Can be used to ensure repaint of the HierarchyWindow.
Use EditorApplication.RepaintHierarchyWindow to refresh the Hierarchy window when changes to GameObjects, such as names, icons, or tags, are not automatically reflected in the Hierarchy window. EditorApplication.RepaintHierarchyWindow can be useful when it is used with custom Editor tools or extensions that dynamically alter GameObject properties. Avoid frequent calls in a performance-critical context, because EditorApplication.RepaintHierarchyWindow might negatively affect Editor performance. This method must be used in the Unity Editor and it requires the UnityEditor namespace. Typically, you combine it with EditorApplication.hierarchyChanged or custom events to ensure UI consistency. Not applicable at runtime since it’s Editor-only. Additional resources: HierarchyWindowItemCallback, EditorApplication.hierarchyWindowItemOnGUI.
using UnityEditor;
using UnityEngine;
[InitializeOnLoad]
public class CustomHierarchyStyling
{
static CustomHierarchyStyling()
{
// Register a callback to draw custom icons in the Hierarchy.
EditorApplication.hierarchyWindowItemOnGUI += OnHierarchyGUI;
// Repaint the Hierarchy window when the tag changes to reflect icon updates
EditorApplication.hierarchyChanged += () => EditorApplication.RepaintHierarchyWindow();
}
static void OnHierarchyGUI(int instanceID, Rect selectionRect)
{
GameObject obj = EditorUtility.InstanceIDToObject(instanceID) as GameObject;
//Add a tag named "Special" to the GameObject to display the custom icon
if (obj != null && obj.CompareTag("Special"))
{
// Draw a custom icon on the left side of the GameObject in the Hierarchy
Rect iconRect = new Rect(selectionRect.x - 20, selectionRect.y, 18, 18);
GUI.Label(iconRect, EditorGUIUtility.IconContent("d_Favorite"));
}
}
}