Re: [promise] writing detailed spec of ProgressPromise & implementing it

On Thu, Aug 8, 2013 at 10:11 PM, Anne van Kesteren <annevk@annevk.nl> wrote:

> On Thu, Aug 8, 2013 at 9:15 AM, Yusuke Suzuki <yusukesuzuki@chromium.org>
> wrote:
> > We're planning to make ProgressPromise spec more detailed and implement
> it
> > on Blink experimentally.
> > ProgressPromise is planed to be used for some APIs, such as
> XMLHttpRequest /
> > FileAPI.
> >
> > Please feel free to comment about this.
>
> Mozilla has similar plans. Mostly for an <input type=file>-based
> directory picker:
> http://lists.w3.org/Archives/Public/public-whatwg-archive/2013Aug/0019.html
>

Thanks for heads up.


> I'm planning on drafting something in http://dom.spec.whatwg.org/
> based on
> https://github.com/slightlyoff/Promises/blob/master/ProgressFuture.idl


Great! We were wondering if anyone is working on or not.


> interface ProgressPromiseResolver : PromiseResolver {
>   void progress(optional any progressValue);
> };
>
> callback ProgressPromiseInit = void (ProgressPromiseResolver
> resolver); // maybe reuse PromiseInit
>
> [Constructor(ProgressPromiseInit init)]
> interface ProgressPromise : Promise {
>   // Returns the context object
>   ProgressPromise progress(optional AnyCallback progressHandler);
> };
>
> The then()/catch() methods on all Promise objects would still return
> an instance of Promise (not any subclass). Progress values would not
> forward.
>
> Does that match what you have in mind?
>

Yusuke has some thoughts and considerations. He'll follow up later.