// サブウィンドウを開く
        public static MapFrontView WillAppear(MapEditorMain _parent)
        {
            MapFrontView window = (MapFrontView)EditorWindow.GetWindow(typeof(MapFrontView), false);

            window.Show();
            window.minSize = new Vector2(WINDOW_W, WINDOW_H);
            window.SetParent(_parent);
            window.Init();
            return(window);
        }
        void OpenFrontView()
        {
            if (m_frontWindow != null)
            {
                m_frontWindow.Close();
            }

            if (m_frontWindow == null)
            {
                m_frontWindow = MapFrontView.WillAppear(this);
            }

            m_frontWindow.Init();

            AssetDatabase.Refresh();
        }