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src/VisualStudio/Core/Def/Utilities/DelegateCommand.cs
43 строки
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Cyrus Najmabadi
Make sealed
26 мар 2025, 22:21
26 мар 2025, 22:21
d99b771
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// Licensed to the .NET Foundation under one or more agreements. // The .NET Foundation licenses this file to you under the MIT license. // See the LICENSE file in the project root for more information. using System; using System.Windows.Input; namespace Microsoft.VisualStudio.LanguageServices.Utilities; internal sealed class DelegateCommand : ICommand { public event EventHandler? CanExecuteChanged; private readonly Func<object, bool> _canExecute; private readonly Action<object> _action; private bool _lastCanExecute; public DelegateCommand(Action<object> action) : this(action, (_) => true) { } public DelegateCommand(Action<object> action, Func<object, bool> canExecute) { _canExecute = canExecute; _action = action; } public bool CanExecute(object parameter) { var canExecute = _canExecute(parameter); if (canExecute != _lastCanExecute) { _lastCanExecute = canExecute; CanExecuteChanged?.Invoke(this, new EventArgs()); } return canExecute; } public void Execute(object parameter) => _action(parameter); }