What is the correct way to use AS3 externs?

[Tiago Ling]

Hi, 

I'm using Haxe 3.0.1, targetting Flash 10.3 and trying to use a swc library with -swf-lib.

If i only add the library with "-swf-lib lib/framework.swc" it compiles, however the application does not recognize any "protected" variables, functions and properties. It returns me this error:

"[Fault] exception, information=TypeError: Error #1006: alignSite is not a function"

This happens because at runtime alignSite (in AS3 a protected function) the function simply does not exist.

I figure i could use extern classes to map this function and other properties which doesn't seem to appear at runtime and i did this: "haxe -swf nothing.swf --no-output -swf-lib framework.swc --gen-hx-classes" (just like in the haxe site).

After doing this i put the generated files in a classpath for my application to recognize. The extern classes generated also don't have the protected functions / properties, so i edited them manually to include these fields.

But when trying to compile, i receive the following error:

"[Fault] exception, information=VerifyError: Error #1053: Illegal override of onResize"

This is the original onResize function in AS3:

"protected function onResize(event:Event):void {}"

The extern class (this was added to the extern class manually and tested with private and public declarations - both resulted in the same error described above):

"function onResize(event:Event):Void;"

The haxe code which tries to override the function is this (also tried with public and private, same error):

"override function onResize(event:Event):Void {}"

I don't know if there is any step i'm missing, or if i'm doing something wrong, but it seems that using as3 classes with -swf-lib isn't a fully implemented solution yet, since protected declarations just aren't recognized both when using the library itself and when creating extern classes. 

Any help would be much appreciated,

Thanks in advance!

[Luca]

protected functions in AVM2/AS3 can only be used from the class which defines them, or from a class which extends it. Functions most likely have to be overidden with the same access restrictions or tighter, so you'd have to add @:protected to your override method which will make Haxe compile that method with AS3 protected access instead of public access.

[Tiago Ling]

Hi Luca,

Thanks for your answer, it solved my overriding problems!

But i still have the problem in which some functions and variables with protected declaration aren't being recognized at runtime (they are recognized normally at compile time, even with autocomplete from Flashdevelop). I have a haxe class which extends an as3 class from the swc. I also have an extern to this class, created from the swc.

On the child haxe class, trying to call "super.alignSite(0, 0)" yield the following runtime error:

[Fault] exception, information=ReferenceError: Error #1065: Variable alignSite is not defined.

Also, trying to just call "alignSite(0, 0)" or "this.alignSite(0, 0)" returns this error:

[Fault] exception, information=TypeError: Error #1006: alignSite is not a function

I'm declaring this function in the extern like this:

@:protected function alignSite(w:Int, h:Int):Void;

 

Any clues on why this is happening? Do i have to use any metadata in my class which extends from the one inside the swc, or are these only used in the extern? 

Thanks!

Tiago Ling Alexandre

Tel: +55 41 8819-3191

2013/10/3 Luca <delta...@hotmail.com>

protected functions in AVM2/AS3 can only be used from the class which defines them, or from a class which extends it. Functions most likely have to be overidden with the same access restrictions or tighter, so you'd have to add @:protected to your override method which will make Haxe compile that method with AS3 protected access instead of public access.

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