void ShowRoomList()
        {
            Session session = GameObject.Find("App").GetComponent<App>().Session;
            if (session != null)
            {
                RectTransform rectParent = transform.parent.GetComponent<RectTransform>();
                RectTransform rectTemplate = roomTemplate.GetComponent<RectTransform>();
                RectTransform rectMain = gameObject.GetComponent<RectTransform>();

                float width = rectParent.rect.width;
                float scale = width / rectTemplate.rect.width;
                float height = scale * rectTemplate.rect.height;

               // bool isChange = false;
                foreach (Room room in session.RoomManager.RoomCollection.Values)
                {
                    if (room.RoomListItem != null)
                        continue;
                    //isChange = true;
                    GameObject roomObject = Instantiate(roomTemplate) as GameObject;
                    roomObject.transform.SetParent(gameObject.transform);
                    room.RoomListItem = roomObject;

                    RoomItem roomItem = roomObject.GetComponent<RoomItem>();
                    roomItem.Room = room;
                    items.Add(roomObject);
                }

                //if (isChange)
                {
                    rectMain.offsetMax = new Vector2(0, -rectMain.rect.height + height);
                }
            }
        }