Re: New list/tree model questions

[Owen Taylor <otaylor redhat com>]

Havoc Pennington <hp redhat com> writes:

>   if (!gtk_tree_model_get_iter_first (model, &tmp))
>      return FALSE;
>
>   do
>   {
>      gtk_tree_model_get (model, &tmp, column, &this_data, -1);
>      if (this_data == data)
>        {
>            *iter = tmp;
>            return TRUE;
>        }
>    } while (gtk_tree_model_iter_next (model, &tmp));
>
>    return FALSE; /* FALSE return means not found */
> }

As a side note, my current favorite idiom for iterating over
all rows in a model is:

  gboolean valid;

  for (valid = gtk_tree_model_get_iter_first (model, &iter);
       valid;
       valid = gtk_tree_model_iter_next (model, &iter))
    {
      [ Do something with &iter ]
    }

The extra boolean variable lets you avoid having separate start
and termination conditions.

Regards,
                                        Owen

P.S. - or, in avoid-for()-loops style:

 gboolean valid = gtk_tree_model_get_iter_first (model, &iter);
 while (valid)
  {
    [ Do something with iter ]
     valid = gtk_tree_model_iter_next (model, &iter);
  }