Introduction to Actionscript3

Technology overview AVM1 and AVM2 AS3 new features AS2 migration to AS3 Coding samples Performance tips The future Questions

Flash Player 2 – timeline control commands Flash Player 3 – load movie Flash Player 4 – Full scripting implementation (Actions, loops, variables, conditions) Flash Player 5- AS1 (prototyped based on ECMA, procedural and OOP) Flash Player 6 – AS1 + Events model, RTMP support, minor language improvements

Flash Player 7 – AS2 introduction (ECMA4), inheritance, CSS support , FP6 support Flash Player 8 – AS1/AS2 improvements, mostly graphical, File uploads Flash Player 9(8.5) – AS3 introduction, AVM2, JIT compilation, Binary sockets, E4X, RegEx Flash Player 10, AIR – the future

Introduced September 2003 – Flash MX 2004 Features Compile time type checking Class based syntax Strict typing Inheritance ECMA 4 partially

Introduced June 2006 – Adobe Flex 2 Features New AVM2 2 AVMs in FP9 player Performance improvement New bytecode compilation Packages support ECMA4 completely

Performance Using strict typing Complete rewritten AVM Comparison example Sophistication Complete class support No hacks needed

Evolution of Actionscript 2.0 Full re-engineered for performance Final and Dynamic classes Runtime exception E4X RegEx

Type declaration required (warning) Public, internal, protected, private, final Packages Constants Int, Uint * vs. Object … parameter More runtime and compile time errors For each in (E4X)

Completely re-write and organize More object oriented Event Model Display tree exposed Binary Socket Binary Data – Bytes Array More: http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/migration.html

Display objects treated as objects Reparenting Handling without display Resource management… Dynamic content, removing idle actions Loaded content (untrusted content) System.totalmemory (process memory info) Weak reference – listeners, Dictionary Garbage collection reference: http://www.adobe.com/devnet/flashplayer/articles/garbage_collection.html

Flash CS3 Flex 3 Actionscript project Flex project Flex SDK – open source Flex SDK for player 10 beta

FP9 SWF FP10 SWF Air application Projector application

Http Server side scripts (ASP, PHP), SOAP, REST Images, Progressive download File reference RTMP FMS, Red5 – streaming Flash remoting

Binary Sockets + binary data TCP, FTP, SMTP etc… External Interface Desktop application wrapper, Javascript Local Connection Communication between movies AVM1 – AVM2 AIR

Say goodbye to: attachAudio, attachBitmap, attachMovie, createEmptyMovieClip, createTextField, duplicateMovieClip, swapDepths, removeMovieClip Say hello to: DisplayObjectContainer, addChild, removeChild

DisplayObject – base class, cannot contain additional DisplayObject InteractiveObject – supporting user interaction, such as buttons and text fields DisplayObjectContainer – can contain additional DisplayObject MovieClip – sprite with timeline root => stage Examples…

AS2 Callback : onLoad, onData, onPress Events: addListener AS3 Events Model Decoupling Asynchronic execution No more Delegation

Event System Event dispatcher Event listener Event object EventDispatcher class addEventListener dispatchEvent removeEventListener … Example…

Event Propagation Capture At target Bubbling Example… Event Object Creating custom events Example…

XML Structure Tree structure of data, built by nodes, properties and values XML Loading URLLoader, URLRequest XML Example… XML Reading XML Filtering

XML Reading XML – direct data access XMLList – indirect data access (for each in, for) Children() Attributes() Attribute(attName:String) XML Filtering Node values (name == value) Attributes (@attName == value) Examples…..

Flash Player 10 Communication File system access Etc. Actionscript 4.0 Array typing Union typing More primitives ECMA 4 compatible (December 2008 spec release) And many more…..

Introduction to Actionscript3

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