protected override void OnDataContextChanged(object previousContext, object newContext)
{
var previousAnnotations = MapView.Annotations.Where(a => !(a is MKUserLocation)).ToArray();
var isFirstLoading = previousAnnotations.Length == 0;
MapView.RemoveAnnotations(previousAnnotations);
if (DataContext != null &&
DataContext.HasAddresses())
{
var annotations = DataContext.Addresses
.Select(a => new MapViewAnnotation(
DataContext.Name.GetAbbreviation(2),
DataContext.Name,
a))
.ToArray();
var coordinates = MapUtil.GetAnnotationsCoordinates(annotations);
if (coordinates.Length > 0)
{
MapView.SetRegion(
MapUtil.CoordinateRegionForCoordinates(
coordinates,
new MKMapSize(3000, 3000)),
!isFirstLoading);
MapView.SetCenterCoordinate(
new CLLocationCoordinate2D(
annotations[0].Coordinate.Latitude + 0.00047, // moving a bit down to compensate callout height
annotations[0].Coordinate.Longitude),
!isFirstLoading);
MapView.AddAnnotations(annotations);
}
AddressLabel.Text = DataContext.GetAddressText();
}
else
{
AddressLabel.Text = null;
}
SetNeedsUpdateConstraints();
}
private void InitializeMapView()
{
if (ViewModel.OrgEvent != null &&
ViewModel.OrgEvent.Venues != null)
{
if (!_isMapViewInitialized)
{
VenuesMapView.RemoveAnnotations(VenuesMapView.Annotations);
if (!(VenuesMapView.WeakDelegate is MapDelegate))
{
var mapDelegate = new MapDelegate
{
SelectAnnotationCommand = ViewModel.SelectVenueOnMapCommand,
ShowDetailsCommand = ViewModel.NavigateVenueCommand
};
VenuesMapView.Delegate = mapDelegate;
}
var annotations = ViewModel.OrgEvent.Venues
.SelectMany(v => v.Info.Addresses
.Select(a => new VenueAnnotation(v, a))).ToArray();
var coordinates = MapUtil.GetAnnotationsCoordinates(annotations);
VenuesMapView.SetRegion(MapUtil.CoordinateRegionForCoordinates(coordinates, MapMargin), false);
VenuesMapView.AddAnnotations(annotations);
if (ViewModel.SelectedVenueOnMap != null)
{
SelectVenueMapAnnotation(ViewModel.SelectedVenueOnMap);
}
_isMapViewInitialized = true;
}
}
else
{
VenuesMapView.RemoveAnnotations(VenuesMapView.Annotations);
_isMapViewInitialized = false;
}
}
private void SelectVenueMapAnnotation(Venue venue)
{
if (venue != null)
{
var annotation = GetAnnotationByVenue(venue);
if (annotation != null)
{
VenuesMapView.SelectAnnotation(annotation, true);
}
}
else if (VenuesMapView.SelectedAnnotations != null &&
VenuesMapView.SelectedAnnotations.Any())
{
foreach (var annotation in VenuesMapView.SelectedAnnotations)
{
VenuesMapView.DeselectAnnotation(annotation, false);
}
var annotations = VenuesMapView.Annotations.OfType <VenueAnnotation>();
var coordinates = MapUtil.GetAnnotationsCoordinates(annotations);
VenuesMapView.SetRegion(MapUtil.CoordinateRegionForCoordinates(coordinates, MapMargin), true);
}
}
private void SelectAnnotation()
{
MapViewControl.RemoveAnnotations(MapViewControl.Annotations);
if (ViewModel.Annotation != null &&
ViewModel.Annotation.Addresses != null &&
ViewModel.Annotation.Addresses.Length > 0)
{
var annotations = ViewModel.Annotation.Addresses
.Select(address => new MapViewAnnotation(
ViewModel.Annotation.Pin,
ViewModel.Annotation.Title,
address)).ToArray();
var coordinates = MapUtil.GetAnnotationsCoordinates(annotations);
MapViewControl.SetRegion(
MapUtil.CoordinateRegionForCoordinates(
coordinates,
new MKMapSize(5000, 5000)),
false);
MapViewControl.AddAnnotations(annotations);
MapViewControl.SelectAnnotation(annotations[0], false);
}
}
