flex的datagrid内嵌ckeckbox控件（转来的）

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" creationComplete="init()">
<mx:Script>
    <![CDATA[
        import mx.events.ListEvent;
        public var selectedItems:Array = new Array();
       
        private function init():void{
         this.initSelectedItems()
        }
       
        //从dataProvider中将选中的项放入 selectedItems array
        private function initSelectedItems():void{
         for(var i:int=0; i <idata.length; i++){
                if(idata[i].action.toString() == "true"){
                 this.selectedItems.push(idata[i])
                }
            }
        }
       
        //将数组中的行的status 改为Delete,并且刷新Grid
        private function removeSelectedItems():void{
            for(var i:int = 0; i<selectedItems.length; i++){
                selectedItems[i].status = "Deleted";
               
           }
           idata.refresh()  
        }  
       
        private function selecteAll():void{
         for(var i:int=0; i <idata.length; i++){
          idata[i].action = "true";
          selectedItems.push(idata[i])
         }
         idata.refresh()  
        }
    ]]>
</mx:Script>
<mx:ArrayCollection id="idata">
    <mx:Object action="false" name="Kevin" status="OK" />
    <mx:Object action="false" name="Edison" status="OK" />
    <mx:Object action="true" name="Albert" status="OK" />
    <mx:Object action="false" name="Tom" status="OK" />
    <mx:Object action="false" name="Dani" status="OK" />
    <mx:Object action="false" name="Colin" status="OK" />
    <mx:Object action="false" name="Diablo" status="OK" />
    <mx:Object action="false" name="Kevin" status="OK" />
    <mx:Object action="false" name="Edison" status="OK" />
    <mx:Object action="true" name="Albert" status="OK" />
    <mx:Object action="false" name="Tom" status="OK" />
    <mx:Object action="false" name="Dani" status="OK" />
    <mx:Object action="false" name="Colin" status="OK" />
    <mx:Object action="false" name="Diablo" status="OK" />
    <mx:Object action="false" name="Kevin" status="OK" />
    <mx:Object action="false" name="Edison" status="OK" />
    <mx:Object action="true" name="Albert" status="OK" />
    <mx:Object action="false" name="Tom" status="OK" />
    <mx:Object action="false" name="Dani" status="OK" />
    <mx:Object action="false" name="Colin" status="OK" />
    <mx:Object action="false" name="Diablo" status="OK" />
    <mx:Object action="false" name="Kevin" status="OK" />
    <mx:Object action="false" name="Edison" status="OK" />
    <mx:Object action="true" name="Albert" status="OK" />
    <mx:Object action="false" name="Tom" status="OK" />
    <mx:Object action="false" name="Dani" status="OK" />
    <mx:Object action="false" name="Colin" status="OK" />
    <mx:Object action="false" name="Diablo" status="OK" />
</mx:ArrayCollection>
    <mx:DataGrid id="grid" dataProvider="{idata}">
        <mx:columns>
            <mx:DataGridColumn headerText="删除" dataField="action" itemRenderer="{new ClassFactory(iCheckBox)}" />
            <mx:DataGridColumn headerText="姓名" dataField="name" />
            <mx:DataGridColumn headerText="状态" dataField="status" />
           
        </mx:columns>
    </mx:DataGrid>
    <mx:Button label="删除所选行" click="removeSelectedItems()" />
    <mx:Button label="全选" click="selecteAll()" />
</mx:Application>
-----------------------------------

iCheckBox.as

 

package
{
    import flash.events.Event;    
    import mx.controls.CheckBox;
    import mx.core.Application;       
   
    public class iCheckBox extends CheckBox
    {
        private var currentData:Object; //保存当前一行值的对象        
        public function iCheckBox()
        {
            super();
            this.addEventListener(Event.CHANGE,changeHandle)
        }
       
        override public function set data(value:Object):void{
            this.selected = value.action.toString() == "true"?true:false;
            this.currentData = value; //保存整行的引用
        }
        //点击check box时，根据状况向selectedItems array中添加当前行的引用，或者从array中移除
        private function changeHandle(e:Event):void{
            var itemArray:Array = Application.application.selectedItems
            this.currentData.action = this.selected.toString()
            if(this.selected){
                itemArray.push(this.currentData)
            }else{
                for(var i:int = 0; i<itemArray.length; i++){
                    if(itemArray[i] == this.currentData){
                        itemArray.splice(i,1)
                    }
                }
            }
        }

    }
}