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https://github.com/status-im/react-native.git
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97f9e4082c
Summary: The mutex is a "leaf" mutex, so the code cannot reenter that, so there is no reason to be a recursive one. Reviewed By: sahrens Differential Revision: D13642592 fbshipit-source-id: 0fb64d3405c5d3408251dc983c186f6747bc6ee2
105 lines
2.8 KiB
C++
105 lines
2.8 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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#include "EventEmitter.h"
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#include <folly/dynamic.h>
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#include <jsi/JSIDynamic.h>
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#include <jsi/jsi.h>
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#include <react/debug/SystraceSection.h>
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#include "RawEvent.h"
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namespace facebook {
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namespace react {
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// TODO(T29874519): Get rid of "top" prefix once and for all.
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/*
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* Capitalizes the first letter of the event type and adds "top" prefix if
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* necessary (e.g. "layout" becames "topLayout").
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*/
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static std::string normalizeEventType(const std::string &type) {
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auto prefixedType = type;
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if (type.find("top", 0) != 0) {
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prefixedType.insert(0, "top");
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prefixedType[3] = toupper(prefixedType[3]);
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}
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return prefixedType;
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}
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std::mutex &EventEmitter::DispatchMutex() {
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static std::mutex mutex;
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return mutex;
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}
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ValueFactory EventEmitter::defaultPayloadFactory() {
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static auto payloadFactory =
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ValueFactory{[](jsi::Runtime &runtime) { return jsi::Object(runtime); }};
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return payloadFactory;
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}
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EventEmitter::EventEmitter(
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SharedEventTarget eventTarget,
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Tag tag,
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WeakEventDispatcher eventDispatcher)
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: eventTarget_(std::move(eventTarget)),
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eventDispatcher_(std::move(eventDispatcher)) {}
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void EventEmitter::dispatchEvent(
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const std::string &type,
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const folly::dynamic &payload,
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const EventPriority &priority) const {
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dispatchEvent(
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type,
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[payload](jsi::Runtime &runtime) {
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return valueFromDynamic(runtime, payload);
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},
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priority);
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}
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void EventEmitter::dispatchEvent(
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const std::string &type,
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const ValueFactory &payloadFactory,
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const EventPriority &priority) const {
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SystraceSection s("EventEmitter::dispatchEvent");
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auto eventDispatcher = eventDispatcher_.lock();
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if (!eventDispatcher) {
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return;
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}
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eventDispatcher->dispatchEvent(
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RawEvent(normalizeEventType(type), payloadFactory, eventTarget_),
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priority);
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}
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void EventEmitter::setEnabled(bool enabled) const {
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enableCounter_ += enabled ? 1 : -1;
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bool shouldBeEnabled = enableCounter_ > 0;
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if (isEnabled_ != shouldBeEnabled) {
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isEnabled_ = shouldBeEnabled;
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if (eventTarget_) {
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eventTarget_->setEnabled(isEnabled_);
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}
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}
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// Note: Initially, the state of `eventTarget_` and the value `enableCounter_`
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// is mismatched intentionally (it's `non-null` and `0` accordingly). We need
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// this to support an initial nebula state where the event target must be
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// retained without any associated mounted node.
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bool shouldBeRetained = enableCounter_ > 0;
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if (shouldBeRetained != (eventTarget_ != nullptr)) {
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if (!shouldBeRetained) {
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eventTarget_.reset();
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}
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}
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}
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} // namespace react
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} // namespace facebook
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