48 | Chapter 1: Object-Oriented Programming, Design Patterns, and ActionScript 3.0
Keep in mind that a getter method, using thegetkeyword, looks like a property, and
is treated like one. Any reference todisplayObjectis actually a method request. The
trick is to add the instance to the display list, and at the same time call the method
that establishes the instance as aDisplayObject. Example 1-41 does just that.
public class VidPlayer extends Sprite implements IVid
{
private var ns:NetStream;
private var vid:Video;
private var nc:NetConnection;
public function get displayObject( ):DisplayObject
{
return this;
}
public function playVid(flv:String):void
{
nc=new NetConnection( );
nc.connect(null);
ns=new NetStream(nc);
ns.play(flv);
vid=new Video( );
vid.attachNetStream(ns);
addChild(vid);
}
}
}
Example 1-41. DoVid.as
package
{
import flash.display.Sprite;
public class DoVid extends Sprite
{
//Type as Interface
private var showTime:IVid;
public function DoVid( )
{
//Play the video
showTime=new VidPlayer( );
showTime.playVid("iVid.flv");
//Include DisplayObject instance
addChild(showTime.displayObject);
showTime.displayObject.x=100;
showTime.displayObject.y=50;
}
}
}
Example 1-40. VidPlayer.as (continued)