Added "CoreTime" Enclosed Entity for Start/Finish/Duration Property Groups

InABox.Core/Classes/CoreTime.cs

@@ -0,0 +1,46 @@
+using System;
+
+namespace InABox.Core
+{
+    public class CoreTime : BaseObject, IEnclosedEntity
+    {
+        [TimeOfDayEditor]
+        [EditorSequence(1)]
+        [LoggableProperty(Format = "HH\\:mm")]
+        public TimeSpan Start { get; set; }
+        
+        [DurationEditor(Summary = Summary.Sum)]
+        [EditorSequence(2)]
+        public TimeSpan Duration { get; set; }
+        
+        [TimeOfDayEditor]
+        [EditorSequence(3)]
+        [LoggableProperty(Format = "HH\\:mm")]
+        public TimeSpan Finish { get; set; }
+
+
+        private bool bChanging = false;
+        
+        protected override void DoPropertyChanged(string name, object before, object after)
+        {
+            base.DoPropertyChanged(name, before, after);
+            
+            if (bChanging)
+                return;
+            bChanging = true;
+            
+            if (String.Equals(name,nameof(Start)))
+                Duration = Finish > (TimeSpan)after ? Finish.Subtract((TimeSpan)after) : new TimeSpan();
+
+            else if (String.Equals(name,nameof(Finish)))
+                Duration = (TimeSpan)after > Start ? ((TimeSpan)after).Subtract(Start) : new TimeSpan();
+            
+            else if (String.Equals(name,nameof(Duration)))
+                Finish = Start.Add((TimeSpan)after);
+            
+            bChanging = false;
+            
+        }
+        
+    }
+}