138 lines
3.9 KiB
JavaScript
138 lines
3.9 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 Geolocation
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* @flow
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*/
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'use strict';
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const NativeEventEmitter = require('NativeEventEmitter');
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const RCTLocationObserver = require('NativeModules').LocationObserver;
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const invariant = require('fbjs/lib/invariant');
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const logError = require('logError');
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const warning = require('fbjs/lib/warning');
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const LocationEventEmitter = new NativeEventEmitter(RCTLocationObserver);
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var subscriptions = [];
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var updatesEnabled = false;
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type GeoOptions = {
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timeout: number;
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maximumAge: number;
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enableHighAccuracy: bool;
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distanceFilter: number;
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}
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/**
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* The Geolocation API follows the web spec:
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* https://developer.mozilla.org/en-US/docs/Web/API/Geolocation
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*
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* ### iOS
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* You need to include the `NSLocationWhenInUseUsageDescription` key
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* in Info.plist to enable geolocation. Geolocation is enabled by default
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* when you create a project with `react-native init`.
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*
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* ### Android
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* To request access to location, you need to add the following line to your
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* app's `AndroidManifest.xml`:
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*
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* `<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />`
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*
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*/
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var Geolocation = {
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/*
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* Invokes the success callback once with the latest location info. Supported
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* options: timeout (ms), maximumAge (ms), enableHighAccuracy (bool)
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* On Android, this can return almost immediately if the location is cached or
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* request an update, which might take a while.
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*/
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getCurrentPosition: function(
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geo_success: Function,
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geo_error?: Function,
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geo_options?: GeoOptions
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) {
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invariant(
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typeof geo_success === 'function',
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'Must provide a valid geo_success callback.'
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);
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RCTLocationObserver.getCurrentPosition(
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geo_options || {},
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geo_success,
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geo_error || logError
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);
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},
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/*
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* Invokes the success callback whenever the location changes. Supported
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* options: timeout (ms), maximumAge (ms), enableHighAccuracy (bool), distanceFilter(m)
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*/
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watchPosition: function(success: Function, error?: Function, options?: GeoOptions): number {
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if (!updatesEnabled) {
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RCTLocationObserver.startObserving(options || {});
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updatesEnabled = true;
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}
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var watchID = subscriptions.length;
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subscriptions.push([
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LocationEventEmitter.addListener(
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'geolocationDidChange',
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success
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),
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error ? LocationEventEmitter.addListener(
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'geolocationError',
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error
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) : null,
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]);
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return watchID;
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},
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clearWatch: function(watchID: number) {
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var sub = subscriptions[watchID];
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if (!sub) {
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// Silently exit when the watchID is invalid or already cleared
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// This is consistent with timers
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return;
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}
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sub[0].remove();
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// array element refinements not yet enabled in Flow
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var sub1 = sub[1]; sub1 && sub1.remove();
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subscriptions[watchID] = undefined;
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var noWatchers = true;
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for (var ii = 0; ii < subscriptions.length; ii++) {
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if (subscriptions[ii]) {
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noWatchers = false; // still valid subscriptions
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}
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}
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if (noWatchers) {
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Geolocation.stopObserving();
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}
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},
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stopObserving: function() {
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if (updatesEnabled) {
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RCTLocationObserver.stopObserving();
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updatesEnabled = false;
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for (var ii = 0; ii < subscriptions.length; ii++) {
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var sub = subscriptions[ii];
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if (sub) {
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warning('Called stopObserving with existing subscriptions.');
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sub[0].remove();
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// array element refinements not yet enabled in Flow
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var sub1 = sub[1]; sub1 && sub1.remove();
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}
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}
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subscriptions = [];
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}
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}
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};
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module.exports = Geolocation;
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