I can find the variable $form in the .../assignment/details.php and moodle/course/mod.php,and Does the $form appear in the mod.php first time?
And will the values of $form transfer to the assignment class instance(for example assignment_uploadsingle).If yes,how it transfer the value to the assignment.class.php?
I think the values won't transfer to the assignment class.Am I right?
I have found the answer .Through the setup function,and the values are given in the mod.php from $mod. Am I all right?