net.peeweek.gameplay-ingredients/NaughtyAttributes/Editor/PropertyDrawConditions/ShowIfPropertyDrawCondition.cs

using System.Reflection;
using UnityEditor;

namespace NaughtyAttributes.Editor
{
    [PropertyDrawCondition(typeof(ShowIfAttribute))]
    public class ShowIfPropertyDrawCondition : PropertyDrawCondition
    {
        public override bool CanDrawProperty(SerializedProperty property)
        {
            ShowIfAttribute showIfAttribute = PropertyUtility.GetAttribute<ShowIfAttribute>(property);
            UnityEngine.Object target = PropertyUtility.GetTargetObject(property);

            FieldInfo conditionField = ReflectionUtility.GetField(target, showIfAttribute.ConditionName);
            if (conditionField != null &&
                conditionField.FieldType == typeof(bool))
            {
                return (bool)conditionField.GetValue(target);
            }

            MethodInfo conditionMethod = ReflectionUtility.GetMethod(target, showIfAttribute.ConditionName);
            if (conditionMethod != null &&
                conditionMethod.ReturnType == typeof(bool) &&
                conditionMethod.GetParameters().Length == 0)
            {
                return (bool)conditionMethod.Invoke(target, null);
            }

            string warning = showIfAttribute.GetType().Name + " needs a valid boolean condition field or method name to work";
            EditorDrawUtility.DrawHelpBox(warning, MessageType.Warning, logToConsole: true, context: target);

            return true;
        }
    }
}