wxruby users - Oct 2009 - Virtual ListCtrl not sortable by clicking the header?

I just realised, that as soon as I add Wx::LC_VIRTUAL to the style,  
the list stops being sortable by clicking on the header. Are virtual  
lists always unsortable by clicking on the header?

Regards,
Timo

Timo Springmann wrote:
> I just realised, that as soon as I add Wx::LC_VIRTUAL to the style, 
> the list stops being sortable by clicking on the header. Are virtual 
> lists always unsortable by clicking on the header? 
No, they are not unsortable, but you have to do the work yourself. In a 
"normal" ListCtrl, the control has knowledge of all the contents, so
can
help you. In a virtual ListCtrl, it doesn''t know all the contents as
you
supply them on demand.

You need to handle the events for the clicking of the column headers 
yourself (*evt_list_col_click etc)*, and then re-order the contents 
(data to be supplied by the virtual functions). So if you were using a 
SQL call to populate the underlying data, you might add an ORDER BY clause.

This for wxPython, but might be helpful:

http://code.activestate.com/recipes/426407/
http://archives.devshed.com/forums/python-122/sorting-wxlistctrl-with-lc-virtual-2218172.html

alex

Hi Alex,

hey, that''s sound promising. Thanks for pointing me into the right  
direction. I''ll take a deeper look into it. I think it would be  
usefull if this would be part of the documentation?

Regards,
Timo


Am 27.10.2009 um 15:00 schrieb Alex Fenton:
> Timo Springmann wrote:
>> I just realised, that as soon as I add Wx::LC_VIRTUAL to the style,  
>> the list stops being sortable by clicking on the header. Are  
>> virtual lists always unsortable by clicking on the header?
>
> No, they are not unsortable, but you have to do the work yourself.  
> In a "normal" ListCtrl, the control has knowledge of all the  
> contents, so can help you. In a virtual ListCtrl, it doesn''t know
> all the contents as you supply them on demand.
>
> You need to handle the events for the clicking of the column headers  
> yourself (*evt_list_col_click etc)*, and then re-order the contents  
> (data to be supplied by the virtual functions). So if you were using  
> a SQL call to populate the underlying data, you might add an ORDER  
> BY clause.
>
> This for wxPython, but might be helpful:
>
> http://code.activestate.com/recipes/426407/
>
http://archives.devshed.com/forums/python-122/sorting-wxlistctrl-with-lc-virtual-2218172.html
>
> alex
>
>
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