port from perforce

hgplus/bliss/Tweaky/ObservableCollectionEx.cs

@@ -0,0 +1,66 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+
+namespace Tweaky
+{
+    public class ObservableCollectionEx<T> : ObservableCollection<T>
+    {
+        public virtual void NotifyCollectionChanged()
+        {
+            this.OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
+        }
+
+        protected bool preventCollectionChangedEvents = false;
+		protected override void OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
+		{
+            if (!preventCollectionChangedEvents)
+                base.OnCollectionChanged(e);
+		}
+
+		public void AddRange(IEnumerable<T> range)
+		{
+			foreach (var item in range)
+				base.Add(item);
+		}
+
+        public void Replace(IEnumerable<T> range, bool useResetEvent = true)
+        {
+            preventCollectionChangedEvents = true;
+
+            List<T> oldItems = null;
+            List<T> newItems = null;
+
+            if (!useResetEvent)
+            {
+                oldItems = this.Except(range).ToList();
+                newItems = range.Except(this).ToList();
+            }
+
+            base.Clear();
+            foreach (var item in range)
+                base.Add(item);
+
+            preventCollectionChangedEvents = false;
+
+            if (useResetEvent)
+            {
+                OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
+            }
+            else
+            {
+                foreach (var oldItem in oldItems)
+                    OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, oldItem));
+                foreach (var newItem in newItems)
+                    OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, newItem));
+            }
+        }
+
+        public void RemoveAll(IEnumerable<T> range)
+        {
+            foreach (var item in range)
+                base.Remove(item);
+        }
+    }
+}