subclassing from Pmw.ScrolledListBox drops the scroll bar

[Abel Daniel]

This might be a bit dated, but I hit the same problem, and I think at
least the archives (and groups.google.com) should have the solution in
case somebody needs it later.

Joshua Gerth (hrakaroo at yahoo.com) wrote:
> 
> Hello,
> 
>   I've been searching the archives for a while and the Pmw 'known
> bugs' page so I hope this is not an old question.
> 
>   I am attempting to subclass the Pmw.ScrolledListBox widget as I want
> to make a few changes.  However, when I create an instance of my
> subclass it no longer has its scroll bars.  I am using Python 2.2.2
> and Pmw 1.1 on Linux.  If anyone has any suggestions or information I
> would be most greatful.  At the bottom is my example which
> demonstrates this problem.
> 
> Thanks,  
>    Joshua
> 
> ------------------------------------
> #!/usr/bin/env python
> 
> from Tkinter import *
> import Pmw
> 
> class mylistbox(Pmw.ScrolledListBox):
>     def __init__(self,parent=None,**kw):
> 
>         self.defineoptions(kw, ())
>         Pmw.ScrolledListBox.__init__(self,parent)
          self.initialiseoptions(mylistbox)
> 
> root = Pmw.initialise()
> 
> items = ('dog','cat','pig','horse','cow','donkey','chicken','goat',
>          'dog','cat','pig','horse','cow','donkey','chicken','goat')
> 
> Pmw.ScrolledListBox(root, items=items).pack()
> 
> mylistbox(root, items=items).pack()
> 
> root.mainloop()
You left that out. From the docs (emphasis mine): 

 initialiseoptions(myClass)
     Check keyword arguments and call option callback functions. This
     must be called at the end of a megawidget constructor with myClass
     ^^^^
     set to the class being defined.

abli
abli at freemail.hu