public async void getCurrentPosition(
JObject options,
ICallback success,
ICallback error)
{
var locationOptions = LocationOptions.FromJson(options);
var geolocator = new Geolocator
{
DesiredAccuracy = locationOptions.HighAccuracy ? PositionAccuracy.High : PositionAccuracy.Default,
MovementThreshold = locationOptions.DistanceFilter,
};
try
{
// TODO: Enable retrieval from position history using `MaximumAge` filter
var task = geolocator.GetGeopositionAsync().AsTask();
var completedTask = await Task.WhenAny(
task,
Task.Delay(TimeSpan.FromMilliseconds(locationOptions.Timeout))).ConfigureAwait(false);
if (completedTask == task)
{
var geoposition = await task.ConfigureAwait(false);
success.Invoke(ConvertGeoposition(geoposition));
}
else
{
error.Invoke("Location request timed out");
}
}
catch (Exception ex)
{
error.Invoke($"Location request failed with exception: {ex}");
}
}
public void startObserving(JObject options)
{
var locationOptions = LocationOptions.FromJson(options);
var geolocator = new Geolocator
{
DesiredAccuracy = locationOptions.HighAccuracy ? PositionAccuracy.High : PositionAccuracy.Default,
MovementThreshold = locationOptions.DistanceFilter,
};
var positionObservable =
Observable.FromEventPattern <
TypedEventHandler <Geolocator, PositionChangedEventArgs>,
Geolocator,
PositionChangedEventArgs>(
h => geolocator.PositionChanged += h,
h => geolocator.PositionChanged -= h);
var positionQuery = from e in positionObservable
select e.EventArgs.Position;
var positionSubscription = positionQuery.Subscribe(position =>
Context.GetJavaScriptModule <RCTDeviceEventEmitter>()
.emit("geolocationDidChange", ConvertGeoposition(position)));
var statusObservable =
Observable.FromEventPattern <
TypedEventHandler <Geolocator, StatusChangedEventArgs>,
Geolocator,
StatusChangedEventArgs>(
h => geolocator.StatusChanged += h,
h => geolocator.StatusChanged -= h);
var statusQuery = from e in statusObservable
select e.EventArgs.Status;
var statusSubscription = statusQuery.Subscribe(status =>
{
if (status == PositionStatus.Disabled)
{
Context.GetJavaScriptModule <RCTDeviceEventEmitter>()
.emit("geolocationError", "Location settings are turned off.");
}
else if (status == PositionStatus.NotAvailable)
{
Context.GetJavaScriptModule <RCTDeviceEventEmitter>()
.emit("geolocationError", "Location services is not available.");
}
else if (status == PositionStatus.NoData || status == PositionStatus.Initializing)
{
Context.GetJavaScriptModule <RCTDeviceEventEmitter>()
.emit("geolocationError", "Location services is temporarily unavailable.");
}
});
_currentSubscription.Disposable =
new CompositeDisposable(2)
{
positionSubscription,
statusSubscription,
};
}
