Add observable collections

OpenRA.FileFormats/Primitives/ObservableCollection.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2013 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+
+namespace OpenRA.FileFormats.Primitives
+{
+	public class ObservableCollection<T> : Collection<T>, IObservableCollection
+	{
+		public event Action<object> OnAdd = k => { };
+		public event Action<object> OnRemove = k => { };
+		public event Action<int> OnRemoveAt = i => { };
+		public event Action<object, object> OnSet = (o, n) => { };
+		public event Action OnRefresh = () => { };
+
+		public ObservableCollection() : base() { }
+		public ObservableCollection(IList<T> list) : base(list) { }
+
+		protected override void SetItem(int index, T item)
+		{
+			var old = this[index];
+			base.SetItem(index, item);
+			OnSet(old, item);
+		}
+
+		protected override void InsertItem(int index, T item)
+		{
+			base.InsertItem(index, item);
+			OnAdd(item);
+		}
+
+		protected override void ClearItems()
+		{
+			base.ClearItems();
+			OnRefresh();
+		}
+
+		protected override void RemoveItem(int index)
+		{
+			base.RemoveItem(index);
+			OnRemoveAt(index);
+		}
+
+		public IEnumerable ObservedItems
+		{
+			get { return base.Items; }
+		}
+	}
+}