Detecting moment when GameObiect is created in hierarchy.

Questions & Answers
1

Hi,
I need to know moment when any new GameObject is added to hierarchy (from project window, CtrlD, code etc). I know about EditorApplication.hierarchyWindowChanged but it gives me no informatian what type of change it was. In general i want sth like “SuperHelpfulEditorClass.onGameObiectCreated”. Any ideas?

2

As iabulko suggested, use hierarchWindowChange and keep track of the number of objects.

using UnityEngine;
using UnityEditor;

[InitializeOnLoad]
public class SuperHelpfulEditorClass {

    public delegate void HierarchyChangeAction(GameObject go);
    public static event HierarchyChangeAction onGameObjectCreated;

    static int objectCount = 0;

    static SuperHelpfulEditorClass()
    {
        EditorApplication.hierarchyWindowChanged += OnHierarchyWindowChanged;
    }
        
    static void OnHierarchyWindowChanged () {

        GameObject[] objects = (GameObject[]) Resources.FindObjectsOfTypeAll (typeof (GameObject));

        if (objects.Length > objectCount)
        {
            GameObject go = Selection.activeGameObject;

            if (onGameObjectCreated != null)
                onGameObjectCreated(go);
        }

        objectCount = objects.Length;
    }

}

New GameObjects are selected by default, not sure how reliable this is, so it might have to change. The event can be used like this:

using UnityEngine;
using UnityEditor;

[InitializeOnLoad]
public class ShowCreatedGameObjectName {

    static ShowCreatedGameObjectName()
    {
        SuperHelpfulEditorClass.onGameObjectCreated += OnGameObjectCreated;
    }

    static void OnGameObjectCreated(GameObject go)
    {
        Debug.Log("GameObject was created.

GameObject.name = " + go.name);
}
}