Implement SubclassSelectorAttribute.UseToStringAsLabel

Author: mackysoft

Assets/Example/Example.cs

@@ -64,7 +64,7 @@ public class Example : MonoBehaviour
 	[SerializeReference]
 	public Food food3 = new Grape();
 
-	[SerializeReference, SubclassSelector]
+	[SerializeReference, SubclassSelector(UseToStringAsLabel = true)]
 	public Food foodOne = new Apple();
 
 	[SerializeReference, SubclassSelector]

Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/SubclassSelectorDrawer.cs

@@ -42,6 +42,19 @@ public override void OnGUI (Rect position, SerializedProperty property, GUIConte
 				foldoutLabelRect = EditorGUI.IndentedRect(foldoutLabelRect);
 				Rect popupPosition = EditorGUI.PrefixLabel(foldoutLabelRect, label);
 
+#if UNITY_2021_3_OR_NEWER
+				// Override the label text with the ToString() of the managed reference.
+				var subclassSelectorAttribute = (SubclassSelectorAttribute)attribute;
+				if (subclassSelectorAttribute.UseToStringAsLabel && !property.hasMultipleDifferentValues)
+				{
+					object managedReferenceValue = property.managedReferenceValue;
+					if (managedReferenceValue != null)
+					{
+						label.text = managedReferenceValue.ToString();
+					}
+				}
+#endif
+
 				// Draw the subclass selector popup.
 				if (EditorGUI.DropdownButton(popupPosition, GetTypeName(property), FocusType.Keyboard))
 				{

Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Runtime/SubclassSelectorAttribute.cs

@@ -4,7 +4,13 @@
 /// <summary>
 /// Attribute to specify the type of the field serialized by the SerializeReference attribute in the inspector.
 /// </summary>
-[AttributeUsage(AttributeTargets.Field,AllowMultiple = false)]
-public sealed class SubclassSelectorAttribute : PropertyAttribute {
-	
+[AttributeUsage(AttributeTargets.Field, AllowMultiple = false)]
+public sealed class SubclassSelectorAttribute : PropertyAttribute
+{
+
+#if UNITY_2021_3_OR_NEWER
+	// NOTE: Use managedReferenceValue getter to invoke instance method in SubclassSelectorDrawer.
+	public bool UseToStringAsLabel { get; set; }
+#endif
+
 }