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Common/DTS.Common.Utilities/UpdateNotifyingList.cs

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+/*
+ * UpdateNotifyingList.cs
+ * 
+ * Copyright © 2009
+ * Diversified Technical Systems, Inc.
+ * All Rights Reserved
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using DTS.Common.Utilities.DotNetProgrammingConstructs;
+
+namespace DTS.Common.Utilities
+{
+    public class UpdateNotifyingList<T> : Exceptional
+    {
+        /// <summary>
+        /// Initialize an instance of the UpdateNotifyingList class.
+        /// </summary>
+        public UpdateNotifyingList()
+        {
+        }
+
+        /// <summary>
+        /// Get/set the notification-bound items in this list.
+        /// </summary>
+        public List<T> Items
+        {
+            get => _Items.Value;
+            set
+            {
+                try
+                {   //
+                    // Update list items and then notify all subscribers.
+                    //
+                    _Items.Value = value;
+                    OnUpdate(value);
+                }
+                catch (System.Exception ex)
+                {
+                    throw new UpdateNotifyingList<T>.Exception("encountered problem setting UpdateNotifyingList.Items", ex);
+                }
+            }
+        }
+        private Property<List<T>> _Items
+            = new Property<List<T>>("NotifyingList", null, false);
+
+        /// <summary>
+        /// Callback method to be invoked whenever the notifying list is updated.
+        /// </summary>
+        /// 
+        /// <param name="updatedContents">
+        /// The updated contents of the notifying list.
+        /// </param>
+        /// 
+        public delegate void OnUpdateCallback(List<T> updatedContents);
+
+        /// <summary>
+        /// Subscribers to be notified whenever this list is changed.
+        /// </summary>
+        public event OnUpdateCallback OnUpdate;
+    }
+}