EnterKeyCommandBehavior.cs

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using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using Dreamine.MVVM.Behaviors.Core.Base;
 
namespace Dreamine.MVVM.Behaviors.MVVM
{
    public class EnterKeyCommandBehavior : Behavior<UIElement>
    {
        public static readonly DependencyProperty CommandProperty =
            DependencyProperty.RegisterAttached(
                "Command",
                typeof(ICommand),
                typeof(EnterKeyCommandBehavior),
                new PropertyMetadata(null, OnCommandChanged));

        public static ICommand? GetCommand(DependencyObject obj)
        {
            return (ICommand?)obj.GetValue(CommandProperty);
        }

        public static void SetCommand(DependencyObject obj, ICommand? value)
        {
            obj.SetValue(CommandProperty, value);
        }

        private static void OnCommandChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is UIElement element)
            {
                element.KeyDown -= OnKeyDown;
                element.KeyDown += OnKeyDown;
            }
        }

        private static void OnKeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Enter && sender is DependencyObject obj)
            {
                ICommand? command = GetCommand(obj);
                if (command?.CanExecute(null) == true)
                {
                    command.Execute(null);
                    e.Handled = true;
                }
            }
        }
    }
}