1  // Copyright (c) Microsoft Corporation
 2  // The Microsoft Corporation licenses this file to you under the MIT license.
 3  // See the LICENSE file in the project root for more information.
 4  
 5  using System;
 6  using System.Windows.Input;
 7  
 8  namespace Microsoft.PowerToys.Settings.UI.Library.ViewModels.Commands
 9  {
10      public class RelayCommand : ICommand
11      {
12          private readonly Action _execute;
13          private readonly Func<bool> _canExecute;
14  
15          public event EventHandler CanExecuteChanged;
16  
17          public RelayCommand(Action execute)
18              : this(execute, null)
19          {
20          }
21  
22          public RelayCommand(Action execute, Func<bool> canExecute)
23          {
24              _execute = execute ?? throw new ArgumentNullException(nameof(execute));
25              _canExecute = canExecute;
26          }
27  
28          public bool CanExecute(object parameter) => _canExecute == null || _canExecute();
29  
30          public void Execute(object parameter) => _execute();
31  
32          public void OnCanExecuteChanged() => CanExecuteChanged?.Invoke(this, EventArgs.Empty);
33      }
34  }