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https://github.com/zhigang1992/react-native.git
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802534e611
Summary: In React Native there are several use cases where React State is not the only input that affects the component tree. E.g., in case of a <Modal> component, the screen size directly affects the layout of components inside modal; in the case of uncontrolled <TextInput> component, the text inside the input affects the layout of the surrounding components. `State` is a special (legit!) workaround for all those similar cases. Native part of React Native maintains a special shared object between all nodes of the same family and use that during cloning and commits. See coming commits to know how to use that. In the near future State will fully replace LocalData concept but for simplicity they both exist for now. Reviewed By: mdvacca Differential Revision: D14217184 fbshipit-source-id: 6e018c5b68208d662462013bce0f4e2733d2f673
71 lines
1.7 KiB
C++
71 lines
1.7 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/core/EventBeat.h>
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#include <react/core/EventPipe.h>
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#include <react/core/RawEvent.h>
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#include <react/core/StatePipe.h>
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#include <react/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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EventPipe eventPipe,
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StatePipe statePipe,
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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(const 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(const 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;
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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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const EventPipe eventPipe_;
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const StatePipe statePipe_;
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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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};
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} // namespace react
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} // namespace facebook
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