PointerEvent.cs

public struct PointerEvent : IComponentData
{
    public Entity Entity;
    public PointerEventType EventType;

    public PointerEvent(Entity entity, PointerEventType eventType)
    {
        Entity = entity;
        EventType = eventType;
    }
}

public enum PointerEventType
{
    Enter,
    Exit,
    Down,
    Up,
    Click,
    Drag,
}