    /**
     * @class Ext.list.ListView
     * @extends Ext.DataView
     * Ext.list.ListView is a fast and light-weight implentation of a
     * {@link Ext.grid.GridPanel Grid} like view with the following characteristics:
     *
     * resizable columns
     * selectable
     * column widths are initially proportioned by percentage based on the container
     * width and number of columns
     * uses templates to render the data in any required format
     * no horizontal scrolling
     * no editing
     *
     * Example usage:
     *
    // 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 (0 items selected)',
        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 ('+l+' item'+s+' selected)');
    });
     *
     * @constructor
     * @param {Object} config
     * @xtype listview
     */
    Ext.list.ListView = Ext.extend(Ext.DataView, {
        /**
         * Set this property to true to disable the header click handler disabling sort
         * (defaults to false).
         * @type Boolean
         * @property disableHeaders
         */
        /**
         * @cfg {Boolean} hideHeaders
         * true to hide the {@link #internalTpl header row} (defaults to false so
         * the {@link #internalTpl header row} will be shown).
         */
        /**
         * @cfg {String} itemSelector
         * Defaults to 'dl' to work with the preconfigured {@link Ext.DataView#tpl tpl}.
         * This setting specifies the CSS selector (e.g. div.some-class or span:first-child)
         * 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
         * 'x-list-selected'). An example overriding the default styling:

        .x-list-selected {background-color: yellow;}

         * @type String
         */
        selectedClass:'x-list-selected',
        /**
         * @cfg {String} overClass The CSS class applied when over a row (defaults to
         * 'x-list-over'). An example overriding the default styling:

        .x-list-over {background-color: orange;}

         * @type String
         */
        overClass:'x-list-over',
        /**
         * @cfg {Boolean} reserveScrollOffset
         * By default will defer accounting for the configured {@link #scrollOffset}
         * for 10 milliseconds.  Specify true to account for the configured
         * {@link #scrollOffset} immediately.
         */
        /**
         * @cfg {Number} scrollOffset The amount of space to reserve for the scrollbar (defaults to
         * undefined). If an explicit value isn't specified, this will be automatically
         * calculated.
         */
        scrollOffset : undefined,
        /**
         * @cfg {Boolean/Object} columnResize
         * Specify true or specify a configuration object for {@link Ext.list.ListView.ColumnResizer}
         * to enable the columns to be resizable (defaults to true).
         */
        columnResize: true,
        /**
         * @cfg {Array} columns An array of column configuration objects, for example:
         *
    {
        align: 'right',
        dataIndex: 'size',
        header: 'Size',
        tpl: '{size:fileSize}',
        width: .35
    }
         *
         * Acceptable properties for each column configuration object are:
         *
         * align : StringSet the CSS text-align property
         * of the column. Defaults to 'left'.
         * dataIndex : StringSee {@link Ext.grid.Column}.
         * {@link Ext.grid.Column#dataIndex dataIndex} for details.
         * header : StringSee {@link Ext.grid.Column}.
         * {@link Ext.grid.Column#header header} for details.
         * tpl : StringSpecify a string to pass as the
         * configuration string for {@link Ext.XTemplate}.  By default an {@link Ext.XTemplate}
         * will be implicitly created using the dataIndex.
         * width : NumberPercentage of the container width
         * this column should be allocated.  Columns that have no width specified will be
         * allocated with an equal percentage to fill 100% of the container width.  To easily take
         * advantage of the full container width, leave the width of at least one column undefined.
         * Note that if you do not want to take up the full width of the container, the width of
         * every column needs to be explicitly defined.
         *
         */
        /**
         * @cfg {Boolean/Object} columnSort
         * Specify true or specify a configuration object for {@link Ext.list.ListView.Sorter}
         * to enable the columns to be sortable (defaults to true).
         */
        columnSort: true,
        /**
         * @cfg {String/Array} internalTpl
         * The template to be used for the header row.  See {@link #tpl} for more details.
         */

        /*
         * IE has issues when setting percentage based widths to 100%. Default to 99.
         */
        maxWidth: Ext.isIE ? 99 : 100,

        initComponent : function(){
            if(this.columnResize){
                this.colResizer = new Ext.list.ColumnResizer(this.colResizer);
                this.colResizer.init(this);
            }
            if(this.columnSort){
                this.colSorter = new Ext.list.Sorter(this.columnSort);
                this.colSorter.init(this);
            }
            if(!this.internalTpl){
                this.internalTpl = new Ext.XTemplate(
                    '',
                        '',
                        '',
                            '{header}',
                        '',
                        '',
                        '',
                    '',
                    '',
                    ''
                );
            }
            if(!this.tpl){
                this.tpl = new Ext.XTemplate(
                    '',
                        '',
                            '',
                            '',
                            ' class="{cls}">',
                                '{[values.tpl.apply(parent)]}',
                            '',
                            '',
                            '',
                        '',
                    ''
                );
            };

            var cs = this.columns,
                allocatedWidth = 0,
                colsWithWidth = 0,
                len = cs.length,
                columns = [];

            for(var i = 0; i < len; i++){
                var c = cs[i];
                if(!c.isColumn) {
                    c.xtype = c.xtype ? (/^lv/.test(c.xtype) ? c.xtype : 'lv' + c.xtype) : 'lvcolumn';
                    c = Ext.create(c);
                }
                if(c.width) {
                    allocatedWidth += c.width*100;
                    colsWithWidth++;
                }
                columns.push(c);
            }

            cs = this.columns = columns;

            // auto calculate missing column widths
            if(colsWithWidth < len){
                var remaining = len - colsWithWidth;
                if(allocatedWidth < this.maxWidth){
                    var perCol = ((this.maxWidth-allocatedWidth) / remaining)/100;
                    for(var j = 0; j < len; j++){
                        var c = cs[j];
                        if(!c.width){
                            c.width = perCol;
                        }
                    }
                }
            }
            Ext.list.ListView.superclass.initComponent.call(this);
        },

        onRender : function(){
            this.autoEl = {
                cls: 'x-list-wrap'
            };
            Ext.list.ListView.superclass.onRender.apply(this, arguments);

            this.internalTpl.overwrite(this.el, {columns: this.columns});

            this.innerBody = Ext.get(this.el.dom.childNodes[1].firstChild);
            this.innerHd = Ext.get(this.el.dom.firstChild.firstChild);

            if(this.hideHeaders){
                this.el.dom.firstChild.style.display = 'none';
            }
        },

        getTemplateTarget : function(){
            return this.innerBody;
        },

        /**
         * Function which can be overridden which returns the data object passed to this
         * view's {@link #tpl template} to render the whole ListView. The returned object
         * shall contain the following properties:
         *
         * columns : StringSee {@link #columns}
         * rows : StringSee
         * {@link Ext.DataView}.{@link Ext.DataView#collectData collectData}
         *
         * @param {Array} records An Array of {@link Ext.data.Record}s to be rendered into the DataView.
         * @param {Number} startIndex the index number of the Record being prepared for rendering.
         * @return {Object} A data object containing properties to be processed by a repeating
         * XTemplate as described above.
         */
        collectData : function(){
            var rs = Ext.list.ListView.superclass.collectData.apply(this, arguments);
            return {
                columns: this.columns,
                rows: rs
            }
        },

        verifyInternalSize : function(){
            if(this.lastSize){
                this.onResize(this.lastSize.width, this.lastSize.height);
            }
        },

        // private
        onResize : function(w, h){
            var bd = this.innerBody.dom;
            var hd = this.innerHd.dom
            if(!bd){
                return;
            }
            var bdp = bd.parentNode;
            if(Ext.isNumber(w)){
                var sw = w - Ext.num(this.scrollOffset, Ext.getScrollBarWidth());
                if(this.reserveScrollOffset || ((bdp.offsetWidth - bdp.clientWidth) > 10)){
                    bd.style.width = sw + 'px';
                    hd.style.width = sw + 'px';
                }else{
                    bd.style.width = w + 'px';
                    hd.style.width = w + 'px';
                    setTimeout(function(){
                        if((bdp.offsetWidth - bdp.clientWidth) > 10){
                            bd.style.width = sw + 'px';
                            hd.style.width = sw + 'px';
                        }
                    }, 10);
                }
            }
            if(Ext.isNumber(h)){
                bdp.style.height = (h - hd.parentNode.offsetHeight) + 'px';
            }
        },

        updateIndexes : function(){
            Ext.list.ListView.superclass.updateIndexes.apply(this, arguments);
            this.verifyInternalSize();
        },

        findHeaderIndex : function(hd){
            hd = hd.dom || hd;
            var pn = hd.parentNode, cs = pn.parentNode.childNodes;
            for(var i = 0, c; c = cs[i]; i++){
                if(c == pn){
                    return i;
                }
            }
            return -1;
        },

        setHdWidths : function(){
            var els = this.innerHd.dom.getElementsByTagName('div');
            for(var i = 0, cs = this.columns, len = cs.length; i < len; i++){
                els[i].style.width = (cs[i].width*100) + '%';
            }
        }
    });

    Ext.reg('listview', Ext.list.ListView);

    // Backwards compatibility alias
    Ext.ListView = Ext.list.ListView;