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

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In Example 9-16, the fileVFR( ) function shows code that has been overridden, and it contains the exact same content as in the FlightPlan class. This was done intentionally to illustrate that it doesn’t matter what code you place in the fileVFR( ) method in this class. Because the hook method has changed the return string that prevents the fileVFR( ) function from executing, its content is immaterial. Unlike Java and other languages where you can create actual abstract functions, in ActionScript 3.0 (following ECMAScript standards) we have to pretend that certain methods are abstract. As part of that fiction, the fileVFR( ) method is overridden in Example 9-16. The method, fileVFR( ), could have been completely left out of the Cloudy class. It is not going to be launched because the hook method prevents it. By changing the hook return value to something other than “Nice and clear,” the fileVFR( ) method won’t launch. So the only reason that the fileVFR( ) method is included in the class at all is to help understand it as an abstract method that must be overridden by every class that subclasses the main abstract class, BajaFlight. By learning design patterns from examples where abstract functions do exist, you’ll find it easier if you have “abstract” functions of your own in your ActionScript 3.0 applications. Also, in certain design patterns such as the Template Method, the hook methods are differentiated from the abstract methods because all abstract methods must be overridden, while hook methods need to be overridden only when they’re changed by a subclass. Finally, we’re all set to test the application. Ideally, we would have received data from a weather service that we could use to indicate whether or not the conditions were favorable for VFR flight. Instead, the TestFlight class in Example 9-17 simply creates instances of both the FlightPlan and Cloudy classes. Example 9-17. TestFlight.as package { import flash.display.Sprite; public class TestFlight extends Sprite { public function TestFlight( ) { var takeOff:BajaFlight=new FlightPlan( ); takeOff.templateMethod( ); } } } var grounded:BajaFlight=new Cloudy( ); grounded.templateMethod( ); Hooking It Up | 355
Open a new Flash document, and type TestFlight into the document class window. You should see the following results: *^* Clear as a Bell *^* Doing the walk around...looking good. I'm off to Baja on a beautiful day! First I'll file a VFR flightplan *^* Cloudy *^* Doing the walk around...looking good In the first part, you can see that both of the algorithm’s operations successfully output the checkAirplane( ) and fileVFR( ) method results. However, in the Cloudy instance, only the checkAirplane( ) method invokes. This is as expected because in the Cloudy class, the checkWeather( ) hook method returned something other than “Nice and clear,” thereby canceling the fileVFR( ) operation. Summary The Template Method design pattern shows how to distribute behavior among subclasses. It leaves much of the detail work to the subclasses, but at the same time it can control the order of the algorithm making up the template method. It stands as a good example of controlling dependencies and use of the inverted control structure. As such, the Template Method has many uses where both control and flexibility are required while minimizing dependency. It is a widely used pattern, and in many abstract classes you can find some a template method at work to some degree. It’s truly a general pattern because it offers both algorithm control and subclass flexibility in implementing the class methods. The Template Method in ActionScript 3.0 is quite useful even though the language lacks abstract functions and classes. By treating the default internal functions with no content as though they are abstract operations, it’s possible to use template methods that are virtually identical to languages that feature both abstract classes and functions. Finally, hook methods offer further flexibility without really disrupting the main algorithm’s flow. These methods can act like “back doors” to the main algorithm. All the operations in the template methods stay in the same order, but they can be changed in terms of what they do, or if they’re omitted in the invocation of the template method. It’s little wonder that the Template Method, with its strong structure and flexible implementation, is so widely used. 356 | Chapter 9: Template Method 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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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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Page 345 and 346: Example 8-26. QuarterBar.as (contin
Page 347 and 348: Example 8-27. QuarterGraph.as (cont
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Page 351 and 352: Summary The real test for a design
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Page 369 and 370: Example 9-11. PlayVideo.as (continu
Page 371 and 372: Example 9-13. PlayMedia .as (contin
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Page 375: Example 9-15. FlightPlan.as (contin
Page 379 and 380: One application where the state pat
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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 and 404: Figure 10-6 shows what your video p
Page 405 and 406: Figure 10-7. Statechart with five s
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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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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