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https://github.com/facebook/react-native.git
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Ruslan Shestopalyuk
407fb5c238
Summary: [Changelog][Internal] This adds a method, `emitDeviceEvent` to the C++ API of TurboModules, which allows to make calls to JS's `RCTDeviceEventEmitter.emit` from a C++ TurboModules. This is a very common pattern, specifically for the VR apps, but not only for them - e.g. Desktop fork also has a [custom implementation for this](https://www.internalfb.com/code/fbsource/third-party/microsoft-fork-of-react-native/react-native-utils/RCTEventEmitter.cpp). Note that my original intent was to actually backport the latter, however there are some complications with wiring things in a robust way, without exposing too much stuff and relying on singletons or folly::dynamic. So I ended up adding it to the TurboModule API itself and use the scheduler/JSI facilities instead. This approach is arguably well self-contained, uses high level APIs, and shouldn't be abusable much. Since I was trying to avoid usage of folly::dynamic in this case, I used a kind of "value factory" pattern instead in order to send the arguments to the JS thread in a thread safe way (see [the discussion here](https://fb.workplace.com/groups/rn.fabric/permalink/1398711453593610/)). Reviewed By: christophpurrer Differential Revision: D43466326 fbshipit-source-id: a3cb8359d08a46421559edd0f854772863cb5c39
33 lines
947 B
JavaScript
33 lines
947 B
JavaScript
/**
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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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* @flow strict
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* @format
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*/
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import type {IEventEmitter} from '../vendor/emitter/EventEmitter';
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import EventEmitter from '../vendor/emitter/EventEmitter';
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// FIXME: use typed events
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type RCTDeviceEventDefinitions = $FlowFixMe;
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/**
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* Global EventEmitter used by the native platform to emit events to JavaScript.
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* Events are identified by globally unique event names.
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*
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* NativeModules that emit events should instead subclass `NativeEventEmitter`.
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*/
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const RCTDeviceEventEmitter: IEventEmitter<RCTDeviceEventDefinitions> =
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new EventEmitter();
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Object.defineProperty(global, '__rctDeviceEventEmitter', {
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configurable: true,
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value: RCTDeviceEventEmitter,
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});
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export default (RCTDeviceEventEmitter: IEventEmitter<RCTDeviceEventDefinitions>);
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