react-native/Libraries/EventEmitter/RCTDeviceEventEmitter.js

72 lines
2.2 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 RCTDeviceEventEmitter
* @flow
*/
'use strict';
const EventEmitter = require('EventEmitter');
const EventSubscriptionVendor = require('EventSubscriptionVendor');
import type EmitterSubscription from 'EmitterSubscription';
function checkNativeEventModule(eventType: ?string) {
if (eventType) {
if (eventType.lastIndexOf('statusBar', 0) === 0) {
throw new Error('`' + eventType + '` event should be registered via the StatusBarIOS module');
}
if (eventType.lastIndexOf('keyboard', 0) === 0) {
throw new Error('`' + eventType + '` event should be registered via the Keyboard module');
}
if (eventType === 'appStateDidChange' || eventType === 'memoryWarning') {
throw new Error('`' + eventType + '` event should be registered via the AppState module');
}
}
}
/**
* Deprecated - subclass NativeEventEmitter to create granular event modules instead of
* adding all event listeners directly to RCTDeviceEventEmitter.
*/
class RCTDeviceEventEmitter extends EventEmitter {
sharedSubscriber: EventSubscriptionVendor;
constructor() {
const sharedSubscriber = new EventSubscriptionVendor();
super(sharedSubscriber);
this.sharedSubscriber = sharedSubscriber;
}
addListener(eventType: string, listener: Function, context: ?Object): EmitterSubscription {
if (__DEV__) {
checkNativeEventModule(eventType);
}
return super.addListener(eventType, listener, context);
}
removeAllListeners(eventType: ?string) {
if (__DEV__) {
checkNativeEventModule(eventType);
}
super.removeAllListeners(eventType);
}
removeSubscription(subscription: EmitterSubscription) {
if (subscription.emitter !== this) {
subscription.emitter.removeSubscription(subscription);
} else {
super.removeSubscription(subscription);
}
}
}
module.exports = new RCTDeviceEventEmitter();