如何获取变量类型?并实例化它? [英] How to get type of variable? and instantiate it?

问题描述

我正在尝试创建一个函数来打开一个窗口，但要确保同一个窗口尚未打开.我希望能够将一个非实例化的 var 或一个实例化的 var 传递给它，它可以以任何一种方式工作.如果窗口已经打开，则关闭它然后重新打开它.

I am trying to make a function that opens a window but makes sure the same window is not already open. I want to be able to pass it a non-instantiated var or an instantiated var and it work either way. If the window is already open it closes it then reopens it.

所以我需要一种方法来传递一个 Window 类型的变量或一个子类(如果有)，并实例化正确的子类.

So I need a way to pass a variable of type Window or a subclass if it, and instantiate the proper subclass.

我正在寻找这样的东西:

I am looking for something like this:

public function openWindowOnce(window:Window):void
{
    if(isOpen(window))
    {
        closeIfOpen(window);
    }
    window = new Window(); /**<-- THIS LINE window can also be a sublcass of window, 
                             *    I want to instatiate the correct sublass,
                             *    I also want to make sure that it is a Window or a
                             *    Sublcass of window before I instatiate it.
                             */ 
    window.open();
}

谢谢！

推荐答案

您可以尝试组合使用 flash.utils.getDefinitionByName(), flash.utils.getQualifiedClassName() 和 ClassFactory 来实现结果.

You can try using a combination of flash.utils.getDefinitionByName(), flash.utils.getQualifiedClassName() and ClassFactory to achieve the result.

var className:string = getQualifiedClassName(object); //returns the class name    
var classObj:Class = getDefinitionByName(className) as Class; //get a Class object
var factory:IFactory = new ClassFactory(classObj);// get a Class factory    
var newObj:Object = factory.newInstance();

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