Re: example

[ashley maher <ashley maher didymodesigns com au>]

On Mon, 2005-11-21 at 10:54 +0000, Axel Simon wrote:
> On Mon, 2005-11-21 at 21:31 +1100, ashley maher wrote:
> > G'day,
> >
> > I have followed the gtk tree view tutorial at:
> >
> > http://scentric.net/tutorial/.
> >
> > The tutorial is very good. However section: 3.5 deals with Retrieving
> > row data.
> >
> > This works well for data to stdout.
> >
> > However I can't see in the tutorial, nor has google helped, where to
> > find an example where the callback function does not deal with the data
> > directly but passes the data retrieved back to the main programme.
>
> The example shows the "advanced" version of retrieving data, namely by
> using a call back function. There is nothing that prevents you from
> iterating through the model (with a GtkTreeIter) and call
> gtk_tree_model_get directly on the model. That way you have the data
> where you want it: in your main program.
>
> I hope this is what you've asked for,
> Axel.
Thanks Alex,

It did give me a direction. I think you got two different tutorials
confused. I was referring to gtktree tutorial the advanced data
retrieval is in the gtk tutorial.

Specifically I need to return the value of a cell if and only if a row
has been double clicked.

Hence I've persevered with the call-back functions as suggested by the
gtktree-view tutorial.

So it occurred to me that a properly written c_handler should return the
data required. This has proven not so.

Specifically my attempt:

#define         STRCPY(x) strcpy(malloc(strlen(x)+1), x)
.........
.........
.........
.........
unsigned char   *s1;
.........
.........
.........
.........
g_signal_connect(treeview, "row-activated",
G_CALLBACK(gtree_onSelection), &s1);

return s1;
}


static void
gtree_onSelection (GtkTreeView *treeview, gpointer *data)
{
        GtkTreeSelection        *sel;
        GtkTreeIter             selected_row;   /* the iter I've been looking at */
        GtkTreeModel            *model;
        gchar                   *key;

        sel = gtk_tree_view_get_selection(GTK_TREE_VIEW(treeview));

        g_assert(gtk_tree_selection_get_mode(sel) == GTK_SELECTION_SINGLE);
        
        /* Check if a row is selected or not             */
        /* This will only work in SINGLE or BROWSE mode! */
        if (gtk_tree_selection_get_selected(sel, &model, &selected_row))
        {
                gtk_tree_model_get (model, &selected_row, 0, &key, -1);

                *data = STRCPY(key);

                g_free(key);
        }
        else
        {
                printf ("Something\n\n");
        }
        gtk_main_quit();
}

Just is not getting me anywhere. Hence my question if somebody had a
working example somewhere as I expected it to be a common problem to
solve. I just hadn't come across a working example anywhere.

Of course if I've totally missed the point please feel free to be blunt.

Regards,

Ashley