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https://github.com/status-im/react-native.git
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764dd511d2
Summary: The first implementation of EventEmitter's enable/disable feature didn't not provide a way to enable an object after it was disabled. Apparently, we need this functionality due that fact that all nodes of the same family share same event emitter. Reviewed By: mdvacca Differential Revision: D10395849 fbshipit-source-id: 0eba54f0bb7ded35d64afb6559e6e27208c2b577
85 lines
2.1 KiB
C++
85 lines
2.1 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 "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::recursive_mutex &EventEmitter::DispatchMutex() {
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static std::recursive_mutex mutex;
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return mutex;
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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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weakEventTarget_({}),
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tag_(tag),
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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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auto eventDispatcher = eventDispatcher_.lock();
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if (!eventDispatcher) {
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return;
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}
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// Mixing `target` into `payload`.
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assert(payload.isObject());
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folly::dynamic extendedPayload = folly::dynamic::object("target", tag_);
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extendedPayload.merge_patch(payload);
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eventDispatcher->dispatchEvent(
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RawEvent(normalizeEventType(type), extendedPayload, eventTarget_),
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priority);
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}
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void EventEmitter::setEnabled(bool enabled) const {
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bool alreadyEnabled = eventTarget_ != nullptr;
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if (enabled == alreadyEnabled) {
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return;
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}
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if (enabled) {
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eventTarget_ = weakEventTarget_.lock();
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weakEventTarget_.reset();
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} else {
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weakEventTarget_ = eventTarget_;
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eventTarget_.reset();
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}
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}
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bool EventEmitter::getEnabled() const {
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return eventTarget_ != nullptr;
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}
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} // namespace react
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} // namespace facebook
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