// Update is called once per frame
    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            RaycastHit hitInfo;
            target = ReturnClickedObject(out hitInfo);
            if (target != null)
            {
                isDragging = true;

                target.OnDragged(
                    Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0)));
            }
        }

        if (Input.GetMouseButtonUp(0))
        {
            isDragging = false;

            //target?.OnDropped(
            //    Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0)));
        }

        if (isDragging)
        {
            //target?.OnDragStay(
            //    Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0)));
        }
    }