Flex3 DataGrid拖拽到ClumnChart动态显示图表实现代码

<?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
]);
//ColumnChart的数据源, 默认为空
[Bindable]
private var chartData:ArrayCollection = new ArrayCollection();
[Bindable]
private var menu:ContextMenu = new ContextMenu();
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();
}
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", Gold: 27, Silver:27, 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>