Flex menubar

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
	
	
	<fx:Script>
		<![CDATA[
			import mx.events.MenuEvent;
			
			private function menuClickHandle(e:MenuEvent):void{
				switch(e.label){
					case "submenu1":currentState="index1";break;
					case "submenu2":currentState="index2";break;
					case "submenu3":currentState="index3";break;
					case "submenu4":currentState="index4";break;
					case "submenu5":currentState="index5";break;
				}
			}
			
		]]>
	</fx:Script>
	
	
	<s:states>
		<s:State name="index1" />
		<s:State name="index2" />
		<s:State name="index3" />
		<s:State name="index4" />
		<s:State name="index5" />
	</s:states>
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
		<fx:XMLList id="myXMLList">
			<item id="menu1">
				<item id="submenu1" type="radio" groupName1="one" />
				<item id="submenu2" type="radio" groupName2="one" />
			</item>
			<item id="menu2" />
			<item id="menu3" />
			<item id="menu4" >
				<item id="submenu3" type="radio" groupName="two" />
				<item id="submenu4" type="radio" groupName="two" selected="true" />
				<item id="submenu5" type="radio" groupName="two" />
			</item>
		</fx:XMLList>
	</fx:Declarations>
	
	<mx:MenuBar y="24" id="myMenubar" dataProvider="{myXMLList}" labelField="@id" width="293" horizontalCenter="0" change="menuClickHandle(event)" change.index2="menuClickHandle(event)"></mx:MenuBar>
	
	<s:Group id="group1" includeIn="index1" x="{myMenubar.x}" y="{myMenubar.y+myMenubar.height}">
		<s:Rect width="{myMenubar.width}" height="248" alpha="0.5">
			<s:fill>
				<mx:SolidColor color="#000000" />
			</s:fill>
		</s:Rect>
	</s:Group>
	<s:Group id="group2" includeIn="index2" x="{myMenubar.x}" y="{myMenubar.y+myMenubar.height}">
		<s:Rect width="{myMenubar.width}" height="248" alpha="0.5">
			<s:fill>
				<mx:SolidColor color="#f5e532" />
			</s:fill>
		</s:Rect>
	</s:Group>
	<s:Group id="group3" includeIn="index3" x="{myMenubar.x}" y="{myMenubar.y+myMenubar.height}">
		<s:Rect width="{myMenubar.width}" height="248" alpha="0.5">
			<s:fill>
				<mx:SolidColor color="#bdf531" />
			</s:fill>
		</s:Rect>
	</s:Group>
	<s:Group id="group4" includeIn="index4" x="{myMenubar.x}" y="{myMenubar.y+myMenubar.height}">
		<s:Rect width="{myMenubar.width}" height="248" alpha="0.5">
			<s:fill>
				<mx:SolidColor color="#d731f5" />
			</s:fill>
		</s:Rect>
	</s:Group>
</s:Application>

XMLList组件与XML组件不同点在于XML组件必须要有根结点。

1、菜单项的type属性为"radio",表示该菜单项为单选菜单项。

2、mx:MenuBar的labelField属性为"@id"，表示菜单项的显示内容光焕发为数据集中的"id"属性。

3、horizontalCenter属性为"0",表示菜单居中显示。

4、includeIn属性是添加元素(相当于AddChild)，excludeFrom属性是删除元素