1.RelayCommon.cs
using System.Windows.Input;
namespace PrimalEditor.Common
{
public class RelayCommand<T> : ICommand
{
private readonly Action<T> _execute;
private readonly Predicate<T> _canExecute;
public event EventHandler CanExecuteChanged
{
add { CommandManager.RequerySuggested += value; }
remove { CommandManager.RequerySuggested -= value; }
}
public bool CanExecute(object parameter)
{
return _canExecute?.Invoke((T)parameter) ?? true;
}
public void Execute(object parameter)
{
_execute((T)parameter);
}
public RelayCommand(Action<T> execute, Predicate<T> canExecute = null)
{
_execute = execute ?? throw new ArgumentNullException(nameof(execute));
_canExecute = canExecute;
}
}
}