unity 鼠标拖带

 public void OnBeginDrag(PointerEventData eventData)

public void OnEndDrag(PointerEventData eventData)

public class NewMove : MonoBehaviour,IBeginDragHandler,IEndDragHandler {

    private ScrollRect scrollRect;
    public Toggle[] toggleArr;
    //存储特定的位置坐标
    private float[] pageArr=new float[]{0,0.5f,1.0f};
    public void OnBeginDrag(PointerEventData eventData)
    {
       // Debug.Log("Begin:");
       // Debug.Log(eventData.position);
       //获取rect的初始坐标值
        Vector2 pos = scrollRect.normalizedPosition;
        Debug.Log("Begin:"+pos);
    }
    public void OnEndDrag(PointerEventData eventData)
    {
        //Debug.Log("End:");
        //Debug.Log(eventData.position);
        //获取rect的拖动后的坐标值
        Vector2 pos = scrollRect.normalizedPosition;
        Debug.Log("End:"+pos);
        //获取rect拖动后的水平坐标值
        float posX = scrollRect.horizontalNormalizedPosition;
        int index = 0;
        //计算与特定点的偏差
        float offset = Math.Abs(pageArr[index] - posX);
        //与每一个坐标点进行比较，确定应该存在的位置
        //偏差最小的位置即为rect的位置点
        for(int i=0;i<pageArr.Length;i++)
        {
            float newOffset = Math.Abs(pageArr[i] - posX);
            if(newOffset<= offset)
            {
                index = i;
                offset = newOffset;
            }
        }
        scrollRect.horizontalNormalizedPosition = pageArr[index];
        toggleArr[index].isOn = true;
        Debug.Log("End:" + scrollRect.horizontalNormalizedPosition);
    }