Event that is raised when an object or group of objects in the hierarchy changes.
Actions that trigger this event include creating, renaming, reparenting, or destroying objects in the current hierarchy, as well as loading, unloading, renaming, or reordering loaded Scenes. Note that the event is not raised immediately in response to these actions, but rather during the next update of the editor application.
Actions taken with objects that have HideFlags.HideInHierarchy set will not cause this event to be raised, but changing Object.hideFlags will.
The following example script logs the number of objects to the console whenever the hierarchy changes. Copy it into a file called HierarchyMonitor.cs and put it in a folder called Editor.
using System.Linq; using UnityEditor; using UnityEngine;
[InitializeOnLoadAttribute] public static class HierarchyMonitor { static HierarchyMonitor() { EditorApplication.hierarchyChanged += OnHierarchyChanged; }
static void OnHierarchyChanged() { var all = Resources.FindObjectsOfTypeAll(typeof(GameObject)); var numberVisible = all.Where(obj => (obj.hideFlags & HideFlags.HideInHierarchy) != HideFlags.HideInHierarchy).Count(); Debug.LogFormat("There are currently {0} GameObjects visible in the hierarchy.", numberVisible); } }
See Also: EditorWindow.OnHierarchyChange.
Did you find this page useful? Please give it a rating:
Thanks for rating this page!
What kind of problem would you like to report?
Thanks for letting us know! This page has been marked for review based on your feedback.
If you have time, you can provide more information to help us fix the problem faster.
Provide more information
You've told us this page needs code samples. If you'd like to help us further, you could provide a code sample, or tell us about what kind of code sample you'd like to see:
You've told us there are code samples on this page which don't work. If you know how to fix it, or have something better we could use instead, please let us know:
You've told us there is information missing from this page. Please tell us more about what's missing:
You've told us there is incorrect information on this page. If you know what we should change to make it correct, please tell us:
You've told us this page has unclear or confusing information. Please tell us more about what you found unclear or confusing, or let us know how we could make it clearer:
You've told us there is a spelling or grammar error on this page. Please tell us what's wrong:
You've told us this page has a problem. Please tell us more about what's wrong:
Thank you for helping to make the Unity documentation better!
Your feedback has been submitted as a ticket for our documentation team to review.
We are not able to reply to every ticket submitted.