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44 lines
1.3 KiB
C#
44 lines
1.3 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;
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using System.Windows.Input;
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namespace CommunityToolkit.Mvvm.Input.Internals;
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/// <summary>
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/// A reusable <see cref="ICommand"/> instance that is always disabled.
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/// </summary>
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internal sealed class DisabledCommand : ICommand
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{
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/// <inheritdoc/>
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public event EventHandler? CanExecuteChanged
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{
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add { }
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remove { }
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}
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/// <summary>
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/// Gets a shared, reusable <see cref="DisabledCommand"/> instance.
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/// </summary>
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/// <remarks>
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/// This instance can safely be used across multiple objects without having
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/// to worry about this static keeping others alive, as the event uses a
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/// custom accessor that just discards items (as the event is known to never
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/// be raised). As such, this instance will never act as root for other objects.
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/// </remarks>
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public static DisabledCommand Instance { get; } = new();
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/// <inheritdoc/>
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public bool CanExecute(object? parameter)
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{
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return false;
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}
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/// <inheritdoc/>
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public void Execute(object? parameter)
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{
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}
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}
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