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

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With any application, you’re likely to encounter recurring algorithms. For this application, we decided to include some little algorithms that we use with different applications that have to be rebuilt every time we create an application that uses them. However, we don’t want to make them into classes where the main objective is to inherit the functionality. Rather, we want to use them in composition so that we have more flexibility, and use their functionality only where we need them. For our example, we’ve taken two simple types of string and sorting issues that seem to come up in a lot of different applications. First, we built some simple strategies for checking strings. The first strategy is designed to see if the @ symbol is placed in an email address, and if it’s not in the first or last position in a string. The second strategy is a password-checking algorithm that knocks all entries to lowercase, and then sees if they match the correct password. Our second strategy interface is for demonstrating different sorting possibilities using the Array class and sort( ) method. By changing the sort parameters, you will be able to see which constants to use with different types of sorts and see the outcomes. Figure 11-4 shows all of the connections between the classes. StringChecker stringWork EmailCheck() sortWork SimpleSort StringChecker stringWork StringWork sortWork SortWork workStrings() workSorts() setString() sortSet() Passwork stringWork PasswordVerify() sortWork SortAll() Figure 11-4. Applying the Strategy pattern EmailCheck stringer() { //implements checking for @ sign in email } ‹‹interface›› StringWork stringer() PasswordVerify stringer() { //implements check password match } SimpleSort sorter() { //implements basic array sort } ‹‹interface›› SortWork sorter() SortAll sorter() { //implements sort ignoring case } SortBack sorter() { //implements descending sort ignoring case } The code in Examples 11-21 through 11-33 makes up the ActionScript files that constitute this next application. The application also requires a single Flash document file with the Document class name TestStringStrategy. Working with String Strategies | 415
Contexts for String Strategies You can think of the context classes as the clients for the strategies. They use the different strategies. Often, you will hear that a client has-a behavior. Whenever a client class delegates to a delegate class, such as the strategy classes in Figure 11-4, it has-a behavior generated by the strategy class. In this application, the context classes represent the client classes for the strategy classes. Like all context classes, the StringChecker class in Example 11-21 sets a reference to the two strategy interfaces, StringWork and SortWork. In addition, it has functions, workStrings( ) and workSorts( ) that constitute the methods used to delegate work to the strategies. Example 11-21. StringChecker.as package { //Context class class StringChecker { protected var stringWork:StringWork; protected var sortWork:SortWork; public function StringChecker( ):void { } } } public function workStrings(s:String):String { return stringWork.stringer(s); } public function workSorts(a:Array):Array { return sortWork.sorter(a); } public function setString(sw:StringWork):void { stringWork=sw; } public function setSort(sow:SortWork):void { sortWork=sow; } In addition to having reference properties and methods, the context class includes setter operations, setString( ) and setSort( ), to dynamically set strategies to instances of the context classes. Next, in Examples 11-22 and 11-23, two concrete context classes extend the primary context class. Note that they inherit the references to the strategies, 416 | Chapter 11: Strategy 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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Page 389 and 390: Example 10-7. State.as package { //
Page 391 and 392: Example 10-10. VideoWorks.as (conti
Page 393 and 394: Example 10-13. TestVid.as package {
Page 395 and 396: Example 10-13. TestVid.as (continue
Page 397 and 398: Example 10-15. StopState.as (contin
Page 399 and 400: Example 10-17. PauseState.as 22 pub
Page 401 and 402: Example 10-19. TestPause.as (contin
Page 403 and 404: Figure 10-6 shows what your video p
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Page 407 and 408: Example 10-22. PlayState.as 1 packa
Page 409 and 410: Example 10-24. RecordState.as 1 pac
Page 411 and 412: Example 10-26. VideoWorks.as (conti
Page 413 and 414: Example 10-27. TestFMS.as (continue
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Page 421 and 422: say that the Context class (aggrega
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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)
Page 431 and 432: Even though we’ve discussed some
Page 433 and 434: Example 11-18. Bubbles.as package {
Page 435: Simply by adding setters to the con
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 458 and 459: implementations in the MVC. Our vie
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
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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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