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using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Windows.Devices.Geolocation;
using Windows.Services.Maps;
#if WINDOWS_UWP
namespace Xamarin.Forms.Maps.UWP
#else
namespace Xamarin.Forms.Maps.WinRT
#endif
{
internal class GeocoderBackend
{
public static void Register()
{
Geocoder.GetPositionsForAddressAsyncFunc = GetPositionsForAddress;
Geocoder.GetAddressesForPositionFuncAsync = GetAddressesForPositionAsync;
}
static string AddressToString(MapAddress address)
{
string building = "", house = "", city = "", country = "";
var bldg = new List<string>();
if (!"".Equals(address.BuildingRoom))
bldg.Add(address.BuildingRoom);
if (!"".Equals(address.BuildingFloor))
bldg.Add(address.BuildingFloor);
if (!"".Equals(address.BuildingName))
bldg.Add(address.BuildingName);
if (!"".Equals(address.BuildingWing))
bldg.Add(address.BuildingWing);
if (bldg.Count > 0)
building = string.Join(" ", bldg) + Environment.NewLine;
var hs = new List<string>();
if (!"".Equals(address.StreetNumber))
hs.Add(address.StreetNumber);
if (!"".Equals(address.Street))
hs.Add(address.Street);
if (hs.Count > 0)
house = string.Join(" ", hs) + Environment.NewLine;
var cs = new List<string>();
if (!"".Equals(address.Town))
cs.Add(address.Town);
if (!"".Equals(address.Neighborhood))
cs.Add(address.Neighborhood);
else if (!"".Equals(address.Region))
cs.Add(address.Region);
if (!"".Equals(address.PostCode))
cs.Add(address.PostCode);
if (cs.Count > 0)
city = string.Join(" ", cs) + Environment.NewLine;
if (!"".Equals(address.Country))
country = address.Country;
return building + house + city + country;
}
static async Task<IEnumerable<string>> GetAddressesForPositionAsync(Position position)
{
var queryResults =
await
MapLocationFinder.FindLocationsAtAsync(
new Geopoint(new BasicGeoposition { Latitude = position.Latitude, Longitude = position.Longitude }));
var addresses = new List<string>();
foreach (var result in queryResults?.Locations)
addresses.Add(AddressToString(result.Address));
return addresses;
}
static async Task<IEnumerable<Position>> GetPositionsForAddress(string address)
{
var queryResults = await MapLocationFinder.FindLocationsAsync(address, null, 10);
var positions = new List<Position>();
foreach (var result in queryResults?.Locations)
positions.Add(new Position(result.Point.Position.Latitude, result.Point.Position.Longitude));
return positions;
}
}
}
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