ActionScript for Flash MX: The Definitive Guide, Second Edition

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Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.

MovieClip Sub-Subclasses

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/*

* Instance Methods

*/

/*

* Method: SomeClass.someMethod( )

* Desc: Short description

*

* Params:

* param -Short description

*

*/

SomeClass.prototype.someMethod = function (param) {

trace("someMethod invoked with parameter of: " + param);

};

#endinitclip

The following code shows example usage of the SomeClass template. To see a manu-

ally created SomeClass instance, download the componentTemplate.fla file from the

Code Depot.

// Create an instance

var initObj = new Object( );

initObj.cp_param1 = 15;

initObj.cp_param2 = "Hello world";

this.attachMovie("someClassSymbol", "someClassInstance", 1, initObj);

MovieClip Sub-Subclasses

Just like a regular class, a MovieClip subclass can itself be extended by another sub-

class. When a parent class is defined outside of its corresponding movie clip symbol

(as in the very first Ball example in this chapter), its child subclass can be defined by:

• Setting the child’s prototype to a new parent instance

• Registering the child class with its symbol via Object.registerClass()

Remember also to invoke the parent’s constructor function from the child construc-

tor. For example, the following code shows how to create a subclass, Baseball, of our

existing class, Ball:

// Baseball class constructor

org.moock.Baseball = function ( ...