1 files changed, 80 insertions, 0 deletions
diff --git a/Xamarin.Forms.Core/Command.cs b/Xamarin.Forms.Core/Command.cs
new file mode 100644
index 00000000..73ae1b08
--- /dev/null
+++ b/Xamarin.Forms.Core/Command.cs
@@ -0,0 +1,80 @@
+using System;
+using System.Windows.Input;
+
+namespace Xamarin.Forms
+{
+	public sealed class Command<T> : Command
+	{
+		public Command(Action<T> execute) : base(o => execute((T)o))
+		{
+			if (execute == null)
+				throw new ArgumentNullException("execute");
+		}
+
+		public Command(Action<T> execute, Func<T, bool> canExecute) : base(o => execute((T)o), o => canExecute((T)o))
+		{
+			if (execute == null)
+				throw new ArgumentNullException("execute");
+			if (canExecute == null)
+				throw new ArgumentNullException("canExecute");
+		}
+	}
+
+	public class Command : ICommand
+	{
+		readonly Func<object, bool> _canExecute;
+		readonly Action<object> _execute;
+
+		public Command(Action<object> execute)
+		{
+			if (execute == null)
+				throw new ArgumentNullException("execute");
+
+			_execute = execute;
+		}
+
+		public Command(Action execute) : this(o => execute())
+		{
+			if (execute == null)
+				throw new ArgumentNullException("execute");
+		}
+
+		public Command(Action<object> execute, Func<object, bool> canExecute) : this(execute)
+		{
+			if (canExecute == null)
+				throw new ArgumentNullException("canExecute");
+
+			_canExecute = canExecute;
+		}
+
+		public Command(Action execute, Func<bool> canExecute) : this(o => execute(), o => canExecute())
+		{
+			if (execute == null)
+				throw new ArgumentNullException("execute");
+			if (canExecute == null)
+				throw new ArgumentNullException("canExecute");
+		}
+
+		public bool CanExecute(object parameter)
+		{
+			if (_canExecute != null)
+				return _canExecute(parameter);
+
+			return true;
+		}
+
+		public event EventHandler CanExecuteChanged;
+
+		public void Execute(object parameter)
+		{
+			_execute(parameter);
+		}
+
+		public void ChangeCanExecute()
+		{
+			EventHandler changed = CanExecuteChanged;
+			if (changed != null)
+				changed(this, EventArgs.Empty);
+		}
+	}
+}
+\ No newline at end of file