mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Samuel Susla
2016460528
Summary: Changelog: [internal] This is a mechanism that will guess event's React priority based on other events ongoing on the platform. If an event happens within span of ContinuousStart -> ContinuousEnd and its category is unspecified, we deduce it's React priority to be default. All other events are discrete. Special case: `onScroll`, which is always treated as "Default". Reviewed By: JoshuaGross Differential Revision: D28485060 fbshipit-source-id: d2eae63dbcf03271dfed97128a1590dd165a3ce2
77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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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 <memory>
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#include <mutex>
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#include <vector>
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#include <jsi/jsi.h>
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#include <react/renderer/core/EventBeat.h>
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#include <react/renderer/core/EventQueueProcessor.h>
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#include <react/renderer/core/RawEvent.h>
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#include <react/renderer/core/StateUpdate.h>
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namespace facebook {
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namespace react {
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/*
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* Event Queue synchronized with given Event Beat and dispatching event
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* using given Event Pipe.
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*/
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class EventQueue {
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public:
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EventQueue(
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EventQueueProcessor eventProcessor,
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std::unique_ptr<EventBeat> eventBeat);
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virtual ~EventQueue() = default;
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/*
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* Enqueues and (probably later) dispatch a given event.
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* Can be called on any thread.
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*/
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void enqueueEvent(RawEvent &&rawEvent) const;
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/*
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* Enqueues and (probably later) dispatches a given event.
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* Deletes last RawEvent from the queue if it has the same type and target.
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* Can be called on any thread.
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*/
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void enqueueUniqueEvent(RawEvent &&rawEvent) const;
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/*
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* Enqueues and (probably later) dispatch a given state update.
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* Can be called on any thread.
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*/
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void enqueueStateUpdate(StateUpdate &&stateUpdate) const;
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protected:
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/*
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* Called on any enqueue operation.
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* Override in subclasses to trigger beat `request` and/or beat `induce`.
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* Default implementation does nothing.
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*/
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virtual void onEnqueue() const = 0;
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void onBeat(jsi::Runtime &runtime) const;
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void flushEvents(jsi::Runtime &runtime) const;
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void flushStateUpdates() const;
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EventQueueProcessor eventProcessor_;
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const std::unique_ptr<EventBeat> eventBeat_;
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// Thread-safe, protected by `queueMutex_`.
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mutable std::vector<RawEvent> eventQueue_;
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mutable std::vector<StateUpdate> stateUpdateQueue_;
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mutable std::mutex queueMutex_;
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mutable bool hasContinuousEventStarted_{false};
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};
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} // namespace react
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} // namespace facebook
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