docs: def button_pressed(self, key_code, prefix=None):
          """
          Called from the controller classes to update the state of this button manager when a button is pressed.
  
          :internal:
  
          :param key_code:
              The code specified when populating Button instances
          :param prefix:
              Applied to key code if present
          """
          if prefix is not None:
              state = self.buttons_by_code.get(prefix + str(key_code))
          else:
              state = self.buttons_by_code.get(key_code)
          if state is not None:
              for handler in state.button_handlers:
                  handler(state.button)
              state.is_pressed = True
              state.last_pressed = time()
              state.was_pressed_since_last_check = True
          else:
              logger.debug('Unknown button code {} ({})'.format(key_code, prefix))