FamilyMapCollection.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / FamilyMapCollection.cs / 1305600 / FamilyMapCollection.cs
                        
                        
                            //------------------------------------------------------------------------ 
//
//  Microsoft Windows Client Platform
//  Copyright (C) Microsoft Corporation, 2002
// 
//  File:      FamilyMapCollection.cs
// 
//  Contents:  FontFamilyMapCollection 
//
//  Created:   2-5-05 Niklas Borson (niklasb) 
//
//-----------------------------------------------------------------------

using System; 
using System.Globalization;
using SC=System.Collections; 
using System.Collections.Generic; 
using MS.Internal.FontFace;
 
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;

namespace System.Windows.Media 
{
    ///  
    /// List of FontFamilyMap objects in a FontFamily, in lookup order. 
    /// 
    public sealed class FontFamilyMapCollection : IList, SC.IList 
    {
        private const int InitialCapacity = 8;
        private CompositeFontInfo _fontInfo;
        private FontFamilyMap[] _items; 
        private int _count;
 
        internal FontFamilyMapCollection(CompositeFontInfo fontInfo) 
        {
            _fontInfo = fontInfo; 
            _items = null;
            _count = 0;
        }
 
        #region IEnumerable members
 
        ///  
        /// Returns an enumerator for iterating through the list.
        ///  
        public IEnumerator GetEnumerator()
        {
            return new Enumerator(_items, _count);
        } 

        SC.IEnumerator SC.IEnumerable.GetEnumerator() 
        { 
            return new Enumerator(_items, _count);
        } 

        #endregion

        #region ICollection methods 

        ///  
        /// Adds a FontFamilyMap to the font family. 
        /// 
        public void Add(FontFamilyMap item) 
        {
            InsertItem(_count, item);
        }
 
        /// 
        /// Removes all FontFamilyMap objects from the FontFamily. 
        ///  
        public void Clear()
        { 
            ClearItems();
        }

        ///  
        /// Determines whether the FontFamily contains the specified FontFamilyMap.
        ///  
        public bool Contains(FontFamilyMap item) 
        {
            return FindItem(item) >= 0; 
        }

        /// 
        /// Copies the contents of the list to the specified array. 
        /// 
        public void CopyTo(FontFamilyMap[] array, int index) 
        { 
            if (array == null)
                throw new ArgumentNullException("array"); 

            if (index >= array.Length)
                throw new ArgumentException(SR.Get(SRID.Collection_CopyTo_IndexGreaterThanOrEqualToArrayLength, "index", "array"));
 
            if (_count > array.Length - index)
                throw new ArgumentException(SR.Get(SRID.Collection_CopyTo_NumberOfElementsExceedsArrayLength, index, "array")); 
 
            if (_count != 0)
                Array.Copy(_items, 0, array, index, _count); 
        }

        void SC.ICollection.CopyTo(Array array, int index)
        { 
            if (array == null)
                throw new ArgumentNullException("array"); 
 
            if (array.Rank != 1)
                throw new ArgumentException(SR.Get(SRID.Collection_CopyTo_ArrayCannotBeMultidimensional)); 

            Type elementType = array.GetType().GetElementType();
            if (!elementType.IsAssignableFrom(typeof(FamilyTypeface)))
                throw new ArgumentException(SR.Get(SRID.CannotConvertType, typeof(FamilyTypeface), elementType)); 

            if (index >= array.Length) 
                throw new ArgumentException(SR.Get(SRID.Collection_CopyTo_IndexGreaterThanOrEqualToArrayLength, "index", "array")); 

            if (_count > array.Length - index) 
                throw new ArgumentException(SR.Get(SRID.Collection_CopyTo_NumberOfElementsExceedsArrayLength, index, "array"));

            if (_count != 0)
                Array.Copy(_items, 0, array, index, _count); 
        }
 
        bool SC.ICollection.IsSynchronized 
        {
            get { return false; } 
        }

        object SC.ICollection.SyncRoot
        { 
            get { return (_fontInfo != null) ? (object)_fontInfo : (object)this; }
        } 
 
        /// 
        /// Removes the specified FontFamilyMap. 
        /// 
        public bool Remove(FontFamilyMap item)
        {
            VerifyChangeable(); 
            int i = FindItem(item);
            if (i >= 0) 
            { 
                RemoveAt(i);
                return true; 
            }
            return false;
        }
 
        /// 
        /// Gets the number of items in the list. 
        ///  
        public int Count
        { 
            get { return _count; }
        }

        ///  
        /// Gets a value indicating whether the FontFamilyMap list can be changed.
        ///  
        public bool IsReadOnly 
        {
            get { return _fontInfo == null; } 
        }

        #endregion
 
        #region IList members
 
        ///  
        /// Gets the index of the specified FontFamilyMap.
        ///  
        public int IndexOf(FontFamilyMap item)
        {
            return FindItem(item);
        } 

        ///  
        /// Inserts a FontFamilyMap into the list. 
        /// 
        public void Insert(int index, FontFamilyMap item) 
        {
            InsertItem(index, item);
        }
 
        /// 
        /// Removes the FontFamilyMap at the specified index. 
        ///  
        public void RemoveAt(int index)
        { 
            RemoveItem(index);
        }

        ///  
        /// Gets or sets the FontFamilyMap at the specified index.
        ///  
        public FontFamilyMap this[int index] 
        {
            get 
            {
                RangeCheck(index);
                return _items[index];
            } 

            set 
            { 
                SetItem(index, value);
            } 
        }

        int SC.IList.Add(object value)
        { 
            return InsertItem(_count, ConvertValue(value));
        } 
 
        bool SC.IList.Contains(object value)
        { 
            return FindItem(value as FontFamilyMap) >= 0;
        }

        int SC.IList.IndexOf(object value) 
        {
            return FindItem(value as FontFamilyMap); 
        } 

        void SC.IList.Insert(int index, object item) 
        {
            InsertItem(index, ConvertValue(item));
        }
 
        void SC.IList.Remove(object value)
        { 
            VerifyChangeable(); 
            int i = FindItem(value as FontFamilyMap);
            if (i >= 0) 
                RemoveItem(i);
        }

        bool SC.IList.IsFixedSize 
        {
            get { return IsReadOnly; } 
        } 

        object SC.IList.this[int index] 
        {
            get
            {
                RangeCheck(index); 
                return _items[index];
            } 
 
            set
            { 
                SetItem(index, ConvertValue(value));
            }
        }
 
        #endregion
 
        #region Internal implementation 

        private int InsertItem(int index, FontFamilyMap item) 
        {
            if (item == null)
                throw new ArgumentNullException("item");
 
            VerifyChangeable();
 
            // Limit the number of family maps because we use ushort indexes in the skip lists. 
            // To exceed this limit a user would have to have a separate family maps for almost
            // every Unicode value, in which case (since we search sequentially) performance 
            // would become a problem.
            if (_count + 1 >= ushort.MaxValue)
                throw new InvalidOperationException(SR.Get(SRID.CompositeFont_TooManyFamilyMaps));
 
            // Validate the index.
            if (index < 0 || index > Count) 
                throw new ArgumentOutOfRangeException("index"); 

            // PrepareToAddFamilyMap validates the familyName and updates the internal state 
            // of the CompositeFontInfo object.
            _fontInfo.PrepareToAddFamilyMap(item);

            // Make room for the new item. 
            if (_items == null)
            { 
                _items = new FontFamilyMap[InitialCapacity]; 
            }
            else if (_count == _items.Length) 
            {
                FontFamilyMap[] items = new FontFamilyMap[_count * 2];
                for (int i = 0; i < index; ++i)
                    items[i] = _items[i]; 
                for (int i = index; i < _count; ++i)
                    items[i + 1] = _items[i]; 
                _items = items; 
            }
            else if (index < _count) 
            {
                for (int i = _count - 1; i >= index; --i)
                    _items[i + 1] = _items[i];
            } 

            // Add the item. 
            _items[index] = item; 
            _count++;
 
            return index;
        }

        private void SetItem(int index, FontFamilyMap item) 
        {
            if (item == null) 
                throw new ArgumentNullException("item"); 

            VerifyChangeable(); 
            RangeCheck(index);

            // PrepareToAddFamilyMap validates the familyName and updates the internal state
            // of the CompositeFontInfo object. 
            _fontInfo.PrepareToAddFamilyMap(item);
 
            if (item.Language != _items[index].Language) 
            {
                _fontInfo.InvalidateFamilyMapRanges(); 
            }

            _items[index] = item;
        } 

        private void ClearItems() 
        { 
            VerifyChangeable();
 
            _fontInfo.InvalidateFamilyMapRanges();

            _count = 0;
            _items = null; 
        }
 
        private void RemoveItem(int index) 
        {
            VerifyChangeable(); 
            RangeCheck(index);

            _fontInfo.InvalidateFamilyMapRanges();
 
            _count--;
            for (int i = index; i < _count; ++i) 
            { 
                _items[i] = _items[i + 1];
            } 
            _items[_count] = null;
        }

        private int FindItem(FontFamilyMap item) 
        {
            if (_count != 0 && item != null) 
            { 
                for (int i = 0; i < _count; ++i)
                { 
                    if (_items[i].Equals(item))
                        return i;
                }
            } 
            return -1;
        } 
 
        private void RangeCheck(int index)
        { 
            if (index < 0 || index >= _count)
                throw new ArgumentOutOfRangeException("index");
        }
 
        private void VerifyChangeable()
        { 
            if (_fontInfo == null) 
                throw new NotSupportedException(SR.Get(SRID.General_ObjectIsReadOnly));
        } 

        private FontFamilyMap ConvertValue(object obj)
        {
            if (obj == null) 
                throw new ArgumentNullException("obj");
 
            FontFamilyMap familyMap = obj as FontFamilyMap; 
            if (familyMap == null)
                throw new ArgumentException(SR.Get(SRID.CannotConvertType, obj.GetType(), typeof(FontFamilyMap))); 

            return familyMap;
        }
 
        private class Enumerator : IEnumerator, SC.IEnumerator
        { 
            FontFamilyMap[] _items; 
            int _count;
            int _index; 
            FontFamilyMap _current;

            internal Enumerator(FontFamilyMap[] items, int count)
            { 
                _items = items;
                _count = count; 
                _index = -1; 
                _current = null;
            } 

            public bool MoveNext()
            {
                if (_index < _count) 
                {
                    _index++; 
                    if (_index < _count) 
                    {
                        _current = _items[_index]; 
                        return true;
                    }
                }
                _current = null; 
                return false;
            } 
 
            void SC.IEnumerator.Reset()
            { 
                _index = -1;
            }

            public FontFamilyMap Current 
            {
                get { return _current; } 
            } 

            object SC.IEnumerator.Current 
            {
                get
                {
                    // If there is no current item a non-generic IEnumerator should throw an exception, 
                    // but a generic IEnumerator is not required to.
                    if (_current == null) 
                        throw new InvalidOperationException(SR.Get(SRID.Enumerator_VerifyContext)); 

                    return _current; 
                }
            }

            public void Dispose() 
            {
            } 
        } 

        #endregion 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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FamilyMapCollection.cs source code in C# .NET

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