Flex组建创建的过程

<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" add="add(event)"preinitialize="preinit(event)"childAdd="childAdd(event)"initialize="init(event)" creationComplete="ccp(event)"applicationComplete="accp(event)"updateComplete="upcp(event)"><mx:Script><!--[CDATA[private var count:int=0;private function preinit(event:Event):void{trace(count+"--------"+(event.target.id)+"的preinitialize发生了");count++;}private function childAdd(event:Event):void{trace(count+"--------"+event.target.id+"的childAdd发生了");count++;}private function add(event:Event):void{trace(count+"--------"+event.target.id+"的add发生了");count++;}private function init(event:Event):void{trace(count+"--------"+event.target.id+"的initialize发生了");count++;}private function ccp(event:Event):void{trace(count+"--------"+event.target.id+"的creationComplete发生了");count++;}private function accp(event:Event):void{trace(count+"--------"+event.target.id+"的applicationComplete发生了");count++;}private function upcp(event:Event):void{trace(count+"--------"+event.target.id+"的updateComplete发生的");count++;}]]--></mx:Script><mx:Canvas id="cvs" x="107" y="53" width="200" height="200" backgroundColor="#C71F1F"add="add(event)"preinitialize="preinit(event)"childAdd="childAdd(event)"initialize="init(event)"creationComplete="ccp(event)"updateComplete="upcp(event)"><mx:Button id="btn" x="67" y="81" label="测试"add="add(event)"preinitialize="preinit(event)"initialize="init(event)"creationComplete="ccp(event)"updateComplete="upcp(event)"/></mx:Canvas></mx:Application>

输出的结果如下：

0--------null的add发生了
1--------null的preinitialize发生了
2--------null的childAdd发生了
3--------cvs的add发生了
4--------cvs的preinitialize发生了
5--------cvs的childAdd发生了
6--------btn的add发生了
7--------btn的preinitialize发生了
8--------btn的initialize发生了
9--------cvs的initialize发生了
10--------null的initialize发生了
11--------btn的creationComplete发生了
12--------btn的updateComplete发生的
13--------cvs的creationComplete发生了
14--------cvs的updateComplete发生的
15--------null的creationComplete发生了
16--------null的applicationComplete发生了
17--------null的updateComplete发生的

 

事件说明：

add:  组件被添加到容器上(addChild, addChildAt)时发出
preinitialize:  预初始化时发出
initialize:  完成构造，所有属性都被设置完成后发出
creationComplete:  完成构造，属性，测量，布局，绘制后发出
applicationComplete:  Dispatched after the Application has been initialized, processed by the LayoutManager, and attached to the display list.
=======================其他==========================
uicomponent.updateComplete :  Dispatched when an object has had its commitProperties(), measure(), and updateDisplayList() methods called (if needed).
当commitProperties(), measure(), and updateDisplayList()被调用时派发
updateDisplayList:updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void Draws the object and/or sizes and positions its children.
绘制对象的子对象的大小，位置。不可以直接调用该方法。当该组件被通过addChild方法添加到容器上或组件的invalidateDisplayList()方法被调用时，Flex会调用updateDisplayList()方法