51 lines
1.1 KiB
JavaScript
51 lines
1.1 KiB
JavaScript
/**
|
|
* Copyright (c) 2013-present, Facebook, Inc.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*
|
|
* @format
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
const _backPressSubscriptions = new Set();
|
|
|
|
const BackHandler = {
|
|
exitApp: jest.fn(),
|
|
|
|
addEventListener: function(
|
|
eventName: BackPressEventName,
|
|
handler: Function,
|
|
): {remove: () => void} {
|
|
_backPressSubscriptions.add(handler);
|
|
return {
|
|
remove: () => BackHandler.removeEventListener(eventName, handler),
|
|
};
|
|
},
|
|
|
|
removeEventListener: function(
|
|
eventName: BackPressEventName,
|
|
handler: Function,
|
|
): void {
|
|
_backPressSubscriptions.delete(handler);
|
|
},
|
|
|
|
mockPressBack: function() {
|
|
let invokeDefault = true;
|
|
const subscriptions = [..._backPressSubscriptions].reverse();
|
|
for (let i = 0; i < subscriptions.length; ++i) {
|
|
if (subscriptions[i]()) {
|
|
invokeDefault = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (invokeDefault) {
|
|
BackHandler.exitApp();
|
|
}
|
|
},
|
|
};
|
|
|
|
module.exports = BackHandler;
|