Do we have events for +/- buttons for serialized list?

[MagicianArtemka]

Hi guys.

I just want to ask if Unity has any events when the user clicks these buttons? If not - maybe anybody knows the way how to hook up these actions?

[adamgolden]

Could do it like this…

using System.Collections.Generic;
using UnityEngine;
public class TestListChangeEvent : MonoBehaviour
{
  private int previousCount = 0;
  public List<int> ints = new List<int>();
  private void OnValidate()
  {
    if (ints.Count != previousCount)
    {
      Debug.Log("change detected: " + ((ints.Count > previousCount) ? "more" : "less") + " items now.");
      previousCount = ints.Count;
    }
  }
}

Edit: To avoid an initial event, could serialize previousCount, or default that to -1, and in OnValidate if it’s -1 just set it to the current count and return instead of checking.

[MagicianArtemka]

@adamgolden

Could do it like this…

using System.Collections.Generic;
using UnityEngine;
public class TestListChangeEvent : MonoBehaviour
{
  private int previousCount = 0;
  public List<int> ints = new List<int>();
  private void OnValidate()
  {
    if (ints.Count != previousCount)
    {
      Debug.Log("change detected: " + ((ints.Count > previousCount) ? "more" : "less") + " items now.");
      previousCount = ints.Count;
    }
  }
}

I love you! (like an old friend, not like I want to have sex with you) Thanks for the help