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

More documents

Recommendations

Info

Figure 9-5. Video and tune player application Hooking It Up Controlling subclass extensions is one use for the Template Method. In discussing applicability, the originators of the design pattern concepts (GoF) include what they call a “hook” operation. The hook operation is placed into the template method to allow extensions to the hook in the main algorithm. For ActionScript 3.0 programmers, hook functions look exactly like the abstract functions. That’s because ActionScript 3.0 has no real abstract functions, so we have to keep in mind that the difference between hook operations and abstract ones is that hook operations can be overridden, while abstraction operations must be overridden. This is where comment lines come in handy, as the following script shows: //Abstract function function doAbstract( ):void {} //Hook function function doHook( ):void {} Neither the abstract function nor the hook function has to have any content. However, each is set up differently, and adding content to the hook operation provides a way of setting up default conditions. Hooking It Up | 351
When to Hook? The hook’s useful when only part of your algorithm needs to have detailed adjustments made some of the time by the subclasses. Because the subclasses are expected to provide detail to a template method’s algorithm, you don’t need the hook as often as you might expect. A hook is a concrete method, but it can still be overridden just like any abstract method; so it’s not a matter of being written in concrete. Given that ActionScript 3.0 doesn’t differentiate between abstract and concrete functions, the difference is even more blurred. One way to approach the use of a hook in a template method is to consider exceptions in an algorithm. For example, if 9 out of 10 times your subclasses will not override the hook operation, it’s probably a good idea to use the hook. The less a hook will be overridden, the more useful it is. This may seem like a contradiction, but consider that hooks are put into the algorithm because they don’t have to be overridden. Most of the time, the subclasses can just implement the template method and be done with it, using the default value provided by your hook. However, when the subclass needs to use the hook to provide an exception to a default value, then it becomes useful. The Hook as a Lonely Repairman For years the Maytag Company depicted their repairmen as idle and lonely. The message was that Maytag products were so well manufactured that the repairmen’s services were unnecessary. We can look at the hook in the template method in the same light—lonely repairmen who are seldom required. The hook’s use is an exception; so we need to consider a scenario where conditions are usually the same but occasionally change, where we need the hook. One of the great flying areas can be found along the desert border area in Southern California. The weather is typically clear with almost unlimited visibility, allowing pilots to fly under Visual Flight Rules (VFR). Flying down to Baja, Mexico is a beautiful trip, especially along the Sea of Cortez on the eastern side of the Baja peninsula. Consider a pilot who flies tourists down to Punta Bufeo in Baja to visit the sea lion rookery. With just a few exceptions, the pilot can file a VFR flight plan and take off every day. However, every now and then, the weather conditions are less than VFR conditions—cloudy, foggy or extremely hazy. Because the pilot is rated only for VFR conditions, he can’t fly under non-VFR or Instrument Flight Conditions (IFR). Using the hook, we’ll create a template method to deal with these the situation. Baja Flight with a Hook Using our hypothetical Baja pilot, this next application shows how to employ a hook operation in a Template Method design pattern. We’re assuming that the pilot flies out of the Calexico airport where the weather’s usually sunny and clear. Open four 352 | Chapter 9: Template Method Pattern
Page 2 and 3:
ActionScript 3.0 Design Patterns
Page 4 and 5:
ActionScript 3.0 Design Patterns Wi
Page 6:
Bill would like to dedicate this to
Page 9 and 10:
Example: Sprite Factory 84 Example:
Page 11 and 12:
Video Player Concrete State Applica
Page 13 and 14:
Who This Book Is For We wanted to d
Page 15 and 16:
What You Need to Use This Book You
Page 17 and 18:
and OOP. (Working out how to conver
Page 19 and 20:
Safari® Enabled When you see a Saf
Page 21 and 22:
Editors Our development editor, Rob
Page 23 and 24:
Design patterns provide object-orie
Page 25 and 26:
that program. Like pulling a string
Page 27 and 28:
Built-in State Machines: while most
Page 29 and 30:
Figure 1-2. Rocket drawing Center p
Page 31 and 32:
Example 1-1. TestRocket.as package
Page 33 and 34:
skills that would provide the concr
Page 35 and 36:
Example 1-3. PlayVideoAbstract.as (
Page 37 and 38:
Hiding Your Data from Bad Consequen
Page 39 and 40:
Example 1-7. Encap.as (continued) }
Page 41 and 42:
Wait! There’s more! Later in this
Page 43 and 44:
As you can see in Example 1-9, the
Page 45 and 46:
Using Encapsulation and Design Patt
Page 47 and 48:
Example 1-13. QuadPets.as (continue
Page 49 and 50:
Using Interfaces and Abstract Class
Page 51 and 52:
interface. You’ll need an MP3 fil
Page 53 and 54:
Example 1-22. Subclass.as package {
Page 55 and 56:
Example 1-25. ImplementSubChange.as
Page 57 and 58:
Example 1-29. Country.as (continued
Page 59 and 60:
Example 1-32. IBiz.as package { pub
Page 61 and 62:
Example 1-35 has further difference
Page 63 and 64:
In addition to messages in the Outp
Page 65 and 66:
state here is a bit more contextual
Page 67 and 68:
your client dependency leads to une
Page 69 and 70:
Example 1-40. VidPlayer.as (continu
Page 71 and 72:
Doing Composition To understand com
Page 73 and 74:
The clearest way we’ve seen compo
Page 75 and 76:
Example 1-47. Mp3.as (continued) }
Page 77 and 78:
Example 1-54. TestMedia.as (continu
Page 79 and 80:
and ActionScript 3.0. However, the
Page 81 and 82:
Figure 1-10 shows some possible fut
Page 83 and 84:
introduction to OOP, you will find
Page 85 and 86:
Creational Patterns Conceal creatio
Page 87 and 88:
or dependency between the Client an
Page 89 and 90:
The primary responsibility of the f
Page 91 and 92:
The example package contains the Pr
Page 93 and 94:
Example 2-5. CreatorA.as (continued
Page 95 and 96:
instantiate concrete products var p
Page 97 and 98:
Example 2-8. IPrintjob.as package p
Page 99 and 100:
Clients Note that the client doesn
Page 101 and 102:
Extended Example: Color Printing Th
Page 103 and 104:
Example 2-19. NewLowVolPrintCenter.
Page 105 and 106:
Key OOP Concepts Used in the Factor
Page 107 and 108:
to implement default behavior commo
Page 109 and 110:
Example 2-26. ShapeCreator.as packa
Page 111 and 112:
draw filled shapes filledShapeCreat
Page 113 and 114:
checking if the projectile has gone
Page 115 and 116:
Example 2-32. AlienMine.as (continu
Page 117 and 118:
Example 2-34. AlienShip.as } } } }
Page 119 and 120:
Example 2-36. Weapon.as (continued)
Page 121 and 122:
Concrete Creator Classes Until we e
Page 123 and 124:
in teamwork, the Singleton can be u
Page 125 and 126:
To create a class, we need a public
Page 127 and 128:
Example 3-4. Singleton.as package {
Page 129 and 130:
Figure 3-3. Compiler not finding cl
Page 131 and 132:
However, does that mean that only a
Page 133 and 134:
Figure 3-5. Two instance labels and
Page 135 and 136:
Example 3-10. Alert.as } } { Alert.
Page 137 and 138:
However, had we done that, we would
Page 139 and 140:
for playing the selected tune. If i
Page 141 and 142:
MP3 file in the same folder, and re
Page 143 and 144:
shipping costs. It constitutes a go
Page 145 and 146:
open the Convert to Symbol dialog b
Page 148 and 149:
PART III III.Structural Patterns Tr
Page 150 and 151:
Chapter 4 CHAPTER 4 Decorator Patte
Page 152 and 153:
like abstract classes, simply by no
Page 154 and 155:
simple inheritance. Depending on ho
Page 156 and 157:
Minimalist Abstract Decorator To ge
Page 158 and 159:
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
Page 174 and 175:
} override public function evil( ):
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
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
Page 214 and 215:
Note that the new interface turns t
Page 216 and 217:
var listField = new TextField( ); l
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
Page 226 and 227:
objects and composite objects the s
Page 228 and 229:
the components. We can think of tou
Page 230 and 231:
method by tracing sName. When opera
Page 232 and 233:
oot composite 1 leaf 1 leaf 2 compo
Page 234 and 235:
Executing the following statements
Page 236 and 237:
Example 6-6. The safeRemove( ) meth
Page 238 and 239:
leaf 2 Composite 1 leaf 2 leaf 3 Di
Page 240 and 241:
Example 6-9. Playlist.as (continued
Page 242 and 243:
Example 6-10. Song.as 58 soundChann
Page 244 and 245:
Using Inverse Kinematics Inverse ki
Page 246 and 247:
Example 6-12. Composite.as package
Page 248 and 249:
Example 6-14. Main.as 23 addChild(s
Page 250 and 251:
The following steps relate to Figur
Page 252 and 253:
Example 6-16. Tail.as package { imp
Page 254 and 255:
Note how the snake is constructed u
Page 256 and 257:
Example 6-18 shows the IPlane inter
Page 258 and 259:
Unlike the Shape class, Sprite does
Page 260 and 261:
Figure 6-9. Hierarchical tree struc
Page 262 and 263:
Modifying Components to Reflect Dam
Page 264:
private function showDamage(evt:Eve
Page 267 and 268:
Behavioral Patterns Class Communica
Page 269 and 270:
Notice the tight coupling between t
Page 271 and 272:
Each envelope encapsulates a partic
Page 273 and 274:
instance is passed to the construct
Page 275 and 276:
Setting a Trigger to Invoke the Com
Page 277 and 278:
Example 7-7. IMacroCommand.as packa
Page 279 and 280:
Example 7-12. ConcreteMacroCommand.
Page 281 and 282:
Example 7-14. TextButton.as package
Page 283 and 284:
Example 7-15. InvokerPanel.as (cont
Page 285 and 286:
Extended Example: Sharing Command O
Page 287 and 288:
changes are seamlessly spread throu
Page 289 and 290:
Example 7-21. IncrementCommandWithU
Page 291 and 292:
Example 7-24. Client code for undoa
Page 293 and 294:
Example 7-26. TextDisplayField.as (
Page 295 and 296:
Example 7-28. Radio.as 44 var url =
Page 297 and 298:
Example 7-30. Client code for the p
Page 299 and 300:
Example 7-31. DynamicControlButtons
Page 301 and 302:
adio, very much like someone progra
Page 303 and 304:
Chapter CHAPTER 8 8 Observer Patter
Page 305 and 306:
introduced, adding a class as part
Page 307 and 308:
of an abstract class or an interfac
Page 309 and 310:
works fine. What’s more, using th
Page 311 and 312:
this all work right is the use of a
Page 313 and 314:
Example 8-7. ConcreteSubject.as (co
Page 315 and 316:
Example 8-9. TestSub.as (continued)
Page 317 and 318:
} this.news=news; this.sports=sport
Page 319 and 320:
Example 8-12. ConcreteSubject.as pa
Page 321 and 322: Example 8-13. ConcreteObserver.as (
Page 323 and 324: Whoaa!, the stock market is at 2987
Page 325 and 326: Example 8-17. ConcreteSubject.as pa
Page 327 and 328: Launching the Space Battle In Examp
Page 329 and 330: 5. In the Symbol editing mode, drag
Page 331 and 332: Figure 8-5. Android shooting a beam
Page 333 and 334: Example 8-19. ChangeHandler.as (con
Page 339 and 340: To make the task more manageable an
Page 341 and 342: Example 8-24. ConcreteObserver.as p
Page 343 and 344: In this application, all you’re r
Page 345 and 346: Example 8-26. QuarterBar.as (contin
Page 347 and 348: Example 8-27. QuarterGraph.as (cont
Page 349 and 350: Example 8-28. DataDesign.as (contin
Page 351 and 352: Summary The real test for a design
Page 353 and 354: to inspect. So, you’re going to n
Page 355 and 356: method. The child classes just give
Page 357 and 358: Further, discussing favoring compos
Page 359 and 360: Figure 9-3. Hollywood principle Min
Page 361 and 362: tions in the main algorithm that yo
Page 363 and 364: Example 9-4. ShedMaker.as package {
Page 365 and 366: Both instances employ the templateM
Page 367 and 368: Not-So-Concrete Concrete Classes Th
Page 369 and 370: Example 9-11. PlayVideo.as (continu
Page 371: Example 9-13. PlayMedia .as (contin
Page 375 and 376: Example 9-15. FlightPlan.as (contin
Page 377 and 378: Open a new Flash document, and type
Page 379 and 380: One application where the state pat
Page 381 and 382: tive Simulation by Jonathan Kaye an
Page 383 and 384: For example, with a two-state machi
Page 385 and 386: Example 10-2. VideoWorks.as (contin
Page 387 and 388: To complete the state machine, we n
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
Page 405 and 406: Figure 10-7. Statechart with five s
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
Page 419 and 420: Chapter CHAPTER 11 11 Strategy Patt
Page 421 and 422: say that the Context class (aggrega
Page 423 and 424:
etween the context classes and the
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 and 436:
Simply by adding setters to the con
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 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
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
Page 508 and 509:
Example 13-5. SymPlayer1.as package
Page 510 and 511:
Example 13-5. SymPlayer1.as (contin
Page 512 and 513:
Example 13-5. SymPlayer1.as (contin
Page 514 and 515:
In addition to using the Referee to
Page 516 and 517:
Example 13-6. DynamicText.as (conti
Page 518 and 519:
3. Click the Text layer to select i
Page 520 and 521:
A abstract classes, 28, 31, 68, 130
Page 522 and 523:
increment and decrement commands, 2
Page 524 and 525:
E ECOOP, 470 EmailCheck.as, 418 enc
Page 526 and 527:
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
show all

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

Create successful ePaper yourself

Delete template?

Save as template?