By William Sanders, Chandima Cumaranatunge
The techniques during this ebook are nice for any Actionscript developer they usually completely clarify options through layout styles. i would suggest this publication to any aspiring AS3 developer.
HOWEVER, there's such a lot of terrible errors during this e-book. whereas the content material is striking, it kind of feels just like the editor was once plastered whilst he placed this little task jointly. In bankruptcy 7, it truly is virtually insufferable. phrases are passed over, code is passed over, sections are re-pasted into the booklet often... it really is completely terrible. I preserve discovering myself getting dissatisfied attempting to learn this booklet simply because loads is disregarded and loads is repeated identically at the subsequent page!!!
All in all, in case you are drawn to studying layout styles (and they're very priceless) purchase this booklet. The content material is excellent, the editor may be fired from the universe.
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Extra resources for ActionScript 3.0 design patterns: [object-oriented programming techniques]
Example 1-3. y=ypos; addChild(vid); } Abstraction | 13 Example 1-3. as (continued) } } All the values for the different elements (with the exception of null) have been abstracted to describe the object. However, like a job description that abstracts requirements, so too does the PlayVideoAbstract class. All the particulars have been placed into one long set of parameters: PlayVideoAbstract(nc:NetConnection,ns:NetStream,vid:Video,flick:String, xpos:uint,ypos:uint) The abstract parameters in the constructor function let us add any concrete elements we want, including the specific name of a video we want to play.
0 (and ECMAScript) chose not to include abstract classes in the language, as does Java. 0. All you have to do is create a regular class and treat it as an abstract class. Like interfaces, abstract classes can have abstract methods that are not directly implemented. Rather, abstract classes are subclassed and any abstract methods are overridden and implemented very much like methods are in using interfaces. However, abstract classes can have implemented methods as well; so when you need both abstract and implemented methods, abstract classes are key to such design patterns as the Factory Method (Chapter 2), Decorator (Chapter 4), and the Composite (Chapter 6), as well as others.
A more specific example would be an object that plays and stops an MP3 file. If the MP3 is playing, it’s in a play state, while if it’s not playing, it’s in a stop state. One use of state is in the context of a state machine and the State design pattern you will be seeing in Chapter 10. A state engine is a data structure made up of a state network where changes in state affect the entire application. The State design pattern is centered on an object’s behavior changing when its internal state changes.