protected override void OnElementChanged(ElementChangedEventArgs <View> e)
{
base.OnElementChanged(e);
// For XAML Previewer or FormsGoogleMaps.Init not called.
if (!FormsGoogleMaps.IsInitialized)
{
var label = new UILabel()
{
Text = "Xamarin.Forms.GoogleMaps",
BackgroundColor = Color.Teal.ToUIColor(),
TextColor = Color.Black.ToUIColor(),
TextAlignment = UITextAlignment.Center
};
SetNativeControl(label);
return;
}
var oldMapView = (MapView)Control;
if (e.OldElement != null)
{
_cameraLogic.Unregister();
}
if (e.NewElement != null)
{
var mapModel = (Map)e.NewElement;
if (Control == null)
{
SetNativeControl(new MapView(RectangleF.Empty));
var mkMapView = (MapView)Control;
mkMapView.CameraPositionChanged += CameraPositionChanged;
mkMapView.CoordinateTapped += CoordinateTapped;
mkMapView.CoordinateLongPressed += CoordinateLongPressed;
mkMapView.DidTapMyLocationButton = DidTapMyLocation;
}
_cameraLogic.Register(Map, NativeMap);
_cameraLogic.MoveCamera(mapModel.InitialCameraUpdate);
UpdateMapType();
UpdateIsShowingUser();
UpdateHasScrollEnabled();
UpdateHasZoomEnabled();
UpdateHasRotationEnabled();
UpdateIsTrafficEnabled();
UpdatePadding();
foreach (var logic in _logics)
{
logic.Register(oldMapView, (Map)e.OldElement, NativeMap, Map);
logic.RestoreItems();
logic.OnMapPropertyChanged(new PropertyChangedEventArgs(Map.SelectedPinProperty.PropertyName));
}
}
}
void UpdateVisibleRegion()
{
if (Control == null || Element == null)
{
return;
}
if (!_firstZoomLevelChangeFired)
{
_cameraLogic.MoveCamera(Map.InitialCameraUpdate);
_firstZoomLevelChangeFired = true;
return;
}
try
{
var boundingBox = GetBounds(this.Control);
if (boundingBox != null)
{
var center = new Position(boundingBox.Center.Latitude, boundingBox.Center.Longitude);
var latitudeDelta = Math.Abs(center.Latitude - boundingBox.NorthwestCorner.Latitude);
var longitudeDelta = Math.Abs(center.Longitude - boundingBox.NorthwestCorner.Longitude);
Element.VisibleRegion = new MapSpan(center, latitudeDelta, longitudeDelta);
}
}
catch (Exception)
{
//couldnt update visible region
}
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
base.OnLayout(changed, l, t, r, b);
// For XAML Previewer or FormsGoogleMaps.Init not called.
if (!FormsGoogleMaps.IsInitialized)
{
return;
}
_onLayout = true;
if (_ready && _onLayout)
{
InitializeLogic();
}
else if (changed && NativeMap != null)
{
UpdateVisibleRegion(NativeMap.CameraPosition.Target);
_cameraLogic.MoveCamera(Map.InitialCameraUpdate);
}
}
void InitializeLogic()
{
_cameraLogic.MoveCamera(Map.InitialCameraUpdate);
foreach (var logic in Logics)
{
if (logic.Map != null)
{
logic.RestoreItems();
logic.OnMapPropertyChanged(new PropertyChangedEventArgs(MapBase.SelectedPinProperty.PropertyName));
}
}
_ready = false;
_onLayout = false;
}
public override void LayoutSubviews()
{
base.LayoutSubviews();
// For XAML Previewer or FormsGoogleMaps.Init not called.
if (!FormsGoogleMaps.IsInitialized)
{
return;
}
if (_shouldUpdateRegion && !_ready)
{
_cameraLogic.MoveCamera(((Map)Element).InitialCameraUpdate);
_ready = true;
_shouldUpdateRegion = false;
}
}
public override void LayoutSubviews()
{
base.LayoutSubviews();
// For XAML Previewer or GoogleMapsSystem.Init not called.
if (!GoogleMapsSystem.IsInitialized)
{
return;
}
if (_shouldUpdateRegion && !_ready)
{
_cameraLogic.MoveCamera(((MapBase)Element).InitialCameraUpdate);
_ready = true;
_shouldUpdateRegion = false;
UpdateMyLocationEnabled();
}
}
void UpdateVisibleRegion()
{
if (Control == null || Element == null)
{
return;
}
if (!_firstZoomLevelChangeFired)
{
_cameraLogic.MoveCamera(Map.InitialCameraUpdate);
_firstZoomLevelChangeFired = true;
return;
}
try
{
var boundingBox = GetBounds(this.Control);
if (boundingBox != null)
{
//Hack 1
//Begin
var center = new Position(boundingBox.Center.Latitude, boundingBox.Center.Longitude);
var latitudeDelta = Math.Abs(center.Latitude - boundingBox.NorthwestCorner.Latitude);
var longitudeDelta = Math.Abs(center.Longitude - boundingBox.NorthwestCorner.Longitude);
Element.VisibleRegion = new MapSpan(center, latitudeDelta, longitudeDelta);
//End
//Could it replace Hack 1?
//Element.Region = new MapRegion(new Position(boundingBox.NorthwestCorner.Latitude, boundingBox.SoutheastCorner.Longitude), boundingBox.SoutheastCorner.ToPosition(), boundingBox.NorthwestCorner.ToPosition(), new Position(boundingBox.SoutheastCorner.Latitude, boundingBox.NorthwestCorner.Longitude));
// Simone Marra
UpdateCornersBounds(this.Control);
// End Simone Marra
}
}
catch (Exception)
{
//couldnt update visible region
}
}
