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

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Example 7-23. UndoLastCommand.as (continued) } { } override public function execute( ):void { if (aCommandHistory.length) { var lastCommand:CommandWithUndo = aCommandHistory.pop( ); lastCommand.undo( ); } } override public function undo( ):void { throw new IllegalOperationError("undo operation not supported on this command"); } Undoable Commands Assigned from the Client In Example 7-24, the client can be modified to create command objects using the concrete commands that support undo (lines 11–13). A new “Undo” button is added (line 19), and the corresponding command object is attached to it (line 27). Example 7-24. Client code for undoable number manipulator 1 // create new receiver 2 var numDisplayField:TextField = new TextField( ); 3 numDisplayField.autoSize = TextFieldAutoSize.LEFT; 4 numDisplayField.text = '100'; // default value 5 numDisplayField.border = true; 6 numDisplayField.x = 50; 7 numDisplayField.y = 50; 8 this.addChild(numDisplayField); 9 10 // create concrete commands 11 var incCommand:CommandWithUndo = new IncrementCommandWithUndo(numDisplayField); 12 var decCommand:CommandWithUndo = new DecrementCommandWithUndo(numDisplayField); 13 var undo:CommandWithUndo = new UndoLastCommand( ); 14 15 // create invoker button panel 16 var panel:InvokerPanel = new InvokerPanel( ); 17 panel.setButton(0,"+1"); 18 panel.setButton(1,"-1"); 19 panel.setButton(2,"Undo"); 20 panel.x = 50; 21 panel.y = 100; 22 this.addChild(panel); 23 24 // add commands to invoker 25 panel.setCommand(0, incCommand); Extended Example: Implementing Undo | 269
Example 7-24. Client code for undoable number manipulator 26 panel.setCommand(1, decCommand); 27 panel.setCommand(2, undo); The example application will look like Figure 7-4 with an additional “Undo” button. Command “redo” functionality including logging features can be implemented in similar ways. Logging features are useful when the commands executed need to be saved on disk. For example, saving the installation command objects on disk when a new application is installed will facilitate an uninstall by loading the logged commands and undoing them in reverse order. Example: Podcast Radio This example implements a classic car radio with a twist. Instead of programming the push buttons to tune to a radio station, they will be attached to command objects that will download and play the latest episode from a podcast. Think of this as a futuristic car radio when long-range Wi-Fi becomes a reality. You can listen to the NPR hourly news summary on demand without waiting for the top of the hour. Figure 7-5 shows the screen layout of the application. It consists of labeled buttons that indicate the genre of the podcast assigned to each button, and a text field that displays the title of the podcast item that is currently playing. Figure 7-5. Screenshot of podcast radio What Is a Podcast? A podcast is a media file that is distributed over the Internet. Podcasts are distributed using a syndication feed, which is a standard way of distributing content that is regularly updated. The feed is an XML file just like a syndicated news feed that lists news stories with the most recent one first. The difference between news feeds and 270 | Chapter 7: Command 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
Page 240 and 241: Example 6-9. Playlist.as (continued
Page 242 and 243: Example 6-10. Song.as 58 soundChann
Page 244 and 245: Using Inverse Kinematics Inverse ki
Page 246 and 247: Example 6-12. Composite.as package
Page 248 and 249: Example 6-14. Main.as 23 addChild(s
Page 250 and 251: The following steps relate to Figur
Page 252 and 253: Example 6-16. Tail.as package { imp
Page 254 and 255: Note how the snake is constructed u
Page 256 and 257: Example 6-18 shows the IPlane inter
Page 258 and 259: Unlike the Shape class, Sprite does
Page 260 and 261: Figure 6-9. Hierarchical tree struc
Page 262 and 263: Modifying Components to Reflect Dam
Page 264: private function showDamage(evt:Eve
Page 267 and 268: Behavioral Patterns Class Communica
Page 269 and 270: Notice the tight coupling between t
Page 271 and 272: Each envelope encapsulates a partic
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Page 275 and 276: Setting a Trigger to Invoke the Com
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: Example 7-21. IncrementCommandWithU
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)
Page 317 and 318: } this.news=news; this.sports=sport
Page 319 and 320: Example 8-12. ConcreteSubject.as pa
Page 321 and 322: Example 8-13. ConcreteObserver.as (
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Page 325 and 326: Example 8-17. ConcreteSubject.as pa
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Page 333 and 334: Example 8-19. ChangeHandler.as (con
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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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