port from perforce

intromat/NodeNetwork/ViewModels/EndpointGroupViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Reactive.Linq;
+using System.Text;
+
+using DynamicData;
+
+using NodeNetwork.Views;
+
+using ReactiveUI;
+
+using Splat;
+
+namespace NodeNetwork.ViewModels
+{
+    public class EndpointGroupViewModel : ReactiveObject
+    {
+        static EndpointGroupViewModel()
+        {
+            NNViewRegistrar.AddRegistration(() => new EndpointGroupView(), typeof(IViewFor<EndpointGroupViewModel>));
+        }
+
+        #region VisibleInputs
+        /// <summary>
+        /// The list of inputs that is currently visible on this group.
+        /// Some inputs may be hidden if the node is collapsed.
+        /// </summary>
+        public IObservableList<NodeInputViewModel> VisibleInputs { get; }
+        #endregion
+
+        #region VisibleOutputs
+        /// <summary>
+        /// The list of outputs that is currently visible on this group.
+        /// Some outputs may be hidden if the node is collapsed.
+        /// </summary>
+        public IObservableList<NodeOutputViewModel> VisibleOutputs { get; }
+        #endregion
+
+        #region Group
+        /// <summary>
+        /// The endpoint group wrapping the name and the parent group of this group.
+        /// </summary>
+        public EndpointGroup Group { get; }
+        #endregion
+
+        #region Children
+        /// <summary>
+        /// The list of nested endpoint groups.
+        /// </summary>
+        public ReadOnlyObservableCollection<EndpointGroupViewModel> Children => _children;
+        private readonly ReadOnlyObservableCollection<EndpointGroupViewModel> _children;
+        #endregion
+
+        public EndpointGroupViewModel(
+            EndpointGroup group, 
+            IObservable<IChangeSet<NodeInputViewModel>> allInputs, 
+            IObservable<IChangeSet<NodeOutputViewModel>> allOutputs, 
+            IObservableCache<Node<EndpointGroup, EndpointGroup>, EndpointGroup> children, 
+            EndpointGroupViewModelFactory endpointGroupViewModelFactory)
+        {
+            Group = group;
+            VisibleInputs = allInputs.Filter(e => e.Group == group).AsObservableList();
+            VisibleOutputs = allOutputs.Filter(e => e.Group == group).AsObservableList();
+            children
+                .Connect()
+                .Transform(n => endpointGroupViewModelFactory(n.Key, allInputs, allOutputs, n.Children, endpointGroupViewModelFactory))
+                .Bind(out _children)
+                .Subscribe();
+        }
+    }
+}