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using System;
using System.Collections;
using System.Collections.Generic;
namespace Xamarin.Forms
{
public class DefinitionCollection<T> : IList<T>, ICollection<T> where T : IDefinition
{
readonly List<T> _internalList = new List<T>();
internal DefinitionCollection()
{
}
public void Add(T item)
{
_internalList.Add(item);
item.SizeChanged += OnItemSizeChanged;
OnItemSizeChanged(this, EventArgs.Empty);
}
public void Clear()
{
foreach (T item in _internalList)
item.SizeChanged -= OnItemSizeChanged;
_internalList.Clear();
OnItemSizeChanged(this, EventArgs.Empty);
}
public bool Contains(T item)
{
return _internalList.Contains(item);
}
public void CopyTo(T[] array, int arrayIndex)
{
_internalList.CopyTo(array, arrayIndex);
}
public int Count
{
get { return _internalList.Count; }
}
public bool IsReadOnly
{
get { return false; }
}
public bool Remove(T item)
{
item.SizeChanged -= OnItemSizeChanged;
bool success = _internalList.Remove(item);
if (success)
OnItemSizeChanged(this, EventArgs.Empty);
return success;
}
IEnumerator IEnumerable.GetEnumerator()
{
return _internalList.GetEnumerator();
}
public IEnumerator<T> GetEnumerator()
{
return _internalList.GetEnumerator();
}
public int IndexOf(T item)
{
return _internalList.IndexOf(item);
}
public void Insert(int index, T item)
{
_internalList.Insert(index, item);
item.SizeChanged += OnItemSizeChanged;
OnItemSizeChanged(this, EventArgs.Empty);
}
public T this[int index]
{
get { return _internalList[index]; }
set
{
_internalList[index] = value;
value.SizeChanged += OnItemSizeChanged;
OnItemSizeChanged(this, EventArgs.Empty);
}
}
public void RemoveAt(int index)
{
T item = _internalList[index];
_internalList.RemoveAt(index);
item.SizeChanged -= OnItemSizeChanged;
OnItemSizeChanged(this, EventArgs.Empty);
}
public event EventHandler ItemSizeChanged;
void OnItemSizeChanged(object sender, EventArgs e)
{
EventHandler eh = ItemSizeChanged;
if (eh != null)
eh(this, EventArgs.Empty);
}
}
}
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