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{} Mp3.as {} Media.as {} VideoFlash.as PlayVideo.as Figure 1-8. Relationships of composition, inheritance, and instantiation In turn, RecordVideo inherits from RecordMedia. At this point, we’re right back to the class to which the Media class first delegated, RecordMedia. Using composition without inheritance is difficult to imagine in most practical applications. Thus, instead of focusing on the relative advantages of each, for now consider composition and inheritance a team. In Chapter 11, we again consider this issue of favoring composition over inheritance in the context of using composition with design patterns. Maintenance and Extensibility Planning A number of years ago, we built a web site designed for change. At the time, no thought was given to design patterns, but instead we knew that the site would change based on experience, and were acutely aware of making sure that the site was set up for accepting change without having to redo it. This was a case where the plan worked too well. The site is easy to update and as a result, we really haven’t bothered to take the time to rework the site to incorporate new concepts. It’s starting to look a little old-fashioned, and we’d like to upgrade the version of Flash so that we can optimize video and all the new features in Flash CS3 {} {} RecordVideo.as {} PlayMedia.as {} RecordMedia.as {} PlayAudio.as {} RecordAudio.as delegates Instantiates Inherits Maintenance and Extensibility Planning | 57
and ActionScript 3.0. However, the plan illustrates a basic truth about software in general and web development in particular. You’re going to spend more time on maintenance and changing a site than you are building it in the first place. As a result, you need to plan for maintenance and extensibility, and not just to get things working right in the first place. Had the web site that had been planned for change been done with design patterns, not only would it be able to adapt to change, we wouldn’t have to scrap the current design and start all over from scratch to extend the site. That is, only part of the planning process should address change of a static category. You also need to plan for extending the site to incorporate more than what you originally planned to change. That is, you may need to add new materials to change. Planning Only for Maintenance While the web site described as built for change has persisted, it has not evolved. The site has been easy to maintain because its main function loads an image, a text file, and menu items for a given product. By either changing the label on an existing button or adding a button, changing and adding products is pretty simple as well. So it has a little extensibility in the sense that its not fixed to a single product. However, the site really isn’t set up for robust extensibility. For instance, adding a blog to the site or changing the way that the menus work would take the same amount of re-structuring as it would to start from scratch. So, while changing products in the site is simple, changing the site is not. Structurally, the site looks something like Figure 1-9—The Big Function. Figure 1-9. The Big Function The Big Function function BigFunction (product) { load image in SWF load text from text file load menu items into array load array into Combo box } It doesn’t matter whether the big function is directly instantiated, gained through inheritance, or a delegate of composition. It has no flexibility other than the parameter to tell it what to place on the stage. If its algorithm is changed, it could wreck havoc on its use. You can view it as tough and inflexible because it gets one job done in one way. Alternatively, the big function can be seen as dainty and fragile because of its dependency on a single routine, and because it is subject to freeze up when 58 | Chapter 1: Object-Oriented Programming, Design Patterns, and ActionScript 3.0
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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
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 and 38: 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
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: Example 1-54. TestMedia.as (continu
Page 81 and 82: Figure 1-10 shows some possible fut
Page 83 and 84: introduction to OOP, you will find
Page 85 and 86: Creational Patterns Conceal creatio
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Page 89 and 90: The primary responsibility of the f
Page 91 and 92: The example package contains the Pr
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 {
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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
Page 526 and 527:
MapTypeController.as, 454 MapView.a
Page 528 and 529:
Q QuadPets.as, 25 R Radio.as, 273 R
Page 530:
T Tail.as, 231 Target.as, 180 Templ
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