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

// 鼠标移入时图片样式发生改变
public class EnterImageUIChange : MonoBehaviour,IPointerEnterHandler,IPointerExitHandler
{
    private Image image; // 被改变的图片
    /**
     * 移入时只会改变图片的透明度
     * 移出时默认恢复到白色，当有点击按钮时会恢复到点击后的颜色
     */
    public bool changeColor = true; // 是否改变颜色
    private Color enterColor; // 移入颜色
    public Color exitColor=Color.white; // 移出颜色
    
    public bool changeCursor = true; // 是否改变光标
    private Texture2D handCursor;  // 用于存放小手光标图标
    public Vector2 hotSpot = new Vector2(0, 0);  // 设置光标热点

    private void Start()
    {
        image = GetComponent<Image>();
        handCursor = Resources.Load<Texture2D>("Cursor/MouseCursor");
    }

    public void OnPointerEnter(PointerEventData eventData)
    { 
        enterColor = image.color;
        exitColor = image.color;
        enterColor.a = 0.5f;
        if(changeColor)image.color = enterColor;
        if(changeCursor)Cursor.SetCursor(handCursor, hotSpot, CursorMode.Auto);
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        if(changeColor)image.color = exitColor;
        if(changeCursor)Cursor.SetCursor(null, Vector2.zero, CursorMode.Auto);
    }
}