#if UNITY_EDITOR

using UnityEditor;
using UnityEngine;

namespace WF.Utillty.UtilSerializeTest
{
    public class SampleUtilWindow : EditorWindow
    {
        public SubUtil sub;

        private void OnEnable()
        {
            Debug.LogFormat("OnEnable: sub = {0}", sub != null ? "" + sub.GetInstanceID() : "null");
            if (sub == null)
            {
                sub = CreateInstance<SubUtil>();
            }
        }

        private void OnDisable()
        {
            sub = null; // この1行を実行すると正常、コメントアウトすると異常
        }

        private void OnGUI()
        {
            if (sub != null)
            {
                sub.OnGUI(); // OnDisableでnullを代入しないと実行されない
            }
        }

        [MenuItem("Tools/whiteflare/Sandbox/Sample Utility")]
        public static void ShowWindow()
        {
            GetWindow<SampleUtilWindow>("Sample Utility");
        }
    }

    public class SubUtil : ScriptableObject
    {
        private void OnEnable()
        {
            Debug.LogFormat("SubUtil.OnEnable: {0}", GetInstanceID());
        }

        private void OnDisable()
        {
            Debug.LogFormat("SubUtil.OnDisable: {0}", GetInstanceID());
        }

        public void OnGUI()
        {
            GUILayout.Label("SubUtil.OnGUI: " + GetInstanceID());
        }
    }
}

#endif