Flex4 停止传播事件

关于停止传播事件的实现非常简单，使用了stopPropagation和stopImmediatePropagation方法。

和JS作用基本相同：

topPropagation()方法阻止事件对象移到到另一个节点上，但是允许当前节点的其他事件监听函数执行，而stopImmediatePropagation()方法不仅阻止事件从当前节点移动到另一个节点上，它还不允许当前节点的其他事件监听函数执行。

 

以实现topPropagation方法为例

<?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"
			   applicationComplete="init()" xmlns:net="net.*">
	
	<fx:Script>
		<![CDATA[
			import events.ContentEvent;
			
			import mx.collections.ArrayCollection;
			import mx.controls.Alert;
			
			import net.DataLoader;
			
			protected function init():void
			{
				button.addEventListener(MouseEvent.CLICK,onClick);
				box.addEventListener(MouseEvent.CLICK,onParentClick);
			}
			
			protected function onClick(event:Event)
			{
				Alert.show("As event.Calling Stop","First Event");
				event.stopPropagation();
			}
			
			protected function onParentClick(event:Event)
			{
				Alert.show("ParentCllick","Never Event");
			}
			
			protected function onButtonClick(event:Event)
			{
				Alert.show("Start","button Event");
			}
		]]>
	</fx:Script>
	<fx:Declarations>
	</fx:Declarations>
	<fx:Metadata>
		
	</fx:Metadata>
	<s:Panel verticalCenter="0" horizontalCenter="0" title="Mix" width="450" height="300">
		<s:HGroup id="box" width="100%">
			<s:Button id="button" label="First Event" click="onButtonClick(event)"/>
		</s:HGroup>
	</s:Panel>
</s:Application>