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

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Example 8-14. BugleSubscribe.as (continued) } } } //Set State #1 bigNews.setType("Computer Invented","Home Team Wins", 3234.54," Mad Duck"); //Unsubscribe 2 Observers and attempt to re-subscribe current subscriber trace("\n** Larry and Shemp have unsubscribed **\n"); bigNews.unsubscribeObserver(larry); bigNews.unsubscribeObserver(shemp); //Attempt re-subscribe bigNews.subscribeObserver(mo); //Set State #2 bigNews.setType("Memory Prices Down","Game Rained Out", 2987.98," Bad Bug"); Be sure to save the BugleSubscribe.as in the same folder as the other files in the class. Then, create a new Flash document, and type in BugleSubscribe in the Document class window. When you test the application, you should see the following output: *|*Concrete Subject*|* Larry has subscribed Mo has subscribed Curly has subscribed Shemp has subscribed Larry sees that Faster Computer Invented is interesting, and learns that Home Team Wins. Whoaa!, the stock market is at 3234.54 and The Mad Duck is showing at the Bijou. Mo sees that Faster Computer Invented is interesting, and learns that Home Team Wins. Whoaa!, the stock market is at 3234.54 and The Mad Duck is showing at the Bijou. Curly sees that Faster Computer Invented is interesting, and learns that Home Team Wins. Whoaa!, the stock market is at 3234.54 and The Mad Duck is showing at the Bijou. Shemp sees that Faster Computer Invented is interesting, and learns that Home Team Wins. Whoaa!, the stock market is at 3234.54 and The Mad Duck is showing at the Bijou. ** Larry and Shemp have unsubscribed ** Mo is already a subscriber. Mo sees that Memory Prices Down is interesting, and learns that Game Rained Out. Example: Adding States and Identifying Users | 301
Whoaa!, the stock market is at 2987.98 and The Bad Bug is showing at the Bijou. Curly sees that Memory Prices Down is interesting, and learns that Game Rained Out. Whoaa!, the stock market is at 2987.98 and The Bad Bug is showing at the Bijou. As each subscription is made, you can see the observer’s name and the fact that he has subscribed. You can see that all four subscribers see identically formatted data. The formatting is the same because all the formatting is placed in the ConcreteSubject class. However, that’s easy enough to change simply by removing all of the formatting and sending raw data. The Observer design pattern makes sure that whatever information’s sent to the subscribing observers is identical as far as the state conditions are concerned, but really doesn’t care about the formatting. The data can be taken and reformatted for any purpose by the observers. It just has to be the same data. Using the unsubscribeObserver method, selected observers are removed from the subscription list using the line: bigNews.unsubscribeObserver(ConcreteObserver instance); As you can see, shemp and larry are unsubscribed between the first and second outputs using this method. Dynamically Changing States Up to this point, all the Observer patterns’ testing has been done by static assignments of values to the state setters. The purpose was to see how the structure of the pattern works, but for most practical applications using Flash and ActionScript 3.0, we should look at something where the state values are rapidly changing, and new updates have to be sent almost constantly. To see how rapidly changing data can be sent to a single source, and then dispatched to multiple observers, this next application depicts an action game with three combatants. Two are made up of spaceships with a missile or torpedo and a space station that shoots a beam at the spaceships. There’s really nothing much you can do with the game other than fire from the two spaceships and space station, and watch the two spaceships get destroyed, but it serves to illustrate how all of the hits are generated by the action on the stage and broadcast to the different combatants. When a combatant is knocked out of play, he’s no longer subscribed and all that is visible is the last message before destruction. Recording a Space Battle In setting up this particular Observer application, the Subject and Observer interfaces contain only Number and String parameters in the observer notification and 302 | Chapter 8: Observer Pattern
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ActionScript 3.0 Design Patterns
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ActionScript 3.0 Design Patterns Wi
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Bill would like to dedicate this to
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Example: Sprite Factory 84 Example:
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Video Player Concrete State Applica
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Who This Book Is For We wanted to d
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What You Need to Use This Book You
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and OOP. (Working out how to conver
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Safari® Enabled When you see a Saf
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Editors Our development editor, Rob
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Design patterns provide object-orie
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that program. Like pulling a string
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Built-in State Machines: while most
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Figure 1-2. Rocket drawing Center p
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Example 1-1. TestRocket.as package
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skills that would provide the concr
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Example 1-3. PlayVideoAbstract.as (
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Hiding Your Data from Bad Consequen
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Example 1-7. Encap.as (continued) }
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Wait! There’s more! Later in this
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As you can see in Example 1-9, the
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Using Encapsulation and Design Patt
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Example 1-13. QuadPets.as (continue
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Using Interfaces and Abstract Class
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interface. You’ll need an MP3 fil
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Example 1-22. Subclass.as package {
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Example 1-25. ImplementSubChange.as
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Example 1-29. Country.as (continued
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Example 1-32. IBiz.as package { pub
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Example 1-35 has further difference
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In addition to messages in the Outp
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state here is a bit more contextual
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your client dependency leads to une
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Example 1-40. VidPlayer.as (continu
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Doing Composition To understand com
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The clearest way we’ve seen compo
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Example 1-47. Mp3.as (continued) }
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Example 1-54. TestMedia.as (continu
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and ActionScript 3.0. However, the
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Figure 1-10 shows some possible fut
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introduction to OOP, you will find
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Creational Patterns Conceal creatio
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or dependency between the Client an
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The primary responsibility of the f
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The example package contains the Pr
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Example 2-5. CreatorA.as (continued
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instantiate concrete products var p
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Example 2-8. IPrintjob.as package p
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Clients Note that the client doesn
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Extended Example: Color Printing Th
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Example 2-19. NewLowVolPrintCenter.
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Key OOP Concepts Used in the Factor
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to implement default behavior commo
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Example 2-26. ShapeCreator.as packa
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draw filled shapes filledShapeCreat
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checking if the projectile has gone
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Example 2-32. AlienMine.as (continu
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Example 2-34. AlienShip.as } } } }
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Example 2-36. Weapon.as (continued)
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Concrete Creator Classes Until we e
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in teamwork, the Singleton can be u
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To create a class, we need a public
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Example 3-4. Singleton.as package {
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Figure 3-3. Compiler not finding cl
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However, does that mean that only a
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Figure 3-5. Two instance labels and
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Example 3-10. Alert.as } } { Alert.
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However, had we done that, we would
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for playing the selected tune. If i
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MP3 file in the same folder, and re
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shipping costs. It constitutes a go
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open the Convert to Symbol dialog b
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PART III III.Structural Patterns Tr
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Chapter 4 CHAPTER 4 Decorator Patte
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like abstract classes, simply by no
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simple inheritance. Depending on ho
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Minimalist Abstract Decorator To ge
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eral months. Using a Decorator desi
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Example 4-5. DecConB.as package { /
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Applying a Simple Decorator Pattern
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If you want to create more concrete
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Example 4-15. Muff.as package { pub
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Figure 4-6. Paper doll with two dif
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Adding Properties and Methods Up to
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Decorating with Multiple Properties
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} override public function evil( ):
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Example 4-25. Compassion.as package
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Deadly sins Example 4-29. Rage.as p
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Example 4-33. Dogmatisms.as package
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class window in the Dual.fla Proper
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Example 4-37. Soul.as (continued) }
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Imagine that you are responsible fo
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Example 4-41. Accord.as (continued)
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Example 4-45. GPS.as package { publ
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Example 4-48. Deal.as 16 internal v
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Example 4-48. Deal.as 120 { 121 tra
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Figure 4-8. Decorator user interfac
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Chapter 5 CHAPTER 5 Adapter Pattern
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and their functionality to figure o
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Example 5-4. Main.as (continued) }
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Example 5-5. Adaptee.as package { p
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methods and properties to accomplis
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Example 5-9. LegacyCar.as 47 } 48 4
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ignition key of the car (assume tha
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Example 5-11. CarAdapter.as (contin
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Note that the new interface turns t
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var listField = new TextField( ); l
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Example 5-14. ListDisplayField.as 3
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Example 5-15. Main.as (document cla
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Example 5-17. Main.as (document cla
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Summary The adapter pattern allows
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objects and composite objects the s
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the components. We can think of tou
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method by tracing sName. When opera
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oot composite 1 leaf 1 leaf 2 compo
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Executing the following statements
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Example 6-6. The safeRemove( ) meth
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leaf 2 Composite 1 leaf 2 leaf 3 Di
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Example 6-9. Playlist.as (continued
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Example 6-10. Song.as 58 soundChann
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Using Inverse Kinematics Inverse ki
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Example 6-12. Composite.as package
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Example 6-14. Main.as 23 addChild(s
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The following steps relate to Figur
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Example 6-16. Tail.as package { imp
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Note how the snake is constructed u
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Example 6-18 shows the IPlane inter
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Unlike the Shape class, Sprite does
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Figure 6-9. Hierarchical tree struc
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Modifying Components to Reflect Dam
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private function showDamage(evt:Eve
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Behavioral Patterns Class Communica
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Notice the tight coupling between t
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Page 277 and 278: Example 7-7. IMacroCommand.as packa
Page 279 and 280: Example 7-12. ConcreteMacroCommand.
Page 281 and 282: Example 7-14. TextButton.as package
Page 283 and 284: Example 7-15. InvokerPanel.as (cont
Page 285 and 286: Extended Example: Sharing Command O
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Page 289 and 290: Example 7-21. IncrementCommandWithU
Page 291 and 292: Example 7-24. Client code for undoa
Page 293 and 294: Example 7-26. TextDisplayField.as (
Page 295 and 296: Example 7-28. Radio.as 44 var url =
Page 297 and 298: Example 7-30. Client code for the p
Page 299 and 300: Example 7-31. DynamicControlButtons
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Page 313 and 314: Example 8-7. ConcreteSubject.as (co
Page 315 and 316: Example 8-9. TestSub.as (continued)
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Page 319 and 320: Example 8-12. ConcreteSubject.as pa
Page 321: Example 8-13. ConcreteObserver.as (
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Page 331 and 332: Figure 8-5. Android shooting a beam
Page 333 and 334: Example 8-19. ChangeHandler.as (con
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Page 341 and 342: Example 8-24. ConcreteObserver.as p
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Page 345 and 346: Example 8-26. QuarterBar.as (contin
Page 347 and 348: Example 8-27. QuarterGraph.as (cont
Page 349 and 350: Example 8-28. DataDesign.as (contin
Page 351 and 352: Summary The real test for a design
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Page 363 and 364: Example 9-4. ShedMaker.as package {
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Page 369 and 370: Example 9-11. PlayVideo.as (continu
Page 371 and 372: Example 9-13. PlayMedia .as (contin
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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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