如何获得变量的类型？并创建实例？ [英] How to get type of variable? and instantiate it?

问题描述

我试图让，打开一个窗口，但可以确保在同一窗口尚未打开的功能。我希望能够通过它是非实例化VAR或实例化的变种，它无论采用哪种方式工作。如果窗口已经打开，它会关闭它，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.

所以我需要一个方式来传递式窗口的变量或子类，如果它和实例化适当的子类。

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

我要寻找的是这样的：

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

您可以尝试使用 flash.utils.getDefinitionByName的组合（）， flash.utils.getQualifiedClassName（）和的ClassFactory 来实现的结果。

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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