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 * <li>resizable columns</li>
 * <li>selectable</li>
 * <li>column widths are initially proportioned by percentage based on the container
 * width and number of columns</li>
 * <li>uses templates to render the data in any required format</li>
 * <li>no horizontal scrolling</li>
 * <li>no editing</li>
 * </ul></div>
 * <p>Example usage:</p>
 * <pre><code>
// consume JSON of this form:
{
   "images":[
      {
         "name":"dance_fever.jpg",
         "size":2067,
         "lastmod":1236974993000,
         "url":"images\/thumbs\/dance_fever.jpg"
      },
      {
         "name":"zack_sink.jpg",
         "size":2303,
         "lastmod":1236974993000,
         "url":"images\/thumbs\/zack_sink.jpg"
      }
   ]
}
var store = new Ext.data.JsonStore({
    url: 'get-images.php',
    root: 'images',
    fields: [
        'name', 'url',
        {name:'size', type: 'float'},
        {name:'lastmod', type:'date', dateFormat:'timestamp'}
    ]
});
store.load();

var listView = new Ext.list.ListView({
    store: store,
    multiSelect: true,
    emptyText: 'No images to display',
    reserveScrollOffset: true,
    columns: [{
        header: 'File',
        width: .5,
        dataIndex: 'name'
    },{
        header: 'Last Modified',
        width: .35,
        dataIndex: 'lastmod',
        tpl: '{lastmod:date("m-d h:i a")}'
    },{
        header: 'Size',
        dataIndex: 'size',
        tpl: '{size:fileSize}', // format using Ext.util.Format.fileSize()
        align: 'right'
    }]
});

// put it in a Panel so it looks pretty
var panel = new Ext.Panel({
    id:'images-view',
    width:425,
    height:250,
    collapsible:true,
    layout:'fit',
    title:'Simple ListView <i>(0 items selected)</i>',
    items: listView
});
panel.render(document.body);

// little bit of feedback
listView.on('selectionchange', function(view, nodes){
    var l = nodes.length;
    var s = l != 1 ? 's' : '';
    panel.setTitle('Simple ListView <i>('+l+' item'+s+' selected)</i>');
});
 * </code></pre>
 * @constructor
 * @param {Object} config
 * @xtype listview
 */
Ext.list.ListView = Ext.extend(Ext.DataView, {
    /**
     * Set this property to <tt>true</tt> to disable the header click handler disabling sort
     * (defaults to <tt>false</tt>).
     * @type Boolean
     * @property disableHeaders
     */
    /**
     * @cfg {Boolean} hideHeaders
     * <tt>true</tt> to hide the {@link #internalTpl header row} (defaults to <tt>false</tt> so
     * the {@link #internalTpl header row} will be shown).
     */
    /**
     * @cfg {String} itemSelector
     * Defaults to <tt>'dl'</tt> to work with the preconfigured <b><tt>{@link Ext.DataView#tpl tpl}</tt></b>.
     * This setting specifies the CSS selector (e.g. <tt>div.some-class</tt> or <tt>span:first-child</tt>)
     * that will be used to determine what nodes the ListView will be working with.
     */
    itemSelector: 'dl',
    /**
     * @cfg {String} selectedClass The CSS class applied to a selected row (defaults to
     * <tt>'x-list-selected'</tt>). An example overriding the default styling:
    <pre><code>
    .x-list-selected {background-color: yellow;}
    </code></pre>
     * @type String
     */
    selectedClass:'x-list-selected',
    /**
     * @cfg {String} overClass The CSS class applied when over a row (defaults to
     * <tt>'x-list-over'</tt>). An example overriding the default styling:
    <pre><code>
    .x-list-over {background-color: orange;}
    </code></pre>
     * @type String
     */
    overClass:'x-list-over',
    /**