RE: [Flashcoders] Dynamically Upcast to a class in the _global tree?
What would be the point of that? The only point of upcasting is to have
things compile with strict typing, and the compiler can't tell what the
class is if it's dynamically determined.
Are you talking about dynamic *instantiation*? Then you could use
something like this:
// Import all classes that may be needed.
import mygroup.mypackage.mysubpackage.MyClass;
// Set up variables.
var packagePath:String = "mygroup.mypackage.mysubpackage";
var className:String = "MyClass";
// Get the class' constructor function.
var classFunc:Function = getClass(packagePath, className);
// Instantiate a test object.
var test:Object = new classFunc();
// Test the instantiation; should output result of MyClass.toString().
trace(test);
/**
* Returns a class' constructor function, given the package path
* and the class' name.
*
* Classes must be imported or they will not be found.
*
* @param packagePath path of the package, e.g. [EMAIL PROTECTED]
"flash.geom"}
* @param className name of the class, e.g. [EMAIL PROTECTED]
"Point"}
* @return constructor function, or [EMAIL PROTECTED] undefined}
*/
function getClass(packagePath:String, className:String):Function {
var package:Object = getPackage(packagePath);
return package[className];
}
/**
* Returns a class package, given its path.
*
* @param packagePath path of the package, e.g. [EMAIL PROTECTED]
"flash.geom"}
* @return class package ([EMAIL PROTECTED] Object} instance), or
* [EMAIL PROTECTED] undefined}
* @see#getClass
*/
function getPackage(path:String):Object {
var package:Object = _global;
var pathArray:Array = path.split(".");
for (var i:Number = 0; i < pathArray.length; ++i) {
package = package[pathArray[i]];
}
return package;
}
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of aaron
smith
Sent: Wednesday, August 23, 2006 8:27 AM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] Dynamically Upcast to a class in the _global
tree?
no that is just the usual way of doing it.. I need to be able to
dynamically
upcast..
like: vart = new _global['somepackage']['someClass']();
something like that.. i can't remeber how to do that.. with prototypes
or
_global..
On 8/23/06, Hans Wichman <[EMAIL PROTECTED]> wrote:
>
> Hi,
> not sure if this is what you mean but:
>
> import com.somepackage.HomeView;
> var bv:BasicView = getSomeBasicView();
> var newHomeViewHomeView =HomeView( bv );
>
> grtz
> JC
>
>
> On 8/23/06, aaron smith <[EMAIL PROTECTED]> wrote:
> >
> > How do I cast to something that is in the _global tree. by that i
mean.
> > cast
> > referencing like this: _global.com.somepackage.SomeClass( var ) or
is
> the
> > _prototype chain? I can't remember...
> >
> > the situation is this, I have a BasicView class. that needs to
> dynamically
> > be upcast to other views that would potentially extend it, say a
> HomeView
> > that extends BasicView..
> >
> > say like this:
> >
> > var bv:BasicView = getSomeBasicView();
> > var newHomeView:_global.com.somepackage.HomeView =
> > _global.com.somepackage.HomeView( bv );
> >
> > I'm pretty sure it's possible, don't remember how to do it...
> >
> > thanks..
> > ___
> > Flashcoders@chattyfig.figleaf.com
> > To change your subscription options or search the archive:
> > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
> >
> > Brought to you by Fig Leaf Software
> > Premier Authorized Adobe Consulting and Training
> > http://www.figleaf.com
> > http://training.figleaf.com
> >
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> Flashcoders@chattyfig.figleaf.com
> To change your subscription options or search the archive:
> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
>
> Brought to you by Fig Leaf Software
> Premier Authorized Adobe Consulting and Training
> http://www.figleaf.com
> http://training.figleaf.com
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Re: [Flashcoders] Dynamically Upcast to a class in the _global tree?
Aaron,
What are you trying to do..?
There's no point in dynamically casting. Casting is just used to
tell the compiler that you know what you're doing.
For example:
class A
{
function doSomething(){/**/}
}
class B extends A
{
function doSomethingElse(){/**/}
}
var someObject:A=new B();
someObject.doSomethingElse(); // Wouldn't compile.
var someCastObject:B=B(someObject);
someCastObject.doSomethingElse(); // Would compile.
If you don't know what types you're dealing with 'til runtime - i.e.
you're working with dynamic types - you should never hit a situation
where you need this kind of casting.
Can you give an example of what you're trying to do..?
Ian
On 8/23/06, aaron smith <[EMAIL PROTECTED]> wrote:
no that is just the usual way of doing it.. I need to be able to dynamically
upcast..
like: vart = new _global['somepackage']['someClass']();
something like that.. i can't remeber how to do that.. with prototypes or
_global..
___
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To change your subscription options or search the archive:
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Brought to you by Fig Leaf Software
Premier Authorized Adobe Consulting and Training
http://www.figleaf.com
http://training.figleaf.com
Re: [Flashcoders] Dynamically Upcast to a class in the _global tree?
no that is just the usual way of doing it.. I need to be able to dynamically upcast.. like: vart = new _global['somepackage']['someClass'](); something like that.. i can't remeber how to do that.. with prototypes or _global.. On 8/23/06, Hans Wichman <[EMAIL PROTECTED]> wrote: Hi, not sure if this is what you mean but: import com.somepackage.HomeView; var bv:BasicView = getSomeBasicView(); var newHomeViewHomeView =HomeView( bv ); grtz JC On 8/23/06, aaron smith <[EMAIL PROTECTED]> wrote: > > How do I cast to something that is in the _global tree. by that i mean. > cast > referencing like this: _global.com.somepackage.SomeClass( var ) or is the > _prototype chain? I can't remember... > > the situation is this, I have a BasicView class. that needs to dynamically > be upcast to other views that would potentially extend it, say a HomeView > that extends BasicView.. > > say like this: > > var bv:BasicView = getSomeBasicView(); > var newHomeView:_global.com.somepackage.HomeView = > _global.com.somepackage.HomeView( bv ); > > I'm pretty sure it's possible, don't remember how to do it... > > thanks.. > ___ > Flashcoders@chattyfig.figleaf.com > To change your subscription options or search the archive: > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > > Brought to you by Fig Leaf Software > Premier Authorized Adobe Consulting and Training > http://www.figleaf.com > http://training.figleaf.com > ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] Dynamically Upcast to a class in the _global tree?
Hi, not sure if this is what you mean but: import com.somepackage.HomeView; var bv:BasicView = getSomeBasicView(); var newHomeViewHomeView =HomeView( bv ); grtz JC On 8/23/06, aaron smith <[EMAIL PROTECTED]> wrote: How do I cast to something that is in the _global tree. by that i mean. cast referencing like this: _global.com.somepackage.SomeClass( var ) or is the _prototype chain? I can't remember... the situation is this, I have a BasicView class. that needs to dynamically be upcast to other views that would potentially extend it, say a HomeView that extends BasicView.. say like this: var bv:BasicView = getSomeBasicView(); var newHomeView:_global.com.somepackage.HomeView = _global.com.somepackage.HomeView( bv ); I'm pretty sure it's possible, don't remember how to do it... thanks.. ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
