/// <summary>
/// Updates the listbox with the feature/Symbol list
/// </summary>
/// <returns></returns>
internal Task UpdateSymbolList()
{
if (MapView.Active?.Map == null)
{
return(Task.FromResult(0));
}
return(QueuedTask.Run(() =>
{
var activeMapView = MapView.Active;
if (activeMapView == null)
{
return;
}
var features = activeMapView.Map.GetSelection();
foreach (var kvp in features)
{
if (kvp.Key is FeatureLayer)
{
var lyr = kvp.Key as FeatureLayer;
if (lyr.CanLookupSymbol())
{
var symbol = lyr.LookupSymbol(kvp.Value[0], activeMapView);
lock (_lock)
FeatureItems.Add(new FeatureItem(lyr, kvp.Value[0], symbol));
}
}
}
var defSelectionAction = (Action)(() =>
{
SelectedFeatureItem = FeatureItems.Count > 0 ? FeatureItems[0] : null;
});
ActionOnGuiThread(defSelectionAction);
}));
}
public static void GetSongsByFeature(ObservableCollection <Song> songs, FeatureItems item)
{
var allSongs = GetSongs();
var filteredSongs = allSongs.Where(song => song.Item == item).ToList();
songs.Clear();
filteredSongs.ForEach(song => songs.Add(song)); //lambda expression
}
/// <summary>
/// Event handler when the selected features changes
/// </summary>
/// <param name="obj"></param>
private void OnMapSelectionChangedEvent(MapSelectionChangedEventArgs obj)
{
//Clear the list first
if (FeatureItems?.Count > 0)
{
FeatureItems.Clear();
}
UpdateSymbolList();
}
/// <summary>
/// Event handler when the active MapView changes
/// </summary>
/// <param name="obj"></param>
private void OnActiveMapViewChangedEvent(ActiveMapViewChangedEventArgs obj)
{
if (obj.IncomingView == null)
{
FeatureItems.Clear();
return;
}
//Clear the list first
if (FeatureItems?.Count > 0)
{
FeatureItems.Clear();
}
UpdateSymbolList();
}
