mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
James Ide
0ee5f68929
Summary: This is the next step in moving RN towards standard path-based requires. All the requires in `Libraries` have been rewritten to use relative requires with a few exceptions, namely, `vendor` and `Renderer/oss` since those need to be changed upstream. This commit uses relative requires instead of `react-native/...` so that if Facebook were to stop syncing out certain folders and therefore remove code from the react-native package, internal code at Facebook would not need to change. See the umbrella issue at https://github.com/facebook/react-native/issues/24316 for more detail. [General] [Changed] - Migrate "Libraries" from Haste to standard path-based requires Pull Request resolved: https://github.com/facebook/react-native/pull/24749 Differential Revision: D15258017 Pulled By: cpojer fbshipit-source-id: a1f480ea36c05c659b6f37c8f02f6f9216d5a323
114 lines
3.1 KiB
JavaScript
114 lines
3.1 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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* @flow
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* @format
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*/
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'use strict';
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const DeviceEventManager = require('../BatchedBridge/NativeModules')
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.DeviceEventManager;
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const RCTDeviceEventEmitter = require('../EventEmitter/RCTDeviceEventEmitter');
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const DEVICE_BACK_EVENT = 'hardwareBackPress';
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type BackPressEventName = 'backPress' | 'hardwareBackPress';
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const _backPressSubscriptions = [];
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RCTDeviceEventEmitter.addListener(DEVICE_BACK_EVENT, function() {
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for (let i = _backPressSubscriptions.length - 1; i >= 0; i--) {
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if (_backPressSubscriptions[i]()) {
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return;
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}
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}
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BackHandler.exitApp();
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});
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/**
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* Detect hardware button presses for back navigation.
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*
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* Android: 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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* tvOS: Detect presses of the menu button on the TV remote. (Still to be implemented:
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* programmatically disable menu button handling
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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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* iOS: Not applicable.
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*
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* The event subscriptions are called in reverse order (i.e. last registered subscription first),
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* and if one subscription returns true then subscriptions registered earlier will not be called.
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*
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* Example:
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*
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* ```javascript
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* BackHandler.addEventListener('hardwareBackPress', function() {
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* // this.onMainScreen and this.goBack are just examples, you need to use your own implementation here
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* // Typically you would use the navigator here to go to the last state.
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*
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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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type TBackHandler = {|
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+exitApp: () => void,
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+addEventListener: (
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eventName: BackPressEventName,
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handler: Function,
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) => {remove: () => void},
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+removeEventListener: (
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eventName: BackPressEventName,
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handler: Function,
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) => void,
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|};
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const BackHandler: TBackHandler = {
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exitApp: function(): void {
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DeviceEventManager.invokeDefaultBackPressHandler();
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},
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/**
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* Adds an event handler. Supported events:
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*
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* - `hardwareBackPress`: Fires when the Android hardware back button is pressed or when the
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* tvOS menu button is pressed.
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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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): {remove: () => void} {
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if (_backPressSubscriptions.indexOf(handler) === -1) {
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_backPressSubscriptions.push(handler);
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}
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return {
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remove: (): void => BackHandler.removeEventListener(eventName, handler),
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};
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},
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/**
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* Removes the event 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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if (_backPressSubscriptions.indexOf(handler) !== -1) {
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_backPressSubscriptions.splice(
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_backPressSubscriptions.indexOf(handler),
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1,
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);
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}
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},
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};
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module.exports = BackHandler;
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