Flex DataGrid Scrollbar滚动条x，y起始位置设置

对flex datagrid scrollbar位置设置需要一些特殊处理，见如下截图：

 

关键点在于DataGrid拥有protected的 horizontalScrollBar 和 verticalScrollBar 属性，对其设置即可实现如上截图的效果。代码如下： package com.util.component{import mx.controls.DataGrid;import mx.events.DataGridEvent;import mx.core.ScrollPolicy;import mx.events.FlexEvent;public class AFWDataGrid extends DataGrid{public function AFWDataGrid(){super();horizontalScrollPolicy = ScrollPolicy.AUTO;}private function setScrollPos():void{if(columns == null || columns.length < lockedColumnCount)return;var xOffset:Number = 0;for(var i:int=0; i<lockedColumnCount; ++i)xOffset += columns[i].width; if (horizontalScrollBar && horizontalScrollBar.x < xOffset){ horizontalScrollBar.x = xOffset; horizontalScrollBar.setActualSize(horizontalScrollBar.width - xOffset, horizontalScrollBar.height); }if(verticalScrollBar && verticalScrollBar.y < headerHeight){verticalScrollBar.y = headerHeight; verticalScrollBar.setActualSize(verticalScrollBar.width, verticalScrollBar.height - headerHeight);}} override protected function updateDisplayList(w:Number, h:Number):void { super.updateDisplayList(w, h); setScrollPos(); }}}