scroll bars and sorted tree views

[James Pelletier <jamesp trdlnk com>]

I'm having trouble getting the vertical scroll bar of a sorted tree view 
to clamp to the top while adding new data. When the slider is at the top 
I want the slider to stay at the top after the new data is added. When 
the slider is not at the top, it should stay where it is after the new 
data is added. (Basically I want it to act like Mozilla Mail sorted by 
descending date.) I've tried playing with the "changed" and 
"value-changed" callbacks of the adjustment, but I haven't gotten 
anything to work properly.

Any advice?

James

Below is the code that I used to emulate adding dynamic data to the tree 
view.

#include <gtk/gtk.h>

struct info {
    GtkTreeStore *store;
    int val;
};

gboolean addval( gpointer data )
{
    struct info *i = (struct info *)data;
    GtkTreeIter iter;

    gtk_tree_store_append( i->store, &iter, NULL );

    gtk_tree_store_set( i->store, &iter, 0, i->val, -1 );

    if( i->val < 50 )
    {
	i->val += 1;
	return TRUE;
    }

    return FALSE;
}

int main( int argc, char **argv )
{
    GtkWidget *window;
    GtkScrolledWindow *scroll;
    GtkTreeStore *store;
    GtkTreeView *view;
    struct info i;

    gtk_init( &argc, &argv );

    window = gtk_window_new( GTK_WINDOW_TOPLEVEL );
    g_signal_connect( G_OBJECT(window), "delete_event",
	G_CALLBACK(gtk_main_quit), NULL );

    scroll = GTK_SCROLLED_WINDOW( gtk_scrolled_window_new(NULL, NULL) );

    store = gtk_tree_store_new( 1, G_TYPE_INT );

    view = gtk_tree_view_new_with_model(store);

    gtk_tree_view_insert_column_with_attributes( view, 0, "Value",
	gtk_cell_renderer_text_new(), "text", 0, NULL );

    gtk_tree_sortable_set_sort_column_id( store, 0, GTK_SORT_DESCENDING );

    gtk_container_add( scroll, view );
    gtk_container_add( window, scroll );

    i.store = store;
    i.val = 0;

    gtk_timeout_add( 2000, addval, &i );

    gtk_widget_show_all( window );

    gtk_main();

    return 0;
}