UWP location service added.

Author: davidbritch

src/Mobile/eShopOnContainers/eShopOnContainers.Windows/Helpers/Timeout.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace eShopOnContainers.Windows.Helpers
+{
+    internal class Timeout
+    {
+        public const int Infinite = -1;
+        readonly CancellationTokenSource _canceller = new CancellationTokenSource();
+
+        public Timeout(int timeout, Action timesUp)
+        {
+            if (timeout == Infinite)
+                return;
+            if (timeout < 0)
+                throw new ArgumentOutOfRangeException("timeoutMilliseconds");
+            if (timesUp == null)
+                throw new ArgumentNullException("timesUp");
+
+            Task.Delay(TimeSpan.FromMilliseconds(timeout), _canceller.Token).ContinueWith(t =>
+            {
+                if (!t.IsCanceled)
+                    timesUp();
+            });
+        }
+
+        public void Cancel()
+        {
+            _canceller.Cancel();
+        }
+    }
+}

src/Mobile/eShopOnContainers/eShopOnContainers.Windows/Services/LocationServiceImplementation.cs

@@ -0,0 +1,166 @@
+using eShopOnContainers.Core.Models.Location;
+using eShopOnContainers.Core.Services.Location;
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Windows.Devices.Geolocation;
+using Windows.Foundation;
+
+[assembly: Xamarin.Forms.Dependency(typeof(ILocationServiceImplementation))]
+namespace eShopOnContainers.Windows.Services
+{
+    public class LocationServiceImplementation : ILocationServiceImplementation
+    {
+        double _desiredAccuracy;
+        Geolocator _locator = new Geolocator();
+
+        public LocationServiceImplementation()
+        {
+            DesiredAccuracy = 100;
+        }
+
+        #region Internal Implementation
+
+        Geolocator GetGeolocator()
+        {
+            var loc = _locator;
+            if (loc == null)
+            {
+                _locator = new Geolocator();
+                _locator.StatusChanged += OnLocatorStatusChanged;
+                loc = _locator;
+            }
+            return loc;
+        }
+
+        PositionStatus GetGeolocatorStatus()
+        {
+            var loc = GetGeolocator();
+            return loc.LocationStatus;
+        }
+
+        static Position GetPosition(Geoposition position)
+        {
+            var pos = new Position
+            {
+                Accuracy = position.Coordinate.Accuracy,
+                Altitude = position.Coordinate.Point.Position.Altitude,
+                Latitude = position.Coordinate.Point.Position.Latitude,
+                Longitude = position.Coordinate.Point.Position.Longitude,
+                Timestamp = position.Coordinate.Timestamp.ToUniversalTime()
+            };
+
+            if (position.Coordinate.Heading != null)
+                pos.Heading = position.Coordinate.Heading.Value;
+            if (position.Coordinate.Speed != null)
+                pos.Speed = position.Coordinate.Speed.Value;
+            if (position.Coordinate.AltitudeAccuracy.HasValue)
+                pos.AltitudeAccuracy = position.Coordinate.AltitudeAccuracy.Value;
+
+            return pos;
+        }
+
+        async void OnLocatorStatusChanged(Geolocator sender, StatusChangedEventArgs e)
+        {
+            GeolocationError error;
+
+            switch (e.Status)
+            {
+                case PositionStatus.Disabled:
+                    error = GeolocationError.Unauthorized;
+                    break;
+                case PositionStatus.NoData:
+                    error = GeolocationError.PositionUnavailable;
+                    break;
+                default:
+                    return;
+            }
+            _locator = null;
+        }
+
+        #endregion
+
+        #region ILocationServiceImplementation
+
+        public double DesiredAccuracy
+        {
+            get { return _desiredAccuracy; }
+            set
+            {
+                _desiredAccuracy = value;
+                GetGeolocator().DesiredAccuracy = (value < 100) ? PositionAccuracy.High : PositionAccuracy.Default;
+            }
+        }
+
+        public event EventHandler<PositionErrorEventArgs> PositionError;
+        public event EventHandler<PositionEventArgs> PositionChanged;
+
+        public bool IsGeolocationAvailable
+        {
+            get
+            {
+                var status = GetGeolocatorStatus();
+                while (status == PositionStatus.Initializing)
+                {
+                    Task.Delay(10).Wait();
+                    status = GetGeolocatorStatus();
+                }
+                return status != PositionStatus.NotAvailable;
+            }
+        }
+
+        public bool IsGeolocationEnabled
+        {
+            get
+            {
+                var status = GetGeolocatorStatus();
+                while (status == PositionStatus.Initializing)
+                {
+                    Task.Delay(10).Wait();
+                    status = GetGeolocatorStatus();
+                }
+                return status != PositionStatus.Disabled && status != PositionStatus.NotAvailable;
+            }
+        }
+
+        public Task<Position> GetPositionAsync(TimeSpan? timeout = null, CancellationToken? cancelToken = null, bool includeHeading = false)
+        {
+            var timeoutMilliseconds = timeout.HasValue ? (int)timeout.Value.TotalMilliseconds : eShopOnContainers.Windows.Helpers.Timeout.Infinite;
+            if (timeoutMilliseconds < 0 && timeoutMilliseconds != eShopOnContainers.Windows.Helpers.Timeout.Infinite)
+                throw new ArgumentOutOfRangeException(nameof(timeout));
+
+            if (!cancelToken.HasValue)
+                cancelToken = CancellationToken.None;
+
+            var pos = GetGeolocator().GetGeopositionAsync(TimeSpan.FromTicks(0), TimeSpan.FromDays(365));
+            cancelToken.Value.Register(o => ((IAsyncOperation<Geoposition>)o).Cancel(), pos);
+            var timer = new eShopOnContainers.Windows.Helpers.Timeout(timeoutMilliseconds, pos.Cancel);
+            var tcs = new TaskCompletionSource<Position>();
+
+            pos.Completed = (op, s) =>
+            {
+                timer.Cancel();
+
+                switch (s)
+                {
+                    case AsyncStatus.Canceled:
+                        tcs.SetCanceled();
+                        break;
+                    case AsyncStatus.Completed:
+                        tcs.SetResult(GetPosition(op.GetResults()));
+                        break;
+                    case AsyncStatus.Error:
+                        var ex = op.ErrorCode;
+                        if (ex is UnauthorizedAccessException)
+                            ex = new GeolocationException(GeolocationError.Unauthorized, ex);
+
+                        tcs.SetException(ex);
+                        break;
+                }
+            };
+            return tcs.Task;           
+        }
+
+        #endregion
+    }
+}

src/Mobile/eShopOnContainers/eShopOnContainers.Windows/eShopOnContainers.Windows.csproj

@@ -115,12 +115,14 @@
     <Compile Include="Effects\EntryLineColorEffect.cs" />
     <Compile Include="Extensions\VisualTreeExtensions.cs" />
     <Compile Include="Helpers\ColorHelper.cs" />
+    <Compile Include="Helpers\Timeout.cs" />
     <Compile Include="MainPage.xaml.cs">
       <DependentUpon>MainPage.xaml</DependentUpon>
     </Compile>
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Renderers\CustomTabbedPageRenderer.cs" />
     <Compile Include="Renderers\SlideDownMenuPageRenderer.cs" />
+    <Compile Include="Services\LocationServiceImplementation.cs" />
     <Compile Include="Services\SettingsServiceImplementation.cs" />
   </ItemGroup>
   <ItemGroup>