mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Samuel Susla
e97e3499c3
Summary: Changelog: [internal] To avoid unnecessary string copy in event pipeline, use move semantics. Event pipeline has ownership of event type. Passing it by reference ends up in a copy when `RawEvent` object is constructed. To avoid this, pass string by value through each layer and use move semantics to avoid extra copies. Reviewed By: javache Differential Revision: D34392608 fbshipit-source-id: c11d221be345665e165d9edbc360ba5a057e3890
74 lines
1.7 KiB
C++
74 lines
1.7 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and 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 <react/renderer/core/LayoutMetrics.h>
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#include <react/renderer/core/ReactPrimitives.h>
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#include "TouchEventEmitter.h"
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namespace facebook {
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namespace react {
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class ViewEventEmitter;
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using SharedViewEventEmitter = std::shared_ptr<const ViewEventEmitter>;
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class ViewEventEmitter : public TouchEventEmitter {
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public:
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using TouchEventEmitter::TouchEventEmitter;
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#pragma mark - Accessibility
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void onAccessibilityAction(std::string const &name) const;
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void onAccessibilityTap() const;
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void onAccessibilityMagicTap() const;
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void onAccessibilityEscape() const;
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#pragma mark - Layout
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void onLayout(const LayoutMetrics &layoutMetrics) const;
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private:
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/*
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* Contains the most recent `frame` and a `mutex` protecting access to it.
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*/
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struct LayoutEventState {
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/*
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* Protects an access to other fields of the struct.
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*/
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std::mutex mutex;
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/*
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* Last dispatched `frame` value or value that's being dispatched right now.
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*/
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Rect frame{};
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/*
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* Indicates that the `frame` value was already dispatched (and dispatching
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* of the *same* value is not needed).
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*/
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bool wasDispatched{false};
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/*
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* Indicates that some lambda is already being dispatching (and dispatching
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* another one is not needed).
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*/
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bool isDispatching{false};
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};
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mutable std::shared_ptr<LayoutEventState> layoutEventState_{
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std::make_shared<LayoutEventState>()};
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};
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} // namespace react
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} // namespace facebook
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