зеркало из https://github.com/mozilla/gecko-dev.git
63 строки
1.9 KiB
C++
63 строки
1.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_PromiseNativeHandler_h
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#define mozilla_dom_PromiseNativeHandler_h
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#include <functional>
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#include "js/TypeDecls.h"
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#include "nsISupports.h"
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namespace mozilla {
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namespace dom {
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class Promise;
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/*
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* PromiseNativeHandler allows C++ to react to a Promise being
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* rejected/resolved. A PromiseNativeHandler can be appended to a Promise using
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* Promise::AppendNativeHandler().
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*/
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class PromiseNativeHandler : public nsISupports {
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protected:
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virtual ~PromiseNativeHandler() = default;
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public:
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MOZ_CAN_RUN_SCRIPT
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virtual void ResolvedCallback(JSContext* aCx,
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JS::Handle<JS::Value> aValue) = 0;
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MOZ_CAN_RUN_SCRIPT
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virtual void RejectedCallback(JSContext* aCx,
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JS::Handle<JS::Value> aValue) = 0;
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};
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// This class is used to set C++ callbacks once a dom Promise a resolved or
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// rejected.
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class DomPromiseListener final : public PromiseNativeHandler {
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NS_DECL_ISUPPORTS
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public:
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using CallbackType = std::function<void(JSContext*, JS::Handle<JS::Value>)>;
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explicit DomPromiseListener(Promise* aDOMPromise);
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DomPromiseListener(Promise* aDOMPromise, CallbackType&& aResolve,
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CallbackType&& aReject);
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void SetResolvers(CallbackType&& aResolve, CallbackType&& aReject);
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void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue) override;
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void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue) override;
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private:
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~DomPromiseListener() = default;
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Maybe<CallbackType> mResolve;
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Maybe<CallbackType> mReject;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_PromiseNativeHandler_h
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