53 lines
2.1 KiB
C#
53 lines
2.1 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using System.Collections.ObjectModel;
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using System.Diagnostics;
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namespace CommunityToolkit.Mvvm.Collections;
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/// <summary>
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/// A read-only observable group. It associates a <see cref="Key"/> to a <see cref="ReadOnlyObservableCollection{T}"/>.
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/// </summary>
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/// <typeparam name="TKey">The type of the group key.</typeparam>
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/// <typeparam name="TElement">The type of elements in the group.</typeparam>
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[DebuggerDisplay("Key = {Key}, Count = {Count}")]
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public sealed class ReadOnlyObservableGroup<TKey, TElement> : ReadOnlyObservableCollection<TElement>, IReadOnlyObservableGroup<TKey, TElement>
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where TKey : notnull
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="ReadOnlyObservableGroup{TKey, TValue}"/> class.
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/// </summary>
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/// <param name="key">The key of the group.</param>
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/// <param name="collection">The collection of items to add in the group.</param>
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/// <exception cref="System.ArgumentNullException">Thrown if <paramref name="key"/> or <paramref name="collection"/> are <see langword="null"/>.</exception>
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public ReadOnlyObservableGroup(TKey key, ObservableCollection<TElement> collection)
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: base(collection)
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{
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ArgumentNullException.For<TKey>.ThrowIfNull(key);
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Key = key;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="ReadOnlyObservableGroup{TKey, TValue}"/> class.
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/// </summary>
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/// <param name="group">The <see cref="ObservableGroup{TKey, TValue}"/> to wrap.</param>
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/// <exception cref="System.ArgumentNullException">Thrown if <paramref name="group"/> is <see langword="null"/>.</exception>
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public ReadOnlyObservableGroup(ObservableGroup<TKey, TElement> group)
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: base(group)
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{
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Key = group.Key;
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}
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/// <inheritdoc/>
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public TKey Key { get; }
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/// <inheritdoc/>
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object IReadOnlyObservableGroup.Key => Key;
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/// <inheritdoc/>
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object? IReadOnlyObservableGroup.this[int index] => this[index];
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}
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