1using System;
 2
 3namespace presentation.windows
 4{
 5    public class SimpleCommand : IObservableCommand
 6    {
 7        Action action = () => {};
 8        Func<bool> predicate;
 9
10        public SimpleCommand(Action action) : this(action, () => true) {}
11
12        public SimpleCommand(Action action, Func<bool> predicate)
13        {
14            this.action = action ?? (() => {});
15            this.predicate = predicate ?? (() => true);
16        }
17
18        public event EventHandler CanExecuteChanged = (o, e) => {};
19
20        public void Execute(object parameter)
21        {
22            action();
23        }
24
25        public bool CanExecute(object parameter)
26        {
27            return predicate();
28        }
29
30        public void notify_observers()
31        {
32            CanExecuteChanged(this, EventArgs.Empty);
33        }
34    }
35}