By William B Sanders; Chandima Cumaranatunge
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Finally, when the showTime instance is added to the display list with the addChild statement, it is added as both the child of the VidPlayer class and the DisplayObject class by using the displayObject getter. display:DisplayObject. IVid appears in the error because the instance was typed to the interface instead of the implementation. By slipping in the DisplayObject typed getter method, we avoid the error. Favor Composition Throughout this chapter, we have discussed the principle of programming to the interface instead of the implementation.
ConcreteMethod( ); } } } The following shows what appears in the Output window when you test the program: This is the overidden abstract method I'm a concrete method from an abstract class At this point you may be scratching your head wondering why you should go through this kind of convolution to do what you could do with a non-abstract class. Instead of subclassing the abstract class, overriding one of the methods, and then implementing the subclass, we could have just written both methods the way we wanted them in the first place and not have to override anything.
This means that the application requires one of the Sprite class properties that is not inherited. One byte over the line: in Example 1-9, if you substitute the MovieClip for Sprite classes for the parent class, you will find that your SWF file is larger than when you tested it with Sprite (708 bytes versus 679 bytes). The 29 byte difference probably won’t bloat your program significantly, but with added classes in design pattern applications, an unnecessary byte here and one there might add up.
ActionScript 3.0 design patterns by William B Sanders; Chandima Cumaranatunge