async Task ExecuteLoadSuppliersCommand()
{
if (IsBusy)
{
return;
}
IsBusy = true;
try
{
Geocoder geoCoder = new Geocoder();
Suppliers.Clear();
SupplierPins.Clear();
var suppliers = await SupplierDataStore.GetItemsAsync(true);
foreach (var supplier in suppliers)
{
if (supplier.Latitude == 0 && supplier.Longitude == 0)
{
var approximateLocations = await geoCoder.GetPositionsForAddressAsync(supplier.Address);
foreach (var position in approximateLocations)
{
supplier.Latitude = position.Latitude;
supplier.Longitude = position.Longitude;
break;
}
}
var distance = Distance(UserPosition.Latitude, UserPosition.Longitude, supplier.Latitude, supplier.Longitude, 'K');
if (distance <= MapRadius)
{
Suppliers.Add(supplier);
SupplierPins.Add(new CustomPin
{
Type = PinType.Place,
Position = new Position(supplier.Latitude, supplier.Longitude),
Label = supplier.Name,
Address = supplier.Address,
Color = Color.Red,
Opacity = 100
});
}
}
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
finally
{
IsBusy = false;
}
}
public SuppliersViewModel()
{
Title = "Suppliers";
Suppliers = new ObservableCollection <Supplier>();
SupplierPins = new ObservableCollection <CustomPin>();
LoadSuppliersCommand = new Command(async() => await ExecuteLoadSuppliersCommand());
MessagingCenter.Subscribe <Homepage, Supplier>(this, "AddSupplier", async(obj, supplier) =>
{
var _supplier = supplier as Supplier;
Suppliers.Add(_supplier);
await SupplierDataStore.AddItemAsync(_supplier);
});
}