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

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ignition key of the car (assume that the car is in gear all the time). The setSteeringWheelAngle( ) public method takes in the angle of the steering wheel and rotates the car accordingly. The interface is illustrated in Figure 5-4. Ignition key Steering wheel public function start() :void Figure 5-4. The original interface of the LegacyCar class public function setSteeringWheelAngle (nAngle:int) :void The new context Let’s assume that the new context requires the car to be driven, not only by a steering wheel, but by alternative input devices as well. For example, we need to drive the car using the keyboard or the mouse. Think of the new context as an effort to modify the car to be driven by someone disabled who can’t use a steering wheel. The original interface allowed the car to be steered with very fine-grained movements using the setSteeringWheelAngle( ) method. You could make the steering wheel turn half a degree or 900 degrees (2.5 <strong>com</strong>plete rotations of the steering wheel). However, generating such a wide range of values is not possible with key presses. A key press essentially has two values, key down and key up. It is evident that we’ll have to turn the steering wheel in discrete steps. For example, we can assume that every press of the left-arrow key represents turning the steering wheel by 50 degrees counterclockwise. The right-arrow key will, in turn, represent turning the steering wheel in the clockwise direction. It will also be helpful to have a way to get the steering wheel back to its original position. The up arrow key can be used to set the steering wheel angle to zero. We need to convert the interface to fit this new context. The new interface Based on the previous analysis, the new interface needs several methods to meet the requirements of the new context. The ICar target interface, shown in Example 5-10 and depicted in Figure 5-5, is designed for the new context. Example: Car Steering Adapter | 189
Example 5-10. ICar.as package { public interface ICar { function start( ):void function turnMoreToTheLeft( ):void function turnMoreToTheRight( ):void function goStraight( ):void } } The Adapter Class Ignition key Up arrow key Left arrow key Right arrow key Figure 5-5. The interface showing keyboard input We now have a target interface. The next step is to figure out if an object or class adapter is the most suitable option. Because the existing class is small with only two public methods, we won’t get any benefits from using a class adapter. If there were methods in the existing class that could be directly used by the client in the new context, a class adapter would make sense. Therefore, the CarAdapter shown in Example 5-11 will be implemented as an object adapter. Example 5-11. CarAdapter.as package { public class CarAdapter implements ICar { private var legacyCar:LegacyCar; private var nSteeringAngle:Number; 190 | Chapter 5: Adapter Pattern function start() :void function goStraight() :void function turnMoreToTheRight() :void function turnMoreToTheLeft() :void
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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
Page 160 and 161: Example 4-5. DecConB.as package { /
Page 162 and 163: Applying a Simple Decorator Pattern
Page 164 and 165: If you want to create more concrete
Page 166 and 167: Example 4-15. Muff.as package { pub
Page 168 and 169: Figure 4-6. Paper doll with two dif
Page 170 and 171: Adding Properties and Methods Up to
Page 172 and 173: Decorating with Multiple Properties
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Page 176 and 177: Example 4-25. Compassion.as package
Page 178 and 179: Deadly sins Example 4-29. Rage.as p
Page 180 and 181: Example 4-33. Dogmatisms.as package
Page 182 and 183: class window in the Dual.fla Proper
Page 184 and 185: Example 4-37. Soul.as (continued) }
Page 186 and 187: Imagine that you are responsible fo
Page 188 and 189: Example 4-41. Accord.as (continued)
Page 190 and 191: Example 4-45. GPS.as package { publ
Page 192 and 193: Example 4-48. Deal.as 16 internal v
Page 194 and 195: Example 4-48. Deal.as 120 { 121 tra
Page 196 and 197: Figure 4-8. Decorator user interfac
Page 198 and 199: Chapter 5 CHAPTER 5 Adapter Pattern
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Page 202 and 203: Example 5-4. Main.as (continued) }
Page 204 and 205: Example 5-5. Adaptee.as package { p
Page 206 and 207: methods and properties to accomplis
Page 208 and 209: Example 5-9. LegacyCar.as 47 } 48 4
Page 212 and 213: Example 5-11. CarAdapter.as (contin
Page 214 and 215: Note that the new interface turns t
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Page 218 and 219: Example 5-14. ListDisplayField.as 3
Page 220 and 221: Example 5-15. Main.as (document cla
Page 222 and 223: Example 5-17. Main.as (document cla
Page 224 and 225: Summary The adapter pattern allows
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Page 234 and 235: Executing the following statements
Page 236 and 237: Example 6-6. The safeRemove( ) meth
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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
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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
Page 530:
T Tail.as, 231 Target.as, 180 Templ
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