PowerToys/src/core/Microsoft.PowerToys.Settings.UI/Helpers/RelayCommand.cs

using System;
using System.Windows.Input;

namespace Microsoft.PowerToys.Settings.UI.Helpers
{
    public class RelayCommand : ICommand
    {
        private readonly Action execute;

        private readonly Func<bool> canExecute;

        public event EventHandler CanExecuteChanged;

        public RelayCommand(Action execute)
            : this(execute, null)
        {
        }

        public RelayCommand(Action execute, Func<bool> canExecute)
        {
            this.execute = execute ?? throw new ArgumentNullException(nameof(execute));
            this.canExecute = canExecute;
        }

        public bool CanExecute(object parameter) => this.canExecute == null || this.canExecute();

        public void Execute(object parameter) => this.execute();

        public void OnCanExecuteChanged() => this.CanExecuteChanged?.Invoke(this, EventArgs.Empty);
    }

    public class RelayCommand<T> : ICommand
    {
        private readonly Action<T> execute;

        private readonly Func<T, bool> canExecute;

        public event EventHandler CanExecuteChanged;

        public RelayCommand(Action<T> execute)
            : this(execute, null)
        {
        }

        public RelayCommand(Action<T> execute, Func<T, bool> canExecute)
        {
            this.execute = execute ?? throw new ArgumentNullException(nameof(execute));
            this.canExecute = canExecute;
        }

        public bool CanExecute(object parameter) => this.canExecute == null || this.canExecute((T)parameter);

        public void Execute(object parameter) => this.execute((T)parameter);

        public void OnCanExecuteChanged() => this.CanExecuteChanged?.Invoke(this, EventArgs.Empty);
    }
}