FocusOnLoadedBehavior.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 FocusOnLoadedBehavior : Behavior<FrameworkElement>
    {
        public static readonly DependencyProperty IsEnabledProperty =
            DependencyProperty.RegisterAttached(
                "IsEnabled",
                typeof(bool),
                typeof(FocusOnLoadedBehavior),
                new PropertyMetadata(false, OnIsEnabledChanged));

        public static bool GetIsEnabled(DependencyObject obj)
        {
            return (bool)obj.GetValue(IsEnabledProperty);
        }

        public static void SetIsEnabled(DependencyObject obj, bool value)
        {
            obj.SetValue(IsEnabledProperty, value);
        }

        private static void OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is FrameworkElement element && (bool)e.NewValue)
            {
                // Loaded 이벤트가 중복 연결되지 않도록 방지
                element.Loaded -= OnElementLoaded;
                element.Loaded += OnElementLoaded;
            }
        }

        private static void OnElementLoaded(object sender, RoutedEventArgs e)
        {
            if (sender is FrameworkElement element)
            {
                element.Loaded -= OnElementLoaded;
 
                // 포커스를 이동할 수 있는 경우에만 처리
                if (element.Focusable && element.IsEnabled && element.Visibility == Visibility.Visible)
                {
                    element.Focus();
                    Keyboard.Focus(element);
                }
            }
        }
 
    }
}