private void Finish(Location location)
{
var p = new Position();
if (location.HasAccuracy)
{
p.Accuracy = location.Accuracy;
}
if (location.HasAltitude)
{
p.Altitude = location.Altitude;
}
if (location.HasBearing)
{
p.Heading = location.Bearing;
}
if (location.HasSpeed)
{
p.Speed = location.Speed;
}
p.Longitude = location.Longitude;
p.Latitude = location.Latitude;
p.Timestamp = GeolocatorImplementation.GetTimestamp(location);
if (this.finishedCallback != null)
{
this.finishedCallback();
}
this.completionSource.TrySetResult(p);
}
public void OnLocationChanged(Location location)
{
if (location.Provider != this.activeProvider)
{
if (this.activeProvider != null && this.manager.IsProviderEnabled(this.activeProvider))
{
LocationProvider pr = this.manager.GetProvider(location.Provider);
TimeSpan lapsed = GetTimeSpan(location.Time) - GetTimeSpan(this.lastLocation.Time);
if (pr.Accuracy > this.manager.GetProvider(this.activeProvider).Accuracy &&
lapsed < timePeriod.Add(timePeriod))
{
location.Dispose();
return;
}
}
this.activeProvider = location.Provider;
}
var previous = Interlocked.Exchange(ref this.lastLocation, location);
if (previous != null)
{
previous.Dispose();
}
var p = new Position();
if (location.HasAccuracy)
{
p.Accuracy = location.Accuracy;
}
if (location.HasAltitude)
{
p.Altitude = location.Altitude;
}
if (location.HasBearing)
{
p.Heading = location.Bearing;
}
if (location.HasSpeed)
{
p.Speed = location.Speed;
}
p.Longitude = location.Longitude;
p.Latitude = location.Latitude;
p.Timestamp = GeolocatorImplementation.GetTimestamp(location);
var changed = PositionChanged;
if (changed != null)
{
changed(this, new PositionEventArgs(p));
}
}
private void HandleTimeout(object state)
{
if (state != null && (bool)state)
{
this.tcs.TrySetCanceled();
}
if (this.bestPosition != null)
{
this.tcs.TrySetResult(GeolocatorImplementation.GetPosition(this.bestPosition));
}
else
{
this.tcs.TrySetCanceled();
}
}
private void WatcherOnPositionChanged(object sender, GeoPositionChangedEventArgs <GeoCoordinate> e)
{
if (e.Position.Location.IsUnknown)
{
return;
}
bool isRecent = (e.Position.Timestamp - this.start).TotalMilliseconds < this.timeout;
if (e.Position.Location.HorizontalAccuracy <= this.desiredAccuracy && isRecent)
{
this.tcs.TrySetResult(GeolocatorImplementation.GetPosition(e.Position));
}
if (this.bestPosition == null || e.Position.Location.HorizontalAccuracy < this.bestPosition.Location.HorizontalAccuracy)
{
this.bestPosition = e.Position;
}
}
internal SinglePositionListener(double accuracy, int timeout, CancellationToken cancelToken)
{
cancelToken.Register(HandleTimeout, true);
this.desiredAccuracy = accuracy;
this.start = DateTime.Now;
this.timeout = timeout;
System.Threading.Tasks.Task.Factory.StartNew(() =>
{
this.watcher = new GeoCoordinateWatcher(GeolocatorImplementation.GetAccuracy(accuracy));
this.watcher.PositionChanged += WatcherOnPositionChanged;
this.watcher.StatusChanged += WatcherOnStatusChanged;
this.watcher.Start();
});
if (timeout != Timeout.Infinite)
{
this.timer = new Timer(HandleTimeout, null, timeout, Timeout.Infinite);
}
Task.ContinueWith(Cleanup);
}
