事件优先级总结

package event
{
	import flash.events.Event;

	import spark.components.Button;

	[Event(name="test", type="flash.events.Event")]
	[Event(name="demo", type="flash.events.Event")]

	public class EventPriorityButton extends Button
	{
		public function EventPriorityButton()
		{
			super();
			this.addEventListener("test", test1);
			this.addEventListener("test", test2);
			this.addEventListener("demo", demo2);
			this.addEventListener("demo", demo1);
		}

		private function test1(event:Event):void
		{
			trace("EventPriorityButton.test1");
		}

		private function test2(event:Event):void
		{
			trace("EventPriorityButton.test2");
		}

		private function demo1(event:Event):void
		{
			trace("EventPriorityButton.demo1");
		}

		private function demo2(event:Event):void
		{
			trace("EventPriorityButton.demo2");
		}
	}
}

<?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"
			   xmlns:event="event.*"
			   creationComplete="eventPriorityTestApp_creationCompleteHandler(event)">
	<fx:Script>
		<![CDATA[
			import mx.events.FlexEvent;

			protected function eventPriorityTestApp_creationCompleteHandler(event:FlexEvent):void
			{
				eventPriorityTestButton.addEventListener("test", test3);
				eventPriorityTestButton.addEventListener("test", test4, false, 20000);
				eventPriorityTestButton.addEventListener("demo", demo3);
				eventPriorityTestButton.addEventListener("demo", demo4, false, 10000);
			}

			protected function eventPriorityTestButton_clickHandler(event:MouseEvent):void
			{
				eventPriorityTestButton.dispatchEvent(new Event("demo"));
				eventPriorityTestButton.dispatchEvent(new Event("test"));
			}

			protected function test3(event:Event):void
			{
				trace("EventPriorityApp.test3");
			}

			protected function test4(event:Event):void
			{
				trace("EventPriorityApp.test4");
			}

			protected function demo3(event:Event):void
			{
				trace("EventPriorityApp.demo3");
			}

			protected function demo4(event:Event):void
			{
				trace("EventPriorityApp.demo4");
			}
		]]>
	</fx:Script>
	<event:EventPriorityButton id="eventPriorityTestButton"
							   label="事件优先级测试"
							   click="eventPriorityTestButton_clickHandler(event)"/>
</s:Application>

◇测试输出结果：

• EventPriorityApp.demo4
• EventPriorityButton.demo2
• EventPriorityButton.demo1
• EventPriorityApp.demo3
• EventPriorityApp.test4
• EventPriorityButton.test1
• EventPriorityButton.test2
• EventPriorityApp.test3

◇测试总结：

• 优先级对同一类型事件有效，对不同类型事件无效，虽然test4优先级20000高于demo4优先级10000，但是先派发demo事件，所有demo4还是先执行了
• 事件类型相同优先级相同的话谁先注册就先执行谁