[wxPython-users] Virtual ListCtrl and GetItemData: recursion error

[Wojciech Śmigaj]

Stephen Hansen wrote:
>     It looks as if each call of GetItemData() resulted in a new call of the
>     OnGetItemText() function -- I don't understand why (could it be a
>     bug in  wxWidgets/wxPython?).
> 
[...]
> 
> You can't use GetItemData (or really even SetItemData) because those are 
> meant for accessing the internal store of the normal control.
> 
> You have to do something like:
> 
> class VirtualList(wx.ListCtrl):
>     def __init__(self, parent, id=-1):
>         wx.ListCtrl.__init__(self, parent, id,
>                              style=wx.LC_REPORT | wx.LC_VIRTUAL)
> 
>         # Initialize items
>         ids = [0, 1, 2]
>         self.SetItemCount(len(ids))
>  
>         self._data = {}
> 
>         for n, id in enumerate(ids):
>             self._data[n] = id
> 
>         # Create headers
>         self.InsertColumn(0, "Col 0")
>         self.InsertColumn(1, "Col 1")
> 
>     def OnGetItemText(self, item, col):
>         return self._GetRowFromDatabase(self._data[item])
> 
>    def _GetRowFromDatabase(self, id):
>        return 'foo'
> 
> Etc.

Hi Stephen,

thanks for the answer. I'll follow your suggestion. Initially I thought 
that, despite not holding the text/images etc. for particular items, a 
virtual list should at least offer the possibility to associate the 
integer "data" to be used as the key (which would then stay unchanged if 
the list was resorted etc.).

Best regards,
Wojciech Smigaj