Geek Answers Handbook

Creating dynamic read properties in AS3

I have a class that is currently pretty dirty / repeating:

public class AvFramework extends Object
{
    // vars
    private var _handler:AvHandler;
    private var _keyboard:AvKeyboard;
    private var _manager:AvManager;

    /**
     * Constructor
     */
    public function AvFramework()
    {
        _handler = new AvHandler();
        _keyboard = new AvKeyboard();
        _manager = new AvManager();

        // attach
        _handler.framework = this;
        _keyboard.framework = this;
        _manager.framework = this;
    }

    /**
     * Getters
     */
    public function get keyboard():AvKeyboard{ return _keyboard; }
    public function get manager():AvManager{ return _manager; }
}

This class will have to use more and more classes, and I really don't want to have 3 huge lists for this, as mentioned above.

Is there a way to do this dynamically - perhaps using getDefinitonByName()a line loop to represent the classes I want to create.

I also want the properties to be read-only and accessible through framework.myDynamicVarHere.

I think something like that:

  • I am creating a list of classes in which I want to instantiate, paired with the name of the variable they should be accessing.
  • I need to make a class dynamicso that I can install vars viathis["var"] = new Blah();

A quick snippet of where my thoughts go:

var required:Object =
{
    keyboard: "avian.framework.background.AvKeyboard",
    manager: "avian.framework.background.AvManager",
    handler: "avian.framework.background.AvHandler"
};

var i:String;
for(i in required)
{
    var Req:Class = Class(getDefinitionByName(required[i]));

    this[i] = new Req();
    AvFrameworkObject(this[i]).framework = this;
}

, .

+5
2

Proxy get/set call Eugeny89. http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/utils/Proxy.html http://blog.joa-ebert.com/2007/05/25/as3-proxy-example/

var required:Object =
{
    keyboard: "avian.framework.background.AvKeyboard",
    manager: "avian.framework.background.AvManager",
    handler: "avian.framework.background.AvHandler"
};
...

import flash.utils.Proxy;
import flash.utils.flash_proxy;
public dynamic class AvFramework extends Proxy { 
    private var holder: Object = {};

    public function AvFramework() {
        var i:String;
        for(i in required)
        {
            var Req:Class = Class(getDefinitionByName(required[i]));
            var name = //get Class name from required[i] e.g. AvKeyboard from avian.framework.background.AvKeyboard
            holder[name] = new Req();
            holder[name].framework = this;
        }
    }

    flash_proxy override function getProperty( name: * ): *
    {
        return holder[name];
    }

    flash_proxy function setProperty(name:*, value:*):void
    {
        // Do nothing
    }
}

, myAvFrameworkObj.something, getProperty() , "name".

+4

, classws :

var required:Object =
{
    keyboard: "avian.framework.background.AvKeyboard",
    manager: "avian.framework.background.AvManager",
    handler: "avian.framework.background.AvHandler"
};
...

public class AvFramework extends Object { 
    private var holder: Object;

    public function AvFramework() {
        holder = new Object();

        var i:String;
        for(i in required)
        {
            var Req:Class = Class(getDefinitionByName(required[i]));
            var name = //get Class name from required[i] e.g. AvKeyboard from avian.framework.background.AvKeyboard
            holder[name] = new Req();
            holder[name].framework = this;
        }
    }

    public var getHolder() { return holder; }
}

, , AvKeyboard framework.getHolder()["AvKeyboard"] framework.getHolder()[someVar]. , required , holder .

, !

+1

More articles:


All Articles