diff options
Diffstat (limited to 'Xamarin.Forms.Maps.WinRT.Tablet/MapRenderer.cs')
| -rw-r--r-- | Xamarin.Forms.Maps.WinRT.Tablet/MapRenderer.cs | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/Xamarin.Forms.Maps.WinRT.Tablet/MapRenderer.cs b/Xamarin.Forms.Maps.WinRT.Tablet/MapRenderer.cs new file mode 100644 index 00000000..b3eba8ac --- /dev/null +++ b/Xamarin.Forms.Maps.WinRT.Tablet/MapRenderer.cs @@ -0,0 +1,249 @@ +using System; +using System.Collections.ObjectModel; +using System.Collections.Specialized; +using System.ComponentModel; +using System.Linq; +using System.Threading.Tasks; +using Windows.Devices.Geolocation; +using Windows.UI; +using Windows.UI.Xaml.Media; +using Windows.UI.Xaml.Shapes; +using Bing.Maps; +using Xamarin.Forms.Platform.WinRT; + +namespace Xamarin.Forms.Maps.WinRT +{ + public class MapRenderer : ViewRenderer<Map, Bing.Maps.Map> + { + bool _disposed; + bool _firstZoomLevelChangeFired; + Ellipse _userPositionCircle; + + protected override async void OnElementChanged(ElementChangedEventArgs<Map> e) + { + base.OnElementChanged(e); + + if (e.OldElement != null) + { + var mapModel = e.OldElement; + MessagingCenter.Unsubscribe<Map, MapSpan>(this, "MapMoveToRegion"); + ((ObservableCollection<Pin>)mapModel.Pins).CollectionChanged -= OnCollectionChanged; + } + + if (e.NewElement != null) + { + var mapModel = e.NewElement; + + if (Control == null) + { + SetNativeControl(new Bing.Maps.Map()); + Control.Credentials = FormsMaps.AuthenticationToken; + Control.ViewChanged += (s, a) => UpdateVisibleRegion(); + } + + MessagingCenter.Subscribe<Map, MapSpan>(this, "MapMoveToRegion", (s, a) => MoveToRegion(a), mapModel); + + UpdateMapType(); + UpdateHasScrollEnabled(); + UpdateHasZoomEnabled(); + + ((ObservableCollection<Pin>)mapModel.Pins).CollectionChanged += OnCollectionChanged; + + if (mapModel.Pins.Any()) + LoadPins(); + + await UpdateIsShowingUser(); + } + } + + protected override async void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e) + { + base.OnElementPropertyChanged(sender, e); + + if (e.PropertyName == Map.MapTypeProperty.PropertyName) + UpdateMapType(); + else if (e.PropertyName == Map.IsShowingUserProperty.PropertyName) + await UpdateIsShowingUser(); + else if (e.PropertyName == Map.HasScrollEnabledProperty.PropertyName) + UpdateHasScrollEnabled(); + else if (e.PropertyName == Map.HasZoomEnabledProperty.PropertyName) + UpdateHasZoomEnabled(); + } + + protected override void Dispose(bool disposing) + { + if (disposing && !_disposed) + { + _disposed = true; + + MessagingCenter.Unsubscribe<Map, MapSpan>(this, "MapMoveToRegion"); + + if (Element != null) + ((ObservableCollection<Pin>)Element.Pins).CollectionChanged -= OnCollectionChanged; + } + base.Dispose(disposing); + } + + async Task UpdateIsShowingUser() + { + if (Element.IsShowingUser) + { + var myGeolocator = new Geolocator(); + if (myGeolocator.LocationStatus != PositionStatus.NotAvailable && + myGeolocator.LocationStatus != PositionStatus.Disabled) + { + var userPosition = await myGeolocator.GetGeopositionAsync(); + if (userPosition?.Coordinate != null) + LoadUserPosition(userPosition.Coordinate, true); + } + } + else if (_userPositionCircle != null && Control.Children.Contains(_userPositionCircle)) + Control.Children.Remove(_userPositionCircle); + } + + void LoadPins() + { + foreach (var pin in Element.Pins) + LoadPin(pin); + } + + void ClearPins() + { + Control.Children.Clear(); + UpdateIsShowingUser(); + } + + void RemovePin(Pin pinToRemove) + { + var pushPin = Control.Children.FirstOrDefault(c => + { + var pin = (c as Pushpin); + return (pin != null && pin.DataContext.Equals(pinToRemove)); + }); + + if (pushPin != null) + Control.Children.Remove(pushPin); + } + + void LoadPin(Pin pin) + { + var pushPin = new Pushpin { Text = pin.Label, DataContext = pin }; + MapLayer.SetPosition(pushPin, new Location(pin.Position.Latitude, pin.Position.Longitude)); + pushPin.Tapped += (s, e) => ((s as Pushpin)?.DataContext as Pin)?.SendTap(); + Control.Children.Add(pushPin); + } + + void UpdateMapType() + { + switch (Element.MapType) + { + case MapType.Street: + Control.MapType = Bing.Maps.MapType.Road; + break; + case MapType.Satellite: + Control.MapType = Bing.Maps.MapType.Aerial; + break; + case MapType.Hybrid: + Control.MapType = Bing.Maps.MapType.Birdseye; + break; + } + } + + void MoveToRegion(MapSpan span) + { + var center = new Location(span.Center.Latitude, span.Center.Longitude); + var location = new LocationRect(center, span.LongitudeDegrees, span.LatitudeDegrees); + Control.SetView(location); + } + + void UpdateVisibleRegion() + { + if (Control == null || Element == null) + return; + + if (!_firstZoomLevelChangeFired) + { + MoveToRegion(Element.LastMoveToRegion); + _firstZoomLevelChangeFired = true; + return; + } + + var center = new Position(Control.Center.Latitude, Control.Center.Longitude); + + var boundingRegion = Control.Bounds; + var result = new MapSpan(center, boundingRegion.Height, boundingRegion.Width); + Element.VisibleRegion = result; + } + + void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e) + { + switch (e.Action) + { + case NotifyCollectionChangedAction.Add: + foreach (Pin pin in e.NewItems) + LoadPin(pin); + break; + case NotifyCollectionChangedAction.Move: + // no matter + break; + case NotifyCollectionChangedAction.Remove: + foreach (Pin pin in e.OldItems) + RemovePin(pin); + break; + case NotifyCollectionChangedAction.Replace: + foreach (Pin pin in e.OldItems) + RemovePin(pin); + foreach (Pin pin in e.NewItems) + LoadPin(pin); + break; + case NotifyCollectionChangedAction.Reset: + ClearPins(); + break; + } + } + + void LoadUserPosition(Geocoordinate userCoordinate, bool center) + { + var userPosition = new Location + { + Latitude = userCoordinate.Point.Position.Latitude, + Longitude = userCoordinate.Point.Position.Longitude + }; + + if (_userPositionCircle == null) + { + _userPositionCircle = new Ellipse + { + Stroke = new SolidColorBrush(Colors.White), + Fill = new SolidColorBrush(Colors.Blue), + StrokeThickness = 2, + Height = 20, + Width = 20, + Opacity = 50 + }; + } + + if (Control.Children.Contains(_userPositionCircle)) + Control.Children.Remove(_userPositionCircle); + + MapLayer.SetPosition(_userPositionCircle, userPosition); + MapLayer.SetPositionAnchor(_userPositionCircle, new Windows.Foundation.Point(0.5, 0.5)); + + Control.Children.Add(_userPositionCircle); + + if (center) + { + Control.Center = userPosition; + Control.ZoomLevel = 13; + } + } + + void UpdateHasZoomEnabled() + { + } + + void UpdateHasScrollEnabled() + { + } + } +}
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