mirror of
https://github.com/zhigang1992/react-native.git
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2ca4770011
Summary: Calling the event emitters on the main thread seems to be problematic, so let's dispatch it via the JS thread. This requires some changes to make "eventTarget" single-use because otherwise the binding would need to synchronize the actual JS call with the act of releasing the target. Reviewed By: shergin Differential Revision: D8375291 fbshipit-source-id: bd2b42731176ae209f4a19c232309c163fb1c01b
51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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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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namespace facebook {
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namespace react {
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EventEmitter::EventEmitter(const InstanceHandle &instanceHandle, const Tag &tag, const SharedEventDispatcher &eventDispatcher):
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instanceHandle_(instanceHandle),
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tag_(tag),
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eventDispatcher_(eventDispatcher) {}
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EventEmitter::~EventEmitter() {}
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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
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) 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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EventTarget eventTarget = createEventTarget();
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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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// TODO(T29610783): Reconsider using dynamic dispatch here.
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eventDispatcher->dispatchEvent(eventTarget, type, extendedPayload, priority);
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}
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EventTarget EventEmitter::createEventTarget() const {
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auto &&eventDispatcher = eventDispatcher_.lock();
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assert(eventDispatcher);
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return eventDispatcher->createEventTarget(instanceHandle_);
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}
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} // namespace react
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} // namespace facebook
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