Re: GtkListStore: forcing a sort

[Mattperry <guy somewhere fscked org>]

Thus spake Owen Taylor (otaylor redhat com):

> On Sat, 2003-04-12 at 04:32, Mattperry wrote:
> > I have looked through the API reference and mailing lists, and I can't
> > seem to find an answer to this somewhat simple question.  I have a
> > GtkTreeView which uses a GtkListStore model.  The list store is
> > populated with a struct (ie, store = gtk_list_store_new(1, G_TYPE_POINTER);
> > I add many columns and use gtk_tree_view_column_set_cell_data_func() to
> > display various records of my structure in the columns in different
> > ways.  Now, this works very well, as I only have one copy of the data,
> > and any change takes effect immediately.  However, I would like to sort
> > the list after any change has been made to the data.
> >
> > I have found the automatic sorting features unsatisfactory for two
> > reasons.  First, I need to sort based on 2 columns simultaneously (one
> > has priority), and it doesn't seem like I can do this.  Second, I want
> > to be able to issue a sort command whenever I want, rather than wait for
> > the user to click on the title of one of the columns.  It seems like
> > such a sort function would be fairly standard.  Where can I find this
> > functionality?
>
> Note that, if a list store has a sort function, it's _always_ sorted;
> there is no concept of sorting it.
>
> gtk_tree_sortable_set_sort_func() and
> gtk_tree_sortable_set_default_sort_func() let you sort with whatever
> functions you want.
>
> Regards,
>                                         Owen

I'm using gtk_tree_sortable_set_default_sort_func(), but I notice my
sort function is never called.  My sort function looks like this:

gint list_cmp(GtkTreeModel *model, GtkTreeIter *a, GtkTreeIter *b, gpointer d)
{
    struct sound_entry *entry1, *entry2;

    gtk_tree_model_get(model, a, DATA_COL, &entry1, -1);
    gtk_tree_model_get(model, b, DATA_COL, &entry2, -1);

    g_warning("sort");

    return sound_cmp(entry1, entry2);
}

"sort" never gets printed, and my list never gets sorted.  Also, I don't
see how it's possible that the list store is always sorted if my data
changes independently of my list store.  I have a function like this:
    gtk_list_store_set(store, iter, DATA_COL, entry, -1);
and then function renderers to render the different columns of this
entry.  If I change entry->name, for example, how is the list store to
notice this?  How can I tell it that it needs to be sorted?  As it
stands, using ..._set_default_sort_func() results in my sort function
never being called (regardles of whether I set the sort_column_id to the
DEFAULT_SORT_COLUMN_ID).  Is this a bug?

--
const char* mattPerry = "mjperry2 uiuc edu";

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