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

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implementations in the MVC. Our view elements are going to get more complexas they can implement a third pattern, the composite (see Chapter 6 for examples of the composite pattern). Implementing views as elements of a composite pattern only makes sense for complexnested user interfaces that contain multiple views. Nested views bring several advantages to updating the user interface, as updates can cascade down the composite view tree structure. Also, composite views can create and remove child views based on application state and user mode. A good example of a complexuser interface is the Properties inspector panel in the Flash authoring environment. The Properties inspector is context sensitive, and adds or removes user interface elements based on the object selected on the stage. Component and composite views The first step is to create the component and composite classes for the view. These classes should behave as abstract classes and should be subclassed and not instantiated, as shown in Example 12-7. Example 12-7. ComponentView.as package { import flash.errors.IllegalOperationError; import flash.events.Event; import flash.display.Sprite; // ABSTRACT Class (should be subclassed and not instantiated) public class ComponentView extends Sprite { { protected var model:Object; protected var controller:Object; public function ComponentView(aModel:Object, aController:Object = null) { } this.model = aModel; this.controller = aController; public function add(c:ComponentView):void { throw new IllegalOperationError("add operation not supported"); } public function remove(c:ComponentView):void { throw new IllegalOperationError("remove operation not supported"); } public function getChild(n:int):ComponentView { throw new IllegalOperationError("getChild operation not supported"); Minimalist Example of an MVC Pattern | 437
Example 12-7. ComponentView.as (continued) } } } return null; // ABSTRACT Method (must be overridden in a subclass) public function update(event:Event = null):void {} The ComponentView class shown in Example 12-7 defines the abstract interface for component views. This is similar to the classic component class introduced in Chapter 6, with a few key differences. The ComponentView class keeps references to the model and view, and includes a constructor. Not all views handle user input, and a component view can be constructed by just passing a model instance. Therefore, the aController parameter has a default value of null in the constructor. Also note that the ComponentView class extends the Sprite class. This makes sense as most views draw a user interface on the stage. We can use the properties and methods implemented in the built-in Sprite class to draw and add objects to the display list. The update( ) method should behave as an abstract method. Leaf views that subclass ComponentView must override and implement the update( ) method to update their user interface. This method is the listener function that intercepts update notifications from the model. For this reason, a parameter of type Event is passed to it. This parameter also has a default value of null, allowing update( ) to be called without passing an event parameter. This is useful when initially drawing the user interface in its default state, and our subsequent examples illustrate it. The CompositeView class extends ComponentView and overrides the methods that deal with handing child views. In Example 12-8, we will implement only the add( ) method for simplicity. Example 12-8. CompositeView.as package { import flash.events.Event; // ABSTRACT Class (should be subclassed and not instantiated) public class CompositeView extends ComponentView { private var aChildren:Array; public function CompositeView(aModel:Object,aController:Object = null) { super(aModel, aController); this.aChildren = new Array( ); } override public function add(c:ComponentView):void { 438 | Chapter 12: Model-View-Controller 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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Page 409 and 410: Example 10-24. RecordState.as 1 pac
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Page 413 and 414: Example 10-27. TestFMS.as (continue
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Page 425 and 426: Example 11-3. ConcreteStrategy.as p
Page 427 and 428: Adding More Concrete Strategies and
Page 429 and 430: Example 11-9. Tricks.as (continued)
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Page 433 and 434: Example 11-18. Bubbles.as package {
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Page 437 and 438: Contexts for String Strategies You
Page 439 and 440: Example 11-24. StringWork.as packag
Page 441 and 442: Example 11-29. SortAll.as package {
Page 443 and 444: Example 11-33. TestStringStrategy.a
Page 446 and 447: Using More Than One Pattern PART V
Page 448 and 449: Chapter 12 CHAPTER 12 Model-View-Co
Page 450 and 451: triggered by a user interacting wit
Page 452 and 453: grouped together in a tabbed panel
Page 454 and 455: Example 12-2. Model.as (continued)
Page 456 and 457: Example 12-5. View.as (continued) 1
Page 460 and 461: 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
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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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