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事件流机制的3个阶段来源：我要学flash网 | 作者：admin | 发表时间：2011-07-02 | 点击：162 次根据个人的学习体会，我做了大致以下总结。事件流机制主要分为3个阶段：捕获阶段、目标阶段、冒泡阶段。 1、捕获阶段：当发出一个事件对象以后，flash player会从根容器也就是舞台开始，逐层向下寻找，直到找到最内层的目标对象（target）为止。因此从舞台目标对象一直到目标对象的所有父容器都属于捕获阶段。 2、目标阶段：当找到最内层目标对象的时候，就属于目标阶段。 3、冒泡阶段：从最内层目标对象开始，逐层向上寻找直到找到舞台根容器为止，这个过程就是冒泡阶段。 注意：两个和事件目标相关的属性（target：最内层显示对象，currentTarget：当前侦听事件的容器） 下面是我个人做的小例子：
下载: Bubble.as 01./** 02. * 作者：powerboy[动力男孩] http://www. 03. * 日期： [08.9.2] 04. * 备注：事件流机制的3个阶段 05. */ 06.package { 07.import flash.display.Sprite; 08.import flash.display.DisplayObject; 09.import flash.display.DisplayObjectContainer; 10.import flash.text.TextField; 11.import flash.text.TextFieldAutoSize; 12.import flash.events.MouseEvent; 13.public class Bubble extends Sprite { 14. 15.private var txt:TextField; 16. 17.public function Bubble() { 18.txt = new TextField(); 19.txt.multiline = true; 20.txt.border = true; 21.txt.width = 500; 22.txt.height = 150; 23.txt.x = 20; 24.txt.y = 200; 25.addChild(txt); 26. 27.var roundRect:RoundRect=new RoundRect(); 28.roundRect.name = "roundRect"; 29.roundRect.fill(0x000000); 30. 31.var ellipse:Ellipse=new Ellipse(); 32.ellipse.name = "ellipse"; 33.ellipse.fill(0x00ff00); 34.ellipse.move(20,20); 35. 36.var circle:Circle=new Circle(); 37.circle.name = "circle"; 38.circle.fill(0x0000ff); 39.circle.move(100,80); 40. 41.addChild(roundRect); 42.roundRect.addChild(ellipse); 43.ellipse.addChild(circle); 44. 45.roundRect.addEventListener(MouseEvent.MOUSE_OVER,roundRectRollOverHandler,true); 46.ellipse.addEventListener(MouseEvent.MOUSE_OVER,ellipseRollOverHandler,true); 47.circle.addEventListener(MouseEvent.MOUSE_OVER,circleRollOverHandler,true); 48. 49.roundRect.addEventListener(MouseEvent.MOUSE_OVER,roundRectRollOverHandler); 50.ellipse.addEventListener(MouseEvent.MOUSE_OVER,ellipseRollOverHandler); 51.circle.addEventListener(MouseEvent.MOUSE_OVER,circleRollOverHandler); 52.} 53. 54.private function roundRectRollOverHandler(e:MouseEvent):void { 55.handleStage(e.target.name,e.currentTarget.name,e.eventPhase); 56.} 57.private function ellipseRollOverHandler(e:MouseEvent):void { 58.handleStage(e.target.name,e.currentTarget.name,e.eventPhase); 59.} 60.private function circleRollOverHandler(e:MouseEvent):void { 61.handleStage(e.target.name,e.currentTarget.name,e.eventPhase); 62.} 63.private function handleStage(target:String,currentTarget:String,eventPhase:Number):void{ 64.var str:String; 65.switch(eventPhase){ 66.case 1: 67.str = "捕获阶段 ↓"; 68.break; 69.case 2: 70.str = "目标阶段 →"; 71.break; 72.case 3: 73.str = "冒泡阶段 ↑"; 74.break; 75.} 76.txt.appendText("最内层显示对象："+target+" 当前侦听事件的容器："+currentTarget+" 事件流机制："+str+"\n"); 77.txt.scrollV = txt.maxScrollV; 78.} 79.} 80.} 81. 82.import flash.display.Sprite; 83.import flash.events.MouseEvent; 84.import flash.display.DisplayObjectContainer; 85.class MyShape extends Sprite { 86. 87.public function MyShape() { 88. 89.} 90.protected function drawing():void { 91.} 92. 93.public function fill(color:uint):void { 94.this.graphics.beginFill(color); 95.drawing(); 96.this.graphics.endFill(); 97.} 98.public function move(x:int,y:int):void { 99.this.x = x; 100.this.y = y; 101.} 102.} 103.//圆角矩形 104.class RoundRect extends MyShape { 105.public function RoundRect() { 106.super(); 107.} 108.override protected function drawing():void { 109.this.graphics.drawRoundRect(0,0,200,50,10,10); 110.} 111.} 112.//椭圆形 113.class Ellipse extends MyShape { 114.public function Ellipse() { 115.super(); 116.} 117.override protected function drawing():void { 118.this.graphics.drawEllipse(0,0,200,50); 119.} 120.} 121.//圆形 122.class Circle extends MyShape { 123.public function Circle() { 124.super(); 125.} 126.override protected function drawing():void { 127.this.graphics.drawCircle(0,0,50); 128.} 129.} |
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来自： 灵岩侠客 > 《flashas3.0》
