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https://github.com/status-im/react-native.git
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cb45eaa0e8
Summary:
public
Map and Set are a standard JavaScript features, but are only supported in a subset of JSC versions that we target (e.g. iOS 7's JSC doesn't support Set).
The consequence of this is that failing to require('Set') before using it won't error during testing on a modern OS, but will fail on older OS versions. This diff makes the Map and Set polyfills available globally to all RN apps to avoid that problem.
Reviewed By: davidaurelio
Differential Revision: D2833997
fb-gh-sync-id: 713d8b69f6a1bce2472a1b2e6b84f69d75f30289
76 lines
1.7 KiB
JavaScript
76 lines
1.7 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule BackAndroid
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*/
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'use strict';
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var DeviceEventManager = require('NativeModules').DeviceEventManager;
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var RCTDeviceEventEmitter = require('RCTDeviceEventEmitter');
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var DEVICE_BACK_EVENT = 'hardwareBackPress';
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type BackPressEventName = $Enum<{
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backPress: string;
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}>;
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var _backPressSubscriptions = new Set();
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RCTDeviceEventEmitter.addListener(DEVICE_BACK_EVENT, function() {
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var invokeDefault = true;
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_backPressSubscriptions.forEach((subscription) => {
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if (subscription()) {
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invokeDefault = false;
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}
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});
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if (invokeDefault) {
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BackAndroid.exitApp();
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}
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});
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/**
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* Detect hardware back button presses, and programmatically invoke the default back button
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* functionality to exit the app if there are no listeners or if none of the listeners return true.
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*
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* Example:
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*
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* ```js
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* BackAndroid.addEventListener('hardwareBackPress', function() {
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* if (!this.onMainScreen()) {
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* this.goBack();
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* return true;
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* }
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* return false;
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* });
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* ```
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*/
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var BackAndroid = {
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exitApp: function() {
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DeviceEventManager.invokeDefaultBackPressHandler();
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},
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addEventListener: function (
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eventName: BackPressEventName,
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handler: Function
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): void {
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_backPressSubscriptions.add(handler);
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},
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removeEventListener: function(
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eventName: BackPressEventName,
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handler: Function
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): void {
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_backPressSubscriptions.delete(handler);
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},
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};
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module.exports = BackAndroid;
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