鼠标点击UI常用的接口事件记录，并且记录一些基础的功能

因为经常忘记鼠标点击UI接口事件（PS：本人的英语水平太差了，老是记不住，所以记录一下），并且记录一些基础的功能

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

public class MouseClickingImage : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler,
    IPointerClickHandler, IPointerDownHandler, IPointerUpHandler,
    IDragHandler, IEndDragHandler, IBeginDragHandler
{
    
    
    private RectTransform rt;

    private void Start()
    {
    
    
        rt = GetComponent<RectTransform>();
    }

    //接口为：IPointerClickHandler
    //鼠标点击了UI
    public void OnPointerClick(PointerEventData eventData)
    {
    
    
        Debug.Log("鼠标点击了UI");
    }

    //接口为：IPointerDownHandler
    //鼠标按下了UI
    public void OnPointerDown(PointerEventData eventData)
    {
    
    
        Debug.Log("鼠标按下了");
    }

    //接口为：IPointerEnterHandler
    //鼠标进入UI
    public void OnPointerEnter(PointerEventData eventData)
    {
    
    
        switch (eventData.button)
        {
    
    
            case PointerEventData.InputButton.Left:
                //鼠标左键
                break;
            case PointerEventData.InputButton.Right:
                //鼠标右键
                break;
            case PointerEventData.InputButton.Middle:
                //鼠标中键
                break;
            default:
                break;
        }
        Debug.Log("鼠标进入UI");
    }

    //接口为：IPointerExitHandler
    //鼠标退出UI
    public void OnPointerExit(PointerEventData eventData)
    {
    
    
        Debug.Log("鼠标退出UI");
    }

    //接口为：IPointerUpHandler
    //鼠标在UI上抬起来了
    public void OnPointerUp(PointerEventData eventData)
    {
    
    
        Debug.Log("鼠标在UI上抬起来了");
    }

    //接口为：IDragHandler
    //鼠标点击中并且移动了执行的事件
    public void OnDrag(PointerEventData eventData)
    {
    
    
        Debug.Log("鼠标点击中并且移动了");
        rt.position = Input.mousePosition;
    }

    //接口为：IEndDragHandler
    //鼠标点击了，并且移动了，松开鼠标之后，执行一次
    public void OnEndDrag(PointerEventData eventData)
    {
    
    
        Debug.Log("鼠标点击了，并且移动了，松开鼠标之后，执行一次");
        
        GameObject go = eventData.pointerCurrentRaycast.gameObject;
        if (go == null)
        {
    
    
            Debug.Log("此UI没有碰撞到任何UI");
        }
        else
        {
    
    
            Debug.Log("此UI碰撞到的UI的名字为：" + go.name);
        }
        gameObject.GetComponent<Image>().raycastTarget = true;
    }

    //接口为：IBeginDragHandler
    //鼠标点击了，并且移动了的第一帧执行
    public void OnBeginDrag(PointerEventData eventData)
    {
    
    
        Debug.Log("鼠标点击了，并且移动了的第一帧执行");
        gameObject.GetComponent<Image>().raycastTarget = false;
    }
}