    /**
     * @class Ext.list.ListView
     * @extends Ext.DataView
     * <p>Ext.list.ListView is a fast and light-weight implentation of a
     * {@link Ext.grid.GridPanel Grid} like view with the following characteristics:</p>
     * <div class="mdetail-params"><ul>
     * <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',
        /**
         * @cfg {Boolean} reserveScrollOffset
         * By default will defer accounting for the configured <b><tt>{@link #scrollOffset}</tt></b>
         * for 10 milliseconds.  Specify <tt>true</tt> to account for the configured
         * <b><tt>{@link #scrollOffset}</tt></b> immediately.
         */
        /**
         * @cfg {Number} scrollOffset The amount of space to reserve for the scrollbar (defaults to
         * <tt>undefined</tt>). If an explicit value isn't specified, this will be automatically
         * calculated.
         */
        scrollOffset : undefined,
        /**
         * @cfg {Boolean/Object} columnResize
         * Specify <tt>true</tt> or specify a configuration object for {@link Ext.list.ListView.ColumnResizer}
         * to enable the columns to be resizable (defaults to <tt>true</tt>).
         */
        columnResize: true,
        /**
         * @cfg {Array} columns An array of column configuration objects, for example:
         * <pre><code>
    {
        align: 'right',
        dataIndex: 'size',
        header: 'Size',
        tpl: '{size:fileSize}',
        width: .35
    }
         * </code></pre>
         * Acceptable properties for each column configuration object are:
         * <div class="mdetail-params"><ul>
         * <li><b><tt>align</tt></b> : String<div class="sub-desc">Set the CSS text-align property
         * of the column. Defaults to <tt>'left'</tt>.</div></li>
         * <li><b><tt>dataIndex</tt></b> : String<div class="sub-desc">See {@link Ext.grid.Column}.
         * {@link Ext.grid.Column#dataIndex dataIndex} for details.</div></li>
         * <li><b><tt>header</tt></b> : String<div class="sub-desc">See {@link Ext.grid.Column}.
         * {@link Ext.grid.Column#header header} for details.</div></li>
         * <li><b><tt>tpl</tt></b> : String<div class="sub-desc">Specify a string to pass as the
         * configuration string for {@link Ext.XTemplate}.  By default an {@link Ext.XTemplate}
         * will be implicitly created using the <tt>dataIndex</tt>.</div></li>
         * <li><b><tt>width</tt></b> : Number<div class="sub-desc">Percentage 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.</div></li>
         * </ul></div>
         */
        /**
         * @cfg {Boolean/Object} columnSort
         * Specify <tt>true</tt> or specify a configuration object for {@link Ext.list.ListView.Sorter}
         * to enable the columns to be sortable (defaults to <tt>true</tt>).
         */
        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.
         */
        maxColumnWidth: Ext.isIE9m ? 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(
                    '<div class="x-list-header"><div class="x-list-header-inner">',
                        '<tpl for="columns">',
                        '<div style="width:{[values.width*100]}%;text-align:{align};"><em class="x-unselectable" unselectable="on" id="',this.id, '-xlhd-{#}">',
                            '{header}',
                        '</em></div>',
                        '</tpl>',
                        '<div class="x-clear"></div>',
                    '</div></div>',
                    '<div class="x-list-body"><div class="x-list-body-inner">',
                    '</div></div>'
                );
            }
            if(!this.tpl){
                this.tpl = new Ext.XTemplate(
                    '<tpl for="rows">',
                        '<dl>',
                            '<tpl for="parent.columns">',
                            '<dt style="width:{[values.width*100]}%;text-align:{align};">',
                            '<em unselectable="on"<tpl if="cls"> class="{cls}</tpl>">',
                                '{[values.tpl.apply(parent)]}',
                            '</em></dt>',
                            '</tpl>',
                            '<div class="x-clear"></div>',
                        '</dl>',
                    '</tpl>'
                );
            };

            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;
                    if(allocatedWidth > this.maxColumnWidth){
                        c.width -= (allocatedWidth - this.maxColumnWidth) / 100;
                    }
                    colsWithWidth++;
                }
                columns.push(c);
            }

            cs = this.columns = columns;

            // auto calculate missing column widths
            if(colsWithWidth < len){
                var remaining = len - colsWithWidth;
                if(allocatedWidth < this.maxColumnWidth){
                    var perCol = ((this.maxColumnWidth-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;
        },

        /**
         * <p>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:</p>
         * <div class="mdetail-params"><ul>
         * <li><b>columns</b> : String<div class="sub-desc">See <tt>{@link #columns}</tt></div></li>
         * <li><b>rows</b> : String<div class="sub-desc">See
         * <tt>{@link Ext.DataView}.{@link Ext.DataView#collectData collectData}</div></li>
         * </ul></div>
         * @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 body = this.innerBody.dom,
                header = this.innerHd.dom,
                scrollWidth = w - Ext.num(this.scrollOffset, Ext.getScrollBarWidth()) + 'px',
                parentNode;

            if(!body){
                return;
            }
            parentNode = body.parentNode;
            if(Ext.isNumber(w)){
                if(this.reserveScrollOffset || ((parentNode.offsetWidth - parentNode.clientWidth) > 10)){
                    body.style.width = scrollWidth;
                    header.style.width = scrollWidth;
                }else{
                    body.style.width = w + 'px';
                    header.style.width = w + 'px';
                    setTimeout(function(){
                        if((parentNode.offsetWidth - parentNode.clientWidth) > 10){
                            body.style.width = scrollWidth;
                            header.style.width = scrollWidth;
                        }
                    }, 10);
                }
            }
            if(Ext.isNumber(h)){
                parentNode.style.height = Math.max(0, h - header.parentNode.offsetHeight) + 'px';
            }
        },

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

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

        setHdWidths : function(){
            var els = this.innerHd.dom.getElementsByTagName('div'),
                i = 0,
                columns = this.columns,
                len = columns.length;

            for(; i < len; i++){
                els[i].style.width = (columns[i].width*100) + '%';
            }
        }
    });

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

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