using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;

namespace StammGenerator.ViewModel
{
    [Serializable]
    class RelayCommand : ICommand
    {
        #region Fields
        private readonly Action<object> execute;
        private readonly Predicate<object> canExecute;
        #endregion

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

        public RelayCommand(Action<object> execute, Predicate<object> canExecute)
        {
            if (execute == null) throw new ArgumentNullException("execute");
            this.execute = execute;
            this.canExecute = canExecute;
        }
        #endregion

        #region ICommand Members
        [DebuggerStepThrough]
        public bool CanExecute(object parameter)
        {
            if (canExecute == null) return true;
            return canExecute(parameter);
        }

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

        public void Execute(object parameter)
        {
            execute(parameter);
        }
        #endregion
    }
}
