FLEX SDK 源码
Flex 4 SDK源码浅析！
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/*
*Description:PV3D类继承体系结构
*Auther:崇崇-天真的好蓝啊
*MSN:chongchong2008@msn.com
*Blog:chongchong2008
*Dates:2009-06-02
*Copyright:ChongChong2008 YiChang HuBei China
*/
Flex 4 SDK源码浅析！
最近下了Flex 4 SDK （flex_sdk_4.0.0.7219_mpl_src）的源代码
此目录下包含如下相关的几个部分：
1。mx 核心 frameworks，它在以下目录可以找到
flex_sdk_4.0.0.7219_mpl_src -- > frameworks -- > projects --> framework --> src --> mx
2。rpc frameworks，它在以下目录可以找到
flex_sdk_4.0.0.7219_mpl_src -- > frameworks -- > projects --> rpc --> src --> mx
3。air framework，它在以下目录可以找到
flex_sdk_4.0.0.7219_mpl_src -- > frameworks -- > projects --> airframework --> src --> mx
4。皮肤相关，它在以下目录可以找到
flex_sdk_4.0.0.7219_mpl_src -- > frameworks -- > projects --> haloclassic --> src
一。熟悉Flex SDK
Flex SDK真的很庞大，包罗万象，一开始真的很难入手，不知道从哪里开始读。
首先是熟悉Flex定义的基本接口，把各个接口都看一遍。就是在flex_sdk_4.0.0.7219_mpl_src -- > frameworks -- > projects --> framework --> src --> mx -->core 里面的基本接口文件，熟悉Flex的UIComponent组件，Container容器，特别是要熟悉Application类（如何与SystemManager类建立联系，组建是如何进入队列，怎样延迟调用）。
熟悉UICommpontent
public function callLater(method:Function,args:Array /* of Object */ = null):void {
methodQueue.push(new MethodQueueElement(method, args));
var sm:ISystemManager = systemManager;
if (sm && (sm.stage || sm.useSWFBridge()))
{
if (!listeningForRender)
{
sm.addEventListener(FlexEvent.RENDER, callLaterDispatcher);
sm.addEventListener(FlexEvent.ENTER_FRAME, callLaterDispatcher);
listeningForRender = true;
}
if (sm.stage)
sm.stage.invalidate();
}
}
熟悉FlexModuleFactory类的运作方式，系统单件类的注册，如何加载模块。
addFrameScript(docFrame, docFrameHandler);
// Frame 1: module factory
// Frame 2: document class
// Frame 3+: extra classes
for (i = docFrame + 1; i < totalFrames; i++){
addFrameScript(i, extraFrameHandler);
}
接下来看Flex定义的管理接口，在flex_sdk_4.0.0.7219_mpl_src -- > frameworks -- > projects --> framework --> src --> mx -->managers里面，这个要先熟悉，才能知道Application是怎么运行的，这里的东西有些复杂，得认真看。特别是要认真的读SystemManager这块，这块就如同基本接口里的UIComponent一样重要。
还有一些概念要熟悉，需要知道什么是document,swfRoot,sandboxRoot,topLevelSystemManager。
Flex Application 运行：
=======================================================
FlexApplicationBootstrap.as
==================================
package mx.core{
import flash.display.DisplayObject;
import flash.events.Event;
import mx.events.FlexEvent;
[ExcludeClass]
public class FlexApplicationBootstrap extends FlexModuleFactory{
include "../core/Version.as";
public function FlexApplicationBootstrap(){
addEventListener("ready", readyHandler);
super();
}
public function readyHandler(event:Event):void{
removeEventListener("ready", readyHandler);
var o:Object = create();
if (o is DisplayObject){
addChild(DisplayObject(o));
o.dispatchEvent(new FlexEvent(FlexEvent.APPLICATION_COMPLETE));
}
}
}
}
=======================================================
FlexModuleFactory.as
=======================================================
package mx.core{
[ExcludeClass]
/**
* @private
*/
public class FlexModuleFactory extends MovieClip implements IFlexModuleFactory, ITextLineCreator{
private static const INIT_STATE:int = 0;
private static const RSL_START_LOAD_STATE:int = 1;
private static const APP_LOAD_STATE:int = 2;
private static const APP_START_STATE:int = 3;
private static const APP_RUNNING_STATE:int = 4;
private static const ERROR_STATE:int = 5;
private static const RSL_LOADING_STATE:int = 6;
public function FlexModuleFactory(){
super();
var rsls:Array = info()["rsls"];
var cdRsls:Array = info()["cdRsls"];
// Put cross-domain RSL information in the RSL list.
var rslList:Array = [];
var n:int;
var i:int;
if (cdRsls && cdRsls.length > 0){
var crossDomainRSLItem:Class = Class(getDefinitionByName("mx.core::CrossDomainRSLItem"));
n = cdRsls.length;
for (i = 0; i < n; i++){
var cdNode:Object = new crossDomainRSLItem(
cdRsls[i]["rsls"],
cdRsls[i]["policyFiles"],
cdRsls[i]["digests"],
cdRsls[i]["types"],
cdRsls[i]["isSigned"]);
rslList.push(cdNode);
}
}
if (rsls != null && rsls.length > 0){
n = rsls.length;
for (i = 0; i < n; i++)
{
var node:RSLItem = new RSLItem(rsls[i].url);
rslList.push(node);
}
}
rslListLoader = new RSLListLoader(rslList);
mixinList = info()["mixins"];
stop();
loaderInfo.addEventListener(Event.COMPLETE, moduleCompleteHandler);
var docFrame:int = totalFrames == 1 ? 0 : 1;
addFrameScript(docFrame, docFrameHandler);
// Frame 1: module factory
// Frame 2: document class
// Frame 3+: extra classes
for (i = docFrame + 1; i < totalFrames; i++)
{
addFrameScript(i, extraFrameHandler);
}
timer = new Timer(100);
timer.addEventListener(TimerEvent.TIMER, timerHandler);
timer.start();
update();
}
public function create(... params):Object
{
var mainClassName:String = info()["mainClassName"];
if (mainClassName == null)
{
var url:String = loaderInfo.loaderURL;
var dot:Number = url.lastIndexOf(".");
var slash:Number = url.lastIndexOf("/");
mainClassName = url.substring(slash + 1, dot);
}
var mainClass:Class = Class(getDefinitionByName(mainClassName));
return mainClass? new mainClass() : null;
}
public function info():Object
{
return {};
}
private function docFrameHandler(event:Event = null):void
{
// Register singleton classes.
// Note: getDefinitionByName() will return null
// if the class can't be found.
Singleton.registerClass("mx.managers::IBrowserManager",
Class(getDefinitionByName("mx.managers::BrowserManagerImpl")));
Singleton.registerClass("mx.managers::ICursorManager",
Class(getDefinitionByName("mx.managers::CursorManagerImpl")));
Singleton.registerClass("mx.managers::IDragManager",
Class(getDefinitionByName("mx.managers::DragManagerImpl")));
Singleton.registerClass("mx.managers::IHistoryManager",
Class(getDefinitionByName("mx.managers::HistoryManagerImpl")));
Singleton.registerClass("mx.managers::ILayoutManager",
Class(getDefinitionByName("mx.managers::LayoutManager")));
Singleton.registerClass("mx.managers::IPopUpManager",
Class(getDefinitionByName("mx.managers::PopUpManagerImpl")));
Singleton.registerClass("mx.resources::IResourceManager",
Class(getDefinitionByName("mx.resources::ResourceManagerImpl")));
Singleton.registerClass("mx.styles::IStyleManager",
Class(getDefinitionByName("mx.styles::StyleManagerImpl")));
Singleton.registerClass("mx.styles::IStyleManager2",
Class(getDefinitionByName("mx.styles::StyleManagerImpl")));
Singleton.registerClass("mx.managers::IToolTipManager2",
Class(getDefinitionByName("mx.managers::ToolTipManagerImpl")));
appReady = true;
// The resources must be installed before update() creates components
// (such as DateChooswer) that might need them immediately.
installCompiledResourceBundles();
update();
if (currentFrame < totalFrames)
deferredNextFrame();
}
private function deferredNextFrame():void
{
if (currentFrame + 1 <= framesLoaded)
{
nextFrame();
}
else
{
// Next frame isn't baked yet, we'll check back...
nextFrameTimer = new Timer(100);
nextFrameTimer.addEventListener(TimerEvent.TIMER,
nextFrameTimerHandler);
nextFrameTimer.start();
}
}
private function extraFrameHandler(event:Event = null):void
{
var frameList:Object = info()["frames"];
if (frameList && frameList[currentLabel])
{
var c:Class;
try
{
c = Class(getDefinitionByName(frameList[currentLabel]));
c["frame"](this);
}
catch(e:Error)
{
}
}
if (currentFrame < totalFrames)
deferredNextFrame();
}
private function timerHandler(event:TimerEvent):void
{
if (totalFrames > 2 && framesLoaded >= 2 ||
framesLoaded == totalFrames)
{
appLoaded = true;
}
update();
}
private function nextFrameTimerHandler(event:TimerEvent):void
{
if (currentFrame + 1 <= framesLoaded)
{
nextFrame();
nextFrameTimer.removeEventListener(TimerEvent.TIMER,
nextFrameTimerHandler);
// stop the timer
nextFrameTimer.reset();
}
}
}
}
二。Flex继承体系
比较重要的类和接口在flex_sdk_4.0.0.7219_mpl_src -- > frameworks -- > projects --> framework --> src --> mx -->core
1。接口继承体系，从底层接口到高层接口如下：
IFlexDisplayObject --> IBitmapDrawable, IEventDispatcher
IUIComponent --> IFlexDisplayObject
IContainer --> IUIComponent
IDeferredInstantiationUIComponent --> IUIComponent
IButton --> IUIComponent
IBorder
IRectangularBorder -- > IBorder
ILayoutElement --> IEventDispatcher
IID
IRawChildrenContainer
IChildList
IConstraintClient
IDataRenderer
IEmbeddedFontRegistry
IFontContextComponent
IFactory
IFlexModule
IFlexModuleFactory
IInvalidating
IProgrammaticSkin
对flash本身的包装
IDisplayObjectInterface
IInteractiveObjectInterface
IDisplayObjectContainerInterface
内部命名空间
mx_internal
2。类继承体系
FlexSprite --> Sprite
UIComponent --> FlexSprite implements IAutomationObject, IChildList, IConstraintClient,
IDeferredInstantiationUIComponent, IFlexDisplayObject, IFlexModule, IID,
IInvalidating, ILayoutManagerClient, IPropertyChangeNotifier,
IRepeaterClient, IStateClient, IAdvancedStyleClient, IToolTipManagerClient,
IUIComponent, IValidatorListener, IVisualElement, ILayoutElement
Container --> UIComponent implements IContainer, IDataRenderer,
IFocusManagerContainer, IListItemRenderer,
IRawChildrenContainer, IChildList, IVisualElementContainer
LayoutContainer --> Container implements IConstraintLayout
LayoutManager --> EventDispatcher implements ILayoutManager
ClassFactory implements IFactory
全局类：
FlexGlobals
UIComponentGlobals
ContainerGlobals
SystemManagerGlobals
Singleton(Flex单件类，静态类型，很多地方都会引用到)
应用程序相关：
Application --> LayoutContainer
FlexApplicationBootstrap --〉FlexModuleFactory
系统管理相关：
ISystemManager --> IEventDispatcher, IChildList, IFlexModuleFactory
SystemManager --> MovieClip implements IChildList, IFlexDisplayObject, IFlexModuleFactory,
ISWFBridgeProvider, ISystemManager, ITextLineCreator
SystemManagerProxy --> SystemManager
SystemRawChildrenList implements IChildList
拖动管理相关：
IDragManager
DragManagerImpl implements IDragManager
DragManager
DragProxy --> UIComponent
DragSource
DragEvent --> MouseEvent
其他还有ToolTipManager，CursorManager，FocusManager，PopUpManager，LayoutManager，BrowserManager，HistoryManager
三。事件钩子，函数调用队列以及单件
Flex SDK内部大量的用到单件，事件钩子，队列调用。
Singleton.registerClass(
"mx.resources::IResourceManager",
Class(getDefinitionByName("mx.resources::ResourceManagerImpl"))
);
。。。。。未完