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update functions. The subscribe and unsubscribe functions are the same as previous Observer designs in this chapter. Save the classes in Example 8-15 and Example 8-16 by their caption names. Example 8-15. Subject.as package { //Subject Interface public interface Subject { function subscribeObserver(o:Observer):void; function unsubscribeObserver(o:Observer):void; function notifyObserver(score:Number,damage:String):void; } } Example 8-16. Observer.as package { //Observer Interface public interface Observer { function update(score:Number,damage:String):void; } } Giving More Work to the Concrete Classes The two classes representing concrete subjects and observers are changed little from previous examples. The ConcreteSubject class still keeps track of who has subscribed and unsubscribed, and sends out notifications of state changes. The ConcreteObserver class, though, has taken on another responsibility. When a new ConcreteObserver is created, it makes sense to automatically subscribe her to the notification process. So instead of making it a two-step process, one to instantiate and another to subscribe, the ConcreteObserver now automatically subscribes new instances. To do this, only a single line had to be added to the constructor function: concreteObserver.subscribeObserver(this); The parameter references the instance being instantiated. At any time, the instance can unsubscribe or resubscribe by calling the unsubscribe or subscribe functions. Example 8-17 and Example 8-18 should be saved using the caption names. Dynamically Changing States | 303
Example 8-17. ConcreteSubject.as package { //Concrete Subject public class ConcreteSubject implements Subject { private var score:Number; private var damage:String; private var duplicate:Boolean; private var observers:Array; public function ConcreteSubject ( ) { observers=new Array( ); } //Subscribe observer without duplicates public function subscribeObserver (obserNow:Observer):void { duplicate=false; for (var ob=0; ob < observers.length; ob++) { if (observers[ob] == obserNow) { duplicate=true; trace ("Sorry, " + observers[ob].nomDeGuerre + " is already subscribed."); } } if (! duplicate) { observers.push (obserNow); } } //Unsubscribe observer public function unsubscribeObserver (obserNow:Observer):void { for (var ob=0; ob < this.observers.length; ob++) { if (observers[ob] == obserNow) { trace ("\n***" + this.observers[ob].nomDeGuerre + " has been removed.***\n"); observers.splice (ob,1); } } } //Notify observers of total score and current damage public function notifyObserver (score:Number,damage:String):void { for (var notify in observers) { observers[notify].update (score,damage); 304 | Chapter 8: Observer Pattern
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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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Page 277 and 278: Example 7-7. IMacroCommand.as packa
Page 279 and 280: Example 7-12. ConcreteMacroCommand.
Page 281 and 282: Example 7-14. TextButton.as package
Page 283 and 284: Example 7-15. InvokerPanel.as (cont
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Page 289 and 290: Example 7-21. IncrementCommandWithU
Page 291 and 292: Example 7-24. Client code for undoa
Page 293 and 294: Example 7-26. TextDisplayField.as (
Page 295 and 296: Example 7-28. Radio.as 44 var url =
Page 297 and 298: Example 7-30. Client code for the p
Page 299 and 300: Example 7-31. DynamicControlButtons
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Page 313 and 314: Example 8-7. ConcreteSubject.as (co
Page 315 and 316: Example 8-9. TestSub.as (continued)
Page 317 and 318: } this.news=news; this.sports=sport
Page 319 and 320: Example 8-12. ConcreteSubject.as pa
Page 321 and 322: Example 8-13. ConcreteObserver.as (
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Page 333 and 334: Example 8-19. ChangeHandler.as (con
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Page 345 and 346: Example 8-26. QuarterBar.as (contin
Page 347 and 348: Example 8-27. QuarterGraph.as (cont
Page 349 and 350: Example 8-28. DataDesign.as (contin
Page 351 and 352: Summary The real test for a design
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Page 363 and 364: Example 9-4. ShedMaker.as package {
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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
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Example 9-15. FlightPlan.as (contin
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Open a new Flash document, and type
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One application where the state pat
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tive Simulation by Jonathan Kaye an
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For example, with a two-state machi
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Example 10-2. VideoWorks.as (contin
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To complete the state machine, we n
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Example 10-7. State.as package { //
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Example 10-10. VideoWorks.as (conti
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Example 10-13. TestVid.as package {
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Example 10-13. TestVid.as (continue
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Example 10-15. StopState.as (contin
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Example 10-17. PauseState.as 22 pub
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Example 10-19. TestPause.as (contin
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Figure 10-6 shows what your video p
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Figure 10-7. Statechart with five s
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Example 10-22. PlayState.as 1 packa
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Example 10-24. RecordState.as 1 pac
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Example 10-26. VideoWorks.as (conti
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Example 10-27. TestFMS.as (continue
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Chapter CHAPTER 11 11 Strategy Patt
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say that the Context class (aggrega
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etween the context classes and the
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Example 11-3. ConcreteStrategy.as p
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Adding More Concrete Strategies and
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Example 11-9. Tricks.as (continued)
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Even though we’ve discussed some
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Example 11-18. Bubbles.as package {
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Simply by adding setters to the con
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Contexts for String Strategies You
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Example 11-24. StringWork.as packag
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Example 11-29. SortAll.as package {
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Example 11-33. TestStringStrategy.a
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Using More Than One Pattern PART V
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Chapter 12 CHAPTER 12 Model-View-Co
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triggered by a user interacting wit
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grouped together in a tabbed panel
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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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