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