text: # menu.py micro-gui demo of Menu class
  
  # Released under the MIT License (MIT). See LICENSE.
  # Copyright (c) 2021 Peter Hinch
  
  import hardware_setup  # Create a display instance
  from gui.core.ugui import Screen, ssd
  import gui.fonts.freesans20 as font
  from gui.core.writer import CWriter
  
  from gui.widgets.menu import Menu
  from gui.widgets.buttons import CloseButton
  from gui.core.colors import *
  
  class BaseScreen(Screen):
  
      def __init__(self):
          def cb(button, n):
              print('Help callback', n)
  
          def cb_sm(lb, n):
              print('Submenu callback', lb.value(), lb.textvalue(), n)
  
          super().__init__()
          metals2 = (('Gold', cb_sm, (6,)),
                     ('Silver', cb_sm, (7,)),
                     ('Iron', cb_sm, (8,)),
                     ('Zinc', cb_sm, (9,)),
                     ('Copper', cb_sm, (10,)))
  
          gases = (('Helium', cb_sm, (0,)),
                   ('Neon', cb_sm, (1,)),
                   ('Argon', cb_sm, (2,)),
                   ('Krypton', cb_sm, (3,)),
                   ('Xenon', cb_sm, (4,)),
                   ('Radon', cb_sm, (5,)))
  
          metals = (('Lithium', cb_sm, (6,)),
                    ('Sodium', cb_sm, (7,)),
                    ('Potassium', cb_sm, (8,)),
                    ('Rubidium', cb_sm, (9,)),
                    ('More', metals2))
  
          mnu = (('Gas', gases),
                 ('Metal',metals),
                 ('Help', cb, (2,)))
  
          wri = CWriter(ssd, font, GREEN, BLACK, verbose=False)
          Menu(wri, bgcolor=BLUE, textcolor=WHITE, args = mnu)
          CloseButton(wri)
  
  
  Screen.change(BaseScreen)
  