Flex实例一(实现左右多选框的拖拽、点击选择，双击选择，左右互选)

代码:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="450" height="350" creationComplete="initApp()" backgroundColor="#FFFFFF" fontSize="12"> 
<mx:Script>
<![CDATA[
import mx.events.ScrollEvent;
     import mx.rpc.events.FaultEvent;   
     import mx.rpc.events.ResultEvent; 
     import mx.controls.Alert; 
     import mx.collections.ArrayCollection; 
     private function initApp():void{
      left.dataProvider=['广东','广西','内蒙古','北京','上海','江苏','江西','湖南','湖北','四川','西藏','新疆'];
      right.dataProvider=[];
    }
    private function toRight():void
    {
    var selectItems:Array = left.selectedItems;
    var selectIndexs:Array = left.selectedIndices;
        Alert.show(selectItems.toString()+"---"+left.selectedIndices.toString());
        if(right.dataProvider == null) 
        { 
             right.dataProvider = new ArrayCollection(); 
        } 
        for( var i:Number = 0 ; i < selectItems.length ; i++ )
        {
              ArrayCollection(right.dataProvider).addItem(selectItems[i].toString()); 
              ArrayCollection(left.dataProvider).removeItemAt(selectIndexs[i]);
        }
         
       
    }
    private function toLeft():void
    {
    var selectItems:Array = right.selectedItems;
    var selectIndexs:Array = right.selectedIndices;
        //Alert.show(selectItems.toString()+"---"+left.selectedIndices.toString());
        if(left.dataProvider == null) 
        { 
             left.dataProvider = new ArrayCollection(); 
        } 
        for( var i:Number = 0 ; i < selectItems.length ; i++ )
        {
              ArrayCollection(left.dataProvider).addItem(selectItems[i].toString()); 
              ArrayCollection(right.dataProvider).removeItemAt(selectIndexs[i]);
        }
    }

]]>
</mx:Script>
<mx:Panel x="0" y="0" width="450" height="350" layout="absolute" title="左右互选">
    <mx:Label x="7" y="3" text="当前内容"/>
    <mx:List x="7" y="25" id="left" width="168" height="275" allowMultipleSelection="true" 
          dragEnabled="true" dropEnabled="true" dragMoveEnabled="true" doubleClickEnabled="true" itemDoubleClick="toRight()"> 
    </mx:List>
    <mx:Label x="243" y="3" text="移动内容"/>
    <mx:List x="243" y="25" id="right" width="180" height="272" allowMultipleSelection="true" 
          dragEnabled="true" dropEnabled="true" dragMoveEnabled="true" doubleClickEnabled="true" itemDoubleClick="toLeft()"> 
    </mx:List>
    <mx:Button x="183" y="121" label="-&gt;&gt;" click="toRight()" id="bt_r"/>
    <mx:Button x="183" y="178" label="&lt;&lt;-" click="toLeft()" id="bt_l"/>
</mx:Panel>
</mx:Application>