ActionScript 3.0 Design Patterns.pdf - VideoTutorials-bg.com

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ActionScript 3.0 and CSAS can work together. The ActionScript 3.0 default Action Message Format (AMF) is AMF3, but FMS2 needs AMF0. So, you need to change the ObjectEncoding class to AMF0 using the line, NetConnection.defaultObjectEncoding=flash.net.ObjectEncoding.AMF0; This line needs to be in your implementation of the State design pattern, but not in the classes that make up the pattern. (See Example 10-27) You will see in the StopState class we made for this application (Example 10-21) we need to have a key difference in the way that the NetStream.play( ) method is employed. By adding a second parameter to the method, it’s effectively changed into a CSAS method. However, because the flash.net.ObjectEncoding has been imported, the two different versions of ActionScript can work together. Flash Media Server 2 is an open socket media server available from Adobe. You can download the Developer’s Version free from http://www.adobe.com/products/flashmediaserver/ You will need to set it up in a Windows or Linuxserver environment, or just on your own computer with Windows OS. On a Macintosh, you’ll need to be in the Windows mode to set it up. Once installed on your system, just add a folder named flvstate in the applications folder of the Flash Media Server. Once that’s done, you don’t need to do anything else with the server other than make sure that it’s running when you use the FMS application. (You’ll need to follow the FMS2 documentation for the setup.) The Adaptable States The first task when working with state machine models is to update the model. Figure 10-7 shows the addition of two new states—Append and Record. The original three states are pretty much the same as before. Note that the Stop state is the central one for all transitions except for the Play-Pause toggle. To change from any state except Pause, the transition must first go to the Stop state. As noted at the outset, statecharts make it easy to see required program changes. By adding two more states, Append and Record, all the other states and contexts need to be changed as well. However, you don’t have to change a huge number of conditional statements. The testing application also needs changes, but because that code is more a user of the state machine than an actual part of the state machine, it will be handled separately. The following scripts, Examples 10-20 through 10-26, add all the necessary changes for the state machine: Adding More States and Streaming Capabilities | 383
Figure 10-7. Statechart with five states Example 10-20. State.as 1 package 2 { 3 //State Interface #1 4 import flash.net.NetStream; 5 interface State 6 { 7 function startPlay(ns:NetStream, flv:String):void; 8 function startRecord(ns:NetStream, flv:String):void; 9 function startAppend(ns:NetStream, flv:String):void; 10 function stopAll(ns:NetStream):void; 11 function doPause(ns:NetStream):void; 12 } 13 } Note that instead of naming the method for stopping the video play, it’s been changed to stopAll( ) in line 10. The reason for this is that in the different states, stopping means something different. It can mean stop recording and appending in addition to stop playing the video. So the change focuses on the fact that it’s not just to do one thing. It’s another instance where polymorphism is coming in handy. Next, the StopState class has one NetStream method that’s part of an older Action- Script, Client-Side ActionScript (CSAS) from Flash Media Server 2. In ActionScript 3. 0, the NetStream.play( ) method expects only a single argument—a string for the FLV file’s URL. However, in CSAS, you can add a second parameter to specify what type of stream to play. In order for AS 3.0 to work with classes from prior versions of ActionScript that serialize objects, the application will have to import the ObjectEncoding class. However, if that’s done, AS 3.0 can fully integrate these other objects and their parameters. Line 20 shows this second argument added to the NetStream.play( ) method. 384 | Chapter 10: State Pattern Stop Append Record Play Pause
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ActionScript 3.0 Design Patterns
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ActionScript 3.0 Design Patterns Wi
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Bill would like to dedicate this to
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Example: Sprite Factory 84 Example:
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Video Player Concrete State Applica
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Who This Book Is For We wanted to d
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What You Need to Use This Book You
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and OOP. (Working out how to conver
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Safari® Enabled When you see a Saf
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Editors Our development editor, Rob
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Design patterns provide object-orie
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that program. Like pulling a string
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Built-in State Machines: while most
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Figure 1-2. Rocket drawing Center p
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Example 1-1. TestRocket.as package
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skills that would provide the concr
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Example 1-3. PlayVideoAbstract.as (
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Hiding Your Data from Bad Consequen
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Example 1-7. Encap.as (continued) }
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Wait! There’s more! Later in this
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As you can see in Example 1-9, the
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Using Encapsulation and Design Patt
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Example 1-13. QuadPets.as (continue
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Using Interfaces and Abstract Class
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interface. You’ll need an MP3 fil
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Example 1-22. Subclass.as package {
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Example 1-25. ImplementSubChange.as
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Example 1-29. Country.as (continued
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Example 1-32. IBiz.as package { pub
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Example 1-35 has further difference
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In addition to messages in the Outp
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state here is a bit more contextual
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your client dependency leads to une
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Example 1-40. VidPlayer.as (continu
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Doing Composition To understand com
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The clearest way we’ve seen compo
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Example 1-47. Mp3.as (continued) }
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Example 1-54. TestMedia.as (continu
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and ActionScript 3.0. However, the
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Figure 1-10 shows some possible fut
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introduction to OOP, you will find
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Creational Patterns Conceal creatio
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or dependency between the Client an
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The primary responsibility of the f
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The example package contains the Pr
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Example 2-5. CreatorA.as (continued
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instantiate concrete products var p
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Example 2-8. IPrintjob.as package p
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Clients Note that the client doesn
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Extended Example: Color Printing Th
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Example 2-19. NewLowVolPrintCenter.
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Key OOP Concepts Used in the Factor
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to implement default behavior commo
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Example 2-26. ShapeCreator.as packa
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draw filled shapes filledShapeCreat
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checking if the projectile has gone
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Example 2-32. AlienMine.as (continu
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Example 2-34. AlienShip.as } } } }
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Example 2-36. Weapon.as (continued)
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Concrete Creator Classes Until we e
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in teamwork, the Singleton can be u
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To create a class, we need a public
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Example 3-4. Singleton.as package {
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Figure 3-3. Compiler not finding cl
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However, does that mean that only a
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Figure 3-5. Two instance labels and
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Example 3-10. Alert.as } } { Alert.
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However, had we done that, we would
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for playing the selected tune. If i
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MP3 file in the same folder, and re
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shipping costs. It constitutes a go
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open the Convert to Symbol dialog b
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PART III III.Structural Patterns Tr
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Chapter 4 CHAPTER 4 Decorator Patte
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like abstract classes, simply by no
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simple inheritance. Depending on ho
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Minimalist Abstract Decorator To ge
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eral months. Using a Decorator desi
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Example 4-5. DecConB.as package { /
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Applying a Simple Decorator Pattern
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If you want to create more concrete
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Example 4-15. Muff.as package { pub
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Figure 4-6. Paper doll with two dif
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Adding Properties and Methods Up to
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Decorating with Multiple Properties
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} override public function evil( ):
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Example 4-25. Compassion.as package
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Deadly sins Example 4-29. Rage.as p
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Example 4-33. Dogmatisms.as package
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class window in the Dual.fla Proper
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Example 4-37. Soul.as (continued) }
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Imagine that you are responsible fo
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Example 4-41. Accord.as (continued)
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Example 4-45. GPS.as package { publ
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Example 4-48. Deal.as 16 internal v
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Example 4-48. Deal.as 120 { 121 tra
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Figure 4-8. Decorator user interfac
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Chapter 5 CHAPTER 5 Adapter Pattern
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and their functionality to figure o
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Example 5-4. Main.as (continued) }
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Example 5-5. Adaptee.as package { p
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methods and properties to accomplis
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Example 5-9. LegacyCar.as 47 } 48 4
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ignition key of the car (assume tha
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Example 5-11. CarAdapter.as (contin
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Note that the new interface turns t
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var listField = new TextField( ); l
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Example 5-14. ListDisplayField.as 3
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Example 5-15. Main.as (document cla
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Example 5-17. Main.as (document cla
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Summary The adapter pattern allows
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objects and composite objects the s
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the components. We can think of tou
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method by tracing sName. When opera
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oot composite 1 leaf 1 leaf 2 compo
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Executing the following statements
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Example 6-6. The safeRemove( ) meth
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leaf 2 Composite 1 leaf 2 leaf 3 Di
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Example 6-9. Playlist.as (continued
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Example 6-10. Song.as 58 soundChann
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Using Inverse Kinematics Inverse ki
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Example 6-12. Composite.as package
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Example 6-14. Main.as 23 addChild(s
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The following steps relate to Figur
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Example 6-16. Tail.as package { imp
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Note how the snake is constructed u
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Example 6-18 shows the IPlane inter
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Unlike the Shape class, Sprite does
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Figure 6-9. Hierarchical tree struc
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Modifying Components to Reflect Dam
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private function showDamage(evt:Eve
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Behavioral Patterns Class Communica
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Notice the tight coupling between t
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Each envelope encapsulates a partic
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instance is passed to the construct
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Setting a Trigger to Invoke the Com
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Example 7-7. IMacroCommand.as packa
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Example 7-12. ConcreteMacroCommand.
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Example 7-14. TextButton.as package
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Example 7-15. InvokerPanel.as (cont
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Extended Example: Sharing Command O
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changes are seamlessly spread throu
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Example 7-21. IncrementCommandWithU
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Example 7-24. Client code for undoa
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Example 7-26. TextDisplayField.as (
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Example 7-28. Radio.as 44 var url =
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Example 7-30. Client code for the p
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Example 7-31. DynamicControlButtons
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adio, very much like someone progra
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Chapter CHAPTER 8 8 Observer Patter
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introduced, adding a class as part
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of an abstract class or an interfac
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works fine. What’s more, using th
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this all work right is the use of a
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Example 8-7. ConcreteSubject.as (co
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Example 8-9. TestSub.as (continued)
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} this.news=news; this.sports=sport
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Example 8-12. ConcreteSubject.as pa
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Example 8-13. ConcreteObserver.as (
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Whoaa!, the stock market is at 2987
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Example 8-17. ConcreteSubject.as pa
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Launching the Space Battle In Examp
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5. In the Symbol editing mode, drag
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Figure 8-5. Android shooting a beam
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Example 8-19. ChangeHandler.as (con
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To make the task more manageable an
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Example 8-24. ConcreteObserver.as p
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In this application, all you’re r
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Example 8-26. QuarterBar.as (contin
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Example 8-27. QuarterGraph.as (cont
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Example 8-28. DataDesign.as (contin
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Summary The real test for a design
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Page 367 and 368: Not-So-Concrete Concrete Classes Th
Page 369 and 370: Example 9-11. PlayVideo.as (continu
Page 371 and 372: Example 9-13. PlayMedia .as (contin
Page 373 and 374: When to Hook? The hook’s useful w
Page 375 and 376: Example 9-15. FlightPlan.as (contin
Page 377 and 378: Open a new Flash document, and type
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Page 385 and 386: Example 10-2. VideoWorks.as (contin
Page 387 and 388: To complete the state machine, we n
Page 389 and 390: Example 10-7. State.as package { //
Page 391 and 392: Example 10-10. VideoWorks.as (conti
Page 393 and 394: Example 10-13. TestVid.as package {
Page 395 and 396: Example 10-13. TestVid.as (continue
Page 397 and 398: Example 10-15. StopState.as (contin
Page 399 and 400: Example 10-17. PauseState.as 22 pub
Page 401 and 402: Example 10-19. TestPause.as (contin
Page 403: Figure 10-6 shows what your video p
Page 407 and 408: Example 10-22. PlayState.as 1 packa
Page 409 and 410: Example 10-24. RecordState.as 1 pac
Page 411 and 412: Example 10-26. VideoWorks.as (conti
Page 413 and 414: Example 10-27. TestFMS.as (continue
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Page 421 and 422: say that the Context class (aggrega
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Page 425 and 426: Example 11-3. ConcreteStrategy.as p
Page 427 and 428: Adding More Concrete Strategies and
Page 429 and 430: Example 11-9. Tricks.as (continued)
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Page 433 and 434: Example 11-18. Bubbles.as package {
Page 435 and 436: Simply by adding setters to the con
Page 437 and 438: Contexts for String Strategies You
Page 439 and 440: Example 11-24. StringWork.as packag
Page 441 and 442: Example 11-29. SortAll.as package {
Page 443 and 444: Example 11-33. TestStringStrategy.a
Page 446 and 447: Using More Than One Pattern PART V
Page 448 and 449: Chapter 12 CHAPTER 12 Model-View-Co
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Example 12-2. Model.as (continued)
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Example 12-5. View.as (continued) 1
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implementations in the MVC. Our vie
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Example 12-8. CompositeView.as (con
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Example 12-10. CharCodeLeafView.as
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Key OOP Concepts in the MVC Pattern
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Example 12-12. IModel.as (Model int
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Example 12-15. Controller.as (Contr
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Example 12-16. CBView.as 24 update(
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Note that only the combo boxview th
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Example 12-18. INewModel.as (contin
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Example 12-21. RBView.as package {
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add map type select radio button gr
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Example 12-23. CarModel.as (continu
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Example 12-25. RHController.as (con
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Example 12-28. Main.as (document cl
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Example 12-30. GPSView.as package {
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Example 12-32. ChaseController.as (
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Chapter 13 CHAPTER 13 Symmetric Pro
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• Indicate that a remote player h
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Even though both of the solutions a
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Referee 1 Player1 Proxy2 Internet S
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With a single template method, and
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developed with an eye to the order
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Boolean variables to false. (The fa
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Example 13-3. RPS.as (continued) }
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Example 13-4. proxygame.asc (contin
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Example 13-5. SymPlayer1.as package
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Example 13-5. SymPlayer1.as (contin
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Example 13-5. SymPlayer1.as (contin
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In addition to using the Referee to
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Example 13-6. DynamicText.as (conti
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3. Click the Text layer to select i
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A abstract classes, 28, 31, 68, 130
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increment and decrement commands, 2
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E ECOOP, 470 EmailCheck.as, 418 enc
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MapTypeController.as, 454 MapView.a
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Q QuadPets.as, 25 R Radio.as, 273 R
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T Tail.as, 231 Target.as, 180 Templ
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