parameters: (self)
docstring: placeholder so that using class can define a callable
      for when the state of the stacks changes (e.g. for updating the
      enable state of menu items or buttons
docstring_summary: placeholder so that using class can define a callable
      for when the state of the stacks changes (e.g. for updating the
      enable state of menu items or buttons
docstring_tokens: placeholder so that using class can define a callable for when the state of the stacks changes ( e . g . for updating the enable state of menu items or buttons
function: def defaultStateChangedCallback(self):
      """placeholder so that using class can define a callable
      for when the state of the stacks changes (e.g. for updating the
      enable state of menu items or buttons"""
      pass
function_tokens: def defaultStateChangedCallback ( self ) : pass