mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Samuel Susla
09cb12c26c
Summary: Changelog: [internal] EventPriority is backed by int, passing it by reference doesn't provide any performance benefits. Quite contrary, it can make it slower because of indirectness (in our case it is probably negligible). Reviewed By: mdvacca Differential Revision: D27938600 fbshipit-source-id: 37d1312627dd5a8f9012dfb35d21afe716a16ad7
100 lines
2.7 KiB
C++
100 lines
2.7 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 <folly/dynamic.h>
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#include <react/renderer/core/EventDispatcher.h>
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#include <react/renderer/core/EventPriority.h>
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#include <react/renderer/core/EventTarget.h>
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#include <react/renderer/core/ReactPrimitives.h>
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namespace facebook {
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namespace react {
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class EventEmitter;
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using SharedEventEmitter = std::shared_ptr<const EventEmitter>;
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/*
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* Base class for all particular typed event handlers.
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* Stores a pointer to `EventTarget` identifying a particular component and
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* a weak pointer to `EventDispatcher` which is responsible for delivering the
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* event.
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*/
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class EventEmitter {
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public:
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using Shared = std::shared_ptr<EventEmitter const>;
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static std::mutex &DispatchMutex();
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static ValueFactory defaultPayloadFactory();
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EventEmitter(
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SharedEventTarget eventTarget,
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Tag tag,
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EventDispatcher::Weak eventDispatcher);
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virtual ~EventEmitter() = default;
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/*
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* Enables/disables event emitter.
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* Enabled event emitter retains a pointer to `eventTarget` strongly (as
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* `std::shared_ptr`) whereas disabled one don't.
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* Enabled/disabled state is also proxied to `eventTarget` where it indicates
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* a possibility to extract JSI value from it.
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* The enable state is additive; a number of `enable` calls should be equal to
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* a number of `disable` calls to release the event target.
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* `DispatchMutex` must be acquired before calling.
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*/
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void setEnabled(bool enabled) const;
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protected:
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#ifdef ANDROID
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// We need this temporarily due to lack of Java-counterparts for particular
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// subclasses.
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public:
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#endif
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/*
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* Initiates an event delivery process.
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* Is used by particular subclasses only.
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*/
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void dispatchEvent(
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const std::string &type,
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const ValueFactory &payloadFactory =
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EventEmitter::defaultPayloadFactory(),
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EventPriority priority = EventPriority::AsynchronousBatched) const;
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void dispatchEvent(
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const std::string &type,
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const folly::dynamic &payload,
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EventPriority priority = EventPriority::AsynchronousBatched) const;
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void dispatchUniqueEvent(
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const std::string &type,
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const ValueFactory &payloadFactory =
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EventEmitter::defaultPayloadFactory()) const;
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private:
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void toggleEventTargetOwnership_() const;
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friend class UIManagerBinding;
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mutable SharedEventTarget eventTarget_;
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EventDispatcher::Weak eventDispatcher_;
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mutable int enableCounter_{0};
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mutable bool isEnabled_{false};
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};
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} // namespace react
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} // namespace facebook
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