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

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User’s Guide This book, at its core, is an introduction to a relatively advanced topic for writing reusable OOP code for ActionScript 3.0. Like “jumbo shrimp,” an “elementary introduction to an advanced topic” is an oxymoron. Advanced developers may want less of the elementary and less senior developers may demand more preparatory materials. Because we cannot measure any reader’s level, we urge you to go through the Table of Contents and flip through the chapters to find what you want. Find your level and use the book at that level. For some, it will be an exercise of reading from cover to cover, while for others it will be a reference work for looking up how ActionScript 3.0 works with different features of design patterns. After all, it’s your book, and you should use it to best suit your needs. Flex 2 developers We developed all the examples for this book using Flash CS3. So, if you’re looking to use these examples for Flex 2, you’ll need to make the appropriate Flex adjustments. In some cases, examples were developed using user-created movie clip classes in the Flash CS3 IDE and stored in the Library panel. These cannot be employed directly using Flex 2. So, if you’re using Flex 2, plan on some workarounds. Flash Media Server 2 developers We have a few examples that use Flash Media Server 2 (FMS2). The examples don’t require anything more than the Developers Version of FMS2. The Developers Version can be freely downloaded from the Adobe site at http://www.adobe.com/devnet/ flashmediaserver/. Alternatively, you can skip the examples, or substitute some other open socket technology. Companion Tools You’ll Want In an ideal world, those reading this book would have a solid background in object oriented programming and ActionScript 3.0. However, ActionScript 3.0 was released in a non-beta format in Flex2 only about sixmonths before this book, and in Flash at about the same time this book was published. So, you may not be familiar with ActionScript 3.0, and this book is not a tutorial in ActionScript 3.0. At a minimum, you will want to keep the ActionScript 3.0 Reference Guide handy along with any other ActionScript 3.0 documentation that comes with Flash CS3. We strongly urge you to get a copy of Design Patterns: Elements of Reusable Object- Oriented Software sooner or later. At a minimum, check it out of your library. Another book we found to be invaluable is the wonderfully fun and enlightening book, Head First Design Patterns by Eric and Elisabeth Freeman (O’Reilly, 2004). All the examples are in Java, but even so, you’ll learn a great deal about design patterns Preface | xv
and OOP. (Working out how to convert the Java examples to ActionScript 3.0 will teach you a lot about ActionScript 3.0 as well—however, before tackling the Java translations, be sure to go over the design pattern examples in this book.) If you don’t have a good ActionScript 3.0 book yet, get one. We can recommend ActionScript 3.0 Cookbook by Joey Lott, Darron Schall, and Keith Peters (O’Reilly, 2006) and Essential ActionScript 3.0 by Colin Moock (O’Reilly, 2007). For a very brief introduction to ActionScript 3.0, take a look at the Short Cut publication, ActionScript 3.0 Programming: Overview, Getting Started, and Examples of New Concepts by Bill Sanders (O’Reilly, 2007). Also, you’ll want an ActionScript 3.0 book on object-oriented programming. We’ve included an introduction to OOP in Chapter 1 that will suffice for now, and both the Moock and Lott books have some great OOP materials as well. However, a book dedicated to OOP concepts should be part of your library if you plan to write programs on the level of design patterns. Conventions Used in This Book The following typographical conventions are used in this book: Plain text Indicates menu titles, menu options, menu buttons, and keyboard accelerators (such as Alt and Ctrl). Bold Indicates text that should be entered by the user. Italic Indicates new terms, URLs, email addresses, filenames, file extensions, pathnames, directories, and Unix utilities. Constant width Indicates commands, options, switches, variables, attributes, keys, functions, types, classes, namespaces, methods, modules, properties, parameters, values, objects, events, event handlers, XML tags, HTML tags, or the output from commands. Constant width bold Shows commands that should be typed literally by the user. Constant width italic Shows text that should be replaced with user-supplied values. xvi | Preface This icon signifies a tip, suggestion, or general note. This icon indicates a warning or caution.
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: What You Need to Use This Book You
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 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
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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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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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