在 ActionScript 3 中的类实例化之前运行代码

发布于 2024-08-24 01:57:36 字数 990 浏览 4 评论 0原文

我需要在类声明实例化之前运行代码。这对于在工厂中自动注册类特别有用。请参阅：

// Main.as
public class Main extends Sprite 
{
    public function Main() : void
    {
        var o : Object = Factory.make(42);
    }
}

// Factory.as
public class Factory
{
    private static var _factory : Array = new Array();

    public static function registerClass(id : uint, c : Class) : void
    {
        _factory[id] = function () : Object { return new c(); };   
    }

    public static function make(id : uint) : Object
    {
        return _factory[id]();
    }
}

// Foo.as
public class Foo
{
    // Run this code before instanciating Foo!
    Factory.registerClass(CLASS_ID, Foo);

    public static const CLASS_ID : uint = 42;
}

据我所知，ActionScript 语言的 JIT 机器不允许我这样做，因为在 Main 方法中没有引用 Foo 。正在生成 Foo 类，我无法（也不想）在 Main 中注册这些类：我想在 a 中注册所有导出的类特定的包（或库）。理想情况下，这可以通过包内省来完成，而 ActionScript 3 中不存在这种功能。

您知道我的设计问题有任何修复（或其他解决方案）吗？

原文

I need to run code in a class declaration before its instanciation. This would be especially useful to automatically register classes in a factory. See:

// Main.as
public class Main extends Sprite 
{
    public function Main() : void
    {
        var o : Object = Factory.make(42);
    }
}

// Factory.as
public class Factory
{
    private static var _factory : Array = new Array();

    public static function registerClass(id : uint, c : Class) : void
    {
        _factory[id] = function () : Object { return new c(); };   
    }

    public static function make(id : uint) : Object
    {
        return _factory[id]();
    }
}

// Foo.as
public class Foo
{
    // Run this code before instanciating Foo!
    Factory.registerClass(CLASS_ID, Foo);

    public static const CLASS_ID : uint = 42;
}

AFAIK, the JIT machine for the ActionScript language won't let me do that since no reference to Foo is made in the Main method. The Foo class being generated, I can't (and don't want to) register the classes in Main: I'd like to register all the exported classes in a specific package (or library). Ideally, this would be done through package introspection, which doesn't exist in ActionScript 3.

Do you know any fix (or other solution) to my design issue?

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来世叙缘 2024-08-31 01:57:36

我不能 100% 确定这是否是您想要的，但是您尝试过使用静态初始化程序吗？

public class Foo
{
    // Static Initializer
    {
        Factory.registerClass(CLASS_ID, Foo);
    }

    public static const CLASS_ID : uint = 42;
}

http://life.neophi.com/danielr/2006/12/static_initializers_in_as3。 html

I'm not 100% sure sure if this is what you're after, but have you tried using a Static Initializer?

public class Foo
{
    // Static Initializer
    {
        Factory.registerClass(CLASS_ID, Foo);
    }

    public static const CLASS_ID : uint = 42;
}

http://life.neophi.com/danielr/2006/12/static_initializers_in_as3.html

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