ngui  拖动物体的第二个例子里没有和scrollbar

自己写了一个

using UnityEngine;using System.Collections;public class ScrollBar : MonoBehaviour {    public UIScrollBar sb;    public UIDraggableCamera dragCam;    private bool isPressed;    public Transform scrollBarBack;    private Vector3 lastCamPos;	// Use this for initialization	void Start () {        if (sb == null && dragCam == null) {            Debug.Log("not set value");        }        lastCamPos = dragCam.transform.localPosition;        isPressed = false;        //sb.onChange += setScrollvalue;	}		// Update is called once per frame	void Update () {        if (isPressed) {            isPressed = Input.touchCount == 1&&Input.GetMouseButton(0);        }        if (!isPressed)        {            Vector3 nowpos = dragCam.transform.localPosition;            if (lastCamPos != nowpos)            {                float hhh = nowpos.y - lastCamPos.y;                float h = (nowpos - lastCamPos).magnitude*(nowpos.magnitude>lastCamPos.magnitude?-1:1);                float H = h;                Bounds b = NGUIMath.CalculateAbsoluteWidgetBounds(dragCam.rootForBounds);//整个面板的bounds                float hh = b.extents.y * Screen.height * dragCam.scale.y + b.extents.x * Screen.width * dragCam.scale.x;                h = h / hh;                sb.scrollValue += h;                lastCamPos = nowpos;                //Debug.Log("HH/"+H+"   h/"+h+"  hh/"+hhh+" scrollv/"+sb.scrollValue);            }        }	}    void OnPress(bool pressed)    {        isPressed = true;        Debug.Log("On pressed/"+isPressed);        if (enabled && NGUITools.GetActive(gameObject)&&dragCam!=null)        {            dragCam.Press(pressed);        }    }    void OnDrag(Vector2 delta)    {        //Debug.Log("delta/"+delta);        Bounds b = NGUIMath.CalculateAbsoluteWidgetBounds(dragCam.rootForBounds);//整个面板的bounds        float h=scrollBarBack.localScale.y;//scrollbar的高度        float w = scrollBarBack.localScale.x;               delta.y =dragCam.scale.y* (delta.y / h) * b.extents.y * Screen.height ;        delta.x =dragCam.scale.x* (delta.x / w) * b.extents.x * Screen.width;        Debug.Log("panel bounds:" + b + "   scale/" + dragCam.scale+ "  delta/" + delta);                if (enabled && NGUITools.GetActive(gameObject) && dragCam != null)        {            dragCam.Drag(delta*-1);        }    }}