using UnityEngine;
using UnityEngine.EventSystems;
using System.Collections.Generic;
 
public class EventPermeate: MonoBehaviour, IPointerClickHandler, IPointerDownHandler, IPointerUpHandler
{ 
	// 事件穿透对象
	[HideInInspector]
	public GameObject target;
	
    // 监听按下
    public void OnPointerDown(PointerEventData eventData)
    {
        PassEvent(eventData,ExecuteEvents.pointerDownHandler);
    }
 
    // 监听抬起
    public void OnPointerUp(PointerEventData eventData)
    {
        PassEvent(eventData,ExecuteEvents.pointerUpHandler);
    }
 
    // 监听点击
    public void OnPointerClick(PointerEventData eventData)
    {
        PassEvent(eventData,ExecuteEvents.submitHandler);
        PassEvent(eventData,ExecuteEvents.pointerClickHandler);
    }

    // 把事件透下去
    public void  PassEvent<T>(PointerEventData data,ExecuteEvents.EventFunction<T> function)
        where T : IEventSystemHandler
    {
        List<RaycastResult> results = new List<RaycastResult>();
        EventSystem.current.RaycastAll(data, results); 
        GameObject current = data.pointerCurrentRaycast.gameObject ;
        for(int i =0; i< results.Count;i++)
        {
            if(target == results[i].gameObject)
            {
            	// 如果是目标物体，则把事件透传下去，然后break
                ExecuteEvents.Execute(results[i].gameObject, data,function);
                break;
            }
        }
    }
}