {Object[]} columns (Optional) An array of column configs
         */
    });