INotifyCollectionChangedSynchronizedViewList -> NotifyCollectionChangedSynchronizedViewList

sandbox/ConsoleApp/Program.cs

@@ -17,7 +17,7 @@ var list = new ObservableList<Person>()
 var view = list.CreateWritableView(x => x.Name);
 view.AttachFilter(x => x.Age >= 20);
 
-IList<string?> bindable = view.ToWritableNotifyCollectionChanged((string? newView, Person original, ref bool setValue) =>
+var bindable = view.ToWritableNotifyCollectionChanged((string? newView, Person original, ref bool setValue) =>
 {
     if (setValue)
     {

src/ObservableCollections/IObservableCollection.cs

@@ -47,8 +47,8 @@ namespace ObservableCollections
         void AttachFilter(ISynchronizedViewFilter<T> filter);
         void ResetFilter();
         ISynchronizedViewList<TView> ToViewList();
-        INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged();
+        NotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged();
-        INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher);
+        NotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher);
     }
 
     public interface IWritableSynchronizedView<T, TView> : ISynchronizedView<T, TView>
@@ -58,9 +58,9 @@ namespace ObservableCollections
         void SetToSourceCollection(int index, T value);
         void AddToSourceCollection(T value);
         IWritableSynchronizedViewList<TView> ToWritableViewList(WritableViewChangedEventHandler<T, TView> converter);
-        INotifyCollectionChangedSynchronizedViewList<TView> ToWritableNotifyCollectionChanged(WritableViewChangedEventHandler<T, TView> converter);
+        NotifyCollectionChangedSynchronizedViewList<TView> ToWritableNotifyCollectionChanged(WritableViewChangedEventHandler<T, TView> converter);
-        INotifyCollectionChangedSynchronizedViewList<TView> ToWritableNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher);
+        NotifyCollectionChangedSynchronizedViewList<TView> ToWritableNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher);
-        INotifyCollectionChangedSynchronizedViewList<TView> ToWritableNotifyCollectionChanged(WritableViewChangedEventHandler<T, TView> converter, ICollectionEventDispatcher? collectionEventDispatcher);
+        NotifyCollectionChangedSynchronizedViewList<TView> ToWritableNotifyCollectionChanged(WritableViewChangedEventHandler<T, TView> converter, ICollectionEventDispatcher? collectionEventDispatcher);
     }
 
     public interface ISynchronizedViewList<out TView> : IReadOnlyList<TView>, IDisposable
@@ -72,10 +72,97 @@ namespace ObservableCollections
         new TView this[int index] { get; set; }
     }
 
+    // only for compatibility, use NotifyCollectionChangedSynchronizedViewList insetad.
+    // [Obsolete] in future
     public interface INotifyCollectionChangedSynchronizedViewList<TView> : IList<TView>, IList, ISynchronizedViewList<TView>, INotifyCollectionChanged, INotifyPropertyChanged
     {
     }
 
+    // IColleciton<T>.Count and ICollection.Count will be ambigious so use abstract class instead of interface
+    public abstract class NotifyCollectionChangedSynchronizedViewList<TView> :
+        INotifyCollectionChangedSynchronizedViewList<TView>,
+        IWritableSynchronizedViewList<TView>,
+        IList<TView>,
+        IList
+    {
+        protected readonly object gate = new object();
+
+        public abstract TView this[int index] { get; set; }
+
+        object? IList.this[int index]
+        {
+            get
+            {
+                return this[index];
+            }
+            set => ((IList<TView>)this)[index] = (TView)value!;
+        }
+
+        public abstract int Count { get; }
+        public bool IsReadOnly => false;
+        public bool IsFixedSize => false;
+        public bool IsSynchronized => true;
+        public object SyncRoot => gate;
+
+        public abstract event NotifyCollectionChangedEventHandler? CollectionChanged;
+        public abstract event PropertyChangedEventHandler? PropertyChanged;
+
+        public abstract void Add(TView item);
+
+        int IList.Add(object? value)
+        {
+            Add((TView)value!);
+            return -1; // itself does not add in this collection
+        }
+
+        public abstract bool Contains(TView item);
+
+        bool IList.Contains(object? value)
+        {
+            if (IsCompatibleObject(value))
+            {
+                return Contains((TView)value!);
+            }
+            return false;
+        }
+
+        public abstract void Dispose();
+        public abstract IEnumerator<TView> GetEnumerator();
+        public abstract int IndexOf(TView item);
+
+        int IList.IndexOf(object? item)
+        {
+            if (IsCompatibleObject(item))
+            {
+                return IndexOf((TView)item!);
+            }
+            return -1;
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return GetEnumerator();
+        }
+
+        static bool IsCompatibleObject(object? value)
+        {
+            return value is TView || value == null && default(TView) == null;
+        }
+
+        void ICollection<TView>.Clear() => throw new NotSupportedException();
+        void IList.Clear() => throw new NotSupportedException();
+
+        void ICollection<TView>.CopyTo(TView[] array, int arrayIndex) => throw new NotSupportedException();
+        void ICollection.CopyTo(Array array, int index) => throw new NotSupportedException();
+
+        void IList<TView>.Insert(int index, TView item) => throw new NotSupportedException();
+        void IList.Insert(int index, object? value) => throw new NotSupportedException();
+        bool ICollection<TView>.Remove(TView item) => throw new NotSupportedException();
+        void IList.Remove(object? value) => throw new NotSupportedException();
+        void IList.RemoveAt(int index) => throw new NotSupportedException();
+        void IList<TView>.RemoveAt(int index) => throw new NotSupportedException();
+    }
+
     public static class ObservableCollectionExtensions
     {
         public static ISynchronizedViewList<T> ToViewList<T>(this IObservableCollection<T> collection)
@@ -86,7 +173,7 @@ namespace ObservableCollections
         public static ISynchronizedViewList<TView> ToViewList<T, TView>(this IObservableCollection<T> collection, Func<T, TView> transform)
         {
             // Optimized for non filtered
-            return new NonFilteredSynchronizedViewList<T, TView>(collection.CreateView(transform));
+            return new NonFilteredSynchronizedViewList<T, TView>(collection.CreateView(transform), isSupportRangeFeature: true, null, null);
         }
 
         public static INotifyCollectionChangedSynchronizedViewList<T> ToNotifyCollectionChanged<T>(this IObservableCollection<T> collection)
@@ -107,7 +194,7 @@ namespace ObservableCollections
         public static INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged<T, TView>(this IObservableCollection<T> collection, Func<T, TView> transform, ICollectionEventDispatcher? collectionEventDispatcher)
         {
             // Optimized for non filtered
-            return new NonFilteredNotifyCollectionChangedSynchronizedViewList<T, TView>(collection.CreateView(transform), collectionEventDispatcher);
+            return new NonFilteredSynchronizedViewList<T, TView>(collection.CreateView(transform), isSupportRangeFeature: false, collectionEventDispatcher, null);
         }
     }
 }

src/ObservableCollections/ObservableDictionary.Views.cs

@@ -111,17 +111,17 @@ namespace ObservableCollections
 
             public ISynchronizedViewList<TView> ToViewList()
             {
-                return new FiltableSynchronizedViewList<KeyValuePair<TKey, TValue>, TView>(this);
+                return new FiltableSynchronizedViewList<KeyValuePair<TKey, TValue>, TView>(this, isSupportRangeFeature: true);
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged()
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged()
             {
-                return new NotifyCollectionChangedSynchronizedViewList<KeyValuePair<TKey, TValue>, TView>(this, null);
+                return new FiltableSynchronizedViewList<KeyValuePair<TKey, TValue>, TView>(this, isSupportRangeFeature: false);
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
             {
-                return new NotifyCollectionChangedSynchronizedViewList<KeyValuePair<TKey, TValue>, TView>(this, collectionEventDispatcher);
+                return new FiltableSynchronizedViewList<KeyValuePair<TKey, TValue>, TView>(this, isSupportRangeFeature: false, collectionEventDispatcher);
             }
 
             public IEnumerator<TView> GetEnumerator()

src/ObservableCollections/ObservableHashSet.Views.cs

@@ -106,17 +106,17 @@ namespace ObservableCollections
 
             public ISynchronizedViewList<TView> ToViewList()
             {
-                return new FiltableSynchronizedViewList<T, TView>(this);
+                return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: true);
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged()
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged()
             {
-                return new NotifyCollectionChangedSynchronizedViewList<T, TView>(this, null);
+                return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: false);
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
             {
-                return new NotifyCollectionChangedSynchronizedViewList<T, TView>(this, collectionEventDispatcher);
+                return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: false, collectionEventDispatcher);
             }
 
             public IEnumerator<TView> GetEnumerator()

src/ObservableCollections/ObservableList.Views.cs

@@ -43,7 +43,7 @@ namespace ObservableCollections
 
         public INotifyCollectionChangedSynchronizedViewList<TView> ToWritableNotifyCollectionChanged<TView>(Func<T, TView> transform, WritableViewChangedEventHandler<T, TView>? converter, ICollectionEventDispatcher? collectionEventDispatcher)
         {
-            return new NonFilteredNotifyCollectionChangedSynchronizedViewList<T, TView>(CreateView(transform), collectionEventDispatcher, converter);
+            return new NonFilteredSynchronizedViewList<T, TView>(CreateView(transform), isSupportRangeFeature: false, collectionEventDispatcher, converter);
         }
 
         internal sealed class View<TView> : ISynchronizedView<T, TView>, IWritableSynchronizedView<T, TView>
@@ -141,17 +141,17 @@ namespace ObservableCollections
 
             public ISynchronizedViewList<TView> ToViewList()
             {
-                return new FiltableSynchronizedViewList<T, TView>(this);
+                return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: true);
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged()
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged()
             {
-                return new NotifyCollectionChangedSynchronizedViewList<T, TView>(this, null);
+                return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: false);
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
             {
-                return new NotifyCollectionChangedSynchronizedViewList<T, TView>(this, collectionEventDispatcher);
+                return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: false, collectionEventDispatcher);
             }
 
             public IEnumerator<TView> GetEnumerator()
@@ -370,27 +370,29 @@ namespace ObservableCollections
 
             public IWritableSynchronizedViewList<TView> ToWritableViewList(WritableViewChangedEventHandler<T, TView> converter)
             {
-                return new FiltableWritableSynchronizedViewList<T, TView>(this, converter);
+                return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: true, converter: converter);
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToWritableNotifyCollectionChanged(WritableViewChangedEventHandler<T, TView> converter)
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToWritableNotifyCollectionChanged(WritableViewChangedEventHandler<T, TView> converter)
             {
-                return new NotifyCollectionChangedSynchronizedViewList<T, TView>(this, null, converter);
+                return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: false, converter: converter);
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToWritableNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToWritableNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
             {
-                return new NotifyCollectionChangedSynchronizedViewList<T, TView>(this, collectionEventDispatcher,
+                return new FiltableSynchronizedViewList<T, TView>(this,
-                                                                                 static (TView newView, T originalValue, ref bool setValue) =>
+                    isSupportRangeFeature: false,
-                                                                                 {
+                    collectionEventDispatcher,
-                                                                                     setValue = true;
+                    static (TView newView, T originalValue, ref bool setValue) =>
-                                                                                     return originalValue;
+                    {
-                                                                                 });
+                        setValue = true;
+                        return originalValue;
+                    });
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToWritableNotifyCollectionChanged(WritableViewChangedEventHandler<T, TView> converter, ICollectionEventDispatcher? collectionEventDispatcher)
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToWritableNotifyCollectionChanged(WritableViewChangedEventHandler<T, TView> converter, ICollectionEventDispatcher? collectionEventDispatcher)
             {
-                return new NotifyCollectionChangedSynchronizedViewList<T, TView>(this, collectionEventDispatcher, converter);
+                return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: false, collectionEventDispatcher, converter);
             }
 
             #endregion

src/ObservableCollections/ObservableQueue.Views.cs

@@ -106,17 +106,17 @@ namespace ObservableCollections
 
             public ISynchronizedViewList<TView> ToViewList()
             {
-                return new FiltableSynchronizedViewList<T, TView>(this);
+                return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: true);
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged()
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged()
             {
-                return new NotifyCollectionChangedSynchronizedViewList<T, TView>(this, null);
+                return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: false);
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
             {
-                return new NotifyCollectionChangedSynchronizedViewList<T, TView>(this, collectionEventDispatcher);
+                return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: false, collectionEventDispatcher);
             }
 
             public IEnumerator<TView> GetEnumerator()

src/ObservableCollections/ObservableRingBuffer.Views.cs

@@ -108,22 +108,22 @@ namespace ObservableCollections
 
             public ISynchronizedViewList<TView> ToViewList()
             {
-                return new FiltableSynchronizedViewList<T, TView>(this);
+                return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: true);
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged()
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged()
             {
                 lock (SyncRoot)
                 {
-                    return new NotifyCollectionChangedSynchronizedViewList<T, TView>(this, null);
+                    return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: false);
                 }
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
             {
                 lock (SyncRoot)
                 {
-                    return new NotifyCollectionChangedSynchronizedViewList<T, TView>(this, collectionEventDispatcher);
+                    return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: false, collectionEventDispatcher);
                 }
             }
 

src/ObservableCollections/ObservableStack.Views.cs

@@ -105,22 +105,22 @@ namespace ObservableCollections
 
             public ISynchronizedViewList<TView> ToViewList()
             {
-                return new FiltableSynchronizedViewList<T, TView>(this);
+                return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: true);
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged()
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged()
             {
                 lock (SyncRoot)
                 {
-                    return new NotifyCollectionChangedSynchronizedViewList<T, TView>(this, null);
+                    return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: false);
                 }
             }
 
-            public INotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
+            public NotifyCollectionChangedSynchronizedViewList<TView> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
             {
                 lock (SyncRoot)
                 {
-                    return new NotifyCollectionChangedSynchronizedViewList<T, TView>(this, collectionEventDispatcher);
+                    return new FiltableSynchronizedViewList<T, TView>(this, isSupportRangeFeature: false, collectionEventDispatcher);
                 }
             }