using UnityEngine;
using UnityEngine.EventSystems;
using Kill.UI.Pages;

namespace Kill.UI.Components
{
    /// <summary>
    /// 下拉刷新触发器：挂到主页 ScrollRect（带 Image 的 Graphic）上，接收 EventSystem
    /// 拖拽事件并转发给 HomePageCtrl。这样在滚动区域内任意位置都可触发下拉刷新。
    /// </summary>
    public class HomePagePullRefreshTrigger : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
    {
        public void OnBeginDrag(PointerEventData eventData)
        {
            var ctrl = HomePageCtrl.Instance;
            if (ctrl != null) ctrl.OnPullRefreshBeginDrag();
        }

        public void OnDrag(PointerEventData eventData)
        {
            var ctrl = HomePageCtrl.Instance;
            if (ctrl != null) ctrl.OnPullRefreshDrag(eventData.delta.y);
        }

        public void OnEndDrag(PointerEventData eventData)
        {
            var ctrl = HomePageCtrl.Instance;
            if (ctrl != null) ctrl.OnPullRefreshEndDrag();
        }
    }
}