Custom transform component part 2-2

    private static bool quaternionFoldout = false;
    private void QuaternionInspector()
    {
        //Additional element to also view the Quaternion rotation values
        quaternionFoldout = EditorGUILayout.Foldout(quaternionFoldout, "Quaternion Rotation:    " + _transform.localRotation.ToString("F3"));
        if (quaternionFoldout)
        {
            EditorGUI.BeginChangeCheck();
            Vector4 qRotation = EditorGUILayout.Vector4Field("Be careful!", QuaternionToVector4(_transform.localRotation));

            if (EditorGUI.EndChangeCheck())
            {
                Undo.RecordObject(_transform, "modify quaternion rotation on " + _transform.name);
                _transform.localRotation = ConvertToQuaternion(qRotation);
            }
        }
    }


    private Quaternion ConvertToQuaternion(Vector4 v4)
    {
        return new Quaternion(v4.x, v4.y, v4.z, v4.w);
    }


    private Vector4 QuaternionToVector4(Quaternion q)
    {
        return new Vector4(q.x, q.y, q.z, q.w);
    }