71 lines
2.0 KiB
JavaScript
71 lines
2.0 KiB
JavaScript
|
/**
|
||
|
|
* Copyright (c) 2015-present, Facebook, Inc.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* This source code is licensed under the BSD-style license found in the
|
||
|
|
* LICENSE file in the root directory of this source tree. An additional grant
|
||
|
|
* of patent rights can be found in the PATENTS file in the same directory.
|
||
|
|
*
|
||
|
|
* @providesModule NativeEventEmitter
|
||
|
|
* @flow
|
||
|
|
*/
|
||
|
|
'use strict';
|
||
|
|
|
||
|
|
const EventEmitter = require('EventEmitter');
|
||
|
|
const Platform = require('Platform');
|
||
|
|
const RCTDeviceEventEmitter = require('RCTDeviceEventEmitter');
|
||
|
|
|
||
|
|
const invariant = require('fbjs/lib/invariant');
|
||
|
|
|
||
|
|
import type EmitterSubscription from 'EmitterSubscription';
|
||
|
|
|
||
|
|
type NativeModule = {
|
||
|
|
+addListener: (eventType: string) => void,
|
||
|
|
+removeListeners: (count: number) => void,
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Abstract base class for implementing event-emitting modules. This implements
|
||
|
|
* a subset of the standard EventEmitter node module API.
|
||
|
|
*/
|
||
|
|
class NativeEventEmitter extends EventEmitter {
|
||
|
|
_nativeModule: ?NativeModule;
|
||
|
|
|
||
|
|
constructor(nativeModule: ?NativeModule) {
|
||
|
|
super(RCTDeviceEventEmitter.sharedSubscriber);
|
||
|
|
if (Platform.OS === 'ios') {
|
||
|
|
invariant(nativeModule, 'Native module cannot be null.');
|
||
|
|
this._nativeModule = nativeModule;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
addListener(
|
||
|
|
eventType: string,
|
||
|
|
listener: Function,
|
||
|
|
context: ?Object,
|
||
|
|
): EmitterSubscription {
|
||
|
|
if (this._nativeModule != null) {
|
||
|
|
this._nativeModule.addListener(eventType);
|
||
|
|
}
|
||
|
|
return super.addListener(eventType, listener, context);
|
||
|
|
}
|
||
|
|
|
||
|
|
removeAllListeners(eventType: string) {
|
||
|
|
invariant(eventType, 'eventType argument is required.');
|
||
|
|
const count = this.listeners(eventType).length;
|
||
|
|
if (this._nativeModule != null) {
|
||
|
|
this._nativeModule.removeListeners(count);
|
||
|
|
}
|
||
|
|
super.removeAllListeners(eventType);
|
||
|
|
}
|
||
|
|
|
||
|
|
removeSubscription(subscription: EmitterSubscription) {
|
||
|
|
if (this._nativeModule != null) {
|
||
|
|
this._nativeModule.removeListeners(1);
|
||
|
|
}
|
||
|
|
super.removeSubscription(subscription);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = NativeEventEmitter;
|