- From: Ian Hickson <ian@hixie.ch>
- Date: Wed, 17 Jul 2013 21:08:35 +0000 (UTC)
- To: Justin Novosad <junov@google.com>, Anne van Kesteren <annevk@annevk.nl>, "Tab Atkins Jr." <jackalmage@gmail.com>, Rick Waldron <waldron.rick@gmail.com>
- Cc: WHAT Working Group <whatwg@whatwg.org>
On Wed, 19 Jun 2013, Justin Novosad wrote:
>
> I was about to launch the implementation of window.createImageBitmap in
> Blink, and I received feedback on the blink-dev mailing list that the
> "Promise" API is the wave of the future for asynchronous JS, and that
> the new createImageBitmap method should use Promises.
>
> Current spec:
> http://www.whatwg.org/specs/web-apps/current-work/multipage/timers.html#images
>
> The proposal is to change the ImageBitmapFactories IDL to something like
> this:
>
> [NoInterfaceObject]
> interface ImageBitmapFactories {
> Promise createImageBitmap(ImageBitmapSource image, optional long sx, long
> sy, long sw, long sh);
> };
>
> The value of the promise would resolve to an ImageBitmap object.
Done.
On Thu, 20 Jun 2013, Anne van Kesteren wrote:
>
> I think something like
>
> interface ImageBitmap {
> static Promise create(ImageBitmapSource image, optional long sx,
> long sy, long sw, long sh);
> };
>
> would be much nicer.
Why?
On Thu, 20 Jun 2013, Justin Novosad wrote:
>
> I agree it would be nicer, but it seems less consistent with other
> existing APIs.
Indeed.
On Thu, 20 Jun 2013, Tab Atkins Jr. wrote:
>
> There's really no consistency here anyway, and the "Interface.create()"
> idiom is pretty easy and nice.
There are basically two styles:
- constructors (new Date(), new Function(), etc)
- factory methods on the "parent" object (document.createElement(),
implementation.createDocument(), context.createLinearGradient(), etc)
I don't think we have anything that uses the interface.create() pattern.
URL.createObjectURL() is the closest, and it's not a factory.
The constructor pattern is obviously better where possible, but in this
case it's not, since it has to be async (hence Promises).
--
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
Received on Wednesday, 17 July 2013 21:09:08 UTC