PlaceObject

using UnityEngine;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEditor;

public class PlaceObject : EditorWindow
{
    [SerializeField]
    PlaceObjectData m_data;

    [MenuItem("Tools/Place Object")]
    public static void ShowWindow()
    {
        PlaceObject window = (PlaceObject)EditorWindow.GetWindow(typeof(PlaceObject));
        window.title = "Place Object";
    }

    void OnEnable()
    {
        hideFlags = HideFlags.HideAndDontSave;
        if (m_data == null)
        {
            m_data = ScriptableObject.CreateInstance<PlaceObjectData>();
        }

        Init();
    }

    void Init()
    {
        //if (!m_data.m_objects.ContainsKey("default"))
        //{
            //m_data.m_objects.Add("default", new SerializableNestedList<GameObject>());
        //}
    }

    void OnFocus()
    {
        SceneView.onSceneGUIDelegate -= this.OnSceneGUI;
        SceneView.onSceneGUIDelegate += this.OnSceneGUI;
    }

    void OnDestroy()
    {
        SceneView.onSceneGUIDelegate -= this.OnSceneGUI;
    }

    void OnSceneGUI(SceneView sceneView)
    {
    }

    void OnGUI()
    {
        m_data.m_selectedIndex = EditorGUILayout.Popup("Object Group: ", m_data.m_selectedIndex,        m_data.m_objects.Keys.ToArray());
    }
}