def load_catalog_from_filename(self, filename):
opened = False
for tvhandler in self._tvhandlers:
if tvhandler.path == get_scanned_path_from_catalog(filename):
self._notebook.set_current_page(self._tvhandlers.
index(tvhandler))
opened = True
if opened is False:
path = get_scanned_path_from_catalog(filename)
tvhandler = TVHandler(self, path)
self._tvhandlers.append(tvhandler)
dbmanager = DBManager(self, tvhandler)
self._dbmanagers.append(dbmanager)
dbmanager.create_connection(filename, path)
dbmanager.set_root_node()
tvhandler.dbmanager = dbmanager
tvhandler.add_to_viewport()
tvhandler.print_output()
