ReadOnly attribute for Unity

ReadOnly.cs

#if UNITY_EDITOR
using UnityEditor;
using UnityEngine;

namespace Utility
{
    public class ReadOnlyAttribute : PropertyAttribute
    {

    }

    [CustomPropertyDrawer(typeof(ReadOnlyAttribute))]
    public class ReadOnlyDrawer : PropertyDrawer
    {
        public override float GetPropertyHeight(SerializedProperty property,
            GUIContent label)
        {
            return EditorGUI.GetPropertyHeight(property, label, true);
        }

        public override void OnGUI(Rect position,
            SerializedProperty property,
            GUIContent label)
        {
            GUI.enabled = false;
            EditorGUI.PropertyField(position, property, label, true);
            GUI.enabled = true;
        }
    }
}
#endif