[Haskell] Problem with comboBox

[Duncan Coutts]

On Mon, 2006-08-14 at 20:36 +0200, L. J. wrote:
>  I have send this mail to the gtkhs at haskell.org mailing list. I do not
> know if this list is active, so I reply the mail in this one. If the
> other list is active, I'm sorry.

No problem. :-)

The gtkhs at haskell.org mailing list was for the now defunct GTK+HS
project. The successor project which it looks like you've been using is
Gtk2Hs.

It's mailing lists are listed here:
http://haskell.org/gtk2hs/development/#mailing_lists

So you'd want
gtk2hs-users at lists.sourceforge.net

>  Hi, i'm making my first graphic interface program with Haskell. I use
> Glade and Gtk+2.0. I create an empty comboBox with Glade and I want to
> add items (strings) in run time (by means of the haskell code). I
> tried with the functions 'comboBoxAppendText' and 'comboBoxInsertText'
> (http://haskell.org/gtk2hs/docs/current/Graphics-UI-Gtk-MenuComboToolbar-ComboBox.html#t%3AComboBox)
> but I can not do anything for display the information I want. This
> functions require to work with a comboBox creates with the constructor
> comboBoxNewText (and I think this constructor is not the used by
> Glade).

>  I can create it from Glade?

Sadly not, in Glade it allows you to create a general ComboBox. The
comboBoxNewText convenience functions can only be used in the code, not
from Glade.

> I can do I want by another method?

So there are two things you can do. One is to use the general interface
which means creating your own model which will hold the data you want to
display. If you want to display anything more complex in the combo box
than simple strings then this is the only method to choose.

However I just realised that with the current Gtk2Hs releases we didn't
bind quite enough functions for you to use a non-trivial model with a
ComboBox. We'll fix that for the next release.

So as Piotr suggested, you should create the combobox in code with
comboBoxNewText rather than in glade and then that to the right place in
the gui constructed with glade.

For example:

box <- xmlGetWidget xml castToBox "box1"
combo <- comboBoxNewText
containerAdd box combo
widgetShow combo


I'd like to note that the next release of Gtk2Hs will make it much much
easier to create data models to use with views like the TreeView and
ComboBox.

Duncan