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

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Example 13-5. SymPlayer1.as (continued) } } public function setButton( ):void { moveBtn=new MoveButton("Make Move",0xcccccc); moveBtn.name="move"; addChild(moveBtn); moveBtn.x=100; moveBtn.y=50; } All the text fields and buttons are user classes and they need to be built prior to testing the class. In the section “Supporting Classes and Document Files” later in the chapter, you will find the necessary classes for including the buttons and dynamic text fields. Move Making rockBtn=new MoveButton("Rock",0xcccccc); rockBtn.name="rock"; addChild(rockBtn); rockBtn.x=100; rockBtn.y=80; paperBtn=new MoveButton("Paper",0xcccccc); paperBtn.name="paper"; addChild(paperBtn); paperBtn.x=150; paperBtn.y=80; scissorsBtn=new MoveButton("Scissors",0xcccccc); scissorsBtn.name="scissors"; addChild(scissorsBtn); scissorsBtn.x=200; scissorsBtn.y=80; connect=new Connect( ); addChild(connect); connect.x=175; connect.y=250; While the player class may seem fairly long and unwieldy, its key elements are quite simple. Everything is focused on making one of three moves—rock, paper, or scissors. Each move is nothing more than a string. Event to move The first step is encapsulated in the makeMove( ) function that’s launched by a button event. Using the name of the button (not the label), an algorithm finds which of the Player-Proxy Classes | 491
three moves has been selected, or if the Move button is clicked. To simplify matters, all name properties are lowercase while the label properties begin with an uppercase letter. (e.g., Rock=label, rock=name). The Move button is included to let the user change her mind after selecting one of the three moves. By clicking the Move button, the player commits to the selected move by launching two methods, doMove( ) and localMove( ). Dual moves The function to actually make a move once its been selected by clicking the Move button sends the move to the proxy using doMove( ), and stores it locally in a variable with localMove( ). This is the heart of the Symmetric Proxy. The symmetry lies in the fact that all moves are sent to both the local and proxy players. The local move checks to be sure that the local player has not moved yet, and then checks to see if the other side has moved. If the other side has moved, then the information about the moves is turned over to the Referee to determine and display the outcome. Now the doMove( ) is really nothing more than a call to the server-side script. It passes the move to the server and does no more. Proxy move The onProxyMove( ) method is the mirror image of the localMove( ). Because the method is fired no matter which player moves, the algorithm in the method first filters out the local move by splitting the string returned from the server into a move and a player name. It looks at the player name, and if it’s the local’s name, it ignores it and the move associated with it. (The move is handled by the localMove( ) method.) However, once the filtering has been completed, the algorithm is essentially the same as the local move operation. It does display the fact that the opponent has moved by displaying the name of the player but not the move. In this way, the application maintains the simultaneous nature of the play. Referee object The end game conditions are delegated to the Referee object. In this case, the Referee object is the RPS subclass contained within the takeTurn( ) method. By passing the moves, output text field, and name of the array used to keep track of who took a turn to the RPS object’s moveComplete( ) template method, everything can be neatly wrapped up. The single line, rps.moveComplete(p1move,p2move,playerText,monitor); takes advantage of the template method in the Referee class and launches the operations that make up the template method—doWinner( ), displayResults( ), and resetGame( ). 492 | Chapter 13: Symmetric Proxy 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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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
Page 462 and 463: Example 12-10. CharCodeLeafView.as
Page 464 and 465: Key OOP Concepts in the MVC Pattern
Page 466 and 467: Example 12-12. IModel.as (Model int
Page 468 and 469: Example 12-15. Controller.as (Contr
Page 470 and 471: Example 12-16. CBView.as 24 update(
Page 472 and 473: Note that only the combo boxview th
Page 474 and 475: Example 12-18. INewModel.as (contin
Page 476 and 477: Example 12-21. RBView.as package {
Page 478 and 479: add map type select radio button gr
Page 480 and 481: Example 12-23. CarModel.as (continu
Page 482 and 483: Example 12-25. RHController.as (con
Page 484 and 485: Example 12-28. Main.as (document cl
Page 486 and 487: Example 12-30. GPSView.as package {
Page 488 and 489: Example 12-32. ChaseController.as (
Page 490 and 491: Chapter 13 CHAPTER 13 Symmetric Pro
Page 492 and 493: • Indicate that a remote player h
Page 494 and 495: Even though both of the solutions a
Page 496 and 497: Referee 1 Player1 Proxy2 Internet S
Page 498 and 499: With a single template method, and
Page 500 and 501: developed with an eye to the order
Page 502 and 503: Boolean variables to false. (The fa
Page 504 and 505: Example 13-3. RPS.as (continued) }
Page 506 and 507: Example 13-4. proxygame.asc (contin
Page 508 and 509: Example 13-5. SymPlayer1.as package
Page 510 and 511: Example 13-5. SymPlayer1.as (contin
Page 514 and 515: In addition to using the Referee to
Page 516 and 517: Example 13-6. DynamicText.as (conti
Page 518 and 519: 3. Click the Text layer to select i
Page 520 and 521: A abstract classes, 28, 31, 68, 130
Page 522 and 523: increment and decrement commands, 2
Page 524 and 525: 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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