rabidus-test/Assets/Scripts/WheelActivator.cs

using BNG;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;

public class WheelActivator : MonoBehaviour
{
    [SerializeField]
    private List<Grabber> grabbers = new List<Grabber>();

    public UnityEvent OnActivate;
    public UnityEvent OnDeactivate;

    public bool StartActive = false;

    public bool Active = false;

    private void Awake()
    {
        if (StartActive)
            Activate();
        else
            Deactivate();
    }

    private void Activate()
    {
        Active = true;
        OnActivate?.Invoke();
    }

    private void Deactivate()
    {
        Active = false;
        OnDeactivate?.Invoke();
    }

    public void TryActivate(Grabber grabber)
    {
        if (!grabbers.Contains(grabber))
        {
            grabbers.Add(grabber);

            if (grabbers.Count == 2)
            {
                Activate();
            }
        }
    }

    public void TryDeactivate(Grabber grabber)
    {
        if (grabbers.Contains(grabber))
        {
            grabbers.Remove(grabber);
            Deactivate();
        }
    }
}