PHP question_usage_by_activity::set_preferred_behaviour方法代码示例

 /**
  * Construct the class.  if a dbattempt object is passed in set it, otherwise initialize empty class
  *
  * @param questionmanager $questionmanager
  * @param \stdClass
  * @param \context_module $context
  */
 public function __construct($questionmanager, $dbattempt = null, $context = null)
 {
     $this->questionmanager = $questionmanager;
     $this->context = $context;
     // if empty create new attempt
     if (empty($dbattempt)) {
         $this->attempt = new \stdClass();
         // create a new quba since we're creating a new attempt
         $this->quba = \question_engine::make_questions_usage_by_activity('mod_activequiz', $this->questionmanager->getRTQ()->getContext());
         $this->quba->set_preferred_behaviour('immediatefeedback');
         $attemptlayout = $this->questionmanager->add_questions_to_quba($this->quba);
         // add the attempt layout to this instance
         $this->attempt->qubalayout = implode(',', $attemptlayout);
     } else {
         // else load it up in this class instance
         $this->attempt = $dbattempt;
         $this->quba = \question_engine::load_questions_usage_by_activity($this->attempt->questionengid);
     }
 }

 protected function start_attempt_at_question($question, $preferredbehaviour, $maxmark = null, $variant = 1)
 {
     $this->quba->set_preferred_behaviour($preferredbehaviour);
     $this->slot = $this->quba->add_question($question, $maxmark);
     $this->quba->start_question($this->slot, $variant);
 }

    /**
     * Create a question_usage_by_activity from records loaded from the database.
     *
     * For internal use only.
     *
     * @param Iterator $records Raw records loaded from the database.
     * @param int $questionattemptid The id of the question_attempt to extract.
     * @return question_usage_by_activity The newly constructed usage.
     */
    public static function load_from_records($records, $qubaid) {
        $record = $records->current();
        while ($record->qubaid != $qubaid) {
            $records->next();
            if (!$records->valid()) {
                throw new coding_exception("Question usage $qubaid not found in the database.");
            }
            $record = $records->current();
        }

        $quba = new question_usage_by_activity($record->component,
            context::instance_by_id($record->contextid, IGNORE_MISSING));
        $quba->set_id_from_database($record->qubaid);
        $quba->set_preferred_behaviour($record->preferredbehaviour);

        $quba->observer = new question_engine_unit_of_work($quba);

        // If slot is null then the current pointer in $records will not be
        // advanced in the while loop below, and we get stuck in an infinite loop,
        // since this method is supposed to always consume at least one record.
        // Therefore, in this case, advance the record here.
        if (is_null($record->slot)) {
            $records->next();
        }

        while ($record && $record->qubaid == $qubaid && !is_null($record->slot)) {
            $quba->questionattempts[$record->slot] =
                    question_attempt::load_from_records($records,
                    $record->questionattemptid, $quba->observer,
                    $quba->get_preferred_behaviour());
            if ($records->valid()) {
                $record = $records->current();
            } else {
                $record = false;
            }
        }

        return $quba;
    }

    /**
     * Create a question_usage_by_activity from records loaded from the database.
     *
     * For internal use only.
     *
     * @param Iterator $records Raw records loaded from the database.
     * @param int $questionattemptid The id of the question_attempt to extract.
     * @return question_usage_by_activity The newly constructed usage.
     */
    public static function load_from_records($records, $qubaid) {
        $record = $records->current();
        while ($record->qubaid != $qubaid) {
            $records->next();
            if (!$records->valid()) {
                throw new coding_exception("Question usage $qubaid not found in the database.");
            }
            $record = $records->current();
        }

        $quba = new question_usage_by_activity($record->component,
            get_context_instance_by_id($record->contextid));
        $quba->set_id_from_database($record->qubaid);
        $quba->set_preferred_behaviour($record->preferredbehaviour);

        $quba->observer = new question_engine_unit_of_work($quba);

        while ($record && $record->qubaid == $qubaid && !is_null($record->slot)) {
            $quba->questionattempts[$record->slot] =
                    question_attempt::load_from_records($records,
                    $record->questionattemptid, $quba->observer,
                    $quba->get_preferred_behaviour());
            if ($records->valid()) {
                $record = $records->current();
            } else {
                $record = false;
            }
        }

        return $quba;
    }