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

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Example 5-14. ListDisplayField.as 34 public function clear( ):void 35 { 36 aList = []; 37 this.update( ); 38 } 39 40 internal function update( ) 41 { 42 var listText:String = ""; 43 // split the array to create a string separated by returns 44 for (var i:Number = 0; i < aList.length; i++) { 45 listText += aList[i] + "\r"; 46 } 47 super.text = listText; 48 } 49 50 override public function set text(s:String):void 51 { 52 throw new Error("Cannot directly set text property - use addItem( ) method"); 53 } 54 55 override public function set htmlText(s:String):void 56 { 57 throw new Error("Cannot directly set htmlText property"); 58 } 59 60 override public function appendText(s:String):void 61 { 62 throw new Error("Cannot append text - use addItem( ) method"); 63 } 64 65 override public function replaceSelectedText(s:String):void 66 { 67 throw new Error("Cannot replace selected text"); 68 } 69 70 override public function replaceText(beginIndex:int, endIndex:int, newText:String):void 71 { 72 throw new Error("Cannot replace text"); 73 } 74 } 75 } The ListDisplayField adapter extends the TextField class, and implements the IListDisplay interface. The constructor calls the super( ) method to invoke the constructor in the superclass TextField (line 13). The implementation is straightforward in that the list of items to display is stored in an array called aList that is a property of the class. The addItem(s:String) method appends the passed string value to the end of the aList array. The deleteItemAt(i:uint) method deletes the item at the Example: List Display Adapter | 197
equested location in aList (list indexstarts at 1). This method checks to see if the delete location is within array bounds, and returns a Boolean value accordingly. Note the use of the qualifier super to set the text in the update( ) method (line 47). This allows the method to access the superclass property, listText, directly. This is necessary as the setter method for the text property is overridden (lines 50–53). In fact, several public methods in the TextField class that allow direct setting of field contents are overridden to prevent clients from breaking IListDisplay functionality. The overridden methods are: setter methods to the text and htmlText properties including appendText( ), replaceSelectedText( ), and replaceText( ). The Client Clients would use the ListDisplayField adapter class just as they would a TextField class. This is the big advantage to implementing class adapters in <strong>ActionScript</strong> <strong>3.0</strong>, as the public methods and properties of the existing class behave as expected (unless overridden). The following client, Main.as shown in Example 5-15, uses a TextFormat object to set the font and font size of the display object. In addition, the border property of the text field is set to show the field boundary. Example 5-15. Main.as (document class) package { import flash.display.MovieClip; import flash.text.*; public class Main extends MovieClip { public function Main( ) { // create ListDisplayField var shoppingListField:ListDisplayField = new ListDisplayField( ); // develop field formatting var format:TextFormat = new TextFormat( ); format.size = 18; format.font = "Arial"; // set field location and format shoppingListField.x = 20; shoppingListField.y = 20; shoppingListField.border = true; shoppingListField.defaultTextFormat = format; // create list shoppingListField.addItem("Bread"); shoppingListField.addItem("Butter"); shoppingListField.addItem("Broccoli"); shoppingListField.addItem("Cheese"); // changed mind about Broccoli 198 | Chapter 5: Adapter 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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Page 170 and 171: Adding Properties and Methods Up to
Page 172 and 173: Decorating with Multiple Properties
Page 174 and 175: } override public function evil( ):
Page 176 and 177: Example 4-25. Compassion.as package
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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
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Page 200 and 201: and their functionality to figure o
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 210 and 211: ignition key of the car (assume tha
Page 212 and 213: Example 5-11. CarAdapter.as (contin
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Page 216 and 217: var listField = new TextField( ); l
Page 220 and 221: Example 5-15. Main.as (document cla
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Page 224 and 225: Summary The adapter pattern allows
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Page 234 and 235: Executing the following statements
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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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Page 262 and 263: Modifying Components to Reflect Dam
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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
Page 528 and 529:
Q QuadPets.as, 25 R Radio.as, 273 R
Page 530:
T Tail.as, 231 Target.as, 180 Templ
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