Visual3DCollection.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Core / CSharp / System / Windows / Media3D / Visual3DCollection.cs / 1 / Visual3DCollection.cs

                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (c) Microsoft Corporation.  All rights reserved.
//  
//
// History: 
//  6/9/2005 : [....] - Created 
//
//--------------------------------------------------------------------------- 

#pragma warning disable 1634, 1691  // suppressing PreSharp warnings

using MS.Utility; 
using MS.Internal;
using System; 
using System.Collections; 
using System.Collections.Generic;
using System.Diagnostics; 
using System.Globalization;
using System.Windows;
using MS.Internal.PresentationCore;
 
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID; 
 
namespace System.Windows.Media.Media3D
{ 
    /// 
    ///     A collection of Visual3D objects.
    /// 
    public sealed class Visual3DCollection : IList, IList 
    {
        //----------------------------------------------------- 
        // 
        //  Constructors
        // 
        //-----------------------------------------------------

        #region Constructors
 
        internal Visual3DCollection(IVisual3DContainer owner)
        { 
            _owner = owner; 
        }
 
        #endregion Constructors

        //------------------------------------------------------
        // 
        //  Public Methods
        // 
        //----------------------------------------------------- 

        #region Public Methods 

        /// 
        ///     Adds the value to the collection.
        ///  
        public void Add(Visual3D value)
        { 
            VerifyAPIForAdd(value); 

            int addedPosition = InternalCount; 
            _collection.Add(value);
            InvalidateEnumerators();

            // NOTE: The collection must be updated before notifying the Visual. 
            ConnectChild(addedPosition, value);
 
            Debug_ICC(); 
        }
 
        private void ConnectChild(int index, Visual3D value)
        {
            value.ParentIndex = index;
            _owner.AddChild(value); 
        }
 
        ///  
        ///     Inserts the value into the list at the specified position
        ///  
        public void Insert(int index, Visual3D value)
        {
            VerifyAPIForAdd(value);
 
            InternalInsert(index, value);
        } 
 
        /// 
        ///     Removes the value from the collection. 
        /// 
        public bool Remove(Visual3D value)
        {
            VerifyAPIReadWrite(value); 

            if (!_collection.Contains(value)) 
            { 
                return false;
            } 

            InternalRemoveAt(value.ParentIndex);

            return true; 
        }
 
        ///  
        ///     Removes the value at the specified index.
        ///  
        public void RemoveAt(int index)
        {
            if (index < 0 || index >= InternalCount)
            { 
                throw new ArgumentOutOfRangeException("index");
            } 
 
            VerifyAPIReadWrite(_collection[index]);
 
            InternalRemoveAt(index);
        }

        ///  
        ///     Removes all IElements from the collection.
        ///  
        public void Clear() 
        {
            VerifyAPIReadWrite(); 

            // Rather than clear, we swap out the FrugalStructList because
            // we need to keep the old values around to notify the parent
            // they were removed. 
            FrugalStructList oldCollection = _collection;
            _collection = new FrugalStructList(); 
            InvalidateEnumerators(); 

            // NOTE: The collection must be updated before notifying the Visual. 
            for (int i = oldCollection.Count - 1; i >= 0; i--)
            {
                _owner.RemoveChild(oldCollection[i]);
            } 

            Debug_ICC(); 
        } 

        ///  
        ///     Copies the IElements of the collection into "array" starting at "index"
        /// 
        public void CopyTo(Visual3D[] array, int index)
        { 
            VerifyAPIReadOnly();
 
            if (array == null) 
            {
                throw new ArgumentNullException("array"); 
            }

            // The extra "index >= array.Length" check in because even if _collection.Count
            // is 0 the index is not allowed to be equal or greater than the length 
            // (from the MSDN ICollection docs)
            if (index < 0 || index >= array.Length || (index + _collection.Count) > array.Length) 
            { 
                throw new ArgumentOutOfRangeException("index");
            } 

            _collection.CopyTo(array, index);
        }
 
        void ICollection.CopyTo(Array array, int index)
        { 
            VerifyAPIReadOnly(); 

            if (array == null) 
            {
                throw new ArgumentNullException("array");
            }
 
            // The extra "index >= array.Length" check in because even if _collection.Count
            // is 0 the index is not allowed to be equal or greater than the length 
            // (from the MSDN ICollection docs) 
            if (index < 0 || index >= array.Length || (index + _collection.Count) > array.Length)
            { 
                throw new ArgumentOutOfRangeException("index");
            }

            if (array.Rank != 1) 
            {
                throw new ArgumentException(SR.Get(SRID.Collection_BadRank)); 
            } 

            // Elsewhere in the collection we throw an AE when the type is 
            // bad so we do it here as well to be consistent
            try
            {
                int count = _collection.Count; 
                for (int i = 0; i < count; i++)
                { 
                    array.SetValue(_collection[i], index + i); 
                }
            } 
            catch (InvalidCastException e)
            {
                throw new ArgumentException(SR.Get(SRID.Collection_BadDestArray, "Visual3DCollection"), e);
            } 
        }
 
        ///  
        ///     Determines if the list contains "value"
        ///  
        public bool Contains(Visual3D value)
        {
            VerifyAPIReadOnly(value);
 
            return (value != null && (value.InternalVisualParent == _owner));
        } 
 
        /// 
        ///     Returns the index of value in the list 
        /// 
        public int IndexOf(Visual3D value)
        {
            VerifyAPIReadOnly(value); 

            if (value == null || (value.InternalVisualParent != _owner)) 
            { 
                return -1;
            } 

#pragma warning disable 56506 // Suppress presharp warning: Parameter 'value' to this public method must be validated:  A null-dereference can occur here.
            return value.ParentIndex;
#pragma warning restore 56506 
        }
 
        ///  
        ///     Returns an Enumerator for the collection.
        ///  
        public Enumerator GetEnumerator()
        {
            VerifyAPIReadOnly();
 
            return new Enumerator(this);
        } 
 
        IEnumerator IEnumerable.GetEnumerator()
        { 
            return GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator() 
        {
            return GetEnumerator(); 
        } 

        #endregion Public Methods 

        //------------------------------------------------------
        //
        //  Public Properties 
        //
        //------------------------------------------------------ 
 
        #region Public Properties
 
        /// 
        ///     Returns the IElement at the given index in the collection.
        /// 
        public Visual3D this[int index] 
        {
            get 
            { 
                VerifyAPIReadOnly();
 
                return InternalGetItem(index);
            }
            set
            { 
                if (index < 0 || index >= InternalCount)
                { 
                    throw new ArgumentOutOfRangeException("index"); 
                }
 
                VerifyAPIForAdd(value);

                InternalRemoveAt(index);
                InternalInsert(index, value); 
            }
        } 
 
        /// 
        ///     The number of IElements contained in the collection. 
        /// 
        public int Count
        {
            get 
            {
                VerifyAPIReadOnly(); 
 
                return InternalCount;
            } 
        }

        bool ICollection.IsSynchronized
        { 
            get
            { 
                VerifyAPIReadOnly(); 

                // True because we force single thread access via VerifyAccess() 
                return true;
            }
        }
 
        object ICollection.SyncRoot
        { 
            get 
            {
                VerifyAPIReadOnly(); 

                return _owner;
            }
        } 

        bool ICollection.IsReadOnly 
        { 
            get
            { 
                VerifyAPIReadOnly();

                return false;
            } 
        }
 
        #region IList Members 

        ///  
        /// Adds an element to the Visual3DCollection
        /// 
        int IList.Add(object value)
        { 
            Add(Cast(value));
            return InternalCount - 1; 
        } 

        ///  
        /// Determines whether an element is in the Visual3DCollection.
        /// 
        bool IList.Contains(object value)
        { 
            return Contains(value as Visual3D);
        } 
 
        /// 
        /// Returns the index of the element in the Visual3DCollection 
        /// 
        int IList.IndexOf(object value)
        {
            return IndexOf(value as Visual3D); 
        }
 
        ///  
        /// Inserts an element into the Visual3DCollection
        ///  
        void IList.Insert(int index, object value)
        {
            Insert(index, Cast(value));
        } 

        ///  
        ///  
        bool IList.IsFixedSize
        { 
            get { return false; }
        }

        ///  
        /// 
        bool IList.IsReadOnly 
        { 
            get { return false; }
        } 

        /// 
        /// Removes an element from the Visual3DCollection
        ///  
        void IList.Remove(object value)
        { 
            Remove(value as Visual3D); 
        }
 
        /// 
        /// For more details, see 
        /// 
        object IList.this[int index] 
        {
            get 
            { 
                return this[index];
            } 
            set
            {
                this[index] = Cast(value);
            } 
        }
 
        #endregion 

        #endregion Public Properties 

        //-----------------------------------------------------
        //
        //  Public Events 
        //
        //------------------------------------------------------ 
 
        //-----------------------------------------------------
        // 
        //  Internal Methods
        //
        //-----------------------------------------------------
 
        #region Internal Methods
 
        internal Visual3D InternalGetItem(int index) 
        {
            return _collection[index]; 
        }

        #endregion Internal Methods
 
        //-----------------------------------------------------
        // 
        //  Internal Properties 
        //
        //------------------------------------------------------ 

        #region Internal Properties

        internal int InternalCount 
        {
            get { return _collection.Count; } 
        } 

        #endregion Internal Properties 

        //-----------------------------------------------------
        //
        //  Private Methods 
        //
        //------------------------------------------------------ 
 
        #region Private Methods
 
        private void VerifyAPIReadOnly()
        {
            Debug_ICC();
            _owner.VerifyAPIReadOnly(); 
        }
 
        private void VerifyAPIReadOnly(Visual3D other) 
        {
            Debug_ICC(); 
            _owner.VerifyAPIReadOnly(other);
        }

        private void VerifyAPIReadWrite() 
        {
            Debug_ICC(); 
            _owner.VerifyAPIReadWrite(); 
        }
 
        private void VerifyAPIReadWrite(Visual3D other)
        {
            Debug_ICC();
            _owner.VerifyAPIReadWrite(other); 
        }
 
        private Visual3D Cast(object value) 
        {
            if( value == null ) 
            {
                throw new System.ArgumentNullException("value");
            }
 
            if (!(value is Visual3D))
            { 
                throw new System.ArgumentException(SR.Get(SRID.Collection_BadType, this.GetType().Name, value.GetType().Name, "Visual3D")); 
            }
 
            return (Visual3D) value;
        }

        private void VerifyAPIForAdd(Visual3D value) 
        {
            if (value == null) 
            { 
                throw new System.ArgumentException(SR.Get(SRID.Collection_NoNull));
            } 

            VerifyAPIReadWrite(value);

            if (value.InternalVisualParent != null) 
            {
                throw new System.ArgumentException(SR.Get(SRID.VisualCollection_VisualHasParent)); 
            } 
        }
 
        private void InternalInsert(int index, Visual3D value)
        {
            _collection.Insert(index, value);
 
            // Update ParentIndex value on each Visual3D.  Run through them
            // and increment.  Note that this means that Inserting/Removal from a 
            // Visual3DCollection can be O(n^2) if done in the wrong order. 
            for (int i = index + 1, count = InternalCount; i < count; i++)
            { 
                Debug.Assert(InternalGetItem(i).ParentIndex == i - 1,
                    "ParentIndex has been corrupted.");

                InternalGetItem(i).ParentIndex = i; 
            }
 
            InvalidateEnumerators(); 

            // NOTE: The collection must be updated before notifying the Visual. 
            ConnectChild(index, value);

            Debug_ICC();
        } 

        private void InternalRemoveAt(int index) 
        { 
            Visual3D value = _collection[index];
 
            _collection.RemoveAt(index);
            // Update ParentIndices after the modified index are now invalid.  Run through them
            // and decrement.  Note that this means that Inserting/Removal from a
            // Visual3DCollection can be O(n^2) if done in the wrong order. 
            for (int i = index; i < InternalCount; i++)
            { 
                Debug.Assert(InternalGetItem(i).ParentIndex == i + 1, 
                    "ParentIndex has been corrupted.");
 
                InternalGetItem(i).ParentIndex = i;
            }

            InvalidateEnumerators(); 

            // NOTE: The collection must be updated before notifying the Visual. 
            _owner.RemoveChild(value); 

            Debug_ICC(); 
        }

        // Each member which modifies the collection should call this method to
        // invalidate any enumerators which might have been handed out. 
        private void InvalidateEnumerators()
        { 
            _version++; 
        }
 
        #endregion Private Methods

        //------------------------------------------------------
        // 
        //  DEBUG
        // 
        //----------------------------------------------------- 

        #region DEBUG 

        [Conditional("DEBUG")]
        private void Debug_ICC()
        { 
            Debug.Assert(_owner != null, "How did an Visual3DCollection get constructed without an owner?");
 
            Dictionary duplicates = new Dictionary(); 

            for (int i = 0; i < _collection.Count; i++) 
            {
                Visual3D visual = _collection[i];

                Debug.Assert(!duplicates.ContainsKey(visual), "How did the visual get re-inserted?"); 
                duplicates.Add(visual, String.Empty);
 
                Debug.Assert(visual.InternalVisualParent == _owner, "Why isn't our child's parent pointer the same as the collection owner?"); 
                Debug.Assert(visual.ParentIndex == i,
                    String.Format( 
                        CultureInfo.InvariantCulture,
                        "Child's ParentIndex does not match the child's actual position in the collection. Expected='{0}' Actual='{1}'",
                        i,
                        visual.ParentIndex)); 

                // If the Visual3D is being added to the collection via a resource reference 
                // its inheritance context will be the owner of the ResourceDictionary in which 
                // it was declared.  (For more info, see Windows OS Bugs #1614016)
                // 
                // Debug.Assert(visual.InheritanceContext == _inheritanceContext,
                //    "How did a Visual3D get inserted without updating it's InheritanceContext?");
            }
        } 

        #endregion DEBUG 
 
        //------------------------------------------------------
        // 
        //  Private Fields
        //
        //-----------------------------------------------------
 
        #region Private Fields
 
        private IVisual3DContainer _owner = null; 
        private FrugalStructList _collection = new FrugalStructList();
        private int _version = 0; 

        #endregion Private Fields

        //----------------------------------------------------- 
        //
        //  Enumerator 
        // 
        //-----------------------------------------------------
 
        #region Enumerator

        /// 
        ///     VisualCollection Enumerator. 
        /// 
        public struct Enumerator : IEnumerator, IEnumerator 
        { 
            #region Constructors
 
            internal Enumerator(Visual3DCollection list)
            {
                Debug.Assert(list != null, "list may not be null.");
 
                _list = list;
                _index = -1; 
                _version = _list._version; 
            }
 
            #endregion Constructors

            #region Public Methods
 
            /// 
            ///     Advances the enumerator to the next IElement of the collection. 
            ///  
            public bool MoveNext()
            { 
                if (_list._version != _version)
                {
                    throw new InvalidOperationException(SR.Get(SRID.Enumerator_CollectionChanged));
                } 

                int count = _list.Count; 
 
                if (_index < count)
                { 
                    _index++;
                }

                return _index < count; 
            }
 
            ///  
            ///     Resets the enumerator to its initial position.
            ///  
            public void Reset()
            {
                if (_list._version != _version)
                { 
                    throw new InvalidOperationException(SR.Get(SRID.Enumerator_CollectionChanged));
                } 
 
                _index = -1;
            } 

            void IDisposable.Dispose()
            {
                // Do nothing - Required by the IEnumeable contract. 
            }
 
            #endregion Public Methods 

            #region Public Properties 

            object IEnumerator.Current
            {
                get 
                {
                    return this.Current; 
                } 
            }
 
            /// 
            ///     Returns the current IElement.
            /// 
            public Visual3D Current 
            {
#pragma warning disable 1634, 1691 
#pragma warning disable 6503 
                get
                { 
                    if ((_index < 0) || (_index >= _list.Count))
                    {
                        throw new InvalidOperationException(SR.Get(SRID.Enumerator_VerifyContext));
                    } 

                    return _list[_index]; 
                } 
#pragma warning restore 6503
#pragma warning restore 1634, 1691 
            }

            #endregion Public Methods
 
            #region Private Fields
 
            private Visual3DCollection _list; 
            private int _index;
            private int _version; 

            #endregion Private Fields
        }
 
        #endregion Enumerator
    } 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------------- 
//
// 
//    Copyright (c) Microsoft Corporation.  All rights reserved.
//  
//
// History: 
//  6/9/2005 : [....] - Created 
//
//--------------------------------------------------------------------------- 

#pragma warning disable 1634, 1691  // suppressing PreSharp warnings

using MS.Utility; 
using MS.Internal;
using System; 
using System.Collections; 
using System.Collections.Generic;
using System.Diagnostics; 
using System.Globalization;
using System.Windows;
using MS.Internal.PresentationCore;
 
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID; 
 
namespace System.Windows.Media.Media3D
{ 
    /// 
    ///     A collection of Visual3D objects.
    /// 
    public sealed class Visual3DCollection : IList, IList 
    {
        //----------------------------------------------------- 
        // 
        //  Constructors
        // 
        //-----------------------------------------------------

        #region Constructors
 
        internal Visual3DCollection(IVisual3DContainer owner)
        { 
            _owner = owner; 
        }
 
        #endregion Constructors

        //------------------------------------------------------
        // 
        //  Public Methods
        // 
        //----------------------------------------------------- 

        #region Public Methods 

        /// 
        ///     Adds the value to the collection.
        ///  
        public void Add(Visual3D value)
        { 
            VerifyAPIForAdd(value); 

            int addedPosition = InternalCount; 
            _collection.Add(value);
            InvalidateEnumerators();

            // NOTE: The collection must be updated before notifying the Visual. 
            ConnectChild(addedPosition, value);
 
            Debug_ICC(); 
        }
 
        private void ConnectChild(int index, Visual3D value)
        {
            value.ParentIndex = index;
            _owner.AddChild(value); 
        }
 
        ///  
        ///     Inserts the value into the list at the specified position
        ///  
        public void Insert(int index, Visual3D value)
        {
            VerifyAPIForAdd(value);
 
            InternalInsert(index, value);
        } 
 
        /// 
        ///     Removes the value from the collection. 
        /// 
        public bool Remove(Visual3D value)
        {
            VerifyAPIReadWrite(value); 

            if (!_collection.Contains(value)) 
            { 
                return false;
            } 

            InternalRemoveAt(value.ParentIndex);

            return true; 
        }
 
        ///  
        ///     Removes the value at the specified index.
        ///  
        public void RemoveAt(int index)
        {
            if (index < 0 || index >= InternalCount)
            { 
                throw new ArgumentOutOfRangeException("index");
            } 
 
            VerifyAPIReadWrite(_collection[index]);
 
            InternalRemoveAt(index);
        }

        ///  
        ///     Removes all IElements from the collection.
        ///  
        public void Clear() 
        {
            VerifyAPIReadWrite(); 

            // Rather than clear, we swap out the FrugalStructList because
            // we need to keep the old values around to notify the parent
            // they were removed. 
            FrugalStructList oldCollection = _collection;
            _collection = new FrugalStructList(); 
            InvalidateEnumerators(); 

            // NOTE: The collection must be updated before notifying the Visual. 
            for (int i = oldCollection.Count - 1; i >= 0; i--)
            {
                _owner.RemoveChild(oldCollection[i]);
            } 

            Debug_ICC(); 
        } 

        ///  
        ///     Copies the IElements of the collection into "array" starting at "index"
        /// 
        public void CopyTo(Visual3D[] array, int index)
        { 
            VerifyAPIReadOnly();
 
            if (array == null) 
            {
                throw new ArgumentNullException("array"); 
            }

            // The extra "index >= array.Length" check in because even if _collection.Count
            // is 0 the index is not allowed to be equal or greater than the length 
            // (from the MSDN ICollection docs)
            if (index < 0 || index >= array.Length || (index + _collection.Count) > array.Length) 
            { 
                throw new ArgumentOutOfRangeException("index");
            } 

            _collection.CopyTo(array, index);
        }
 
        void ICollection.CopyTo(Array array, int index)
        { 
            VerifyAPIReadOnly(); 

            if (array == null) 
            {
                throw new ArgumentNullException("array");
            }
 
            // The extra "index >= array.Length" check in because even if _collection.Count
            // is 0 the index is not allowed to be equal or greater than the length 
            // (from the MSDN ICollection docs) 
            if (index < 0 || index >= array.Length || (index + _collection.Count) > array.Length)
            { 
                throw new ArgumentOutOfRangeException("index");
            }

            if (array.Rank != 1) 
            {
                throw new ArgumentException(SR.Get(SRID.Collection_BadRank)); 
            } 

            // Elsewhere in the collection we throw an AE when the type is 
            // bad so we do it here as well to be consistent
            try
            {
                int count = _collection.Count; 
                for (int i = 0; i < count; i++)
                { 
                    array.SetValue(_collection[i], index + i); 
                }
            } 
            catch (InvalidCastException e)
            {
                throw new ArgumentException(SR.Get(SRID.Collection_BadDestArray, "Visual3DCollection"), e);
            } 
        }
 
        ///  
        ///     Determines if the list contains "value"
        ///  
        public bool Contains(Visual3D value)
        {
            VerifyAPIReadOnly(value);
 
            return (value != null && (value.InternalVisualParent == _owner));
        } 
 
        /// 
        ///     Returns the index of value in the list 
        /// 
        public int IndexOf(Visual3D value)
        {
            VerifyAPIReadOnly(value); 

            if (value == null || (value.InternalVisualParent != _owner)) 
            { 
                return -1;
            } 

#pragma warning disable 56506 // Suppress presharp warning: Parameter 'value' to this public method must be validated:  A null-dereference can occur here.
            return value.ParentIndex;
#pragma warning restore 56506 
        }
 
        ///  
        ///     Returns an Enumerator for the collection.
        ///  
        public Enumerator GetEnumerator()
        {
            VerifyAPIReadOnly();
 
            return new Enumerator(this);
        } 
 
        IEnumerator IEnumerable.GetEnumerator()
        { 
            return GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator() 
        {
            return GetEnumerator(); 
        } 

        #endregion Public Methods 

        //------------------------------------------------------
        //
        //  Public Properties 
        //
        //------------------------------------------------------ 
 
        #region Public Properties
 
        /// 
        ///     Returns the IElement at the given index in the collection.
        /// 
        public Visual3D this[int index] 
        {
            get 
            { 
                VerifyAPIReadOnly();
 
                return InternalGetItem(index);
            }
            set
            { 
                if (index < 0 || index >= InternalCount)
                { 
                    throw new ArgumentOutOfRangeException("index"); 
                }
 
                VerifyAPIForAdd(value);

                InternalRemoveAt(index);
                InternalInsert(index, value); 
            }
        } 
 
        /// 
        ///     The number of IElements contained in the collection. 
        /// 
        public int Count
        {
            get 
            {
                VerifyAPIReadOnly(); 
 
                return InternalCount;
            } 
        }

        bool ICollection.IsSynchronized
        { 
            get
            { 
                VerifyAPIReadOnly(); 

                // True because we force single thread access via VerifyAccess() 
                return true;
            }
        }
 
        object ICollection.SyncRoot
        { 
            get 
            {
                VerifyAPIReadOnly(); 

                return _owner;
            }
        } 

        bool ICollection.IsReadOnly 
        { 
            get
            { 
                VerifyAPIReadOnly();

                return false;
            } 
        }
 
        #region IList Members 

        ///  
        /// Adds an element to the Visual3DCollection
        /// 
        int IList.Add(object value)
        { 
            Add(Cast(value));
            return InternalCount - 1; 
        } 

        ///  
        /// Determines whether an element is in the Visual3DCollection.
        /// 
        bool IList.Contains(object value)
        { 
            return Contains(value as Visual3D);
        } 
 
        /// 
        /// Returns the index of the element in the Visual3DCollection 
        /// 
        int IList.IndexOf(object value)
        {
            return IndexOf(value as Visual3D); 
        }
 
        ///  
        /// Inserts an element into the Visual3DCollection
        ///  
        void IList.Insert(int index, object value)
        {
            Insert(index, Cast(value));
        } 

        ///  
        ///  
        bool IList.IsFixedSize
        { 
            get { return false; }
        }

        ///  
        /// 
        bool IList.IsReadOnly 
        { 
            get { return false; }
        } 

        /// 
        /// Removes an element from the Visual3DCollection
        ///  
        void IList.Remove(object value)
        { 
            Remove(value as Visual3D); 
        }
 
        /// 
        /// For more details, see 
        /// 
        object IList.this[int index] 
        {
            get 
            { 
                return this[index];
            } 
            set
            {
                this[index] = Cast(value);
            } 
        }
 
        #endregion 

        #endregion Public Properties 

        //-----------------------------------------------------
        //
        //  Public Events 
        //
        //------------------------------------------------------ 
 
        //-----------------------------------------------------
        // 
        //  Internal Methods
        //
        //-----------------------------------------------------
 
        #region Internal Methods
 
        internal Visual3D InternalGetItem(int index) 
        {
            return _collection[index]; 
        }

        #endregion Internal Methods
 
        //-----------------------------------------------------
        // 
        //  Internal Properties 
        //
        //------------------------------------------------------ 

        #region Internal Properties

        internal int InternalCount 
        {
            get { return _collection.Count; } 
        } 

        #endregion Internal Properties 

        //-----------------------------------------------------
        //
        //  Private Methods 
        //
        //------------------------------------------------------ 
 
        #region Private Methods
 
        private void VerifyAPIReadOnly()
        {
            Debug_ICC();
            _owner.VerifyAPIReadOnly(); 
        }
 
        private void VerifyAPIReadOnly(Visual3D other) 
        {
            Debug_ICC(); 
            _owner.VerifyAPIReadOnly(other);
        }

        private void VerifyAPIReadWrite() 
        {
            Debug_ICC(); 
            _owner.VerifyAPIReadWrite(); 
        }
 
        private void VerifyAPIReadWrite(Visual3D other)
        {
            Debug_ICC();
            _owner.VerifyAPIReadWrite(other); 
        }
 
        private Visual3D Cast(object value) 
        {
            if( value == null ) 
            {
                throw new System.ArgumentNullException("value");
            }
 
            if (!(value is Visual3D))
            { 
                throw new System.ArgumentException(SR.Get(SRID.Collection_BadType, this.GetType().Name, value.GetType().Name, "Visual3D")); 
            }
 
            return (Visual3D) value;
        }

        private void VerifyAPIForAdd(Visual3D value) 
        {
            if (value == null) 
            { 
                throw new System.ArgumentException(SR.Get(SRID.Collection_NoNull));
            } 

            VerifyAPIReadWrite(value);

            if (value.InternalVisualParent != null) 
            {
                throw new System.ArgumentException(SR.Get(SRID.VisualCollection_VisualHasParent)); 
            } 
        }
 
        private void InternalInsert(int index, Visual3D value)
        {
            _collection.Insert(index, value);
 
            // Update ParentIndex value on each Visual3D.  Run through them
            // and increment.  Note that this means that Inserting/Removal from a 
            // Visual3DCollection can be O(n^2) if done in the wrong order. 
            for (int i = index + 1, count = InternalCount; i < count; i++)
            { 
                Debug.Assert(InternalGetItem(i).ParentIndex == i - 1,
                    "ParentIndex has been corrupted.");

                InternalGetItem(i).ParentIndex = i; 
            }
 
            InvalidateEnumerators(); 

            // NOTE: The collection must be updated before notifying the Visual. 
            ConnectChild(index, value);

            Debug_ICC();
        } 

        private void InternalRemoveAt(int index) 
        { 
            Visual3D value = _collection[index];
 
            _collection.RemoveAt(index);
            // Update ParentIndices after the modified index are now invalid.  Run through them
            // and decrement.  Note that this means that Inserting/Removal from a
            // Visual3DCollection can be O(n^2) if done in the wrong order. 
            for (int i = index; i < InternalCount; i++)
            { 
                Debug.Assert(InternalGetItem(i).ParentIndex == i + 1, 
                    "ParentIndex has been corrupted.");
 
                InternalGetItem(i).ParentIndex = i;
            }

            InvalidateEnumerators(); 

            // NOTE: The collection must be updated before notifying the Visual. 
            _owner.RemoveChild(value); 

            Debug_ICC(); 
        }

        // Each member which modifies the collection should call this method to
        // invalidate any enumerators which might have been handed out. 
        private void InvalidateEnumerators()
        { 
            _version++; 
        }
 
        #endregion Private Methods

        //------------------------------------------------------
        // 
        //  DEBUG
        // 
        //----------------------------------------------------- 

        #region DEBUG 

        [Conditional("DEBUG")]
        private void Debug_ICC()
        { 
            Debug.Assert(_owner != null, "How did an Visual3DCollection get constructed without an owner?");
 
            Dictionary duplicates = new Dictionary(); 

            for (int i = 0; i < _collection.Count; i++) 
            {
                Visual3D visual = _collection[i];

                Debug.Assert(!duplicates.ContainsKey(visual), "How did the visual get re-inserted?"); 
                duplicates.Add(visual, String.Empty);
 
                Debug.Assert(visual.InternalVisualParent == _owner, "Why isn't our child's parent pointer the same as the collection owner?"); 
                Debug.Assert(visual.ParentIndex == i,
                    String.Format( 
                        CultureInfo.InvariantCulture,
                        "Child's ParentIndex does not match the child's actual position in the collection. Expected='{0}' Actual='{1}'",
                        i,
                        visual.ParentIndex)); 

                // If the Visual3D is being added to the collection via a resource reference 
                // its inheritance context will be the owner of the ResourceDictionary in which 
                // it was declared.  (For more info, see Windows OS Bugs #1614016)
                // 
                // Debug.Assert(visual.InheritanceContext == _inheritanceContext,
                //    "How did a Visual3D get inserted without updating it's InheritanceContext?");
            }
        } 

        #endregion DEBUG 
 
        //------------------------------------------------------
        // 
        //  Private Fields
        //
        //-----------------------------------------------------
 
        #region Private Fields
 
        private IVisual3DContainer _owner = null; 
        private FrugalStructList _collection = new FrugalStructList();
        private int _version = 0; 

        #endregion Private Fields

        //----------------------------------------------------- 
        //
        //  Enumerator 
        // 
        //-----------------------------------------------------
 
        #region Enumerator

        /// 
        ///     VisualCollection Enumerator. 
        /// 
        public struct Enumerator : IEnumerator, IEnumerator 
        { 
            #region Constructors
 
            internal Enumerator(Visual3DCollection list)
            {
                Debug.Assert(list != null, "list may not be null.");
 
                _list = list;
                _index = -1; 
                _version = _list._version; 
            }
 
            #endregion Constructors

            #region Public Methods
 
            /// 
            ///     Advances the enumerator to the next IElement of the collection. 
            ///  
            public bool MoveNext()
            { 
                if (_list._version != _version)
                {
                    throw new InvalidOperationException(SR.Get(SRID.Enumerator_CollectionChanged));
                } 

                int count = _list.Count; 
 
                if (_index < count)
                { 
                    _index++;
                }

                return _index < count; 
            }
 
            ///  
            ///     Resets the enumerator to its initial position.
            ///  
            public void Reset()
            {
                if (_list._version != _version)
                { 
                    throw new InvalidOperationException(SR.Get(SRID.Enumerator_CollectionChanged));
                } 
 
                _index = -1;
            } 

            void IDisposable.Dispose()
            {
                // Do nothing - Required by the IEnumeable contract. 
            }
 
            #endregion Public Methods 

            #region Public Properties 

            object IEnumerator.Current
            {
                get 
                {
                    return this.Current; 
                } 
            }
 
            /// 
            ///     Returns the current IElement.
            /// 
            public Visual3D Current 
            {
#pragma warning disable 1634, 1691 
#pragma warning disable 6503 
                get
                { 
                    if ((_index < 0) || (_index >= _list.Count))
                    {
                        throw new InvalidOperationException(SR.Get(SRID.Enumerator_VerifyContext));
                    } 

                    return _list[_index]; 
                } 
#pragma warning restore 6503
#pragma warning restore 1634, 1691 
            }

            #endregion Public Methods
 
            #region Private Fields
 
            private Visual3DCollection _list; 
            private int _index;
            private int _version; 

            #endregion Private Fields
        }
 
        #endregion Enumerator
    } 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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