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Re: Notes from our WebIDL + ES5 phone chat today...

From: Maciej Stachowiak <mjs@apple.com>
Date: Wed, 07 Oct 2009 22:56:32 -0700
Cc: Garrett Smith <dhtmlkitchen@gmail.com>, Travis Leithead <travil@microsoft.com>, Allen Wirfs-Brock <Allen.Wirfs-Brock@microsoft.com>, "Mark S. Miller" <erights@google.com>, Doug Schepers <schepers@w3.org>, "public-script-coord@w3.org" <public-script-coord@w3.org>
Message-id: <9D8C7633-F2AF-4871-B9A4-357758F71E1F@apple.com>
To: Cameron McCormack <cam@mcc.id.au>

On Oct 7, 2009, at 10:03 PM, Cameron McCormack wrote:

> Cameron McCormack:
>>> Being able to do
>>>
>>>  EventTarget.prototype.addEventListener = Ö
>>>
>>> instead of doing it on every mixin prototype object, which is how it
>>> would need to be done as currently specified.
>>>
>
> Garrett Smith:
>> I see. Why is that a problem?
>
> Itís a problem because you might not know all of the places this mixin
> has been mixed in, and even if you do, it seems like more work than
> should be necessary.

Being able to prototype hack mixins in a single place would be nice.  
But I think that currently no browser really supports that, and it  
seems like it would be tricky to implement. I suggest maybe this  
shouldn't be a feature for Web IDL 1.0, since no browser has the  
behavior, no spec using Web IDL requires it, and it can always be  
added later.

>
> Here is an instance of this being reported as a bug, btw:
>
>  https://bugzilla.mozilla.org/show_bug.cgi?id=390411

That bug seems like a slightly different issue than mixins. This is a  
matter of Gecko redefining inherited methods on derived objects. It  
seems like this could be fixed for the primary ancestor without  
requiring anything special to be done for mixins.

The way WebKit works is that we consider one inherited interface  
"primary" and delegate to its prototype, but other mixin interfaces  
are flattened into whatever inherits from it. I suggest that behavior  
is the right balance of usefulness and practicality of efficient  
implementation.

Regards,
Maciej
Received on Thursday, 8 October 2009 05:57:08 UTC

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