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 I'm planning on drafting something in http://dom.spec.whatwg.org/ based on https://github.com/slightlyoff/Promises/blob/master/ProgressFuture.idl 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? -- http://annevankesteren.nl/Received on Thursday, 8 August 2013 13:11:36 UTC
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