cmd.cs

namespace Nitra.Visualizer.ViewModels
{
  public class AstNodeViewModel : ReactiveObject
  {
    readonly ObjectDescriptor _objectDescriptor;
    readonly NitraClient _client;

    [Reactive]
    public bool                           NeedLoadContent { get; private set; }
    public ReactiveList<AstNodeViewModel> Items           { get; set; }
    
    public IReactiveCommand<IList<AstNodeViewModel>> LoadItems { get; } 

    public AstNodeViewModel(NitraClient client, ObjectDescriptor objectDescriptor)
    {
      _client           = client;
      _objectDescriptor = objectDescriptor;
      Items = new ReactiveList<AstNodeViewModel>();
            
      if (objectDescriptor.IsObject || objectDescriptor.IsSeq && objectDescriptor.Count > 0)
      {
        NeedLoadContent = true;
        Items.Add(null);
      }

      LoadItems = ReactiveCommand.CreateAsyncTask(_ => client.ReceiveItemsAsync());
      LoadItems.Subscribe(loaded => Items.AddRange(loaded));
    }
  }
}