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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.Runtime.Collections
{
using System.Collections.ObjectModel;
// simple helper class to allow passing in a func that performs validations of
// acceptible values
class ValidatingCollection<T> : Collection<T>
{
public ValidatingCollection()
{
}
public Action<T> OnAddValidationCallback { get; set; }
public Action OnMutateValidationCallback { get; set; }
void OnAdd(T item)
{
if (OnAddValidationCallback != null)
{
OnAddValidationCallback(item);
}
}
void OnMutate()
{
if (OnMutateValidationCallback != null)
{
OnMutateValidationCallback();
}
}
protected override void ClearItems()
{
OnMutate();
base.ClearItems();
}
protected override void InsertItem(int index, T item)
{
OnAdd(item);
base.InsertItem(index, item);
}
protected override void RemoveItem(int index)
{
OnMutate();
base.RemoveItem(index);
}
protected override void SetItem(int index, T item)
{
OnAdd(item);
OnMutate();
base.SetItem(index, item);
}
}
}
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