/// <summary>
/// Initializes a new instance of the <see cref="StartPage"/> class.
/// </summary>
public StartPage()
{
InitializeComponent();
InitializeBasemapSwitcher();
PictureMarkerSymbol endMapPin = CreateMapPin("end.png");
PictureMarkerSymbol startMapPin = CreateMapPin("start.png");
var geocodeViewModel = Resources["GeocodeViewModel"] as GeocodeViewModel;
var fromGeocodeViewModel = Resources["FromGeocodeViewModel"] as GeocodeViewModel;
var toGeocodeViewModel = Resources["ToGeocodeViewModel"] as GeocodeViewModel;
_routeViewModel = Resources["RouteViewModel"] as RouteViewModel;
geocodeViewModel.PropertyChanged += (o, e) =>
{
switch (e.PropertyName)
{
case nameof(GeocodeViewModel.Place):
{
var graphicsOverlay = MapView.GraphicsOverlays["PlacesOverlay"];
graphicsOverlay?.Graphics.Clear();
GeocodeResult place = geocodeViewModel.Place;
if (place == null)
{
return;
}
var graphic = new Graphic(geocodeViewModel.Place.DisplayLocation, endMapPin);
graphicsOverlay?.Graphics.Add(graphic);
break;
}
}
};
fromGeocodeViewModel.PropertyChanged += (o, e) =>
{
switch (e.PropertyName)
{
case nameof(GeocodeViewModel.Place):
{
_routeViewModel.FromPlace = fromGeocodeViewModel.Place;
break;
}
}
};
toGeocodeViewModel.PropertyChanged += (o, e) =>
{
switch (e.PropertyName)
{
case nameof(GeocodeViewModel.Place):
{
_routeViewModel.ToPlace = toGeocodeViewModel.Place;
break;
}
}
};
_routeViewModel.PropertyChanged += (s, e) =>
{
switch (e.PropertyName)
{
case nameof(RouteViewModel.Route):
{
var graphicsOverlay = MapView.GraphicsOverlays["RouteOverlay"];
// clear existing graphics
graphicsOverlay?.Graphics?.Clear();
if (_routeViewModel.FromPlace == null || _routeViewModel.ToPlace == null ||
_routeViewModel.Route == null || graphicsOverlay == null)
{
return;
}
// Add route to map
var routeGraphic = new Graphic(_routeViewModel.Route.Routes.FirstOrDefault()?.RouteGeometry);
graphicsOverlay?.Graphics.Add(routeGraphic);
// Add start and end locations to the map
var fromGraphic = new Graphic(_routeViewModel.FromPlace.RouteLocation, startMapPin);
var toGraphic = new Graphic(_routeViewModel.ToPlace.RouteLocation, endMapPin);
graphicsOverlay?.Graphics.Add(fromGraphic);
graphicsOverlay?.Graphics.Add(toGraphic);
break;
}
}
};
// start location services
var mapViewModel = Resources["MapViewModel"] as MapViewModel;
MapView.LocationDisplay.DataSource = mapViewModel.LocationDataSource;
MapView.LocationDisplay.AutoPanMode = LocationDisplayAutoPanMode.Recenter;
MapView.LocationDisplay.IsEnabled = true;
#if __IOS__
// This is necessary because on iOS the SearchBar doesn't get unfocused automatically when a geocode result is selected
SearchSuggestionsList.ItemSelected += (s, e) =>
{
AddressSearchBar.Unfocus();
};
FromLocationSuggestionsList.ItemSelected += (s, e) =>
{
FromLocationTextBox.Unfocus();
};
ToLocationSuggestionsList.ItemSelected += (s, e) =>
{
ToLocationTextBox.Unfocus();
};
#endif
}
/// <summary>
/// Performs initialization
/// </summary>
private async void Initialize()
{
try
{
var routeStyle = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, System.Drawing.Color.FromArgb(0x00, 0x79, 0xc1), 5);
RouteRenderer.Symbol = routeStyle;
PictureMarkerSymbol endMapPin = await CreateMapPin("end.png");
PictureMarkerSymbol startMapPin = await CreateMapPin("start.png");
var geocodeViewModel = Resources["GeocodeViewModel"] as GeocodeViewModel;
var fromGeocodeViewModel = Resources["FromGeocodeViewModel"] as GeocodeViewModel;
var toGeocodeViewModel = Resources["ToGeocodeViewModel"] as GeocodeViewModel;
_routeViewModel = Resources["RouteViewModel"] as RouteViewModel;
_basemapViewModel = Resources["BasemapsViewModel"] as BasemapsViewModel;
_userItemsViewModel = Resources["UserItemsViewModel"] as UserItemsViewModel;
geocodeViewModel.PropertyChanged += (o, e) =>
{
switch (e.PropertyName)
{
case nameof(GeocodeViewModel.Place):
{
var graphicsOverlay = MapView.GraphicsOverlays["PlacesOverlay"];
graphicsOverlay?.Graphics.Clear();
GeocodeResult place = geocodeViewModel.Place;
if (place == null)
{
return;
}
var graphic = new Graphic(geocodeViewModel.Place.DisplayLocation, endMapPin);
graphicsOverlay?.Graphics.Add(graphic);
break;
}
}
};
fromGeocodeViewModel.PropertyChanged += (o, e) =>
{
switch (e.PropertyName)
{
case nameof(GeocodeViewModel.Place):
{
_routeViewModel.FromPlace = fromGeocodeViewModel.Place;
break;
}
}
};
toGeocodeViewModel.PropertyChanged += (o, e) =>
{
switch (e.PropertyName)
{
case nameof(GeocodeViewModel.Place):
{
_routeViewModel.ToPlace = toGeocodeViewModel.Place;
break;
}
}
};
_routeViewModel.PropertyChanged += (s, e) =>
{
switch (e.PropertyName)
{
case nameof(RouteViewModel.Route):
{
var graphicsOverlay = MapView.GraphicsOverlays["RouteOverlay"];
// clear existing graphics
graphicsOverlay?.Graphics?.Clear();
if (_routeViewModel.FromPlace == null || _routeViewModel.ToPlace == null ||
_routeViewModel.Route == null || graphicsOverlay == null)
{
return;
}
// Add route to map
var routeGraphic = new Graphic(_routeViewModel.Route.Routes.FirstOrDefault()?.RouteGeometry);
graphicsOverlay?.Graphics.Add(routeGraphic);
// Add start and end locations to the map
var fromGraphic = new Graphic(_routeViewModel.FromPlace.RouteLocation, startMapPin);
var toGraphic = new Graphic(_routeViewModel.ToPlace.RouteLocation, endMapPin);
graphicsOverlay?.Graphics.Add(fromGraphic);
graphicsOverlay?.Graphics.Add(toGraphic);
break;
}
}
};
// start location services - only once MapView.LocationDisplay property is ready
MapView.PropertyChanged += (o, e) =>
{
if (e.PropertyName == nameof(MapView.LocationDisplay) && MapView.LocationDisplay != null)
{
var mapViewModel = Resources["MapViewModel"] as MapViewModel;
MapView.LocationDisplay.DataSource = mapViewModel.LocationDataSource;
MapView.LocationDisplay.AutoPanMode = LocationDisplayAutoPanMode.Recenter;
#if __ANDROID__
MainActivity.Instance.AskForLocationPermission(MapView);
#else
MapView.LocationDisplay.IsEnabled = true;
#endif
}
};
// Change map when user selects a new basemap
_basemapViewModel.PropertyChanged += (s, ea) =>
{
switch (ea.PropertyName)
{
case nameof(BasemapsViewModel.SelectedBasemap):
{
// Set the viewpoint of the new map to be the same as the old map
// Otherwise map is being reset to the world view
var mapViewModel = Resources["MapViewModel"] as MapViewModel;
try
{
var currentViewpoint = MapView.GetCurrentViewpoint(ViewpointType.CenterAndScale);
mapViewModel.Map.Basemap = new Basemap(_basemapViewModel.SelectedBasemap);
}
catch (Exception ex)
{
mapViewModel.ErrorMessage = "Unable to change basemaps";
mapViewModel.StackTrace = ex.ToString();
}
break;
}
}
};
// Change map when user selects a new user item
_userItemsViewModel.PropertyChanged += async(s, ea) =>
{
switch (ea.PropertyName)
{
case nameof(UserItemsViewModel.SelectedUserItem):
{
// Set the viewpoint of the new map to be the same as the old map
// Otherwise map is being reset to the world view
var mapViewModel = Resources["MapViewModel"] as MapViewModel;
var currentViewpoint = MapView.GetCurrentViewpoint(ViewpointType.CenterAndScale);
try
{
var newMap = new Map(_userItemsViewModel.SelectedUserItem)
{
InitialViewpoint = currentViewpoint
};
//Load new map
await newMap.LoadAsync();
mapViewModel.Map = newMap;
}
catch (Exception ex)
{
mapViewModel.ErrorMessage = "Unable to change maps";
mapViewModel.StackTrace = ex.ToString();
}
break;
}
}
};
#if __IOS__
// This is necessary because on iOS the SearchBar doesn't get unfocused automatically when a geocode result is selected
SearchSuggestionsList.ItemSelected += (s, e) =>
{
AddressSearchBar.Unfocus();
};
FromLocationSuggestionsList.ItemSelected += (s, e) =>
{
FromLocationTextBox.Unfocus();
};
ToLocationSuggestionsList.ItemSelected += (s, e) =>
{
ToLocationTextBox.Unfocus();
};
#endif
}
catch (Exception ex)
{
await DisplayAlert("Error", ex.ToString(), "OK");
}
}
