[webkit-dev] Constructors for DOM4 Events

[Maciej Stachowiak]

Since TPAC is less than a month away, I don't understand why we can't wait for that discussion. I do support the idea in general, and I plan to be at TPAC and will advocate for it.

I understand that sometimes we need to move ahead of the spec. If there's a reason not to wait a few extra weeks in this case, then please at least use a prefix.

Cheers,
Maciej

On Sep 30, 2012, at 6:32 PM, Kentaro Hara <haraken at chromium.org> wrote:

> TL;DR: Would it be OK to implement constructors for DOM4 Events in
> WebKit without waiting for the spec?
> 
> 
> == Background ==
> 
> Events should have constructors. 'new XXXEvent()' is much easier than
> 'e = document.createEvent(...); e.initXXXEvent(_a_lot_of_arguments_)'.
> We have already implemented constructors for a bunch of Events such as
> Event, CustomEvent, ProgressEvent, etc [5]. However, we have not yet
> implemented constructors for DOM4 Events (i.e. UIEvent, MouseEvent,
> KeyboardEvent, WheelEvent, TextEvent, CompositionEvent) because they
> are not yet speced.
> 
> Recently PointerEvent was speced with [Constructor] [2]. Considering
> that PointerEvent inherits MouseEvent, now we want to support
> [Constructor] on MouseEvent
> too. In terms of implementation, it is possible to implement
> [Constructor] on PointerEvent without implementing [Constructor] on
> MouseEvent. However, implementing [Constructor] on both PointerEvent
> and MouseEvent would be best.
> 
> == Rationale for implementing constructors for DOM4 Events ==
> 
> I have been discussing this topic for one year, in www-dom@ [4] and a
> www.w3.org bug [3]. It looks like there is a consensus on introducing
> constructors for DOM4 Events. However, the spec is still a draft [1]
> and the www.w3.org bug [3] is marked as LATER. Last week I discussed
> the timeline of the spec with Jacob Rossi (a.k.a. a spec author of
> PointerEvent and DOM4 Events). According to him:
> 
> - Their primary focus is on finishing DOM3 Events first.
> - With DOM3 Events in Candidate Recommendation, they are going to
> start working on the DOM4 Events. They will discuss it in TPAC.
> - They will introduce constructors to DOM4 Events.
> 
> In summary, constructors for DOM4 Events are going to be speced, but
> it will take time. So I would like to implement them in WebKit a bit
> ahead of the spec (and thus implement PointerEvent constructors too).
> If you have any concern, please let me know.
> 
> 
> == References ==
> [1] The spec draft by Jacob Rossi:
> http://html5labs.interoperabilitybridges.com/dom4events/
> 
> [2] The spec of Pointer Events:
> http://www.w3.org/Submission/pointer-events/
> 
> [3] www.w3.org bug:
> https://www.w3.org/Bugs/Public/show_bug.cgi?id=14051
> 
> [4] Discussion on www-dom@:
> http://lists.w3.org/Archives/Public/www-dom/2011OctDec/0081.html
> http://lists.w3.org/Archives/Public/www-dom/2012JanMar/0025.html
> 
> [5] WebKit bug:
> https://bugs.webkit.org/show_bug.cgi?id=67824
> 
> 
> -- 
> Kentaro Hara, Tokyo, Japan (http://haraken.info)
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