Unity - Scripting API: EditorWindow.CreateGUI()

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Description

CreateGUI is called when the EditorWindow's rootVisualElement is ready to be populated.

Use CreateGUI to add UI Toolkit UI elements to your window.

When creating a custom Editor window, follow these guidelines:

Put code dependent on UXML/USS loading in the CreateGUI method to ensure that all necessary assets are available.
Keep the event registration code inside CreateGUI or after CreateGUI is called.

// The window appears in front of the Editor.
// The window shows the type of a Unity object the cursor is over.

using UnityEngine;
using UnityEditor;
using UnityEngine.UIElements;

public class MouseOverWindowExample : EditorWindow
{
    [MenuItem("Examples/Mouse Over Example")]
    static void Init()
    {
        GetWindow<MouseOverWindowExample>("mouseOver");
    }

    Label m_Label;

    void CreateGUI()
    {
        m_Label = new Label();
        rootVisualElement.Add(m_Label);
    }

    void Update()
    {
        EditorWindow window = EditorWindow.mouseOverWindow;
        if (window != null)
            Debug.Log(window.ToString());
        string windowName = window != null ? window.ToString() : "(none)";
        m_Label.text = $"Mouse over: {windowName}";
    }
}