private List <MarkerListViewItem> GetMarkersWithDistances(List <Marker> markersList)
{
List <MarkerListViewItem> list = new List <MarkerListViewItem>();
foreach (Marker marker in markersList)
{
var item = new MarkerListViewItem()
{
Marker = marker
};
if (_currentLat != null && _currentLong != null)
{
/*
* // Adapted from https://forums.xamarin.com/discussion/comment/34987/#Comment_34987
* double d = Math.Acos(
* (Math.Sin((double)_currentLat) * Math.Sin(marker.Latitude)) +
* (Math.Cos((double)_currentLat) * Math.Cos(marker.Latitude))
* Math.Cos(marker.Longitude - (double)_currentLong));
*
* // in meters
* //item.DistanceAway = (6378137 * d).ToString();
* // in miles
* item.DistanceAway = (3959 * d).ToString();
*/
Double distInMeters = DistanceHelper.DistanceInMetres((double)_currentLat, (double)_currentLong, marker.Latitude, marker.Longitude);
Decimal distInMiles = (Decimal)(distInMeters * 0.000621371);
Decimal distRounded = Decimal.Round(distInMiles, 1);
item.DistanceAway = distRounded.ToString() + " mi";
item.DistanceAwayDecimal = distRounded;
}
else
{
item.DistanceAway = "Unknown";
item.DistanceAwayDecimal = 0;
}
list.Add(item);
}
return(list);
}
async void ShowMarkersList()
{
_markersList = await _markerService.GetAllMarkers();
List <MarkerListViewItem> markersWithDistances = GetMarkersWithDistances(_markersList);
// Create the ListView.
_listView = new ListView
{
// Source of data items.
ItemsSource = markersWithDistances,
// Define template for displaying each item.
// (Argument of DataTemplate constructor is called for
// each item; it must return a Cell derivative.)
ItemTemplate = new DataTemplate(() =>
{
// Create views with bindings for displaying each property.
Label nameLabel = new Label();
nameLabel.SetBinding(Label.TextProperty, "Marker.Title");
Label nodeIdLabel = new Label();
nodeIdLabel.SetBinding(Label.TextProperty, "DistanceAway");
/*nodeIdLabel.SetBinding(Label.TextProperty,
* new Binding("DistanceAway", BindingMode.OneWay,
* null, null, "Distance: {0}"));
*/
// Return an assembled ViewCell.
return(new ViewCell
{
View = new StackLayout
{
Padding = new Thickness(0, 5),
Orientation = StackOrientation.Horizontal,
Children =
{
new StackLayout
{
VerticalOptions = LayoutOptions.Center,
Spacing = 0,
Children =
{
nameLabel,
nodeIdLabel
}
}
}
}
});
})
};
_listView.ItemTapped += async(sender, args) =>
{
MarkerListViewItem marker = args.Item as MarkerListViewItem;
if (marker == null)
{
return;
}
// TODO: Show marker detail screen
//ShowMarkerLocation(marker.Title, "/?q=mobileapi/node/" + marker.NodeId);
await Navigation.PushAsync(new MarkerInfoPage(marker.Marker));
_listView.SelectedItem = null;
};
ContentGrid.Children.Add(_listView);
}
