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Resources

I will publish a list containing links to ActionScript resources as a separate document. Search for ActionScript Resources in theConnexions search box.

Complete program listings

Complete listings of the ActionScript and MXML files discussed in this lesson are provided in Listing 10 through Listing 16 below.

Listing for the file named interface01.mxml.

<?xml version="1.0" encoding="utf-8"?><!--Illustrates polymorphism using an interface.--><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"xmlns:cc="CustomClasses.*"><cc:Driver/></mx:Application>
Listing

Listing for the file named driver.as.

package CustomClasses{ import flash.events.*;import mx.containers.HBox;import mx.containers.VBox; import mx.controls.Button;import mx.controls.Label; import mx.controls.TextArea;public class Driver extends VBox{private var textArea:TextArea = new TextArea(); private var myShape:IArea;private var randomChoice:Number;private var radius:uint; private var rectWidth:uint;private var rectHeight:uint;public function Driver(){//constructor var label:Label = new Label();label.text = "Interface Polymorphism Demo"; label.setStyle("fontSize",14);label.setStyle("color",0xFFFF00); addChild(label);//Put three buttons in an HBoxvar hbox:HBox = new HBox(); addChild(hbox);var areaButton:Button = new Button();areaButton.label = "Area"; hbox.addChild(areaButton);var circButton:Button = new Button();circButton.label = "Circumference"; hbox.addChild(circButton);var volumeButton:Button = new Button();volumeButton.label = "Volume"; hbox.addChild(volumeButton);//Put the text area below the HBox.textArea.width = 245; textArea.height = 80;addChild(textArea);//Register a click event handler on each of the // buttonsareaButton.addEventListener( MouseEvent.CLICK,areaButtonHandler);circButton.addEventListener(MouseEvent.CLICK,circButtonHandler);volumeButton.addEventListener( MouseEvent.CLICK,volumeButtonHandler);}//end constructor//Local utility method for getting and saving four // random values.private function getRandomValues():void{ randomChoice = Math.random();radius = uint(10*Math.random() + 1); rectWidth = uint(10*Math.random() + 1);rectHeight = uint(10*Math.random() + 1); }//end getRandomValues//Define click event handler methods.private function areaButtonHandler( event:MouseEvent):void{getRandomValues();if(randomChoice<0.5){ myShape = new MyCircle(radius);}else{ myShape = new MyRectangle(rectWidth,rectHeight);}//end else textArea.text = myShape.id() + myShape.area();}//end areaButtonHandler private function circButtonHandler(event:MouseEvent):void{ getRandomValues();if(randomChoice<0.5){ myShape = new MyCircle(radius);}else{ myShape = new MyRectangle(rectWidth,rectHeight);}//end else textArea.text = myShape.id() +myShape.circumference(); }//end circButtonHandlerprivate function volumeButtonHandler(event:MouseEvent):void{ getRandomValues();if(randomChoice<0.5){ myShape = new MyCircle(radius);}else{ myShape = new MyRectangle(rectWidth,rectHeight);}//end else textArea.text = myShape.id() + myShape.volume();}//end circButtonHandler }//end class}//end package

Listing for the file named iarea.as.

package CustomClasses{ public interface IArea extends IVolume,ICircumference{function area():String; function id():String;}//end interface }//end package

Listing for the file named ivolume.as.

package CustomClasses{ public interface IVolume{function volume():String; }//end interface}//end package

Listing for the file named icircumference.as.

package CustomClasses{ public interface ICircumference{function circumference():String; }//end interface}//end package

Listing for the file named mycircle.as.

package CustomClasses{ public class MyCircle implements IArea{private var radius:Number;public function MyCircle(radius:Number){//constructor this.radius = radius;}//end constructorpublic function area():String{ return "Radius = " + radius + "\n" +"Area = " + Math.PI * radius * radius; }//end areapublic function id():String{return "Circle\n"; }//end idpublic function circumference():String{return "Radius = " + radius + "\n" + "Circumference = " + 2 * Math.PI * radius;}//end function circumferencepublic function volume():String{ //Assumes that the shape is a cylinder with a// depth of ten units. return "Radius = " + radius + "\n" +"Depth = 10\n" + "Volume = " + 10 * Math.PI * radius * radius;}//end area}//end class }//end package

Listing for the file named myrectangle.as.

package CustomClasses{ public class MyRectangle implements IArea{private var width:Number; private var height:Number;public function MyRectangle(width:Number,height:Number){//constructor this.width = width;this.height = height; }//end constructorpublic function area():String{ return "Width = " + width + "\n" +"Height = " + height + "\n" + "Area = " + width * height;}//end areapublic function id():String{ return "Rectangle\n";}//end idpublic function circumference():String{ return "Width = " + width + "\n" +"Height = " + height + "\n" + "Circumference = " + 2 * (width + height);}//end function circumferencepublic function volume():String{ //Assumes that the shape is a rectangular solid// with a depth of ten units. return "Width = " + width + "\n" +"Height = " + height + "\n" + "Depth = 10\n" +"Volume = " + 10 * width * height; }//end area}//end class}//end package

Miscellaneous

This section contains a variety of miscellaneous materials.

Housekeeping material
  • Module name: Interface Polymorphism - The Big Picture
  • Files:
    • ActionScript0112\ActionScript0112.htm
    • ActionScript0112\Connexions\ActionScriptXhtml0112.htm
PDF disclaimer: Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware that some of the HTML elements in this module may not translate well into PDF.

-end-

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Source:  OpenStax, Object-oriented programming (oop) with actionscript. OpenStax CNX. Jun 04, 2010 Download for free at http://cnx.org/content/col11202/1.19
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