using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

public class OnScrollPanel : MonoBehaviour, IScrollHandler
{
    public float width;
    public float height;
    public float minMultiple;
    public float maxMultiple;
    public void OnScroll(PointerEventData eventData)
    {
        var step = GetComponent<RectTransform>().sizeDelta * eventData.scrollDelta.y * 0.1f;
        var sizeDelta = GetComponent<RectTransform>().sizeDelta + step;
        if (sizeDelta.x / width > minMultiple && sizeDelta.x / width < maxMultiple)//因为长宽是同比例缩放，所以只判断长即可
        {
            GetComponent<RectTransform>().sizeDelta += step;
        }       
    }

    // Use this for initialization
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {

    }
    public void SetSize(Texture2D texture)
    {     
        width = texture.width;
        height = texture.height;
        GetComponent<RectTransform>().sizeDelta = new Vector2(width, height);
    }
}