async void MyMapView_GeoViewTapped(System.Object sender, Esri.ArcGISRuntime.Xamarin.Forms.GeoViewInputEventArgs e)
{
// Clear any currently visible callouts, route graphics, or selections
MyMapView.DismissCallout();
_routeGraphicsOverlay.Graphics.Clear();
_placesGraphicsOverlay.ClearSelection();
// Get the place under the tap
IdentifyGraphicsOverlayResult idResult = await MyMapView.IdentifyGraphicsOverlayAsync(_placesGraphicsOverlay, e.Position, 12, false);
Graphic clickedElement = idResult.Graphics.FirstOrDefault();
if (clickedElement != null)
{
// Select the place to highlight it; get name and address
clickedElement.IsSelected = true;
string name = clickedElement.Attributes["Name"].ToString();
string address = clickedElement.Attributes["Address"].ToString();
// Create a callout definition that shows the name and address for the place; set the element as a tag
CalloutDefinition definition = new CalloutDefinition(name, address);
definition.Tag = clickedElement;
// Handle button clicks for the button on the callout
// This event receives the value assigned as the CalloutDefinition.Tag
// ** Fix API ref for this!
// https://developers.arcgis.com/net/latest/wpf/api-reference/html/P_Esri_ArcGISRuntime_UI_CalloutDefinition_OnButtonClick.htm
definition.OnButtonClick = new Action <object>(async(tag) =>
{
// Get the geoelement that represents the place
GeoElement poiElement = tag as GeoElement;
if (poiElement == null)
{
return;
}
// Call a function in the viewmodel that will route to this location
var routeGraphic = await _viewModel.RouteToPoiAsync(_deviceLocation, poiElement.Geometry as MapPoint, MyMapView.SpatialReference);
// Add the route graphic to the map view and zoom to its extent
_routeGraphicsOverlay.Graphics.Add(routeGraphic);
await MyMapView.SetViewpointGeometryAsync(routeGraphic.Geometry, 30);
});
// Set the button icon and show the callout at the click location
definition.ButtonImage = WalkIcon;
MyMapView.ShowCalloutAt(e.Location, definition);
}
}
