47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <folly/dynamic.h>
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namespace facebook {
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namespace react {
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enum class EventPriority: int {
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SynchronousUnbatched,
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SynchronousBatched,
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AsynchronousUnbatched,
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AsynchronousBatched,
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Sync = SynchronousUnbatched,
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Work = SynchronousBatched,
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Interactive = AsynchronousUnbatched,
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Deferred = AsynchronousBatched
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};
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/* `InstanceHandler`, `EventTarget`, and `EventHandler` are all opaque
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* raw pointers. We use `struct {} *` trick to differentiate them in compiler's
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* eyes to ensure type safety.
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* These structs must have names (and the names must be exported)
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* to allow consistent template (e.g. `std::function`) instantiating
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* across different modules.
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*/
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using EventTarget = struct EventTargetDummyStruct {} *;
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using EventHandler = struct EventHandlerDummyStruct {} *;
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/*
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* EmptyEventTarget is used when some event cannot be dispatched to an original
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* event target but still has to be dispatched to preserve consistency of event flow.
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*/
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static const EventTarget EmptyEventTarget = nullptr;
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using EventPipe = std::function<void(const EventTarget &eventTarget, const std::string &type, const folly::dynamic &payload)>;
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} // namespace react
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} // namespace facebook
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