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//-----------------------------------------------------------------------
//
// Microsoft Windows Client Platform
// Copyright (C) Microsoft Corporation, 2002
//
// File: FamilyTypefaceCollection.cs
//
// Contents: FamilyTypefaceCollection
//
// 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
{
/// <summary>
/// List of FamilyTypeface objects in a FontFamily, in lookup order.
/// </summary>
public sealed class FamilyTypefaceCollection : IList<FamilyTypeface>, SC.IList
{
private const int InitialCapacity = 2;
private ICollection<Typeface> _innerList;
private FamilyTypeface[] _items;
private int _count;
/// <summary>
/// Constructs a read-write list of FamilyTypeface objects.
/// </summary>
internal FamilyTypefaceCollection()
{
_innerList = null;
_items = null;
_count = 0;
}
/// <summary>
/// Constructes a read-only list that wraps an ICollection.
/// </summary>
internal FamilyTypefaceCollection(ICollection<Typeface> innerList)
{
_innerList = innerList;
_items = null;
_count = innerList.Count;
}
#region IEnumerable members
/// <summary>
/// Returns an enumerator for iterating through the list.
/// </summary>
public IEnumerator<FamilyTypeface> GetEnumerator()
{
return new Enumerator(this);
}
SC.IEnumerator SC.IEnumerable.GetEnumerator()
{
return new Enumerator(this);
}
#endregion
#region ICollection methods
/// <summary>
/// Adds a FamilyTypeface to the font family.
/// </summary>
public void Add(FamilyTypeface item)
{
InsertItem(_count, item);
}
/// <summary>
/// Removes all FamilyTypeface objects from the FontFamily.
/// </summary>
public void Clear()
{
ClearItems();
}
/// <summary>
/// Determines whether the FontFamily contains the specified FamilyTypeface.
/// </summary>
public bool Contains(FamilyTypeface item)
{
return FindItem(item) >= 0;
}
/// <summary>
/// Copies the contents of the list to the specified array.
/// </summary>
public void CopyTo(FamilyTypeface[] array, int index)
{
CopyItems(array, index);
}
void SC.ICollection.CopyTo(Array array, int index)
{
CopyItems(array, index);
}
bool SC.ICollection.IsSynchronized
{
get { return false; }
}
object SC.ICollection.SyncRoot
{
get { return this; }
}
/// <summary>
/// Removes the specified FamilyTypeface.
/// </summary>
public bool Remove(FamilyTypeface item)
{
VerifyChangeable();
int i = FindItem(item);
if (i >= 0)
{
RemoveAt(i);
return true;
}
return false;
}
/// <summary>
/// Gets the number of items in the list.
/// </summary>
public int Count
{
get { return _count; }
}
/// <summary>
/// Gets a value indicating whether the FamilyTypeface list can be changed.
/// </summary>
public bool IsReadOnly
{
get { return _innerList != null; }
}
#endregion
#region IList members
/// <summary>
/// Gets the index of the specified FamilyTypeface.
/// </summary>
public int IndexOf(FamilyTypeface item)
{
return FindItem(item);
}
/// <summary>
/// Inserts a FamilyTypeface into the list.
/// </summary>
public void Insert(int index, FamilyTypeface item)
{
InsertItem(index, item);
}
/// <summary>
/// Removes the FamilyTypeface at the specified index.
/// </summary>
public void RemoveAt(int index)
{
RemoveItem(index);
}
/// <summary>
/// Gets or sets the FamilyTypeface at the specified index.
/// </summary>
public FamilyTypeface this[int index]
{
get
{
return GetItem(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 FamilyTypeface) >= 0;
}
int SC.IList.IndexOf(object value)
{
return FindItem(value as FamilyTypeface);
}
void SC.IList.Insert(int index, object item)
{
InsertItem(index, ConvertValue(item));
}
void SC.IList.Remove(object value)
{
VerifyChangeable();
int i = FindItem(value as FamilyTypeface);
if (i >= 0)
RemoveItem(i);
}
bool SC.IList.IsFixedSize
{
get { return IsReadOnly; }
}
object SC.IList.this[int index]
{
get
{
return GetItem(index);
}
set
{
SetItem(index, ConvertValue(value));
}
}
#endregion
#region Internal implementation
private int InsertItem(int index, FamilyTypeface item)
{
if (item == null)
throw new ArgumentNullException("item");
VerifyChangeable();
// Validate the index.
if (index < 0 || index > Count)
throw new ArgumentOutOfRangeException("index");
// We can't have two items with same style, weight, stretch.
if (FindItem(item) >= 0)
throw new ArgumentException(SR.Get(SRID.CompositeFont_DuplicateTypeface));
// Make room for the new item.
if (_items == null)
{
_items = new FamilyTypeface[InitialCapacity];
}
else if (_count == _items.Length)
{
FamilyTypeface[] items = new FamilyTypeface[_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 InitializeItemsFromInnerList()
{
if (_innerList != null && _items == null)
{
// Create the array.
FamilyTypeface[] items = new FamilyTypeface[_count];
// Create a FamilyTypeface for each Typeface in the inner list.
int i = 0;
foreach (Typeface face in _innerList)
{
items[i++] = new FamilyTypeface(face);
}
// For thread-safety, set _items to the fully-initialized array at the end.
_items = items;
}
}
private FamilyTypeface GetItem(int index)
{
RangeCheck(index);
InitializeItemsFromInnerList();
return _items[index];
}
private void SetItem(int index, FamilyTypeface item)
{
if (item == null)
throw new ArgumentNullException("item");
VerifyChangeable();
RangeCheck(index);
_items[index] = item;
}
private void ClearItems()
{
VerifyChangeable();
_count = 0;
_items = null;
}
private void RemoveItem(int index)
{
VerifyChangeable();
RangeCheck(index);
_count--;
for (int i = index; i < _count; ++i)
{
_items[i] = _items[i + 1];
}
_items[_count] = null;
}
private int FindItem(FamilyTypeface item)
{
InitializeItemsFromInnerList();
if (_count != 0 && item != null)
{
for (int i = 0; i < _count; ++i)
{
if (GetItem(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 (_innerList != null)
throw new NotSupportedException(SR.Get(SRID.General_ObjectIsReadOnly));
}
private FamilyTypeface ConvertValue(object obj)
{
if (obj == null)
throw new ArgumentNullException("obj");
FamilyTypeface familyTypeface = obj as FamilyTypeface;
if (familyTypeface == null)
throw new ArgumentException(SR.Get(SRID.CannotConvertType, obj.GetType(), typeof(FamilyTypeface)));
return familyTypeface;
}
private void CopyItems(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)
{
InitializeItemsFromInnerList();
Array.Copy(_items, 0, array, index, _count);
}
}
private class Enumerator : IEnumerator<FamilyTypeface>, SC.IEnumerator
{
FamilyTypefaceCollection _list;
int _index;
FamilyTypeface _current;
internal Enumerator(FamilyTypefaceCollection list)
{
_list = list;
_index = -1;
_current = null;
}
public bool MoveNext()
{
int count = _list.Count;
if (_index < count)
{
_index++;
if (_index < count)
{
_current = _list[_index];
return true;
}
}
_current = null;
return false;
}
void SC.IEnumerator.Reset()
{
_index = -1;
}
public FamilyTypeface 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<T> is not required to.
if (_current == null)
throw new InvalidOperationException(SR.Get(SRID.Enumerator_VerifyContext));
return _current;
}
}
public void Dispose()
{
}
}
#endregion
}
}
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