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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);
}
}
}
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