Extjs4实现desktop图标换行的问题
在desktop.js中扩展一个函数

initShortcut : function() {
        var btnHeight = 64;
        var btnWidth = 64;
        var btnPadding = 30;
        var col = {index : 1,x : btnPadding};
        var row = {index : 1,y : btnPadding};
        var bottom;
        var numberOfItems = 0;
        var taskBarHeight = Ext.query(".ux-taskbar")[0].clientHeight + 40;
        var bodyHeight = Ext.getBody().getHeight() - taskBarHeight;
        var items = Ext.query(".ux-desktop-shortcut");

        for (var i = 0, len = items.length; i < len; i++) {
            numberOfItems += 1;
            bottom = row.y + btnHeight;
            if (((bodyHeight < bottom) ? true : false) && bottom > (btnHeight + btnPadding)) {
                numberOfItems = 0;
                col = {index : col.index++,x : col.x + btnWidth + btnPadding};
                row = {index : 1,y : btnPadding};
            }
            Ext.fly(items[i]).setXY([col.x, row.y]);
            row.index++;
            row.y = row.y + btnHeight + btnPadding;
        }
    }

在createDataView添加一个监听器

createDataView: function () {
        var me = this;
        return {
            xtype: 'dataview',
            overItemCls: 'x-view-over',
            trackOver: true,
            itemSelector: me.shortcutItemSelector,
            store: me.shortcuts,
            tpl: new Ext.XTemplate(me.shortcutTpl),
            listeners:{
                resize:me.initShortcut
            }
        };
    }

在afterRender渲染结束时调用函数

afterRender: function () {
        var me = this;
        me.callParent();
        me.el.on('contextmenu', me.onDesktopMenu, me);
        Ext.Function.defer(me.initShortcut,1);
    }