# HierarchyView.SourceHierarchyChangedEventHandler

> Delegate type used to handle HierarchyView.SourceHierarchyChanged event.

## Definition

* **Type:** Delegate
* **Namespace:** [Unity.Hierarchy](/engine/6000.6/script-reference/unity/hierarchy.md)
* **Assembly:** UnityEngine.HierarchyModule

```csharp
public delegate void HierarchyView.SourceHierarchyChangedEventHandler(HierarchyView view, Hierarchy hierarchy, HierarchyNodeFlags defaultFlags)
```