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Create a custom class 259

Create a custom class

Although ActionScript includes many classes of objects, such as the

MovieClip class and the Color class, there will be times when you need to

construct your own classes so you can create objects based on a particular

set of properties or methods.

To create a class that defines each of the new objects, you create a

constructor for a custom object class and then create new object instances

based on that new class, as in the following example:

function Product (id:Number, prodName:String, price:Number)

{

this.id = id;

this.prodName = prodName;

this.price = price;

}

To properly define a class in ActionScript 2.0, you must surround all classes

by the

class keyword, and you must declare all variables in the

constructor outside of the constructor.

class Product

{

// variable declarations

var id:Number

var prodName:String

var price:Number

// constructor

function Product (id:Number, prodName:String,

price:Number){

this.id = id;

this.prodName = prodName;

this.price = price;

}

NOTE

The following ActionScript is an example only. Do not enter the script in

your lesson FLA file.

NOTE

The following ActionScript is an example only. Do not enter the script in

your lesson FLA file.

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MACROMEDIA FLASH 8-FLASH Dokumentacja Strona 259