using UnityEngine.EventSystems;
using UnityEngine;

namespace Level24
{
    public class RawImageCtrl : MonoBehaviour,IDragHandler,IPointerDownHandler,IPointerUpHandler
    {
        [Header("脚本所控制的物体，为空则控制本身")]
        public RectTransform ctrlTrans=null;

        public int mouseButton_Darg = 0;

        private Vector2 mouseClickPos;
        private Vector2 tempDargPos;
        private float scaleValue = 1;
        public float maxScaleValue;
        public float minScaleValue;

        public void OnDrag(PointerEventData eventData)
        {
            if (Input.GetMouseButton(mouseButton_Darg))
            {
                tempDargPos = Input.mousePosition;
                float distanceX = tempDargPos.x - mouseClickPos.x;
                float distanceY = tempDargPos.y - mouseClickPos.y;
                mouseClickPos = tempDargPos;
                if (ctrlTrans == null)
                {
                    this.GetComponent<RectTransform>().position += new Vector3(distanceX,distanceY,0);
                }
                else
                {
                    ctrlTrans.position += new Vector3(distanceX,  distanceY,0);
                }
            }
        }

        public void OnPointerDown(PointerEventData eventData)
        {
            mouseClickPos = Input.mousePosition;

        }

        public void OnPointerUp(PointerEventData eventData)
        {
            mouseClickPos = Vector2.zero;
        }



        // Start is called before the first frame update
        void Start()
        {

        }

        // Update is called once per frame
        void Update()
        {
            if (Input.GetAxis("Mouse ScrollWheel") != 0)
            {
                scaleValue += Input.GetAxis("Mouse ScrollWheel");
                scaleValue = Mathf.Clamp(scaleValue, minScaleValue, maxScaleValue);
                if (ctrlTrans != null)
                {
                    ctrlTrans.transform.localScale = new Vector3(1 * scaleValue, 1 * scaleValue, 1 * scaleValue);
                }
                else
                {
                    this.transform.localScale= new Vector3(1 * scaleValue, 1 * scaleValue, 1 * scaleValue); 
                }
            }
        

        }



    }
}