416         initialization requiring the form instance. Do nothing by default.

   416         initialization requiring the form instance. Do nothing by default.

   417         """

   417         """

   418         pass

   418         pass

   419 

   419 

   420     def has_been_modified(self, form):

   420     def has_been_modified(self, form):

   421         # fields not corresponding to an entity attribute / relations

   427         # fields not corresponding to an entity attribute / relations

   422         # are considered modified

   428         # are considered modified

   423         if not self.eidparam or not self.role or not form.edited_entity.has_eid():

   429         if not self.eidparam or not self.role or not form.edited_entity.has_eid():

   424             return True # XXX

   430             return True # XXX

   425         try:

   431         try:

   439         try:

   445         try:

   440             new_value = self.process_form_value(form)

   446             new_value = self.process_form_value(form)

   441         except ProcessFormError:

   447         except ProcessFormError:

   442             return True

   448             return True

   443         except UnmodifiedField:

   449         except UnmodifiedField:

   445         if previous_value == new_value:

   451         if previous_value == new_value:

   446             return False # not modified

   452             return False # not modified

   447         return True

   453         return True

   448 

   454 

   449     def process_form_value(self, form):

   455     def process_form_value(self, form):