Hi All,
>>> don't need that in
2.0 because we have closures which means that the function will maintain
the correct "this" pointer <<<
Sorry for perhaps silly questions... It sounds like AS3 Function object now
becomes something like thunks in C++, delegates in .NET or mx.utils.Delegate
in Flex1.5/AS2, so two things now are not very clear as for me:
1) Why do we need the first parameter in Function.call/Function.apply APIs
also known as "thisObject"? Code prototype used in my tests listed below. I
was not able to call A.f1 function using B class context, (thisObject
argument was ignored). Is it possible at all?
<code_snip>
class A { function f1() { trace("this="+this); } }
class B { function f1() { trace("this="+this); } }
...
var a:A = new A();
var b:B = new B();
var fa:Function = a.f1;
var fb:Function = b.f1;
fa(); // -> this=[object A]
fb(); // -> this=[object B]
fa.apply(b); // -> this=[object A] why ???
fa.call(b); // -> this=[object A] why ???
</code_snip>
2) If all functions are "thunked" in AS3, is it possible to retrieve "this"
object pointer from Function object using ActionScript code? In other words
how to find object pointer this function is belong to?
--
Thanks,
Vadim.
----- Original Message -----
From: Matt Chotin
To: flexcoders@yahoogroups.com
Sent: Wednesday, February 22, 2006 7:23 AM
Subject: RE: [flexcoders] Delegation and Callbacks
Sorry, I'm not sure I get what you're trying to do. When you say
delegate do you mean the 1.5 mx.utils.Delegate? We don't need that in
2.0 because we have closures which means that the function will maintain
the correct "this" pointer. Or are you looking for a different delegate
class?
-----Original Message-----
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of mvbaffa
Sent: Monday, February 20, 2006 4:59 AM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Delegation and Callbacks
Hi everybody,
I have developed an ActionScript class to help synchonize WebService
calls.
You have to create an instance of it in the load event of the
WebService. Then the class initializes some internal data structures
looping through the webservice operations and drives the result
event.
At the initialization process the class receives also a
setupCallback function parameter so that the application can define
methods to be called before the webservice operation is sent and
after the result event is fired. This setupCallback function is
called by the class when it is initializing.
I Would rather use a delegate to communicate with the application.
How can I define and use delegation in Flex 2/ActionScript 3
Thanks in advance
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