port from perforce

intromat/NodeNetworkToolkit/ValueNode/ValueEditorViewModel.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Reactive;
+using System.Reactive.Linq;
+using NodeNetwork.ViewModels;
+using NodeNetwork.Views;
+using ReactiveUI;
+
+namespace NodeNetwork.Toolkit.ValueNode
+{
+    /// <summary>
+    /// An editor for ValueNodeInputViewModel or ValueNodeOutputViewModel.
+    /// For inputs, this class can provide values when no connection is present.
+    /// For outputs, this class can provide a way to configure the value produced by the output.
+    /// </summary>
+    /// <typeparam name="T"></typeparam>
+    public class ValueEditorViewModel<T> : NodeEndpointEditorViewModel
+    {
+        static ValueEditorViewModel()
+        {
+            NNViewRegistrar.AddRegistration(() => new NodeEndpointEditorView(), typeof(IViewFor<ValueEditorViewModel<T>>));
+        }
+
+        #region Value
+        /// <summary>
+        /// The value currently set in the editor.
+        /// </summary>
+        public T Value
+        {
+            get => _value;
+            set => this.RaiseAndSetIfChanged(ref _value, value);
+        }
+        private T _value;
+        #endregion
+
+        #region ValueChanged
+        /// <summary>
+        /// Observable that produces an object when the value changes.
+        /// </summary>
+        public IObservable<T> ValueChanged { get; } 
+        #endregion
+
+        public ValueEditorViewModel()
+        {
+            ValueChanged = this.WhenAnyValue(vm => vm.Value);
+        }
+    }
+}