Box

using UnityEngine;
using UnityEngine.EventSystems;

public abstract class Box : MonoBehaviour
{
    protected BoxSpawner Spawner;

    private void Awake()
    {
        var eventTrigger = GetComponent<EventTrigger>();
        EventTrigger.Entry pointerDownEntry = eventTrigger.triggers.Find(entry => entry.eventID == EventTriggerType.PointerDown);
        pointerDownEntry.callback.AddListener(OnPointerDown);
    }

    public void Initialize(BoxSpawner spawner) =>
        Spawner = spawner;

    protected abstract void OnPointerDown(BaseEventData eventData);
}