Re: A Question about GtkTreeSortable

[Iago Rubio <iago iagorubio com>]

On Thu, 2005-10-20 at 19:06 +0800, searun wrote:
> Hi ,
>
> Now i want to use GtkTreeSortable to sort a list. The first entry in the
> gtk_tree_view is an information entry which needn't to be sorted, so i don't
> want the GtkTreeIterCompareFunc function use the first entry. In my programe
> i check GtkTreeIter, if it is the same as the first iter, the
> GtkTreeIterCompareFunc will return 0.

How are you comparing those iters ?

> BUT it can't work. After two day's debug, i can't find the reason.
>
> Any help is appreciated, even if you have another good method.

Try to compare the paths with gtk_tree_path_compare() instead of
comparing the iters. I don't know a generic function to compare iters.

gint       
your_tree_iter_compare_func  (GtkTreeModel *model,
                              GtkTreeIter *a,
                              GtkTreeIter *b,
                              gpointer user_data)
{
GtkTreePath* path_first;
GtkTreePath* path_a;
GtkTreePath* path_b;

first_path = gtk_tree_path_new_first();
path_a = gtk_tree_model_get_path (model,a);
path_b = gtk_tree_model_get_path (model,b);

if( gtk_tree_path_compare(path_first, path_a) == 0 ){
        return -1; // "a" is first so "a" always sorts before
}else if ( gtk_tree_path_compare(path_first, path_b) == 0 ){
        return 1;  // "b" is first so "a" always sorts after
}

// none of both are first so compare them 

.....

gtk_tree_path_free(path_first);
gtk_tree_path_free(path_a);
gtk_tree_path_free(path_b);
}
-- 
Iago Rubio