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

public class EventTriggerListener : MonoBehaviour, IPointerClickHandler, IPointerDownHandler, IPointerEnterHandler, IPointerExitHandler, IPointerUpHandler, IDragHandler, IEndDragHandler
{
    public delegate void VoidDelegate(PointerEventData eventData);
    public VoidDelegate onClick;
    public VoidDelegate onDown;
    public VoidDelegate onEnter;
    public VoidDelegate onExit;
    public VoidDelegate onUp;
    public VoidDelegate onMove;
    public VoidDelegate onMoveEnd;
    static public EventTriggerListener Get(GameObject go)
    {
        EventTriggerListener listener = go.GetComponent<EventTriggerListener>();
        if (listener == null) listener = go.AddComponent<EventTriggerListener>();
        return listener;
    }
    //当鼠标抬起时调用__按下抬起在同一物体上
    public void OnPointerClick(PointerEventData eventData)
    {
        if (onClick != null) onClick(eventData);
    }
    //当鼠标按下时调用
    public void OnPointerDown(PointerEventData eventData)
    {
        if (onDown != null) onDown(eventData);
    }
    //当鼠标进入时调用
    public void OnPointerEnter(PointerEventData eventData)
    {
        if (onEnter != null) onEnter(eventData);
    }
    //当鼠标退出时调用
    public void OnPointerExit(PointerEventData eventData)
    {
        if (onExit != null) onExit(eventData);
    }
    //当鼠标抬起时调用
    public void OnPointerUp(PointerEventData eventData)
    {
        if (onUp != null) onUp(eventData);
    }
    //当鼠标拖动时调用
    public void OnDrag(PointerEventData eventData)
    {
        if (onMove != null) onMove(eventData);
    }
    //当鼠标结束拖动时调用
    public void OnEndDrag(PointerEventData eventData)
    {
        if (onMoveEnd != null) onMoveEnd(eventData);
    }
}
//***********************
//这是一个静态类，用委托来传递你想要的事件。比如你再某个类中要监听你的 YourButton。
//EventTriggerListener.Get(YourButton).onClick = onClickButtonHandler;
//private void onClickButtonHandler(PointerEventData eventData)
//{
//    Debug.log("点击到了你的按钮");
//}