Add Basic Reworked UI

Data/EnumDropdownBinder.cs

@@ -13,13 +13,16 @@ namespace ADOFAIRenderer.Data
     /// <typeparam name="T">The enum type to bind.</typeparam>
     public class EnumDropdownBinder<T> where T : struct, Enum
     {
-        private readonly DropdownField _dropdown;
+        private readonly DropdownField? _dropdown;
         private readonly List<T> _values;
+        private Action<T>? _onValueChanged;
 
         /// <summary>
         /// The currently selected enum value.
         /// </summary>
-        public T Value => _values[_dropdown.index >= 0 ? _dropdown.index : 0];
+        public T Value => _dropdown != null && _dropdown.index >= 0 && _dropdown.index < _values.Count
+            ? _values[_dropdown.index]
+            : default;
 
         /// <summary>
         /// Queries a <see cref="DropdownField"/> by name from the root VisualElement,
@@ -30,18 +33,24 @@ namespace ADOFAIRenderer.Data
         /// <param name="defaultValue">The initial selected value. Defaults to the first enum member.</param>
         public EnumDropdownBinder(VisualElement rootVisualElement, string fieldName, T? defaultValue = null)
         {
+            _values = Enum.GetValues(typeof(T)).Cast<T>().ToList();
+
             _dropdown = rootVisualElement.Q<DropdownField>(fieldName);
             if (_dropdown == null)
             {
                 Melon<RenderMod>.Logger.Error(
                     $"DropdownField '{fieldName}'을(를) 찾을 수 없습니다.");
-                _values = new List<T>();
                 return;
             }
 
-            _values = Enum.GetValues(typeof(T)).Cast<T>().ToList();
             _dropdown.choices = _values.Select(v => v.ToString()).ToList();
 
+            // Register the callback BEFORE setting index so the initial selection fires it too
+            _dropdown.RegisterValueChangedCallback(_ =>
+            {
+                _onValueChanged?.Invoke(Value);
+            });
+
             var initial = defaultValue ?? _values[0];
             _dropdown.index = _values.IndexOf(initial);
         }
@@ -51,10 +60,13 @@ namespace ADOFAIRenderer.Data
         /// </summary>
         public void OnValueChanged(Action<T> callback)
         {
-            _dropdown?.RegisterValueChangedCallback(evt =>
+            _onValueChanged = callback;
+
+            // Fire immediately with current value so the caller gets the initial state
+            if (_dropdown != null)
             {
                 callback(Value);
-            });
+            }
         }
     }
 }