. /** * Question behaviour where the student can submit questions one at a * time for immediate feedback. * * @package qbehaviour * @subpackage interactive * @copyright 2009 The Open University * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ defined('MOODLE_INTERNAL') || die(); /** * Question behaviour for the interactive model. * * Each question has a submit button next to it which the student can use to * submit it. Once the qustion is submitted, it is not possible for the * student to change their answer any more, but the student gets full feedback * straight away. * * @copyright 2009 The Open University * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class qbehaviour_interactive extends question_behaviour_with_multiple_tries { /** * Special value used for {@link question_display_options::$readonly when * we are showing the try again button to the student during an attempt. * The particular number was chosen randomly. PHP will treat it the same * as true, but in the renderer we reconginse it display the try again * button enabled even though the rest of the question is disabled. * @var integer */ const READONLY_EXCEPT_TRY_AGAIN = 23485299; public function is_compatible_question(question_definition $question) { return $question instanceof question_automatically_gradable; } public function can_finish_during_attempt() { return true; } public function get_right_answer_summary() { return $this->question->get_right_answer_summary(); } /** * @return bool are we are currently in the try_again state. */ public function is_try_again_state() { $laststep = $this->qa->get_last_step(); return $this->qa->get_state()->is_active() && $laststep->has_behaviour_var('submit') && $laststep->has_behaviour_var('_triesleft'); } public function adjust_display_options(question_display_options $options) { // We only need different behaviour in try again states. if (!$this->is_try_again_state()) { parent::adjust_display_options($options); if ($this->qa->get_state() == question_state::$invalid && $options->marks == question_display_options::MARK_AND_MAX) { $options->marks = question_display_options::MAX_ONLY; } return; } // Let the hint adjust the options. $hint = $this->get_applicable_hint(); if (!is_null($hint)) { $hint->adjust_display_options($options); } // Now call the base class method, but protect some fields from being overwritten. $save = clone($options); parent::adjust_display_options($options); $options->feedback = $save->feedback; $options->numpartscorrect = $save->numpartscorrect; // In a try-again state, everything except the try again button // Should be read-only. This is a mild hack to achieve this. if (!$options->readonly) { $options->readonly = self::READONLY_EXCEPT_TRY_AGAIN; } } public function get_applicable_hint() { if (!$this->is_try_again_state()) { return null; } return $this->question->get_hint(count($this->question->hints) - $this->qa->get_last_behaviour_var('_triesleft'), $this->qa); } public function get_expected_data() { if ($this->is_try_again_state()) { return array( 'tryagain' => PARAM_BOOL, ); } else if ($this->qa->get_state()->is_active()) { return array( 'submit' => PARAM_BOOL, ); } return parent::get_expected_data(); } public function get_expected_qt_data() { $hint = $this->get_applicable_hint(); if (!empty($hint->clearwrong)) { return $this->question->get_expected_data(); } return parent::get_expected_qt_data(); } public function get_state_string($showcorrectness) { $state = $this->qa->get_state(); if (!$state->is_active() || $state == question_state::$invalid) { return parent::get_state_string($showcorrectness); } return get_string('triesremaining', 'qbehaviour_interactive', $this->qa->get_last_behaviour_var('_triesleft')); } public function init_first_step(question_attempt_step $step, $variant) { parent::init_first_step($step, $variant); $step->set_behaviour_var('_triesleft', count($this->question->hints) + 1); } public function process_action(question_attempt_pending_step $pendingstep) { if ($pendingstep->has_behaviour_var('finish')) { return $this->process_finish($pendingstep); } if ($this->is_try_again_state()) { if ($pendingstep->has_behaviour_var('tryagain')) { return $this->process_try_again($pendingstep); } else { return question_attempt::DISCARD; } } else { if ($pendingstep->has_behaviour_var('comment')) { return $this->process_comment($pendingstep); } else if ($pendingstep->has_behaviour_var('submit')) { return $this->process_submit($pendingstep); } else { return $this->process_save($pendingstep); } } } public function summarise_action(question_attempt_step $step) { if ($step->has_behaviour_var('comment')) { return $this->summarise_manual_comment($step); } else if ($step->has_behaviour_var('finish')) { return $this->summarise_finish($step); } else if ($step->has_behaviour_var('tryagain')) { return get_string('tryagain', 'qbehaviour_interactive'); } else if ($step->has_behaviour_var('submit')) { return $this->summarise_submit($step); } else { return $this->summarise_save($step); } } public function process_try_again(question_attempt_pending_step $pendingstep) { $pendingstep->set_state(question_state::$todo); return question_attempt::KEEP; } public function process_submit(question_attempt_pending_step $pendingstep) { if ($this->qa->get_state()->is_finished()) { return question_attempt::DISCARD; } if (!$this->is_complete_response($pendingstep)) { $pendingstep->set_state(question_state::$invalid); } else { $triesleft = $this->qa->get_last_behaviour_var('_triesleft'); $response = $pendingstep->get_qt_data(); list($fraction, $state) = $this->question->grade_response($response); if ($state == question_state::$gradedright || $triesleft == 1) { $pendingstep->set_state($state); $pendingstep->set_fraction($this->adjust_fraction($fraction, $pendingstep)); } else { $pendingstep->set_behaviour_var('_triesleft', $triesleft - 1); $pendingstep->set_state(question_state::$todo); } $pendingstep->set_new_response_summary($this->question->summarise_response($response)); } return question_attempt::KEEP; } protected function adjust_fraction($fraction, question_attempt_pending_step $pendingstep) { $totaltries = $this->qa->get_step(0)->get_behaviour_var('_triesleft'); $triesleft = $this->qa->get_last_behaviour_var('_triesleft'); $fraction -= ($totaltries - $triesleft) * $this->question->penalty; $fraction = max($fraction, 0); return $fraction; } public function process_finish(question_attempt_pending_step $pendingstep) { if ($this->qa->get_state()->is_finished()) { return question_attempt::DISCARD; } $response = $this->qa->get_last_qt_data(); if (!$this->question->is_gradable_response($response)) { $pendingstep->set_state(question_state::$gaveup); } else { list($fraction, $state) = $this->question->grade_response($response); $pendingstep->set_fraction($this->adjust_fraction($fraction, $pendingstep)); $pendingstep->set_state($state); } $pendingstep->set_new_response_summary($this->question->summarise_response($response)); return question_attempt::KEEP; } public function process_save(question_attempt_pending_step $pendingstep) { $status = parent::process_save($pendingstep); if ($status == question_attempt::KEEP && $pendingstep->get_state() == question_state::$complete) { $pendingstep->set_state(question_state::$todo); } return $status; } }