flex DataGrid checkbox 全选 单选 反选 XMLListCollection ArrayCollection 转换

每个功能需求不一样，网上有很多例子

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
				layout="absolute">
	<mx:Script>
		<![CDATA[
			import mx.collections.ArrayCollection;
			import mx.controls.Alert;
			import mx.controls.CheckBox;
			import mx.events.FlexEvent;
			
			//XMLListCollection.source     转成xmllist   xmlListCollection.source=xmlList; 
			//XMLListCollection.toArray()  转成ArrayCollection  provider=new ArrayCollection(xmlListCollection.toArray()); grid.dataProvider=provider;  

			
			[Bindable]
			private var dataSource:ArrayCollection=new ArrayCollection([
				{id: 0, name: "test1", age: 12, checked:false}, 
				{id: 1, name: "test1", age: 12, checked:false}, 
				{id: 2, name: "test2", age: 40, checked:false}, 
				{id: 3, name: "test3", age: 20, checked:false}, 
				{id: 4, name: "test1", age: 12, checked:false}, 
				{id: 5, name: "test4", age: 18, checked:false}, 
				{id: 6, name: "test5", age: 60, checked:false}]);
			
			//得到选中项的值
			public function test():void
			{
				var allRows:int = dataSource.length;
				for (var i:int = 0; i < allRows; i++){
					if(dataSource[i].checked==true){
						Alert.show(i.toString());
						Alert.show(dataSource.getItemAt(i).name);
					}else{
						Alert.show("至少选中一个");
					}
				}
				//数据源没有值，不给出提示
				Alert.show("数据源没有值");
			}
			
			public function selectAllCheckboxes(obj:Object):void{
				var allRows:int = dataSource.length;
				for (var i:int = 0; i < allRows; i++){
					if(adGrid.selectedIndex==i){
						dataSource[i].checked = true;
					}else{
						dataSource[i].checked = false;
					}
				}
				dataSource.refresh();
			}
			
			
			public function selects():void{
				var allRow:int = dataSource.length;
				for (var i:int = 0; i < allRow; i++){
					if (selectAll.selected == true){
						trace ("Checked is true");
						dataSource[i].checked = true;
					}else{
						trace ("Checked is false");
						dataSource[i].checked = false;
					}
				}
				dataSource.refresh();
			}

		]]>
	</mx:Script>
	
	<mx:VBox>
		
	<mx:HBox >
	<mx:DataGrid id="adGrid"
				 width="300"
				 height="253"
				 fontSize="14"
				 dataProvider="{dataSource}"
				 x="262.5"
				 y="203">
		
		<mx:columns>
			<mx:DataGridColumn headerText="序号"
							   dataField="id"/>
			<mx:DataGridColumn headerText="名称"
							   dataField="name"/>
			
			<mx:DataGridColumn headerText="是否选择" dataField="checked" 
							   textAlign="center">
				<mx:itemRenderer>
					<mx:Component>
						<mx:HBox verticalAlign="middle" horizontalAlign="center">
							<mx:CheckBox id="checkbox"   selected="{data.checked}" click="outerDocument.selectAllCheckboxes(this)"/>
						</mx:HBox>
					</mx:Component>
				</mx:itemRenderer>
			</mx:DataGridColumn>
		</mx:columns>
	</mx:DataGrid>
	</mx:HBox>
	
	<mx:HBox>
		<mx:Button label="哪些被选中了？" click="test()"/>
		<mx:CheckBox id = "selectAll" label="Select/Deselect All" click="selects();" left="10" top="175"/>
	</mx:HBox>
		
	</mx:VBox>
</mx:Application>