/* *****************************************************************************
* load and initialize and external module
*/
gboolean nav_init (const gchar *mod_path, const gchar *mod_name)
{
gchar *t_path;
nav_close ();
t_path = g_module_build_path (mod_path, mod_name);
nav_module = g_module_open (t_path, G_MODULE_BIND_LAZY);
if (!nav_module)
{
g_print (_("WARNING: %s\n"), g_module_error ());
return FALSE;
}
if (!g_module_symbol (nav_module, "calculate_route", (gpointer *)&calculate_route))
{
g_print (_("ERROR: %s\n"), g_module_error ());
nav_close ();
return FALSE;
}
if (calculate_route == NULL)
{
g_print (_("ERROR: Missing symbol \"calculate_route\" in navigation module '%s'\n"),
g_module_name (nav_module));
nav_close ();
return FALSE;
}
g_print (_("Navigation module '%s' successfully loaded.\n"), g_module_name (nav_module));
return TRUE;
}
static void
nav_insert_page(navigator_t *nav, nav_page_t *np, prop_t *origin)
{
nav_page_t *np2;
if(prop_set_parent(np->np_prop_root, nav->nav_prop_pages)) {
/* nav->nav_prop_pages is a zombie, this is an error */
abort();
}
if(np->np_inhistory == 0) {
if(nav->nav_page_current != NULL) {
/* Destroy any previous "future" histories,
* this happens if we back a few times and then jumps away
* in another "direction"
*/
while((np2 = TAILQ_NEXT(nav->nav_page_current, np_history_link)) != NULL)
nav_close(np2, 1);
}
TAILQ_INSERT_TAIL(&nav->nav_history, np, np_history_link);
np->np_inhistory = 1;
}
nav_select(nav, np, origin);
}
static void
nav_close_all(navigator_t *nav, int with_prop)
{
nav_page_t *np;
while((np = TAILQ_LAST(&nav->nav_pages, nav_page_queue)) != NULL)
nav_close(np, with_prop);
}
static void
nav_back(navigator_t *nav)
{
nav_page_t *prev, *np = nav->nav_page_current;
if(np != NULL &&
(prev = TAILQ_PREV(np, nav_page_queue, np_history_link)) != NULL) {
nav_select(nav, prev, NULL);
if(np->np_direct_close)
nav_close(np, 1);
}
}
static void
nav_page_close_set(void *opaque, int value)
{
nav_page_t *np = opaque, *np2;
navigator_t *nav = np->np_nav;
if(!value)
return;
if(nav->nav_page_current == np) {
np2 = TAILQ_PREV(np, nav_page_queue, np_history_link);
nav_select(nav, np2, NULL);
}
nav_close(np, 1);
}
