在AS3中动态创建多个只读属性

时间:2011-06-03 03:36:00

标签: flash actionscript-3 private dynamically-generated

我有一个班级,目前非常混乱/重复:

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; }
}

这个类只需要使用越来越多的类,我真的不想像上面那样拥有3个巨大的列表。

有没有办法动态地执行上述操作 - 可能在字符串循环中使用getDefinitonByName()来表示我想要创建的类。

我还希望这些属性是只读的,并且可以通过framework.myDynamicVarHere访问。

我正在思考这些问题:

  1. 我创建了一个我想要创建实例的类的列表,并与应该访问它们的变量名配对。
  2. 我需要制作课程dynamic,以便我可以通过this["var"] = new Blah();
  3. 设置变量

    我的想法的快速摘要:

    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;
    }
    

    我不确定如何才能使这些只读。

2 个答案:

答案 0 :(得分:4)

您可以使用Proxy类来控制get / set调用并完成Eugeny89的答案。 查看http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/utils/Proxy.htmlhttp://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
    }
}

使用此代码,当您执行myAvFrameworkObj.something时,getProperty()将自动调用,并从“name”变量获取属性名称。

答案 1 :(得分:1)

也许你会尝试在对象中包装那长长的classws列表:

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; }
}

你可以参考例如AvKeyboard framework.getHolder()["AvKeyboard"]framework.getHolder()[someVar] required。因此holder中的所有类都是只读的,因为{{1}}是只读的。

希望能帮到你!