PHP quiz_get_grading_options函数代码示例

 public function load_choices()
 {
     global $CFG;
     if (is_array($this->choices)) {
         return true;
     }
     require_once $CFG->dirroot . '/mod/quiz/locallib.php';
     $this->choices = quiz_get_grading_options();
     return true;
 }

 protected function definition()
 {
     $mform = $this->_form;
     $mform->addElement('header', 'preferencespage', get_string('reportsettings', 'quiz_statistics'));
     $options = array();
     foreach (array_keys(quiz_get_grading_options()) as $which) {
         $options[$which] = \quiz_statistics_calculator::using_attempts_lang_string($which);
     }
     $mform->addElement('select', 'whichattempts', get_string('calculatefrom', 'quiz_statistics'), $options);
     $mform->addElement('submit', 'submitbutton', get_string('preferencessave', 'quiz_overview'));
 }

 protected function definition()
 {
     $mform = $this->_form;
     $mform->addElement('header', 'preferencespage', get_string('reportsettings', 'quiz_statistics'));
     $options = array();
     foreach (array_keys(quiz_get_grading_options()) as $which) {
         $options[$which] = \quiz_statistics\calculator::using_attempts_lang_string($which);
     }
     $mform->addElement('select', 'whichattempts', get_string('calculatefrom', 'quiz_statistics'), $options);
     if (quiz_allows_multiple_tries($this->_customdata['quiz'])) {
         $mform->addElement('select', 'whichtries', get_string('whichtries', 'quiz_statistics'), array(question_attempt::FIRST_TRY => get_string('firsttry', 'question'), question_attempt::LAST_TRY => get_string('lasttry', 'question'), question_attempt::ALL_TRIES => get_string('alltries', 'question')));
         $mform->setDefault('whichtries', question_attempt::LAST_TRY);
     }
     $mform->addElement('submit', 'submitbutton', get_string('preferencessave', 'quiz_overview'));
 }

/**
 * @param int $option one of the values QUIZ_GRADEHIGHEST, QUIZ_GRADEAVERAGE, QUIZ_ATTEMPTFIRST or QUIZ_ATTEMPTLAST.
 * @return the lang string for that option.
 */
function quiz_get_grading_option_name($option)
{
    $strings = quiz_get_grading_options();
    return $strings[$option];
}

 protected function definition()
 {
     global $COURSE, $CFG, $DB, $PAGE;
     $quizconfig = get_config('quiz');
     $mform = $this->_form;
     // -------------------------------------------------------------------------------
     $mform->addElement('header', 'general', get_string('general', 'form'));
     // Name.
     $mform->addElement('text', 'name', get_string('name'), array('size' => '64'));
     if (!empty($CFG->formatstringstriptags)) {
         $mform->setType('name', PARAM_TEXT);
     } else {
         $mform->setType('name', PARAM_CLEANHTML);
     }
     $mform->addRule('name', null, 'required', null, 'client');
     $mform->addRule('name', get_string('maximumchars', '', 255), 'maxlength', 255, 'client');
     // Introduction.
     $this->add_intro_editor(false, get_string('introduction', 'quiz'));
     // -------------------------------------------------------------------------------
     $mform->addElement('header', 'timing', get_string('timing', 'quiz'));
     // Open and close dates.
     $mform->addElement('date_time_selector', 'timeopen', get_string('quizopen', 'quiz'), self::$datefieldoptions);
     $mform->addHelpButton('timeopen', 'quizopenclose', 'quiz');
     $mform->addElement('date_time_selector', 'timeclose', get_string('quizclose', 'quiz'), self::$datefieldoptions);
     // Time limit.
     $mform->addElement('duration', 'timelimit', get_string('timelimit', 'quiz'), array('optional' => true));
     $mform->addHelpButton('timelimit', 'timelimit', 'quiz');
     $mform->setAdvanced('timelimit', $quizconfig->timelimit_adv);
     $mform->setDefault('timelimit', $quizconfig->timelimit);
     // What to do with overdue attempts.
     $mform->addElement('select', 'overduehandling', get_string('overduehandling', 'quiz'), quiz_get_overdue_handling_options());
     $mform->addHelpButton('overduehandling', 'overduehandling', 'quiz');
     $mform->setAdvanced('overduehandling', $quizconfig->overduehandling_adv);
     $mform->setDefault('overduehandling', $quizconfig->overduehandling);
     // TODO Formslib does OR logic on disableif, and we need AND logic here.
     // $mform->disabledIf('overduehandling', 'timelimit', 'eq', 0);
     // $mform->disabledIf('overduehandling', 'timeclose', 'eq', 0);
     // Grace period time.
     $mform->addElement('duration', 'graceperiod', get_string('graceperiod', 'quiz'), array('optional' => true));
     $mform->addHelpButton('graceperiod', 'graceperiod', 'quiz');
     $mform->setAdvanced('graceperiod', $quizconfig->graceperiod_adv);
     $mform->setDefault('graceperiod', $quizconfig->graceperiod);
     $mform->disabledIf('graceperiod', 'overduehandling', 'neq', 'graceperiod');
     // -------------------------------------------------------------------------------
     // Grade settings.
     $this->standard_grading_coursemodule_elements();
     $mform->removeElement('grade');
     $mform->addElement('hidden', 'grade', $quizconfig->maximumgrade);
     $mform->setType('grade', PARAM_FLOAT);
     // Number of attempts.
     $attemptoptions = array('0' => get_string('unlimited'));
     for ($i = 1; $i <= QUIZ_MAX_ATTEMPT_OPTION; $i++) {
         $attemptoptions[$i] = $i;
     }
     $mform->addElement('select', 'attempts', get_string('attemptsallowed', 'quiz'), $attemptoptions);
     $mform->setAdvanced('attempts', $quizconfig->attempts_adv);
     $mform->setDefault('attempts', $quizconfig->attempts);
     // Grading method.
     $mform->addElement('select', 'grademethod', get_string('grademethod', 'quiz'), quiz_get_grading_options());
     $mform->addHelpButton('grademethod', 'grademethod', 'quiz');
     $mform->setAdvanced('grademethod', $quizconfig->grademethod_adv);
     $mform->setDefault('grademethod', $quizconfig->grademethod);
     if ($this->get_max_attempts_for_any_override() < 2) {
         $mform->disabledIf('grademethod', 'attempts', 'eq', 1);
     }
     // -------------------------------------------------------------------------------
     $mform->addElement('header', 'layouthdr', get_string('layout', 'quiz'));
     // Shuffle questions.
     $shuffleoptions = array(0 => get_string('asshownoneditscreen', 'quiz'), 1 => get_string('shuffledrandomly', 'quiz'));
     $mform->addElement('select', 'shufflequestions', get_string('questionorder', 'quiz'), $shuffleoptions, array('id' => 'id_shufflequestions'));
     $mform->setAdvanced('shufflequestions', $quizconfig->shufflequestions_adv);
     $mform->setDefault('shufflequestions', $quizconfig->shufflequestions);
     // Questions per page.
     $pageoptions = array();
     $pageoptions[0] = get_string('neverallononepage', 'quiz');
     $pageoptions[1] = get_string('everyquestion', 'quiz');
     for ($i = 2; $i <= QUIZ_MAX_QPP_OPTION; ++$i) {
         $pageoptions[$i] = get_string('everynquestions', 'quiz', $i);
     }
     $pagegroup = array();
     $pagegroup[] = $mform->createElement('select', 'questionsperpage', get_string('newpage', 'quiz'), $pageoptions, array('id' => 'id_questionsperpage'));
     $mform->setDefault('questionsperpage', $quizconfig->questionsperpage);
     if (!empty($this->_cm)) {
         $pagegroup[] = $mform->createElement('checkbox', 'repaginatenow', '', get_string('repaginatenow', 'quiz'), array('id' => 'id_repaginatenow'));
         $mform->disabledIf('repaginatenow', 'shufflequestions', 'eq', 1);
         $PAGE->requires->js('/question/qengine.js');
         $module = array('name' => 'mod_quiz_edit', 'fullpath' => '/mod/quiz/edit.js', 'requires' => array('yui2-dom', 'yui2-event', 'yui2-container'), 'strings' => array(), 'async' => false);
         $PAGE->requires->js_init_call('quiz_settings_init', null, false, $module);
     }
     $mform->addGroup($pagegroup, 'questionsperpagegrp', get_string('newpage', 'quiz'), null, false);
     $mform->addHelpButton('questionsperpagegrp', 'newpage', 'quiz');
     $mform->setAdvanced('questionsperpagegrp', $quizconfig->questionsperpage_adv);
     // Navigation method.
     $mform->addElement('select', 'navmethod', get_string('navmethod', 'quiz'), quiz_get_navigation_options());
     $mform->addHelpButton('navmethod', 'navmethod', 'quiz');
     $mform->setAdvanced('navmethod', $quizconfig->navmethod_adv);
     $mform->setDefault('navmethod', $quizconfig->navmethod);
     // -------------------------------------------------------------------------------
     $mform->addElement('header', 'interactionhdr', get_string('questionbehaviour', 'quiz'));
     // Shuffle within questions.
//.........这里部分代码省略.........

 /**
  * Calculating count and mean of marks for first and ALL attempts by students.
  *
  * See : http://docs.moodle.org/dev/Quiz_item_analysis_calculations_in_practise
  *                                      #Calculating_MEAN_of_grades_for_all_attempts_by_students
  * @param int $quizid
  * @param \core\dml\sql_join $groupstudentsjoins Contains joins, wheres, params for students in this group.
  * @return \stdClass with properties with count and avg with prefixes firstattempts, highestattempts, etc.
  */
 protected function attempt_counts_and_averages($quizid, \core\dml\sql_join $groupstudentsjoins)
 {
     global $DB;
     $attempttotals = new \stdClass();
     foreach (array_keys(quiz_get_grading_options()) as $which) {
         list($fromqa, $whereqa, $qaparams) = quiz_statistics_attempts_sql($quizid, $groupstudentsjoins, $which);
         $fromdb = $DB->get_record_sql("SELECT COUNT(*) AS rcount, AVG(sumgrades) AS average FROM {$fromqa} WHERE {$whereqa}", $qaparams);
         $fieldprefix = static::using_attempts_string_id($which);
         $attempttotals->{$fieldprefix . 'avg'} = $fromdb->average;
         $attempttotals->{$fieldprefix . 'count'} = $fromdb->rcount;
     }
     return $attempttotals;
 }

} else {
    $pagetitle = get_string('generalsettings', 'admin');
}
$quizsettings = new admin_settingpage('modsettingquiz', $pagetitle, 'moodle/site:config');
// Introductory explanation that all the settings are defaults for the add quiz form.
$quizsettings->add(new admin_setting_heading('quizintro', '', get_string('configintro', 'quiz')));
// Time limit
$quizsettings->add(new admin_setting_configtext_with_advanced('quiz/timelimit', get_string('timelimitsec', 'quiz'), get_string('configtimelimitsec', 'quiz'), array('value' => '0', 'fix' => false), PARAM_INT));
// Number of attempts
$options = array(get_string('unlimited'));
for ($i = 1; $i <= QUIZ_MAX_ATTEMPT_OPTION; $i++) {
    $options[$i] = $i;
}
$quizsettings->add(new admin_setting_configselect_with_advanced('quiz/attempts', get_string('attemptsallowed', 'quiz'), get_string('configattemptsallowed', 'quiz'), array('value' => 0, 'fix' => false), $options));
// Grading method.
$quizsettings->add(new admin_setting_configselect_with_advanced('quiz/grademethod', get_string('grademethod', 'quiz'), get_string('configgrademethod', 'quiz'), array('value' => QUIZ_GRADEHIGHEST, 'fix' => false), quiz_get_grading_options()));
// Maximum grade
$quizsettings->add(new admin_setting_configtext('quiz/maximumgrade', get_string('maximumgrade'), get_string('configmaximumgrade', 'quiz'), 10, PARAM_INT));
// Shuffle questions
$quizsettings->add(new admin_setting_configcheckbox_with_advanced('quiz/shufflequestions', get_string('shufflequestions', 'quiz'), get_string('configshufflequestions', 'quiz'), array('value' => 0, 'adv' => false)));
// Questions per page
$perpage = array();
$perpage[0] = get_string('never');
$perpage[1] = get_string('aftereachquestion', 'quiz');
for ($i = 2; $i <= QUIZ_MAX_QPP_OPTION; ++$i) {
    $perpage[$i] = get_string('afternquestions', 'quiz', $i);
}
$quizsettings->add(new admin_setting_configselect_with_advanced('quiz/questionsperpage', get_string('newpageevery', 'quiz'), get_string('confignewpageevery', 'quiz'), array('value' => 1, 'fix' => false), $perpage));
// Shuffle within questions
$quizsettings->add(new admin_setting_configcheckbox_with_advanced('quiz/shuffleanswers', get_string('shufflewithin', 'quiz'), get_string('configshufflewithin', 'quiz'), array('value' => 1, 'adv' => false)));
// Adaptive mode.

 function definition()
 {
     global $COURSE, $CFG;
     $mform =& $this->_form;
     //-------------------------------------------------------------------------------
     $mform->addElement('header', 'general', get_string('general', 'form'));
     $mform->addElement('text', 'name', get_string('name'), array('size' => '64'));
     if (!empty($CFG->formatstringstriptags)) {
         $mform->setType('name', PARAM_TEXT);
     } else {
         $mform->setType('name', PARAM_CLEAN);
     }
     $mform->addRule('name', null, 'required', null, 'client');
     $mform->addElement('htmleditor', 'intro', get_string("introduction", "quiz"));
     $mform->setType('intro', PARAM_RAW);
     $mform->setHelpButton('intro', array('richtext', get_string('helprichtext')));
     //-------------------------------------------------------------------------------
     $mform->addElement('header', 'timinghdr', get_string('timing', 'form'));
     $mform->addElement('date_time_selector', 'timeopen', get_string('quizopen', 'quiz'), array('optional' => true));
     $mform->setHelpButton('timeopen', array('timeopen', get_string('quizopen', 'quiz'), 'quiz'));
     $mform->addElement('date_time_selector', 'timeclose', get_string('quizclose', 'quiz'), array('optional' => true));
     $mform->setHelpButton('timeclose', array('timeopen', get_string('quizclose', 'quiz'), 'quiz'));
     $timelimitgrp = array();
     $timelimitgrp[] =& $mform->createElement('text', 'timelimit');
     $timelimitgrp[] =& $mform->createElement('checkbox', 'timelimitenable', '', get_string('enable'));
     $mform->addGroup($timelimitgrp, 'timelimitgrp', get_string('timelimitmin', 'quiz'), array(' '), false);
     $mform->setType('timelimit', PARAM_TEXT);
     $timelimitgrprules = array();
     $timelimitgrprules['timelimit'][] = array(null, 'numeric', null, 'client');
     $mform->addGroupRule('timelimitgrp', $timelimitgrprules);
     $mform->disabledIf('timelimitgrp', 'timelimitenable');
     $mform->setAdvanced('timelimitgrp', $CFG->quiz_fix_timelimit);
     $mform->setHelpButton('timelimitgrp', array("timelimit", get_string("quiztimer", "quiz"), "quiz"));
     $mform->setDefault('timelimit', $CFG->quiz_timelimit);
     $mform->setDefault('timelimitenable', !empty($CFG->quiz_timelimit));
     //enforced time delay between quiz attempts add-on
     $timedelayoptions = array();
     $timedelayoptions[0] = get_string('none');
     $timedelayoptions[1800] = get_string('numminutes', '', 30);
     $timedelayoptions[3600] = get_string('numminutes', '', 60);
     for ($i = 2; $i <= 23; $i++) {
         $seconds = $i * 3600;
         $timedelayoptions[$seconds] = get_string('numhours', '', $i);
     }
     $timedelayoptions[86400] = get_string('numhours', '', 24);
     for ($i = 2; $i <= 7; $i++) {
         $seconds = $i * 86400;
         $timedelayoptions[$seconds] = get_string('numdays', '', $i);
     }
     $mform->addElement('select', 'delay1', get_string("delay1", "quiz"), $timedelayoptions);
     $mform->setHelpButton('delay1', array("timedelay1", get_string("delay1", "quiz"), "quiz"));
     $mform->setAdvanced('delay1', $CFG->quiz_fix_delay1);
     $mform->setDefault('delay1', $CFG->quiz_delay1);
     $mform->addElement('select', 'delay2', get_string("delay2", "quiz"), $timedelayoptions);
     $mform->setHelpButton('delay2', array("timedelay2", get_string("delay2", "quiz"), "quiz"));
     $mform->setAdvanced('delay2', $CFG->quiz_fix_delay2);
     $mform->setDefault('delay2', $CFG->quiz_delay2);
     //-------------------------------------------------------------------------------
     $mform->addElement('header', 'displayhdr', get_string('display', 'form'));
     $perpage = array();
     for ($i = 0; $i <= 50; ++$i) {
         $perpage[$i] = $i;
     }
     $perpage[0] = get_string('allinone', 'quiz');
     $mform->addElement('select', 'questionsperpage', get_string('questionsperpage', 'quiz'), $perpage);
     $mform->setHelpButton('questionsperpage', array('questionsperpage', get_string('questionsperpage', 'quiz'), 'quiz'));
     $mform->setAdvanced('questionsperpage', $CFG->quiz_fix_questionsperpage);
     $mform->setDefault('questionsperpage', $CFG->quiz_questionsperpage);
     $mform->addElement('selectyesno', 'shufflequestions', get_string("shufflequestions", "quiz"));
     $mform->setHelpButton('shufflequestions', array("shufflequestions", get_string("shufflequestions", "quiz"), "quiz"));
     $mform->setAdvanced('shufflequestions', $CFG->quiz_fix_shufflequestions);
     $mform->setDefault('shufflequestions', $CFG->quiz_shufflequestions);
     $mform->addElement('selectyesno', 'shuffleanswers', get_string("shufflewithin", "quiz"));
     $mform->setHelpButton('shuffleanswers', array("shufflewithin", get_string("shufflewithin", "quiz"), "quiz"));
     $mform->setAdvanced('shuffleanswers', $CFG->quiz_fix_shuffleanswers);
     $mform->setDefault('shuffleanswers', $CFG->quiz_shuffleanswers);
     //-------------------------------------------------------------------------------
     $mform->addElement('header', 'attemptshdr', get_string('attempts', 'quiz'));
     $attemptoptions = array('0' => get_string('unlimited'));
     for ($i = 1; $i <= 10; $i++) {
         $attemptoptions[$i] = $i;
     }
     $mform->addElement('select', 'attempts', get_string("attemptsallowed", "quiz"), $attemptoptions);
     $mform->setHelpButton('attempts', array("attempts", get_string("attemptsallowed", "quiz"), "quiz"));
     $mform->setAdvanced('attempts', $CFG->quiz_fix_attempts);
     $mform->setDefault('attempts', $CFG->quiz_attempts);
     $mform->addElement('selectyesno', 'attemptonlast', get_string("eachattemptbuildsonthelast", "quiz"));
     $mform->setHelpButton('attemptonlast', array("repeatattempts", get_string("eachattemptbuildsonthelast", "quiz"), "quiz"));
     $mform->setAdvanced('attemptonlast', $CFG->quiz_fix_attemptonlast);
     $mform->setDefault('attemptonlast', $CFG->quiz_attemptonlast);
     $mform->addElement('selectyesno', 'adaptive', get_string("adaptive", "quiz"));
     $mform->setHelpButton('adaptive', array("adaptive", get_string("adaptive", "quiz"), "quiz"));
     $mform->setAdvanced('adaptive', $CFG->quiz_fix_adaptive);
     $mform->setDefault('adaptive', $CFG->quiz_optionflags & QUESTION_ADAPTIVE);
     //-------------------------------------------------------------------------------
     $mform->addElement('header', 'gradeshdr', get_string('grades', 'grades'));
     $mform->addElement('select', 'grademethod', get_string("grademethod", "quiz"), quiz_get_grading_options());
     $mform->setHelpButton('grademethod', array("grademethod", get_string("grademethod", "quiz"), "quiz"));
     $mform->setAdvanced('grademethod', $CFG->quiz_fix_grademethod);
     $mform->setDefault('grademethod', $CFG->quiz_grademethod);
//.........这里部分代码省略.........

    protected function definition() {
        global $COURSE, $CFG, $DB, $PAGE;
        $quizconfig = get_config('quiz');
        $mform = $this->_form;

        //-------------------------------------------------------------------------------
        $mform->addElement('header', 'general', get_string('general', 'form'));

        // Name.
        $mform->addElement('text', 'name', get_string('name'), array('size'=>'64'));
        if (!empty($CFG->formatstringstriptags)) {
            $mform->setType('name', PARAM_TEXT);
        } else {
            $mform->setType('name', PARAM_CLEANHTML);
        }
        $mform->addRule('name', null, 'required', null, 'client');

        // Introduction.
        $this->add_intro_editor(false, get_string('introduction', 'quiz'));

        // Open and close dates.
        $mform->addElement('date_time_selector', 'timeopen', get_string('quizopen', 'quiz'),
                array('optional' => true, 'step' => 1));
        $mform->addHelpButton('timeopen', 'quizopenclose', 'quiz');

        $mform->addElement('date_time_selector', 'timeclose', get_string('quizclose', 'quiz'),
                array('optional' => true, 'step' => 1));

        // Time limit.
        $mform->addElement('duration', 'timelimit', get_string('timelimit', 'quiz'),
                array('optional' => true));
        $mform->addHelpButton('timelimit', 'timelimit', 'quiz');
        $mform->setAdvanced('timelimit', $quizconfig->timelimit_adv);
        $mform->setDefault('timelimit', $quizconfig->timelimit);

        // Number of attempts.
        $attemptoptions = array('0' => get_string('unlimited'));
        for ($i = 1; $i <= QUIZ_MAX_ATTEMPT_OPTION; $i++) {
            $attemptoptions[$i] = $i;
        }
        $mform->addElement('select', 'attempts', get_string('attemptsallowed', 'quiz'),
                $attemptoptions);
        $mform->setAdvanced('attempts', $quizconfig->attempts_adv);
        $mform->setDefault('attempts', $quizconfig->attempts);

        // Grading method.
        $mform->addElement('select', 'grademethod', get_string('grademethod', 'quiz'),
                quiz_get_grading_options());
        $mform->addHelpButton('grademethod', 'grademethod', 'quiz');
        $mform->setAdvanced('grademethod', $quizconfig->grademethod_adv);
        $mform->setDefault('grademethod', $quizconfig->grademethod);
        $mform->disabledIf('grademethod', 'attempts', 'eq', 1);

        //-------------------------------------------------------------------------------
        // Grade settings
        $this->standard_grading_coursemodule_elements();

        $mform->removeElement('grade');
        $mform->addElement('hidden', 'grade', $quizconfig->maximumgrade);
        $mform->setType('grade', PARAM_NUMBER);

        //-------------------------------------------------------------------------------
        $mform->addElement('header', 'layouthdr', get_string('layout', 'quiz'));

        // Shuffle questions.
        $shuffleoptions = array(
            0 => get_string('asshownoneditscreen', 'quiz'),
            1 => get_string('shuffledrandomly', 'quiz')
        );
        $mform->addElement('select', 'shufflequestions', get_string('questionorder', 'quiz'),
                $shuffleoptions, array('id' => 'id_shufflequestions'));
        $mform->setAdvanced('shufflequestions', $quizconfig->shufflequestions_adv);
        $mform->setDefault('shufflequestions', $quizconfig->shufflequestions);

        // Questions per page.
        $pageoptions = array();
        $pageoptions[0] = get_string('neverallononepage', 'quiz');
        $pageoptions[1] = get_string('everyquestion', 'quiz');
        for ($i = 2; $i <= QUIZ_MAX_QPP_OPTION; ++$i) {
            $pageoptions[$i] = get_string('everynquestions', 'quiz', $i);
        }

        $pagegroup = array();
        $pagegroup[] = $mform->createElement('select', 'questionsperpage',
                get_string('newpage', 'quiz'), $pageoptions, array('id' => 'id_questionsperpage'));
        $mform->setDefault('questionsperpage', $quizconfig->questionsperpage);

        if (!empty($this->_cm)) {
            $pagegroup[] = $mform->createElement('checkbox', 'repaginatenow', '',
                    get_string('repaginatenow', 'quiz'), array('id' => 'id_repaginatenow'));
            $mform->disabledIf('repaginatenow', 'shufflequestions', 'eq', 1);
            $PAGE->requires->yui2_lib('event');
            $PAGE->requires->js('/mod/quiz/edit.js');
            $PAGE->requires->js_init_call('quiz_settings_init');
        }

        $mform->addGroup($pagegroup, 'questionsperpagegrp',
                get_string('newpage', 'quiz'), null, false);
        $mform->addHelpButton('questionsperpagegrp', 'newpage', 'quiz');
        $mform->setAdvanced('questionsperpagegrp', $quizconfig->questionsperpage_adv);
//.........这里部分代码省略.........

    function definition() {

        global $COURSE, $CFG, $DB, $PAGE;
        $quizconfig = get_config('quiz');
        $mform    =& $this->_form;

//-------------------------------------------------------------------------------
        $mform->addElement('header', 'general', get_string('general', 'form'));

    /// Name.
        $mform->addElement('text', 'name', get_string('name'), array('size'=>'64'));
        if (!empty($CFG->formatstringstriptags)) {
            $mform->setType('name', PARAM_TEXT);
        } else {
            $mform->setType('name', PARAM_CLEANHTML);
        }
        $mform->addRule('name', null, 'required', null, 'client');

    /// Introduction.
        $this->add_intro_editor(false, get_string('introduction', 'quiz'));

    /// Open and close dates.
        $mform->addElement('date_time_selector', 'timeopen', get_string('quizopen', 'quiz'), array('optional' => true));
        $mform->addElement('date_time_selector', 'timeclose', get_string('quizclose', 'quiz'), array('optional' => true));

    /// Time limit.
        $mform->addElement('duration', 'timelimit', get_string('timelimit', 'quiz'), array('optional' => true));
        $mform->addHelpButton('timelimit', 'timelimit', 'quiz');
        $mform->setAdvanced('timelimit', $quizconfig->timelimit_adv);
        $mform->setDefault('timelimit', $quizconfig->timelimit);

    /// Number of attempts.
        $attemptoptions = array('0' => get_string('unlimited'));
        for ($i = 1; $i <= QUIZ_MAX_ATTEMPT_OPTION; $i++) {
            $attemptoptions[$i] = $i;
        }
        $mform->addElement('select', 'attempts', get_string('attemptsallowed', 'quiz'), $attemptoptions);
        $mform->setAdvanced('attempts', $quizconfig->attempts_adv);
        $mform->setDefault('attempts', $quizconfig->attempts);

    /// Grading method.
        $mform->addElement('select', 'grademethod', get_string('grademethod', 'quiz'), quiz_get_grading_options());
        $mform->addHelpButton('grademethod', 'grademethod', 'quiz');
        $mform->setAdvanced('grademethod', $quizconfig->grademethod_adv);
        $mform->setDefault('grademethod', $quizconfig->grademethod);
        $mform->disabledIf('grademethod', 'attempts', 'eq', 1);

//-------------------------------------------------------------------------------
        $mform->addElement('header', 'layouthdr', get_string('layout', 'quiz'));

    /// Shuffle questions.
        $shuffleoptions = array(0 => get_string('asshownoneditscreen', 'quiz'), 1 => get_string('shuffledrandomly', 'quiz'));
        $mform->addElement('select', 'shufflequestions', get_string('questionorder', 'quiz'), $shuffleoptions, array('id' => 'id_shufflequestions'));
        $mform->setAdvanced('shufflequestions', $quizconfig->shufflequestions_adv);
        $mform->setDefault('shufflequestions', $quizconfig->shufflequestions);

    /// Questions per page.
        $pageoptions = array();
        $pageoptions[0] = get_string('neverallononepage', 'quiz');
        $pageoptions[1] = get_string('everyquestion', 'quiz');
        for ($i = 2; $i <= QUIZ_MAX_QPP_OPTION; ++$i) {
            $pageoptions[$i] = get_string('everynquestions', 'quiz', $i);
        }

        $pagegroup = array();
        $pagegroup[] = &$mform->createElement('select', 'questionsperpage', get_string('newpage', 'quiz'), $pageoptions, array('id' => 'id_questionsperpage'));
        $mform->setDefault('questionsperpage', $quizconfig->questionsperpage);

        if (!empty($this->_cm)) {
            $pagegroup[] = &$mform->createElement('checkbox', 'repaginatenow', '', get_string('repaginatenow', 'quiz'), array('id' => 'id_repaginatenow'));
            $mform->disabledIf('repaginatenow', 'shufflequestions', 'eq', 1);
            $PAGE->requires->yui2_lib('event');
            $PAGE->requires->js('/mod/quiz/edit.js');
        }

        $mform->addGroup($pagegroup, 'questionsperpagegrp', get_string('newpage', 'quiz'), null, false);
        $mform->addHelpButton('questionsperpagegrp', 'newpage', 'quiz');
        $mform->setAdvanced('questionsperpagegrp', $quizconfig->questionsperpage_adv);

//-------------------------------------------------------------------------------
        $mform->addElement('header', 'interactionhdr', get_string('questionbehaviour', 'quiz'));

    /// Shuffle within questions.
        $mform->addElement('selectyesno', 'shuffleanswers', get_string('shufflewithin', 'quiz'));
        $mform->addHelpButton('shuffleanswers', 'shufflewithin', 'quiz');
        $mform->setAdvanced('shuffleanswers', $quizconfig->shuffleanswers_adv);
        $mform->setDefault('shuffleanswers', $quizconfig->shuffleanswers);

    /// Adaptive mode.
        $mform->addElement('selectyesno', 'adaptive', get_string('adaptive', 'quiz'));
        $mform->addHelpButton('adaptive', 'adaptive', 'quiz');
        $mform->setAdvanced('adaptive', $quizconfig->optionflags_adv);
        $mform->setDefault('adaptive', $quizconfig->optionflags & QUESTION_ADAPTIVE);

    /// Apply penalties.
        $mform->addElement('selectyesno', 'penaltyscheme', get_string('penaltyscheme', 'quiz'));
        $mform->addHelpButton('penaltyscheme', 'penaltyscheme', 'quiz');
        $mform->setAdvanced('penaltyscheme', $quizconfig->penaltyscheme_adv);
        $mform->setDefault('penaltyscheme', $quizconfig->penaltyscheme);
        $mform->disabledIf('penaltyscheme', 'adaptive', 'neq', 1);
//.........这里部分代码省略.........

 /**
  * Calculating count and mean of marks for first and ALL attempts by students.
  *
  * See : http://docs.moodle.org/dev/Quiz_item_analysis_calculations_in_practise
  *                                      #Calculating_MEAN_of_grades_for_all_attempts_by_students
  * @param int $quizid
  * @param array $groupstudents
  * @return stdClass with properties with count and avg with prefixes firstattempts, highestattempts, etc.
  */
 protected function attempt_counts_and_averages($quizid, $groupstudents)
 {
     global $DB;
     list($fromqa, $whereqa, $qaparams) = quiz_statistics_attempts_sql($quizid, $groupstudents);
     $selects = array();
     foreach (array_keys(quiz_get_grading_options()) as $which) {
         $fieldprefix = static::using_attempts_string_id($which);
         $condition = quiz_report_grade_method_sql($which);
         if ($condition == '') {
             $case = '1';
         } else {
             $case = "CASE WHEN ({$condition}) THEN 1 ELSE 0 END";
         }
         $selects[] = "\n                    SUM({$case}) AS {$fieldprefix}count,\n                    SUM(sumgrades * {$case}) AS {$fieldprefix}total";
     }
     $select = join(',', $selects);
     $attempttotals = $DB->get_record_sql("\n                SELECT {$select}\n                FROM {$fromqa}\n                WHERE {$whereqa}", $qaparams);
     foreach (array_keys(quiz_get_grading_options()) as $which) {
         $fieldprefix = static::using_attempts_string_id($which);
         $attempttotals->{$fieldprefix . 'avg'} = $attempttotals->{$fieldprefix . 'total'} / $attempttotals->{$fieldprefix . 'count'};
         unset($attempttotals->{$fieldprefix . 'total'});
     }
     return $attempttotals;
 }