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Diffstat (limited to 'Xamarin.Forms.Maps.Android/MapRenderer.cs')
-rw-r--r--Xamarin.Forms.Maps.Android/MapRenderer.cs308
1 files changed, 308 insertions, 0 deletions
diff --git a/Xamarin.Forms.Maps.Android/MapRenderer.cs b/Xamarin.Forms.Maps.Android/MapRenderer.cs
new file mode 100644
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+++ b/Xamarin.Forms.Maps.Android/MapRenderer.cs
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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+using System.ComponentModel;
+using System.Linq;
+using Android.Gms.Maps;
+using Android.Gms.Maps.Model;
+using Android.OS;
+using Java.Lang;
+using Xamarin.Forms.Platform.Android;
+using Math = System.Math;
+using Android.Runtime;
+using System.Collections;
+
+namespace Xamarin.Forms.Maps.Android
+{
+ public class MapRenderer : ViewRenderer,
+ GoogleMap.IOnCameraChangeListener
+ {
+ public MapRenderer ()
+ {
+ AutoPackage = false;
+ }
+
+ static Bundle s_bundle;
+ internal static Bundle Bundle { set { s_bundle = value; } }
+
+ List<Marker> _markers;
+
+ const string MoveMessageName = "MapMoveToRegion";
+
+ protected GoogleMap NativeMap => ((MapView) Control).Map;
+
+ protected Map Map => (Map) Element;
+
+ public override SizeRequest GetDesiredSize (int widthConstraint, int heightConstraint)
+ {
+ return new SizeRequest (new Size (Context.ToPixels (40), Context.ToPixels (40)));
+ }
+
+ protected override void OnElementChanged (ElementChangedEventArgs<View> e)
+ {
+ base.OnElementChanged (e);
+
+ var oldMapView = (MapView)Control;
+
+ var mapView = new MapView (Context);
+ mapView.OnCreate (s_bundle);
+ mapView.OnResume ();
+ SetNativeControl (mapView);
+
+ if (e.OldElement != null) {
+ var oldMapModel = (Map) e.OldElement;
+ ((ObservableCollection<Pin>)oldMapModel.Pins).CollectionChanged -= OnCollectionChanged;
+
+ MessagingCenter.Unsubscribe<Map, MapSpan> (this, MoveMessageName);
+
+ if (oldMapView.Map != null) {
+ oldMapView.Map.SetOnCameraChangeListener (null);
+ NativeMap.InfoWindowClick -= MapOnMarkerClick;
+ }
+
+ oldMapView.Dispose();
+ }
+
+ var map = NativeMap;
+ if (map != null) {
+ map.SetOnCameraChangeListener (this);
+ NativeMap.InfoWindowClick += MapOnMarkerClick;
+
+ map.UiSettings.ZoomControlsEnabled = Map.HasZoomEnabled;
+ map.UiSettings.ZoomGesturesEnabled = Map.HasZoomEnabled;
+ map.UiSettings.ScrollGesturesEnabled = Map.HasScrollEnabled;
+ map.MyLocationEnabled = map.UiSettings.MyLocationButtonEnabled = Map.IsShowingUser;
+ SetMapType ();
+ }
+
+ MessagingCenter.Subscribe<Map, MapSpan> (this, MoveMessageName, OnMoveToRegionMessage, Map);
+
+ var incc = Map.Pins as INotifyCollectionChanged;
+ if (incc != null)
+ incc.CollectionChanged += OnCollectionChanged;
+ }
+
+ void OnCollectionChanged (object sender, NotifyCollectionChangedEventArgs notifyCollectionChangedEventArgs)
+ {
+ switch (notifyCollectionChangedEventArgs.Action) {
+ case NotifyCollectionChangedAction.Add:
+ AddPins (notifyCollectionChangedEventArgs.NewItems);
+ break;
+ case NotifyCollectionChangedAction.Remove:
+ RemovePins (notifyCollectionChangedEventArgs.OldItems);
+ break;
+ case NotifyCollectionChangedAction.Replace:
+ RemovePins (notifyCollectionChangedEventArgs.OldItems);
+ AddPins (notifyCollectionChangedEventArgs.NewItems);
+ break;
+ case NotifyCollectionChangedAction.Reset:
+ _markers?.ForEach (m => m.Remove ());
+ _markers = null;
+ AddPins ((IList)(Element as Map).Pins);
+ break;
+ case NotifyCollectionChangedAction.Move:
+ //do nothing
+ break;
+ }
+ }
+
+ void OnMoveToRegionMessage (Map s, MapSpan a)
+ {
+ MoveToRegion (a, true);
+ }
+
+ void MoveToRegion (MapSpan span, bool animate)
+ {
+ var map = NativeMap;
+ if (map == null)
+ return;
+
+ span = span.ClampLatitude (85, -85);
+ var ne = new LatLng (span.Center.Latitude + span.LatitudeDegrees / 2, span.Center.Longitude + span.LongitudeDegrees / 2);
+ var sw = new LatLng (span.Center.Latitude - span.LatitudeDegrees / 2, span.Center.Longitude - span.LongitudeDegrees / 2);
+ var update = CameraUpdateFactory.NewLatLngBounds (new LatLngBounds (sw, ne), 0);
+
+ try {
+ if (animate)
+ map.AnimateCamera (update);
+ else
+ map.MoveCamera (update);
+ } catch (IllegalStateException exc) {
+ System.Diagnostics.Debug.WriteLine ("MoveToRegion exception: " + exc);
+ }
+ }
+
+ bool _init = true;
+
+ protected override void OnLayout (bool changed, int l, int t, int r, int b)
+ {
+ base.OnLayout (changed, l, t, r, b);
+
+ if (_init) {
+ MoveToRegion (((Map)Element).LastMoveToRegion, false);
+ OnCollectionChanged (((Map)Element).Pins, new NotifyCollectionChangedEventArgs( NotifyCollectionChangedAction.Reset));
+ _init = false;
+ } else if (changed) {
+ UpdateVisibleRegion (NativeMap.CameraPosition.Target);
+ }
+ }
+
+ protected override void OnElementPropertyChanged (object sender, PropertyChangedEventArgs e)
+ {
+ base.OnElementPropertyChanged (sender, e);
+
+ if (e.PropertyName == Map.MapTypeProperty.PropertyName) {
+ SetMapType();
+ return;
+ }
+
+ var gmap = NativeMap;
+ if (gmap == null)
+ return;
+
+ if (e.PropertyName == Map.IsShowingUserProperty.PropertyName)
+ gmap.MyLocationEnabled = gmap.UiSettings.MyLocationButtonEnabled = Map.IsShowingUser;
+ else if (e.PropertyName == Map.HasScrollEnabledProperty.PropertyName)
+ gmap.UiSettings.ScrollGesturesEnabled = Map.HasScrollEnabled;
+ else if (e.PropertyName == Map.HasZoomEnabledProperty.PropertyName) {
+ gmap.UiSettings.ZoomControlsEnabled = Map.HasZoomEnabled;
+ gmap.UiSettings.ZoomGesturesEnabled = Map.HasZoomEnabled;
+ }
+ }
+
+ void SetMapType ()
+ {
+ var map = NativeMap;
+ if (map == null)
+ return;
+
+ switch (Map.MapType) {
+ case MapType.Street:
+ map.MapType = GoogleMap.MapTypeNormal;
+ break;
+ case MapType.Satellite:
+ map.MapType = GoogleMap.MapTypeSatellite;
+ break;
+ case MapType.Hybrid:
+ map.MapType = GoogleMap.MapTypeHybrid;
+ break;
+ default:
+ throw new ArgumentOutOfRangeException ();
+ }
+ }
+
+ public void OnCameraChange (CameraPosition pos)
+ {
+ UpdateVisibleRegion (pos.Target);
+ }
+
+ void UpdateVisibleRegion (LatLng pos)
+ {
+ var map = NativeMap;
+ if (map == null)
+ return;
+ var projection = map.Projection;
+ var width = Control.Width;
+ var height = Control.Height;
+ var ul = projection.FromScreenLocation (new global::Android.Graphics.Point (0, 0));
+ var ur = projection.FromScreenLocation (new global::Android.Graphics.Point (width, 0));
+ var ll = projection.FromScreenLocation (new global::Android.Graphics.Point (0, height));
+ var lr = projection.FromScreenLocation (new global::Android.Graphics.Point (width, height));
+ var dlat = Math.Max (Math.Abs (ul.Latitude - lr.Latitude), Math.Abs (ur.Latitude - ll.Latitude));
+ var dlong = Math.Max (Math.Abs (ul.Longitude - lr.Longitude), Math.Abs (ur.Longitude - ll.Longitude));
+ ((Map)Element).VisibleRegion = new MapSpan (
+ new Position (
+ pos.Latitude,
+ pos.Longitude
+ ),
+ dlat,
+ dlong
+ );
+ }
+
+ void AddPins (IList pins)
+ {
+ var map = NativeMap;
+ if (map == null)
+ return;
+
+ if (_markers == null)
+ _markers = new List<Marker> ();
+
+ _markers.AddRange( pins.Cast<Pin>().Select (p => {
+ var pin = (Pin)p;
+ var opts = new MarkerOptions ();
+ opts.SetPosition (new LatLng (pin.Position.Latitude, pin.Position.Longitude));
+ opts.SetTitle (pin.Label);
+ opts.SetSnippet (pin.Address);
+ var marker = map.AddMarker (opts);
+
+ // associate pin with marker for later lookup in event handlers
+ pin.Id = marker.Id;
+ return marker;
+ }));
+ }
+
+ void RemovePins (IList pins)
+ {
+ var map = NativeMap;
+ if (map == null)
+ return;
+ if (_markers == null)
+ return;
+
+ foreach (Pin p in pins) {
+ var marker = _markers.FirstOrDefault (m => m.Id == p.Id);
+ if (marker == null)
+ continue;
+ marker.Remove ();
+ _markers.Remove (marker);
+ }
+ }
+
+ void MapOnMarkerClick (object sender, GoogleMap.InfoWindowClickEventArgs eventArgs)
+ {
+ // clicked marker
+ var marker = eventArgs.Marker;
+
+ // lookup pin
+ Pin targetPin = null;
+ for (var i = 0; i < Map.Pins.Count; i++) {
+ var pin = Map.Pins[i];
+ if ((string)pin.Id != marker.Id)
+ continue;
+
+ targetPin = pin;
+ break;
+ }
+
+ // only consider event handled if a handler is present.
+ // Else allow default behavior of displaying an info window.
+ targetPin?.SendTap ();
+ }
+
+ bool _disposed;
+ protected override void Dispose (bool disposing)
+ {
+ if (disposing && !_disposed) {
+ _disposed = true;
+
+ var mapModel = Element as Map;
+ if (mapModel != null) {
+ MessagingCenter.Unsubscribe<Map, MapSpan> (this, MoveMessageName);
+ ((ObservableCollection<Pin>)mapModel.Pins).CollectionChanged -= OnCollectionChanged;
+ }
+
+ var gmap = NativeMap;
+ if (gmap == null)
+ return;
+ gmap.MyLocationEnabled = false;
+ gmap.InfoWindowClick -= MapOnMarkerClick;
+ gmap.Dispose ();
+ }
+
+ base.Dispose (disposing);
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-16 06:29:57 +0000