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