// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.

namespace WixToolset.WixBA
{
    using System;
    using System.Diagnostics;
    using System.Windows.Input;

    /// <summary>
    /// Base class that implements ICommand interface via delegates.
    /// </summary>
    public class RelayCommand : ICommand
    {
        private readonly Action<object> execute;
        private readonly Predicate<object> canExecute;

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

        public RelayCommand(Action<object> execute, Predicate<object> canExecute)
        {
            this.execute = execute;
            this.canExecute = canExecute;
        }

        public event EventHandler CanExecuteChanged
        {
            add { CommandManager.RequerySuggested += value; }
            remove { CommandManager.RequerySuggested -= value; }
        }

        [DebuggerStepThrough]
        public bool CanExecute(object parameter)
        {
            return this.canExecute == null ? true : this.canExecute(parameter);
        }

        public void Execute(object parameter)
        {
            this.execute(parameter);
        }
    }
}