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

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addition, commenting the classes and methods that should behave as abstract is also important. It must be emphasized that this puts the burden on the programmer as opposed to the compiler to check if all methods that should behave as abstract are implemented. We will define abstract classes as concrete classes with the knowledge that they will not be instantiated, but will be extended by subclasses. Abstract methods will be defined simply as a function declaration that will throw an IllegalOperationError error if called. Both abstract classes and methods will be clearly identified using comments. Minimalist Example We will develop a minimalist example of a factory method pattern in ActionScript 3.0 using Flash CS3. The Project window shown in Figure 2-3 mirrors the file structure for the example. Figure 2-3. Project window for the minimalist example The Factory Method Minimalist.fla is a Flash document whose document class is defined as Main. The document class is a new feature in Flash CS3 that can be set from the Properties tab in the Properties panel of a Flash document (.fla file). This represents the class whose constructor will be automatically run by the Flash Player when the Flash movie (.swf file) is loaded. The Main class is defined in the Action- Script file called Main.as. The project also contains a package called example. Packages allow you to bundle classes together to facilitate code sharing. They also allow control over the visibility of classes and method names outside the package by using identifiers. This minimizes naming conflicts that can occur when developing applications. We will use packages to hide the product classes from direct access by clients in this example. Minimalist Example | 69
The example package contains the Product1 and Product2 classes that implement the IProduct interface. It also contains the abstract class Creator that is extended by two subclasses CreatorA and CreatorB. Each class is defined in its own file, as is the convention with ActionScript 3.0. First, let’s take a look at the product classes. Product Classes Example 2-1 through Example 2-3 show the product interface and concrete product classes. All three classes belong to the example package as indicated by the package declaration. The IProduct interface declares a method called manipulate( ) that is implemented by both product classes. True to a minimalist example, the product classes don’t do much of anything. However, make note of the class attribute. Example 2-1. IProduct.as package example { public interface IProduct { function manipulate( ):void; } } Example 2-2. Product1.as package example { internal class Product1 implements IProduct { public function manipulate( ):void { trace("Doing stuff with Product1"); } } } Example 2-3. Product2.as package example { internal class Product2 implements IProduct { public function manipulate( ):void { trace("Doing stuff with Product2"); } } } 70 | Chapter 2: Factory 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
Page 39 and 40: Example 1-7. Encap.as (continued) }
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
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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
Page 79 and 80: and ActionScript 3.0. However, the
Page 81 and 82: Figure 1-10 shows some possible fut
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Page 85 and 86: Creational Patterns Conceal creatio
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Page 89: The primary responsibility of the f
Page 93 and 94: Example 2-5. CreatorA.as (continued
Page 95 and 96: instantiate concrete products var p
Page 97 and 98: Example 2-8. IPrintjob.as package p
Page 99 and 100: Clients Note that the client doesn
Page 101 and 102: Extended Example: Color Printing Th
Page 103 and 104: Example 2-19. NewLowVolPrintCenter.
Page 105 and 106: Key OOP Concepts Used in the Factor
Page 107 and 108: to implement default behavior commo
Page 109 and 110: Example 2-26. ShapeCreator.as packa
Page 111 and 112: draw filled shapes filledShapeCreat
Page 113 and 114: checking if the projectile has gone
Page 115 and 116: Example 2-32. AlienMine.as (continu
Page 117 and 118: Example 2-34. AlienShip.as } } } }
Page 119 and 120: Example 2-36. Weapon.as (continued)
Page 121 and 122: Concrete Creator Classes Until we e
Page 123 and 124: in teamwork, the Singleton can be u
Page 125 and 126: To create a class, we need a public
Page 127 and 128: Example 3-4. Singleton.as package {
Page 129 and 130: Figure 3-3. Compiler not finding cl
Page 131 and 132: However, does that mean that only a
Page 133 and 134: Figure 3-5. Two instance labels and
Page 135 and 136: Example 3-10. Alert.as } } { Alert.
Page 137 and 138: However, had we done that, we would
Page 139 and 140: 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
Page 530:
T Tail.as, 231 Target.as, 180 Templ
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