PointerPublisherBehaviour.cs

using Unity.Entities;
using UnityEngine;
using UnityEngine.EventSystems;

public class PointerPublisherBehaviour : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler, IPointerDownHandler, IPointerUpHandler, IPointerClickHandler, IDragHandler
{
    public GameObjectEntity gameObjectEntity;

    EntityEventSystem eventSystem;
    EntityEventSystem EventSystem => eventSystem ?? (eventSystem = World.Active.GetExistingManager<EntityEventSystem>());

    public void OnPointerEnter(PointerEventData eventData)
    {
        EntityEventSystem.PublishData(new PointerEvent(gameObjectEntity.Entity, PointerEventType.Enter));
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        EntityEventSystem.PublishData(new PointerEvent(gameObjectEntity.Entity, PointerEventType.Exit));
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        EntityEventSystem.PublishData(new PointerEvent(gameObjectEntity.Entity, PointerEventType.Down));
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        EntityEventSystem.PublishData(new PointerEvent(gameObjectEntity.Entity, PointerEventType.Up));
    }

    public void OnPointerClick(PointerEventData eventData)
    {
        EntityEventSystem.PublishData(new PointerEvent(gameObjectEntity.Entity, PointerEventType.Click));
    }

    public void OnDrag(PointerEventData eventData)
    {
        EntityEventSystem.PublishData(new PointerEvent(gameObjectEntity.Entity, PointerEventType.Drag));
    }
}