[PATCH 2/2] comctl32/listbox: Implement LBS_NODATA

[Gabriel Ivăncescu]

On Mon, Nov 19, 2018 at 8:10 PM Nikolay Sivov <nsivov at codeweavers.com> wrote:
>
> On 11/19/18 6:33 PM, Gabriel Ivăncescu wrote:
>
> > I forgot to mention: besides the bug report, a real life use case at
> > least for single-selection listboxes is Wine's own autocomplete
> > implementation in the very near future.
> >
> > I plan to convert it to use LBS_NODATA (once it's implemented) for a
> > 40% performance gain on large suggestions, so that it is much more
> > manageable on a large enumeration (virtual database fs for instance).
> >
> > Obviously it has to be implemented first or there's no point at all.
> > (and yes, the "special cases" everywhere needs to remain for
> > single-selection listboxes)
>
> Is this listbox window accessible by some API? If it's visible to
> application in any way you should check first that it's actually using
> this style.
>

Nah it's internal and there's no (public) way to get its HWND. There's
APIs to get the selected item and such but those can be easily
converted as well. I don't even know if Windows uses a listbox to be
honest. So it doesn't matter. :-)