+ wxCHECK_RET( m_list, wxT("invalid listbox") );
+
+ if (gdk_pointer_is_grabbed () && GTK_WIDGET_HAS_GRAB (m_list))
+ return;
+
+ // terribly efficient
+ const gchar *vadjustment_key = "gtk-vadjustment";
+ guint vadjustment_key_id = g_quark_from_static_string (vadjustment_key);
+
+ GtkAdjustment *adjustment =
+ (GtkAdjustment*) gtk_object_get_data_by_id (GTK_OBJECT (m_list), vadjustment_key_id);
+ wxCHECK_RET( adjustment, wxT("invalid listbox code") );
+
+ GList *target = g_list_nth( m_list->children, n );
+ wxCHECK_RET( target, wxT("invalid listbox index") );
+
+ GtkWidget *item = GTK_WIDGET(target->data);
+ wxCHECK_RET( item, wxT("invalid listbox code") );
+
+ // find the last item before this one which is already realized
+ size_t nItemsBefore;
+ for ( nItemsBefore = 0; item && (item->allocation.y == -1); nItemsBefore++ )
+ {
+ target = target->prev;
+ if ( !target )
+ {
+ // nothing we can do if there are no allocated items yet
+ return;
+ }
+
+ item = GTK_WIDGET(target->data);
+ }
+
+ gtk_adjustment_set_value(adjustment,
+ item->allocation.y +
+ nItemsBefore*item->allocation.height);