Flex4 vs Flex3: Repeater vs DataGroup

1. userData = new ArrayCollection();
2. userData.addItem({"fname":"Rich","lname":"Tretola"});
3. userData.addItem({"fname":"Joe","lname":"Smith"});
4. userData.addItem({"fname":"Bill","lname":"Johnson"});

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Flex 3的例子使用了Repeater和一个名为PersonRenderer的自定义组件：
主文件中的Repeater(Flex 3)：

1. <mx:VBox horizontalCenter="0" verticalCenter="0">
2. <mx:Repeater id="rep" dataProvider="{userData}">
3. <local:PersonRenderer person="{rep.currentItem}"/>
4. </mx:Repeater>
5. </mx:VBox>

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PersonRenderer 组件(Flex 3):

1. <?xml version="1.0" encoding="utf-8"?>
2. <mx:HBox xmlns:mx="http://www.adobe.com/2006/mxml" >
3. <mx:Script>
4. <![CDATA[
5. [Bindable]
6. public var person:Object;
7. ]]>
8. </mx:Script>
9. <mx:Label text="{person.fname} {person.lname}"/>
10. </mx:HBox>

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<ignore_js_op>

使用了DataGroup和ItemRenderer的Flex4例子。代码如下：
主文件中的DataGroup:

1. <s:DataGroup itemRenderer="PersonRenderer"
2. dataProvider="{userData}"
3. verticalCenter="0" horizontalCenter="0">
4. <s:layout>
5. <s:VerticalLayout/>
6. </s:layout>
7. </s:DataGroup>

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PersonRenderer ItemRenderer (Flex 4):

1. <?xml version="1.0" encoding="utf-8"?>
2. <s:ItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"
3. xmlns:s="library://ns.adobe.com/flex/spark">
4. <s:Label text="{data.fname} {data.lname}"/>
5. </s:ItemRenderer>

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<ignore_js_op>