mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Samuel Susla
2669118fc8
Summary: Changelog: [internal] Previous implementation of coalescing would only look at the last element in `eventQueue_` and if it was the same type and target, it would coalesce the two together. This was problem when user would scroll in UIScrollView, this triggers onTouchMove and onScroll events at high rates and prevents coalescing of them. This changes changes the behaviour to search the `eventQueue_` backwards for an event of the same type and target. If one if found, it is moved into its place. If even of another type is found before for the same target, the event is pushed back onto the queue. Reviewed By: JoshuaGross Differential Revision: D24992941 fbshipit-source-id: fc1eae4ecd100af6202346674778b0634ed7a15b
42 lines
981 B
C++
42 lines
981 B
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 <react/renderer/core/EventQueue.h>
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namespace facebook {
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namespace react {
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/*
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* Event Queue that dispatches event in batches synchronizing them with
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* an Event Beat.
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*/
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class BatchedEventQueue final : public EventQueue {
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public:
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BatchedEventQueue(
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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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bool enableV2EventCoalescing);
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void onEnqueue() const override;
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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(const RawEvent &rawEvent) const;
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private:
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bool const enableV2EventCoalescing_;
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};
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} // namespace react
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} // namespace facebook
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