Added an ObservableList class which is like the ObservableCollection, but allows indexed access

git-svn-id: file:///srv/devel/repo-conversion/nusu@220 d2e56fa2-650e-0410-a79f-9358c0239efd

Nuclex.Support (net-4.0).csproj

@@ -101,6 +101,10 @@
     <Compile Include="Source\Collections\ObservableDictionary.Test.cs">
       <DependentUpon>ObservableDictionary.cs</DependentUpon>
     </Compile>
+    <Compile Include="Source\Collections\ObservableList.cs" />
+    <Compile Include="Source\Collections\ObservableList.Test.cs">
+      <DependentUpon>ObservableList.cs</DependentUpon>
+    </Compile>
     <Compile Include="Source\Collections\PairPriorityQueue.cs" />
     <Compile Include="Source\Collections\PairPriorityQueue.Test.cs">
       <DependentUpon>PairPriorityQueue.cs</DependentUpon>

Nuclex.Support (xna-4.0-phone7).csproj

@@ -132,6 +132,10 @@
     <Compile Include="Source\Collections\ObservableDictionary.Test.cs">
       <DependentUpon>ObservableDictionary.cs</DependentUpon>
     </Compile>
+    <Compile Include="Source\Collections\ObservableList.cs" />
+    <Compile Include="Source\Collections\ObservableList.Test.cs">
+      <DependentUpon>ObservableList.cs</DependentUpon>
+    </Compile>
     <Compile Include="Source\Collections\PairPriorityQueue.cs" />
     <Compile Include="Source\Collections\PairPriorityQueue.Test.cs">
       <DependentUpon>PairPriorityQueue.cs</DependentUpon>

Nuclex.Support (xna-4.0-xbox360).csproj

@@ -143,6 +143,10 @@
     <Compile Include="Source\Collections\ObservableDictionary.Test.cs">
       <DependentUpon>ObservableDictionary.cs</DependentUpon>
     </Compile>
+    <Compile Include="Source\Collections\ObservableList.cs" />
+    <Compile Include="Source\Collections\ObservableList.Test.cs">
+      <DependentUpon>ObservableList.cs</DependentUpon>
+    </Compile>
     <Compile Include="Source\Collections\PairPriorityQueue.cs" />
     <Compile Include="Source\Collections\PairPriorityQueue.Test.cs">
       <DependentUpon>PairPriorityQueue.cs</DependentUpon>

Source/Collections/ObservableCollection.Test.cs

@@ -141,12 +141,12 @@ namespace Nuclex.Support.Collections {
       this.mockery.VerifyAllExpectationsHaveBeenMet();
     }
 
-    /// <summary>Tests whether the ItemRemoved event is fired</summary>
+    /// <summary>Tests whether a the list constructor is working</summary>
     [Test]
     public void TestListConstructor() {
       int[] integers = new int[] { 12, 34, 56, 78 };
 
-      ObservableCollection<int> testCollection = new ObservableCollection<int>(integers);
+      var testCollection = new ObservableCollection<int>(integers);
 
       CollectionAssert.AreEqual(integers, testCollection);
     }

Source/Collections/ObservableCollection.cs

@@ -86,7 +86,7 @@ namespace Nuclex.Support.Collections {
     protected virtual void OnCollectionChanged(
       NotifyCollectionChangedAction action, TItem item, int index
     ) {
-      if (CollectionChanged != null) {
+      if(CollectionChanged != null) {
         CollectionChanged(
           this, new NotifyCollectionChangedEventArgs(action, item, index)
          );
@@ -141,30 +141,29 @@ namespace Nuclex.Support.Collections {
     /// <summary>Fires the 'ItemAdded' event</summary>
     /// <param name="item">Item that has been added to the collection</param>
     protected virtual void OnAdded(TItem item) {
-      if (ItemAdded != null)
+      if(ItemAdded != null)
         ItemAdded(this, new ItemEventArgs<TItem>(item));
     }
 
     /// <summary>Fires the 'ItemRemoved' event</summary>
     /// <param name="item">Item that has been removed from the collection</param>
     protected virtual void OnRemoved(TItem item) {
-      if (ItemRemoved != null)
+      if(ItemRemoved != null)
         ItemRemoved(this, new ItemEventArgs<TItem>(item));
     }
 
     /// <summary>Fires the 'Clearing' event</summary>
     protected virtual void OnClearing() {
-      if (Clearing != null)
+      if(Clearing != null)
         Clearing(this, EventArgs.Empty);
     }
 
     /// <summary>Fires the 'Cleared' event</summary>
     protected virtual void OnCleared() {
-      if (Cleared != null)
+      if(Cleared != null)
         Cleared(this, EventArgs.Empty);
     }
 
-
   }
 
 } // namespace Nuclex.Support.Collections

Source/Collections/ObservableDictionary.cs

@@ -242,6 +242,7 @@ namespace Nuclex.Support.Collections {
     protected virtual void OnAdded(KeyValuePair<TKey, TValue> item) {
       if(ItemAdded != null)
         ItemAdded(this, new ItemEventArgs<KeyValuePair<TKey, TValue>>(item));
+
 #if !NO_SPECIALIZED_COLLECTIONS
       if(CollectionChanged != null)
         CollectionChanged(
@@ -257,6 +258,7 @@ namespace Nuclex.Support.Collections {
     protected virtual void OnRemoved(KeyValuePair<TKey, TValue> item) {
       if(ItemRemoved != null)
         ItemRemoved(this, new ItemEventArgs<KeyValuePair<TKey, TValue>>(item));
+
 #if !NO_SPECIALIZED_COLLECTIONS
       if(CollectionChanged != null)
         CollectionChanged(
@@ -277,6 +279,7 @@ namespace Nuclex.Support.Collections {
     protected virtual void OnCleared() {
       if(Cleared != null)
         Cleared(this, EventArgs.Empty);
+
 #if !NO_SPECIALIZED_COLLECTIONS
       if(CollectionChanged != null)
         CollectionChanged(this, CollectionResetEventArgs);

Source/Collections/ObservableList.Test.cs

@@ -0,0 +1,165 @@
+#region CPL License
+/*
+Nuclex Framework
+Copyright (C) 2002-2010 Nuclex Development Labs
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the IBM Common Public License as
+published by the IBM Corporation; either version 1.0 of the
+License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+IBM Common Public License for more details.
+
+You should have received a copy of the IBM Common Public
+License along with this library
+*/
+#endregion
+
+using System;
+using System.Collections.Generic;
+
+#if UNITTEST
+
+using NUnit.Framework;
+using NMock;
+
+namespace Nuclex.Support.Collections {
+
+  /// <summary>Unit Test for the observable list class</summary>
+  [TestFixture]
+  public class ObservableListTest {
+
+    #region interface IObservableCollectionSubscriber
+
+    /// <summary>Interface used to test the observable collection</summary>
+    public interface IObservableCollectionSubscriber {
+
+      /// <summary>Called when the collection is about to clear its contents</summary>
+      /// <param name="sender">Collection that is clearing its contents</param>
+      /// <param name="arguments">Not used</param>
+      void Clearing(object sender, EventArgs arguments);
+
+      /// <summary>Called when the collection has been cleared of its contents</summary>
+      /// <param name="sender">Collection that was cleared of its contents</param>
+      /// <param name="arguments">Not used</param>
+      void Cleared(object sender, EventArgs arguments);
+
+      /// <summary>Called when an item is added to the collection</summary>
+      /// <param name="sender">Collection to which an item is being added</param>
+      /// <param name="arguments">Contains the item that is being added</param>
+      void ItemAdded(object sender, ItemEventArgs<int> arguments);
+
+      /// <summary>Called when an item is removed from the collection</summary>
+      /// <param name="sender">Collection from which an item is being removed</param>
+      /// <param name="arguments">Contains the item that is being removed</param>
+      void ItemRemoved(object sender, ItemEventArgs<int> arguments);
+
+    }
+
+    #endregion // interface IObservableCollectionSubscriber
+
+    /// <summary>Initialization routine executed before each test is run</summary>
+    [SetUp]
+    public void Setup() {
+      this.mockery = new MockFactory();
+
+      this.mockedSubscriber = this.mockery.CreateMock<IObservableCollectionSubscriber>();
+
+      this.observedList = new ObservableList<int>();
+      this.observedList.Clearing += new EventHandler(
+        this.mockedSubscriber.MockObject.Clearing
+      );
+      this.observedList.Cleared += new EventHandler(
+        this.mockedSubscriber.MockObject.Cleared
+      );
+      this.observedList.ItemAdded += new EventHandler<ItemEventArgs<int>>(
+        this.mockedSubscriber.MockObject.ItemAdded
+      );
+      this.observedList.ItemRemoved += new EventHandler<ItemEventArgs<int>>(
+        this.mockedSubscriber.MockObject.ItemRemoved
+      );
+    }
+
+    /// <summary>Tests whether the Clearing event is fired</summary>
+    [Test]
+    public void TestClearingEvent() {
+      this.mockedSubscriber.Expects.One.Method(m => m.Clearing(null, null)).WithAnyArguments();
+      this.mockedSubscriber.Expects.One.Method(m => m.Cleared(null, null)).WithAnyArguments();
+      this.observedList.Clear();
+
+      this.mockery.VerifyAllExpectationsHaveBeenMet();
+    }
+
+    /// <summary>Tests whether the ItemAdded event is fired</summary>
+    [Test]
+    public void TestItemAddedEvent() {
+      this.mockedSubscriber.Expects.One.Method(m => m.ItemAdded(null, null)).WithAnyArguments();
+
+      this.observedList.Add(123);
+
+      this.mockery.VerifyAllExpectationsHaveBeenMet();
+    }
+
+    /// <summary>Tests whether the ItemRemoved event is fired</summary>
+    [Test]
+    public void TestItemRemovedEvent() {
+      this.mockedSubscriber.Expects.One.Method(m => m.ItemAdded(null, null)).WithAnyArguments();
+
+      this.observedList.Add(123);
+
+      this.mockedSubscriber.Expects.One.Method(m => m.ItemRemoved(null, null)).WithAnyArguments();
+
+      this.observedList.Remove(123);
+
+      this.mockery.VerifyAllExpectationsHaveBeenMet();
+    }
+
+    /// <summary>Tests whether items in the collection can be replaced</summary>
+    [Test]
+    public void TestItemReplacement() {
+      this.mockedSubscriber.Expects.Exactly(3).Method(
+        m => m.ItemAdded(null, null)
+      ).WithAnyArguments();
+
+      this.observedList.Add(1);
+      this.observedList.Add(2);
+      this.observedList.Add(3);
+
+      this.mockedSubscriber.Expects.One.Method(m => m.ItemRemoved(null, null)).WithAnyArguments();
+      this.mockedSubscriber.Expects.One.Method(m => m.ItemAdded(null, null)).WithAnyArguments();
+
+      // Replace the middle item with something else
+      this.observedList[1] = 4;
+
+      Assert.AreEqual(
+        1, this.observedList.IndexOf(4)
+      );
+
+      this.mockery.VerifyAllExpectationsHaveBeenMet();
+    }
+
+    /// <summary>Tests whether a the list constructor is working</summary>
+    [Test]
+    public void TestListConstructor() {
+      int[] integers = new int[] { 12, 34, 56, 78 };
+
+      var testList = new ObservableList<int>(integers);
+
+      CollectionAssert.AreEqual(integers, testList);
+    }
+
+    /// <summary>Mock object factory</summary>
+    private MockFactory mockery;
+    /// <summary>The mocked observable collection subscriber</summary>
+    private Mock<IObservableCollectionSubscriber> mockedSubscriber;
+    /// <summary>An observable collection to which a mock will be subscribed</summary>
+    private ObservableList<int> observedList;
+
+  }
+
+} // namespace Nuclex.Support.Collections
+
+#endif // UNITTEST

Source/Collections/ObservableList.cs

@@ -0,0 +1,374 @@
+#region CPL License
+/*
+Nuclex Framework
+Copyright (C) 2002-2010 Nuclex Development Labs
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the IBM Common Public License as
+published by the IBM Corporation; either version 1.0 of the
+License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+IBM Common Public License for more details.
+
+You should have received a copy of the IBM Common Public
+License along with this library
+*/
+#endregion
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+#if !NO_SPECIALIZED_COLLECTIONS
+using System.Collections.Specialized;
+#endif
+
+namespace Nuclex.Support.Collections {
+
+  /// <summary>List which fires events when items are added or removed</summary>
+  /// <typeparam name="TItem">Type of items the collection manages</typeparam>
+  public class ObservableList<TItem> : IList<TItem>, IList, ICollection,
+#if !NO_SPECIALIZED_COLLECTIONS
+    INotifyCollectionChanged,
+#endif
+    IObservableCollection<TItem> {
+
+    /// <summary>Raised when an item has been added to the collection</summary>
+    public event EventHandler<ItemEventArgs<TItem>> ItemAdded;
+    /// <summary>Raised when an item is removed from the collection</summary>
+    public event EventHandler<ItemEventArgs<TItem>> ItemRemoved;
+    /// <summary>Raised when the collection is about to be cleared</summary>
+    /// <remarks>
+    ///   This could be covered by calling ItemRemoved for each item currently
+    ///   contained in the collection, but it is often simpler and more efficient
+    ///   to process the clearing of the entire collection as a special operation.
+    /// </remarks>
+    public event EventHandler Clearing;
+    /// <summary>Raised when the collection has been cleared</summary>
+    public event EventHandler Cleared;
+
+#if !NO_SPECIALIZED_COLLECTIONS
+    /// <summary>Called when the collection has changed</summary>
+    public event NotifyCollectionChangedEventHandler CollectionChanged;
+#endif
+
+    /// <summary>
+    ///   Initializes a new instance of the ObservableList class that is empty.
+    /// </summary>
+    public ObservableList() : this(new List<TItem>()) { }
+
+    /// <summary>
+    ///   Initializes a new instance of the ObservableList class as a wrapper
+    ///   for the specified list.
+    /// </summary>
+    /// <param name="list">The list that is wrapped by the new collection.</param>
+    /// <exception cref="System.ArgumentNullException">List is null</exception>
+    public ObservableList(IList<TItem> list) {
+      this.typedList = list;
+      this.objectList = list as IList; // Gah!
+    }
+
+    /// <summary>Determines the index of the specified item in the list</summary>
+    /// <param name="item">Item whose index will be determined</param>
+    /// <returns>The index of the item in the list or -1 if not found</returns>
+    public int IndexOf(TItem item) {
+      return this.typedList.IndexOf(item);
+    }
+
+    /// <summary>Inserts an item into the list at the specified index</summary>
+    /// <param name="index">Index the item will be insertted at</param>
+    /// <param name="item">Item that will be inserted into the list</param>
+    public void Insert(int index, TItem item) {
+      this.typedList.Insert(index, item);
+      OnAdded(item);
+#if !NO_SPECIALIZED_COLLECTIONS
+      OnCollectionChanged(NotifyCollectionChangedAction.Add, item, index);
+#endif
+    }
+
+    /// <summary>Removes the item at the specified index from the list</summary>
+    /// <param name="index">Index at which the item will be removed</param>
+    public void RemoveAt(int index) {
+      TItem item = this.typedList[index];
+      this.typedList.RemoveAt(index);
+      OnRemoved(item);
+#if !NO_SPECIALIZED_COLLECTIONS
+      OnCollectionChanged(NotifyCollectionChangedAction.Remove, item, index);
+#endif
+    }
+
+    /// <summary>Accesses the item at the specified index in the list</summary>
+    /// <param name="index">Index of the item that will be accessed</param>
+    /// <returns>The item at the specified index</returns>
+    public TItem this[int index] {
+      get { return this.typedList[index]; }
+      set {
+        TItem oldItem = this.typedList[index];
+        this.typedList[index] = value;
+        OnRemoved(oldItem);
+        OnAdded(value);
+#if !NO_SPECIALIZED_COLLECTIONS
+        if(CollectionChanged != null) {
+          CollectionChanged(
+            this, new NotifyCollectionChangedEventArgs(
+              NotifyCollectionChangedAction.Replace, value, oldItem, index
+            )
+          );
+        }
+#endif
+
+      }
+    }
+
+    /// <summary>Adds an item to the end of the list</summary>
+    /// <param name="item">Item that will be added to the list</param>
+    public void Add(TItem item) {
+      this.typedList.Add(item);
+      OnAdded(item);
+    }
+
+    /// <summary>Removes all items from the list</summary>
+    public void Clear() {
+      OnClearing();
+      this.typedList.Clear();
+      OnCleared();
+#if !NO_SPECIALIZED_COLLECTIONS
+      if(CollectionChanged != null) {
+        CollectionChanged(this, CollectionResetEventArgs);
+      }
+#endif
+    }
+
+    /// <summary>Checks whether the list contains the specified item</summary>
+    /// <param name="item">Item the list will be checked for</param>
+    /// <returns>True if the list contains the specified items</returns>
+    public bool Contains(TItem item) {
+      return this.typedList.Contains(item);
+    }
+
+    /// <summary>Copies the contents of the list into an array</summary>
+    /// <param name="array">Array the list will be copied into</param>
+    /// <param name="arrayIndex">
+    ///   Index in the target array where the first item will be copied to
+    /// </param>
+    public void CopyTo(TItem[] array, int arrayIndex) {
+      this.typedList.CopyTo(array, arrayIndex);
+    }
+
+    /// <summary>Total number of items in the list</summary>
+    public int Count {
+      get { return this.typedList.Count; }
+    }
+
+    /// <summary>Whether the list is a read-only list</summary>
+    public bool IsReadOnly {
+      get { return this.typedList.IsReadOnly; }
+    }
+
+    /// <summary>Removes the specified item from the list</summary>
+    /// <param name="item">Item that will be removed from the list</param>
+    /// <returns>
+    ///   True if the item was found and removed from the list, false otherwise
+    /// </returns>
+    public bool Remove(TItem item) {
+      int index = this.typedList.IndexOf(item);
+      if(index == -1) {
+        return false;
+      }
+
+      TItem removedItem = this.typedList[index];
+      this.typedList.RemoveAt(index);
+      OnRemoved(removedItem);
+#if !NO_SPECIALIZED_COLLECTIONS
+      OnCollectionChanged(NotifyCollectionChangedAction.Remove, item, index);
+#endif
+      return true;
+    }
+
+    /// <summary>Returns an enumerator for the items in the list</summary>
+    /// <returns>An enumerator for the list's items</returns>
+    public IEnumerator<TItem> GetEnumerator() {
+      return this.typedList.GetEnumerator();
+    }
+
+    #region IEnumerable implementation
+
+    /// <summary>Returns an enumerator for the items in the list</summary>
+    /// <returns>An enumerator for the list's items</returns>
+    IEnumerator IEnumerable.GetEnumerator() {
+      return this.objectList.GetEnumerator();
+    }
+
+    #endregion // IEnumerable implementation
+
+    #region ICollection implementation
+
+    /// <summary>Copies the contents of the list into an array</summary>
+    /// <param name="array">Array the list will be copied into</param>
+    /// <param name="arrayIndex">
+    ///   Index in the target array where the first item will be copied to
+    /// </param>
+    void ICollection.CopyTo(Array array, int arrayIndex) {
+      this.objectList.CopyTo(array, arrayIndex);
+    }
+
+    /// <summary>Whether this list performs thread synchronization</summary>
+    bool ICollection.IsSynchronized {
+      get { return this.objectList.IsSynchronized; }
+    }
+
+    /// <summary>Synchronization root used by the list to synchronize threads</summary>
+    object ICollection.SyncRoot {
+      get { return this.objectList.SyncRoot; }
+    }
+
+    #endregion // ICollection implementation
+
+    #region IList implementation
+
+    /// <summary>Adds an item to the list</summary>
+    /// <param name="value">Item that will be added to the list</param>
+    /// <returns>
+    ///   The position at which the item has been inserted or -1 if the item was not inserted
+    /// </returns>
+    int IList.Add(object value) {
+      int index = this.objectList.Add(value);
+      TItem addedItem = this.typedList[index];
+      OnAdded(addedItem);
+#if !NO_SPECIALIZED_COLLECTIONS
+      OnCollectionChanged(NotifyCollectionChangedAction.Add, addedItem, index);
+#endif
+      return index;
+    }
+
+    /// <summary>Checks whether the list contains the specified item</summary>
+    /// <param name="item">Item the list will be checked for</param>
+    /// <returns>True if the list contains the specified items</returns>
+    bool IList.Contains(object item) {
+      return this.objectList.Contains(item);
+    }
+
+    /// <summary>Determines the index of the specified item in the list</summary>
+    /// <param name="item">Item whose index will be determined</param>
+    /// <returns>The index of the item in the list or -1 if not found</returns>
+    int IList.IndexOf(object item) {
+      return this.objectList.IndexOf(item);
+    }
+
+    /// <summary>Inserts an item into the list at the specified index</summary>
+    /// <param name="index">Index the item will be insertted at</param>
+    /// <param name="item">Item that will be inserted into the list</param>
+    void IList.Insert(int index, object item) {
+      this.objectList.Insert(index, item);
+      TItem addedItem = this.typedList[index];
+      OnAdded(addedItem);
+#if !NO_SPECIALIZED_COLLECTIONS
+      OnCollectionChanged(NotifyCollectionChangedAction.Add, addedItem, index);
+#endif
+    }
+
+    /// <summary>Whether the list is of a fixed size</summary>
+    bool IList.IsFixedSize {
+      get { return this.objectList.IsFixedSize; }
+    }
+
+    /// <summary>Removes the specified item from the list</summary>
+    /// <param name="item">Item that will be removed from the list</param>
+    void IList.Remove(object item) {
+      int index = this.objectList.IndexOf(item);
+      if(index == -1) {
+        return;
+      }
+
+      TItem removedItem = this.typedList[index];
+      this.objectList.RemoveAt(index);
+      OnRemoved(removedItem);
+#if !NO_SPECIALIZED_COLLECTIONS
+      OnCollectionChanged(NotifyCollectionChangedAction.Remove, removedItem, index);
+#endif
+    }
+
+    /// <summary>Accesses the item at the specified index in the list</summary>
+    /// <param name="index">Index of the item that will be accessed</param>
+    /// <returns>The item at the specified index</returns>
+    object IList.this[int index] {
+      get { return this.objectList[index]; }
+      set {
+        TItem oldItem = this.typedList[index];
+        this.objectList[index] = value;
+        TItem newItem = this.typedList[index];
+        OnRemoved(oldItem);
+        OnAdded(newItem);
+#if !NO_SPECIALIZED_COLLECTIONS
+        if(CollectionChanged != null) {
+          CollectionChanged(
+            this, new NotifyCollectionChangedEventArgs(
+              NotifyCollectionChangedAction.Replace, newItem, oldItem, index
+            )
+          );
+        }
+#endif
+      }
+    }
+
+    #endregion // IList implementation
+
+#if !NO_SPECIALIZED_COLLECTIONS
+    /// <summary>Fires the CollectionChanged event</summary>
+    /// <param name="action">Type of change that has occured</param>
+    /// <param name="item">The item that has been added, removed or replaced</param>
+    /// <param name="index">Index of the changed item</param>
+    protected virtual void OnCollectionChanged(
+      NotifyCollectionChangedAction action, TItem item, int index
+    ) {
+      if(CollectionChanged != null) {
+        CollectionChanged(
+          this, new NotifyCollectionChangedEventArgs(action, item, index)
+        );
+      }
+    }
+#endif
+
+    /// <summary>Fires the 'ItemAdded' event</summary>
+    /// <param name="item">Item that has been added to the collection</param>
+    protected virtual void OnAdded(TItem item) {
+      if(ItemAdded != null)
+        ItemAdded(this, new ItemEventArgs<TItem>(item));
+    }
+
+    /// <summary>Fires the 'ItemRemoved' event</summary>
+    /// <param name="item">Item that has been removed from the collection</param>
+    protected virtual void OnRemoved(TItem item) {
+      if(ItemRemoved != null)
+        ItemRemoved(this, new ItemEventArgs<TItem>(item));
+    }
+
+    /// <summary>Fires the 'Clearing' event</summary>
+    protected virtual void OnClearing() {
+      if(Clearing != null)
+        Clearing(this, EventArgs.Empty);
+    }
+
+    /// <summary>Fires the 'Cleared' event</summary>
+    protected virtual void OnCleared() {
+      if(Cleared != null)
+        Cleared(this, EventArgs.Empty);
+    }
+
+#if !NO_SPECIALIZED_COLLECTIONS
+    /// <summary>Fixed event args used to notify that the collection has reset</summary>
+    private static readonly NotifyCollectionChangedEventArgs CollectionResetEventArgs =
+      new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset);
+#endif
+
+    /// <summary>The wrapped List under its type-safe interface</summary>
+    private IList<TItem> typedList;
+    /// <summary>The wrapped List under its object interface</summary>
+    private IList objectList;
+
+  }
+
+} // namespace Nuclex.Support.Collections