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

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Example 1-6. TestNoEncap.as package { import flash.display.Sprite; } public class TestNoEncap extends Sprite { public var noEncap:NoEncap; public function TestNoEncap( ) { noEncap=new NoEncap( ); noEncap.dogTalk="Meow"; noEncap.showDogTalk( ); addChild(noEncap); } } Open a new Flash document file, and, in the Document class window, type in TestNoEncap. When you test the file, you’ll see “Meow” appear on the screen. Such a response from your dog object is all wrong. Dogs don’t meow and cats don’t bark. However, that’s what can happen when you don’t encapsulate your class. When you multiply that by every un-encapsulated class you use, you can imagine the mess you might have. So let’s find a fix for this. Private variables The easiest way to insure encapsulation is to use private variables. The private statement in ActionScript 3.0, whether it’s used with variables, constants or methods (functions) makes sure that only the class that defines or declares it can use it. This not only shuts out implementations that attempt to assign any value they want, but it also excludes subclasses. (This is a difference from ActionScript 2.0; so watch out for it if you’re converting an application from ActionScript 2.0 to ActionScript 3.0.) To see how the private statement will change how the application works, Example 1-7 changes the NoEncap class by adding the private statement to the variables. Example 1-7. Encap.as package { //This is GOOD OOP -- It has encapsulation import flash.text.TextField; import flash.display.Sprite; public class Encap extends Sprite { private var dogTalk:String="Woof, woof!"; private var textFld:TextField=new TextField( ); Encapsulation | 17
Example 1-7. Encap.as (continued) } } public function Encap( ) { addChild(textFld); textFld.x=100; textFld.y=100; } function showDogTalk( ) { textFld.text=dogTalk; } Also, minor changes have to be made to the test file. The supertype implemented must be changed. Example 1-8 shows the new test class, TestEncap , for the Encap class. Example 1-8. TestEncap.as package { import flash.display.Sprite; } public class TestEncap extends Sprite { public var encap:Encap public function TestEncap( ) { encap=new Encap( ); encap.dogTalk="Meow"; encap.showDogTalk( ); addChild(encap); } } Go ahead and test it by changing the Document class name to TestEncap. This time, though, you’ll get the following error in the Complier Errors panel: Line 11: 1178: Attempted access of inaccessible property dogTalk through a reference with static type Encap. Source: encap.dogTalk="Meow"; It shows the source of the error to be the line: encap.dogTalk="Meow"; That error reflects the fact that it attempted to access a private variable outside the class. To fix the script, comment out the offending line: //encap.dogTalk="Meow"; 18 | Chapter 1: Object-Oriented Programming, Design Patterns, and ActionScript 3.0
Page 2 and 3: ActionScript 3.0 Design Patterns
Page 4 and 5: ActionScript 3.0 Design Patterns Wi
Page 6: Bill would like to dedicate this to
Page 9 and 10: Example: Sprite Factory 84 Example:
Page 11 and 12: Video Player Concrete State Applica
Page 13 and 14: Who This Book Is For We wanted to d
Page 15 and 16: What You Need to Use This Book You
Page 17 and 18: and OOP. (Working out how to conver
Page 19 and 20: Safari® Enabled When you see a Saf
Page 21 and 22: Editors Our development editor, Rob
Page 23 and 24: Design patterns provide object-orie
Page 25 and 26: that program. Like pulling a string
Page 27 and 28: Built-in State Machines: while most
Page 29 and 30: Figure 1-2. Rocket drawing Center p
Page 31 and 32: Example 1-1. TestRocket.as package
Page 33 and 34: skills that would provide the concr
Page 35 and 36: Example 1-3. PlayVideoAbstract.as (
Page 37: Hiding Your Data from Bad Consequen
Page 41 and 42: Wait! There’s more! Later in this
Page 43 and 44: As you can see in Example 1-9, the
Page 45 and 46: Using Encapsulation and Design Patt
Page 47 and 48: Example 1-13. QuadPets.as (continue
Page 49 and 50: Using Interfaces and Abstract Class
Page 51 and 52: interface. You’ll need an MP3 fil
Page 53 and 54: Example 1-22. Subclass.as package {
Page 55 and 56: Example 1-25. ImplementSubChange.as
Page 57 and 58: Example 1-29. Country.as (continued
Page 59 and 60: Example 1-32. IBiz.as package { pub
Page 61 and 62: Example 1-35 has further difference
Page 63 and 64: In addition to messages in the Outp
Page 65 and 66: state here is a bit more contextual
Page 67 and 68: your client dependency leads to une
Page 69 and 70: Example 1-40. VidPlayer.as (continu
Page 71 and 72: Doing Composition To understand com
Page 73 and 74: The clearest way we’ve seen compo
Page 75 and 76: Example 1-47. Mp3.as (continued) }
Page 77 and 78: Example 1-54. TestMedia.as (continu
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Page 85 and 86: Creational Patterns Conceal creatio
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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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to inspect. So, you’re going to n
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method. The child classes just give
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Further, discussing favoring compos
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Figure 9-3. Hollywood principle Min
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tions in the main algorithm that yo
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Example 9-4. ShedMaker.as package {
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Both instances employ the templateM
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Not-So-Concrete Concrete Classes Th
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Example 9-11. PlayVideo.as (continu
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Example 9-13. PlayMedia .as (contin
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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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