Re: [gtkmm] Gtk::Combo get_list()->children().clear() howto?

[Jeff Gavin <jeff ezclick net>]

Murray Cumming Comneon com wrote:
> http://bugzilla.gnome.org/show_bug.cgi?id=110206

Thanks,

It's a bug.  Thanks for the URL.

> By the way, for gtkmm 2.2 these are the workarounds that I can think of:
> 1. Remove all the items and add them again. (Removing might need 2.)
> 2. Use GTK+ functions, after using gobj() to get the C instance.

O.K. Cool.  I think this might put me back on track.  I can grab the C 
instance hidden in the Gtk::Combo, use the GTK+ functions to manipulate 
my combo box and then I might be home on time for supper!

Regards,

Jeffrey S. Gavin

> Murray Cumming
> murrayc usa net
> www.murrayc.com 
>
>
> > -----Original Message-----
> > From: Jeff Gavin [mailto:jeff ezclick net] 
> > Sent: Dienstag, 3. Juni 2003 03:15
> > To: gtkmm-list gnome org
> > Subject: [gtkmm] Gtk::Combo get_list()->children().clear() howto?
> >
> >
> > I am using a combo box as a search entry.  As the user types into the 
> > combo box, a database lookup happens, and the top match is 
> > displayed in 
> > the entry.   If the user clicks on the drop-down button, a list of 
> > matching entries is displayed.  Just like your mozilla 
> > browser does when 
> > you type on the address line.
> >
> > I can populate the combo box on the first search, but CANNOT 
> > figure out 
> > how to delete and repopulate the combo box on subsequent searches.
> >
> > I have tried:
> >
> > 	combo->get_list()->children().clear();
> >
> > but this crashes.  It's not clear to me that this is a bug, 
> > or I don't 
> > know how to program it correctly.  The debugger says:
> >
> > Program received signal SIGSEGV, Segmentation fault.
> > [Switching to Thread 1086466976 (LWP 15014)]
> > 0x4012322f in 
> > Gtk::ComboDropDown_Helpers::ComboDropDownList::erase(Glib::Lis
> > t_Iterator<Gtk::ComboDropDownItem>) 
> > (this=0x827f2b8, 
> > position={<List_Iterator_Base<Gtk::ComboDropDownItem>> 
> > = {<No data fields>}, head_ = 0x829c804, node_ = 0x82a4e9c}) at 
> > combo.h:105 in combo.h
> >
> > How do you manage (delete and add) the items in a dynamic 
> > combo box like 
> > this?  Is it possible?  Certainly someone out there does this.
> >
> > I have read the list archives and discovered that MANY people 
> > have had 
> > this problem in the past, but I cannot find any message that posts a 
> > solution, workaround or an example.  All of the examples that 
> > I can find 
> > for Gtk::Combo are static combo boxes.
> >
> > It would be nice if one could simply myCombo->clear(); and 
> > get a fresh 
> > empty combo box to repopulate, but I cannot make this happen. 
> > Any help 
> > would be great!
> >
> > If and when I get this working, I will update the combo 
> > example to show 
> > future gtkmm programmers how to do this.
> >
> > Thanks,
> >
> > Jeffrey S. Gavin
> >
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