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Download ActionScript 3.0 design patterns by William B Sanders; Chandima Cumaranatunge PDF

By William B Sanders; Chandima Cumaranatunge

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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.

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. 0 in the Language Reference, you might also want to note what’s in the packages you import. * you can bring in everything in the display package.

Example 1-4. flv"; public function PlayAbstract( ) { var playIt:PlayVideoAbstract=new PlayVideoAbstract(conn,stream,vid, flick,100,50); addChild(playIt); } } } All the entire class does is to create a single instance of the PlayVideoAbstract class and place it on the stage. Private variables serve to provide most of the concrete values for the required parameters. Literals provide the data for both the horizontal (x) and vertical (y) positions of the video. To test it, just change the Document class name in the Flash document (FLA) file to PlayAbstract.

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