[wxPython-users] Re: Sorted List Control - how?

[Robin Dunn]

Peter Hansen wrote:
> Donn Ingle wrote:
>>> The docs show a SortItems() call that does this.  (Note it doesn't
>>> "maintain" it for you... you just call that method to ensure it is
>>> sorted whenever you want it to be.)
>> Thanks, I dunno how I missed that one. I'll go have another look.
> 
> The interface for wxPython might be non-obvious, especially to a 
> beginner (not sure if you are one or not).  Here's a trivialized example 
> you can probably build on, which should explain what the note about "a 
> callable object" means in the C++ docs:
> 
> Define a sorter class, something like this.  It exists basically so 
> __call__() can be defined for it:
> 
> class _StepSorter(object):
>     '''used in call to ListCtrl.SortItems()'''
>     def __call__(self, a, b):
>         # a and b were set by ListCtrl.SetItemData()
>         return cmp(a, b)

A "callable object" doesn't have to be a class with a __call__ method. 
It is anything that can be called, IOW, any foo for which foo(a,b) is 
possible.


-- 
Robin Dunn
Software Craftsman
http://wxPython.org  Java give you jitters?  Relax with wxPython!