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Src/Xceed.Wpf.Toolkit/Core/WeakCollectionChangedWrapper.cs

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+/*************************************************************************************
+
+   Extended WPF Toolkit
+
+   Copyright (C) 2007-2013 Xceed Software Inc.
+
+   This program is provided to you under the terms of the Microsoft Public
+   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 
+
+   For more features, controls, and fast professional support,
+   pick up the Plus Edition at http://xceed.com/wpf_toolkit
+
+   Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids
+
+  ***********************************************************************************/
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Collections;
+using System.Collections.Specialized;
+using Xceed.Wpf.Toolkit.Core.Utilities;
+
+namespace Xceed.Wpf.Toolkit.Core
+{
+  internal class WeakCollectionChangedWrapper : IList, ICollection, INotifyCollectionChanged
+  {
+    private WeakEventListener<NotifyCollectionChangedEventArgs> _innerListListener;
+    private IList _innerList;
+
+    public WeakCollectionChangedWrapper( IList sourceList )
+    {
+      _innerList = sourceList;
+      var notifyList = _innerList as INotifyCollectionChanged;
+      if( notifyList != null )
+      {
+        _innerListListener = new WeakEventListener<NotifyCollectionChangedEventArgs>( OnInnerCollectionChanged );
+        CollectionChangedEventManager.AddListener( notifyList, _innerListListener );
+      }
+    }
+
+    public event NotifyCollectionChangedEventHandler CollectionChanged;
+
+    private void OnInnerCollectionChanged( object sender, NotifyCollectionChangedEventArgs args )
+    {
+      if( this.CollectionChanged != null )
+      {
+        this.CollectionChanged( this, args );
+      }
+    }
+
+    internal void ReleaseEvents()
+    {
+      if( _innerListListener != null )
+      {
+        CollectionChangedEventManager.RemoveListener( ( INotifyCollectionChanged )_innerList, _innerListListener );
+        _innerListListener = null;
+      }
+    }
+
+    #region IList Members
+
+    int IList.Add( object value )
+    {
+      return _innerList.Add( value );
+    }
+
+    void IList.Clear()
+    {
+      _innerList.Clear();
+    }
+
+    bool IList.Contains( object value )
+    {
+      return _innerList.Contains( value );
+    }
+
+    int IList.IndexOf( object value )
+    {
+      return _innerList.IndexOf( value );
+    }
+
+    void IList.Insert( int index, object value )
+    {
+      _innerList.Insert( index, value );
+    }
+
+    bool IList.IsFixedSize
+    {
+      get { return _innerList.IsFixedSize; }
+    }
+
+    bool IList.IsReadOnly
+    {
+      get { return _innerList.IsReadOnly; }
+    }
+
+    void IList.Remove( object value )
+    {
+      _innerList.Remove( value );
+    }
+
+    void IList.RemoveAt( int index )
+    {
+      _innerList.RemoveAt( index );
+    }
+
+    object IList.this[ int index ]
+    {
+      get { return _innerList[ index ]; }
+      set { _innerList[ index ] = value; }
+    }
+    #endregion
+
+    #region ICollection Members
+
+    void ICollection.CopyTo( Array array, int index )
+    {
+      _innerList.CopyTo( array, index );
+    }
+
+    int ICollection.Count
+    {
+      get { return _innerList.Count; }
+    }
+
+    bool ICollection.IsSynchronized
+    {
+      get { return _innerList.IsSynchronized; }
+    }
+
+    object ICollection.SyncRoot
+    {
+      get { return _innerList.SyncRoot; }
+    }
+
+    #endregion
+
+    #region IEnumerable Members
+
+    IEnumerator IEnumerable.GetEnumerator()
+    {
+      return _innerList.GetEnumerator();
+    }
+
+    #endregion
+
+  }
+}