RE: [Flashcoders] How to utilize this code: public static const: Needhelp understanding...

[Merrill, Jason]

>> but if I'm not mistaken, those were used in the AS2 days to attach a class 
>> to a MovieClip 

Not necessarily in this case though. In AS3 you can use things like 
getDefinitionByName() or getQualifiedClassName() to dynamically reference or 
dynamically instantiate an instance of a class.  Since this is AS3 code, the 
use would not be related to AS2.  It could be used like that with dynamic class 
referencing, or they may just be doing it as available metadata for some odd 
reason. 

An example of how I have used dynamically generated class instances is if I 
have some external XML that describes an application or solution of some kind, 
and I want to have the XML describewhat objects (and therefore what classes) 
are created, at runtime in the Flash player. For example:

var aCoolSpriteClass:Class = getDefinitionByName("aCoolSprite") as Class;
var obj:DisplayObject = new aCoolSpriteClass() as DisplayObject;

> Note: Among other things, I changed var to const; I assume "const" was
> a better pick... No?

Yes, those would be constants, so I would declare them as const so they cannot 
be modified.  Constants do never change in value at runtime. 

 Jason Merrill
 Instructional Technology Architect
 Bank of America  Global Learning 


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Re: [Flashcoders] How to utilize this code: public static const: Needhelp understanding...

[Peter Ginneberge]

I don't remember all the details, but if I'm not mistaken, those were used in the AS2 days to attach a class to a MovieClip, without 
them being linked in the Library (through the Symbol properties).


Google: Object.registerClass and/or __packages

Muzak


- Original Message - 
From: "Micky Hulse" 

To: "Flash Coders List" 
Sent: Wednesday, January 12, 2011 10:08 AM
Subject: [Flashcoders] How to utilize this code: public static const: Needhelp 
understanding...



Hello,

Surfing around the net, I found this class:



The code I would like some help with:



public class MyClass {

// Public static constants:
public static const CLASS_REF = com.foo.util.MyClass;
public static const CLASS_NAME:String = 'MyClass';
public static const LINKAGE_ID:String = 'com.foo.util.MyClass';



Note: Among other things, I changed var to const; I assume "const" was
a better pick... No?

So, I understand that a public static const can be accessed from
another class without class initialization, but I don't understand how
the above code could be helpful (other than for meta/documentation
purposes?).

Could someone post an example that shows how/why/when the above
constants could (or, can) be used in the workflow of a project/app?

I hope my question makes sense...

Thanks!
Micky


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