mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Ramanpreet Nara
dabca52f77
Summary: RCTNetworking.startObserving and RCTNetworking.stopObserving don't exist. The main purpose of RCTEventEmitter.addListener is to call these methods, and increment the `_listeners` counter, so that we can start dispatching events when `_listeners > 0`. In D24272560, I made RCTEventEmitter dispatch events even when _listeners <= 0. This is sufficient for us to stop calling these two RCTNetworking methods entirely. Changelog: [Internal] Reviewed By: fkgozali Differential Revision: D24272663 fbshipit-source-id: de9c968bc71e6e6d69a22b934644e6dfa3266b3f
81 lines
2.4 KiB
JavaScript
81 lines
2.4 KiB
JavaScript
/**
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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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* @format
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* @flow
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*/
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'use strict';
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import Platform from '../Utilities/Platform';
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import EventEmitter from '../vendor/emitter/EventEmitter';
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import {type EventSubscription} from '../vendor/emitter/EventEmitter';
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import RCTDeviceEventEmitter from './RCTDeviceEventEmitter';
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import invariant from 'invariant';
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type NativeModule = {
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+addListener: (eventType: string) => void,
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+removeListeners: (count: number) => void,
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...
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};
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type NativeEventEmitterOptions = $ReadOnly<{|
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__SECRET_DISABLE_CALLS_INTO_MODULE_DO_NOT_USE_OR_YOU_WILL_BE_FIRED: boolean,
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|}>;
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const DEFAULT_NATIVE_EVENT_EMITTER_OPTIONS = {
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__SECRET_DISABLE_CALLS_INTO_MODULE_DO_NOT_USE_OR_YOU_WILL_BE_FIRED: false,
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};
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/**
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* Abstract base class for implementing event-emitting modules. This implements
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* a subset of the standard EventEmitter node module API.
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*/
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export default class NativeEventEmitter extends EventEmitter {
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_nativeModule: ?NativeModule;
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_disableCallsIntoModule: boolean;
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constructor(
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nativeModule: ?NativeModule,
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options: NativeEventEmitterOptions = DEFAULT_NATIVE_EVENT_EMITTER_OPTIONS,
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) {
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super(RCTDeviceEventEmitter.sharedSubscriber);
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this._disableCallsIntoModule =
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options.__SECRET_DISABLE_CALLS_INTO_MODULE_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
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if (Platform.OS === 'ios') {
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invariant(nativeModule, 'Native module cannot be null.');
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this._nativeModule = nativeModule;
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}
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}
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addListener(
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eventType: string,
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listener: Function,
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context: ?Object,
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): EventSubscription {
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if (this._nativeModule != null && !this._disableCallsIntoModule) {
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this._nativeModule.addListener(eventType);
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}
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return super.addListener(eventType, listener, context);
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}
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removeAllListeners(eventType: string) {
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invariant(eventType, 'eventType argument is required.');
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const count = this.listenerCount(eventType);
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if (this._nativeModule != null && !this._disableCallsIntoModule) {
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this._nativeModule.removeListeners(count);
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}
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super.removeAllListeners(eventType);
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}
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removeSubscription(subscription: EventSubscription) {
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if (this._nativeModule != null && !this._disableCallsIntoModule) {
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this._nativeModule.removeListeners(1);
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}
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super.removeSubscription(subscription);
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}
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}
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