react-native/Libraries/Settings/Settings.ios.js

77 lines
1.9 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 Settings
* @flow
*/
'use strict';
var RCTDeviceEventEmitter = require('RCTDeviceEventEmitter');
var RCTSettingsManager = require('NativeModules').SettingsManager;
var invariant = require('fbjs/lib/invariant');
var subscriptions: Array<{keys: Array<string>; callback: ?Function}> = [];
var Settings = {
_settings: RCTSettingsManager && RCTSettingsManager.settings,
get(key: string): mixed {
return this._settings[key];
},
set(settings: Object) {
this._settings = Object.assign(this._settings, settings);
RCTSettingsManager.setValues(settings);
},
watchKeys(keys: string | Array<string>, callback: Function): number {
if (typeof keys === 'string') {
keys = [keys];
}
invariant(
Array.isArray(keys),
'keys should be a string or array of strings'
);
var sid = subscriptions.length;
subscriptions.push({keys: keys, callback: callback});
return sid;
},
clearWatch(watchId: number) {
if (watchId < subscriptions.length) {
subscriptions[watchId] = {keys: [], callback: null};
}
},
_sendObservations(body: Object) {
Object.keys(body).forEach((key) => {
var newValue = body[key];
var didChange = this._settings[key] !== newValue;
this._settings[key] = newValue;
if (didChange) {
subscriptions.forEach((sub) => {
if (sub.keys.indexOf(key) !== -1 && sub.callback) {
sub.callback();
}
});
}
});
},
};
RCTDeviceEventEmitter.addListener(
'settingsUpdated',
Settings._sendObservations.bind(Settings)
);
module.exports = Settings;