Flex3 DataGrid拖拽到ClumnChart动态显示图表

支持多行同时拖拽，重复数据不重得添加，添加了图表右键菜单.

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init()">
<mx:Script>
    <![CDATA[
        import mx.controls.Alert;
        import mx.controls.DataGrid;
        import mx.managers.DragManager;
        import mx.core.UIComponent;
        import mx.collections.ArrayCollection;
        import mx.events.DragEvent;
        
        //DataGrid的数据源
     [Bindable]
     private var medalsAC:ArrayCollection = new ArrayCollection( [
         { Country: "美国",Gold: 35,Silver:39,Bronze: 29 },{ Country: "中国",Gold: 99,Silver:17,Bronze: 14 },{ Country: "日本",Gold: 32,Silver:27,Bronze: 38 },{ Country: "韩国",Gold: 27,Bronze: 2 },{ Country: "新加坡",Gold: 55,Bronze: 63 },{ Country: "朝鲜",Gold: 11,Silver:21,Bronze: 16 },{ Country: "马来西亚",Gold: 7,Silver:14,Bronze: 77 },{ Country: "澳洲",Gold: 0,Silver:12,Bronze: 11 } 
          ]);
      
     //ColumnChart的数据源,默认为空  
     [Bindable]
     private var chartData:ArrayCollection = new ArrayCollection();
       [Bindable]
       private var menu:ContextMenu = new ContextMenu();    
      //让columnChart监听拖拽事件 
     private function init():void{
         column.addEventListener(DragEvent.DRAG_ENTER,dragEnterHandle);
         column.addEventListener(DragEvent.DRAG_DROP,dragdropHandle);
         //初始化右键菜单
         initMenu();
     }
      //初始化chart右键菜单
      private function initMenu():void    
      {
          var clear:ContextMenuItem = new ContextMenuItem("清空图表"); 
          menu.customItems.push(clear);
          clear.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT,clearAction);
      }    
      //处理鼠标右键事件
      private function clearAction(event:ContextMenuEvent):void
      {
          this.chartData.removeAll();
      }
      
     //因为只有DataGrid推拽，所以直接允许，如果界面上有多个控件监听拖拽事件，需要判断后允许正确的数据进入
     private function dragEnterHandle(e:DragEvent):void{
         DragManager.acceptDragDrop(e.currentTarget as UIComponent)
     }
  
     //拖拽放开后处理
     private function dragdropHandle(e:DragEvent):void{
         //往column chart的dataprovider中添加拖拽数据。
         //如果只需要特定的数据进入column chart，可以先做数据筛选。
         var datas: Array =  (e.dragInitiator as DataGrid).selectedItems;
         for(var i:int = 0; i < datas.length; i ++)
         {
             //不包含已经存在的数据再添加
             if(!chartData.contains(datas[i]))
             {
                 chartData.addItem(datas[i]);
             }
         }
         
     }
        
    ]]>
</mx:Script>

    <mx:DataGrid dragEnabled="true" dataProvider="{medalsAC}"  x="192" y="52" allowMultipleSelection="true">
        <mx:columns>
            <mx:DataGridColumn dataField="Country" headerText="国家"  />
            <mx:DataGridColumn dataField="Gold" headerText="金牌"/>
            <mx:DataGridColumn dataField="Silver" headerText="银牌"/>
            <mx:DataGridColumn dataField="Bronze" headerText="铜牌"/>
        </mx:columns>
    </mx:DataGrid>
    
     <!-- 定义颜色 -->
    <mx:SolidColor id="sc1" color="yellow" alpha=".8"/>
    <mx:SolidColor id="sc2" color="0xCCCCCC" alpha=".6"/>
    <mx:SolidColor id="sc3" color="0xFFCC66" alpha=".6"/>
    
    <!-- 定义颜色 -->
    <mx:Stroke id="s1" color="yellow" weight="2"/>
    <mx:Stroke id="s2" color="0xCCCCCC" weight="2"/>
    <mx:Stroke id="s3" color="0xFFCC66" weight="2"/>
    
    <!--Column chart设置成能解析Country: "Russia",Bronze: 38这样的数据项-->
    <mx:ColumnChart id="column" contextMenu="{menu}"
            height="202" 
            width="402" 
            paddingLeft="5" 
            paddingRight="5" 
            showDataTips="true" 
            dataProvider="{chartData}"
         x="192" y="215">     
              
              <!--设置水平轴-->
            <mx:horizontalAxis>
            <!--水平轴拖动数据到chart后的文字显示-->
                <mx:CategoryAxis categoryField="Country" />
            </mx:horizontalAxis>
            <!--设置柱子-->
            <!--fill填充颜色,stroke边框颜色-->
            <mx:series>
                <mx:ColumnSeries 
                    xField="Country" 
                    yField="Gold" 
                    displayName="金牌"
                    fill="{sc1}"  
                    stroke="{s1}" 
                />
                <mx:ColumnSeries 
                    xField="Country" 
                    yField="Silver" 
                    displayName="银牌"
                    fill="{sc2}"
                    stroke="{s2}"
                />
                <mx:ColumnSeries 
                    xField="Country" 
                    yField="Bronze" 
                    displayName="铜牌"
                    fill="{sc3}"
                    stroke="{s3}"
                />
            </mx:series>
        </mx:ColumnChart>

</mx:Application>