Correct use of EditorApplication.HierarchyWindowItemCallback

Scripting
1

Where can I initialize EditorApplication.hierarchyWindowItem without the user having to explicitly run a script? Like something that runs as Unity starts up, or an attribute that automatically runs a function as unity starts.

I know this is very vague, but I hope someone out there can lend a hand.

Thanks!

2

EditorApplication.hierarchyWindowItem is the type of hierarchyWindowItemOnGUI. It exists to define the signature of the delegates you subscribe to hierarchyWindowItemOnGUI which is define as

public static EditorApplication.HierarchyWindowItemCallback hierarchyWindowItemOnGUI;

So there is no correct use in a strict sense, though you are using it correctly when you use hierarchyWindowItemOnGUI.
Here’s a minimal example:

[InitializeOnLoad]
public class HierarchyStyler {
 
    static HierarchyStyler()
    {
        Debug.Log("Initialized");
        EditorApplication.hierarchyWindowItemOnGUI += hwCallbackDelegate;
    }


    static void hwCallbackDelegate(int _instanceID, Rect _selectionRect)
    {
        Debug.Log("CALLBACK");
    }
}

You should see some heavy printout in the console.

1 Like
3

Thanks :slight_smile: Probably should have posted that I found the solution some time ago :wink: At least this question is answered now for future generations :wink: