51 lines
1.1 KiB
JavaScript
51 lines
1.1 KiB
JavaScript
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/**
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* Copyright (c) Meta Platforms, Inc. and 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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*/
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'use strict';
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const _backPressSubscriptions = new Set();
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const BackHandler = {
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exitApp: jest.fn(),
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addEventListener: function (
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eventName: BackPressEventName,
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handler: () => ?boolean,
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): {remove: () => void} {
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_backPressSubscriptions.add(handler);
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return {
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remove: () => BackHandler.removeEventListener(eventName, handler),
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};
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},
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removeEventListener: function (
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eventName: BackPressEventName,
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handler: () => ?boolean,
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): void {
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_backPressSubscriptions.delete(handler);
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},
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mockPressBack: function () {
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let invokeDefault = true;
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const subscriptions = [..._backPressSubscriptions].reverse();
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for (let i = 0; i < subscriptions.length; ++i) {
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if (subscriptions[i]()) {
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invokeDefault = false;
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break;
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}
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}
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if (invokeDefault) {
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BackHandler.exitApp();
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}
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},
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};
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module.exports = BackHandler;
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