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Developer Documentation

See Release Notes

  • Bug fixes for general core bugs in 4.0.x will end 8 May 2023 (12 months).
  • Bug fixes for security issues in 4.0.x will end 13 November 2023 (18 months).
  • PHP version: minimum PHP 7.3.0 Note: the minimum PHP version has increased since Moodle 3.10. PHP 7.4.x is also supported.

Differences Between: [Versions 310 and 400] [Versions 311 and 400] [Versions 39 and 400] [Versions 400 and 402] [Versions 400 and 403]

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * Defines the quiz module ettings form.
  19   *
  20   * @package    mod_quiz
  21   * @copyright  2006 Jamie Pratt
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  
  26  defined('MOODLE_INTERNAL') || die();
  27  
  28  require_once($CFG->dirroot . '/course/moodleform_mod.php');
  29  require_once($CFG->dirroot . '/mod/quiz/locallib.php');
  30  
  31  
  32  /**
  33   * Settings form for the quiz module.
  34   *
  35   * @copyright  2006 Jamie Pratt
  36   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  37   */
  38  class mod_quiz_mod_form extends moodleform_mod {
  39      /** @var array options to be used with date_time_selector fields in the quiz. */
  40      public static $datefieldoptions = array('optional' => true);
  41  
  42      protected $_feedbacks;
  43      protected static $reviewfields = array(); // Initialised in the constructor.
  44  
  45      /** @var int the max number of attempts allowed in any user or group override on this quiz. */
  46      protected $maxattemptsanyoverride = null;
  47  
  48      public function __construct($current, $section, $cm, $course) {
  49          self::$reviewfields = array(
  50              'attempt'          => array('theattempt', 'quiz'),
  51              'correctness'      => array('whethercorrect', 'question'),
  52              'marks'            => array('marks', 'quiz'),
  53              'specificfeedback' => array('specificfeedback', 'question'),
  54              'generalfeedback'  => array('generalfeedback', 'question'),
  55              'rightanswer'      => array('rightanswer', 'question'),
  56              'overallfeedback'  => array('reviewoverallfeedback', 'quiz'),
  57          );
  58          parent::__construct($current, $section, $cm, $course);
  59      }
  60  
  61      protected function definition() {
  62          global $COURSE, $CFG, $DB, $PAGE;
  63          $quizconfig = get_config('quiz');
  64          $mform = $this->_form;
  65  
  66          // -------------------------------------------------------------------------------
  67          $mform->addElement('header', 'general', get_string('general', 'form'));
  68  
  69          // Name.
  70          $mform->addElement('text', 'name', get_string('name'), array('size'=>'64'));
  71          if (!empty($CFG->formatstringstriptags)) {
  72              $mform->setType('name', PARAM_TEXT);
  73          } else {
  74              $mform->setType('name', PARAM_CLEANHTML);
  75          }
  76          $mform->addRule('name', null, 'required', null, 'client');
  77          $mform->addRule('name', get_string('maximumchars', '', 255), 'maxlength', 255, 'client');
  78  
  79          // Introduction.
  80          $this->standard_intro_elements(get_string('introduction', 'quiz'));
  81  
  82          // -------------------------------------------------------------------------------
  83          $mform->addElement('header', 'timing', get_string('timing', 'quiz'));
  84  
  85          // Open and close dates.
  86          $mform->addElement('date_time_selector', 'timeopen', get_string('quizopen', 'quiz'),
  87                  self::$datefieldoptions);
  88          $mform->addHelpButton('timeopen', 'quizopenclose', 'quiz');
  89  
  90          $mform->addElement('date_time_selector', 'timeclose', get_string('quizclose', 'quiz'),
  91                  self::$datefieldoptions);
  92  
  93          // Time limit.
  94          $mform->addElement('duration', 'timelimit', get_string('timelimit', 'quiz'),
  95                  array('optional' => true));
  96          $mform->addHelpButton('timelimit', 'timelimit', 'quiz');
  97  
  98          // What to do with overdue attempts.
  99          $mform->addElement('select', 'overduehandling', get_string('overduehandling', 'quiz'),
 100                  quiz_get_overdue_handling_options());
 101          $mform->addHelpButton('overduehandling', 'overduehandling', 'quiz');
 102          // TODO Formslib does OR logic on disableif, and we need AND logic here.
 103          // $mform->disabledIf('overduehandling', 'timelimit', 'eq', 0);
 104          // $mform->disabledIf('overduehandling', 'timeclose', 'eq', 0);
 105  
 106          // Grace period time.
 107          $mform->addElement('duration', 'graceperiod', get_string('graceperiod', 'quiz'),
 108                  array('optional' => true));
 109          $mform->addHelpButton('graceperiod', 'graceperiod', 'quiz');
 110          $mform->hideIf('graceperiod', 'overduehandling', 'neq', 'graceperiod');
 111  
 112          // -------------------------------------------------------------------------------
 113          // Grade settings.
 114          $this->standard_grading_coursemodule_elements();
 115  
 116          $mform->removeElement('grade');
 117          if (property_exists($this->current, 'grade')) {
 118              $currentgrade = $this->current->grade;
 119          } else {
 120              $currentgrade = $quizconfig->maximumgrade;
 121          }
 122          $mform->addElement('hidden', 'grade', $currentgrade);
 123          $mform->setType('grade', PARAM_FLOAT);
 124  
 125          // Number of attempts.
 126          $attemptoptions = array('0' => get_string('unlimited'));
 127          for ($i = 1; $i <= QUIZ_MAX_ATTEMPT_OPTION; $i++) {
 128              $attemptoptions[$i] = $i;
 129          }
 130          $mform->addElement('select', 'attempts', get_string('attemptsallowed', 'quiz'),
 131                  $attemptoptions);
 132  
 133          // Grading method.
 134          $mform->addElement('select', 'grademethod', get_string('grademethod', 'quiz'),
 135                  quiz_get_grading_options());
 136          $mform->addHelpButton('grademethod', 'grademethod', 'quiz');
 137          if ($this->get_max_attempts_for_any_override() < 2) {
 138              $mform->hideIf('grademethod', 'attempts', 'eq', 1);
 139          }
 140  
 141          // -------------------------------------------------------------------------------
 142          $mform->addElement('header', 'layouthdr', get_string('layout', 'quiz'));
 143  
 144          $pagegroup = array();
 145          $pagegroup[] = $mform->createElement('select', 'questionsperpage',
 146                  get_string('newpage', 'quiz'), quiz_questions_per_page_options(), array('id' => 'id_questionsperpage'));
 147          $mform->setDefault('questionsperpage', $quizconfig->questionsperpage);
 148  
 149          if (!empty($this->_cm) && !quiz_has_attempts($this->_cm->instance)) {
 150              $pagegroup[] = $mform->createElement('checkbox', 'repaginatenow', '',
 151                      get_string('repaginatenow', 'quiz'), array('id' => 'id_repaginatenow'));
 152          }
 153  
 154          $mform->addGroup($pagegroup, 'questionsperpagegrp',
 155                  get_string('newpage', 'quiz'), null, false);
 156          $mform->addHelpButton('questionsperpagegrp', 'newpage', 'quiz');
 157          $mform->setAdvanced('questionsperpagegrp', $quizconfig->questionsperpage_adv);
 158  
 159          // Navigation method.
 160          $mform->addElement('select', 'navmethod', get_string('navmethod', 'quiz'),
 161                  quiz_get_navigation_options());
 162          $mform->addHelpButton('navmethod', 'navmethod', 'quiz');
 163  
 164          // -------------------------------------------------------------------------------
 165          $mform->addElement('header', 'interactionhdr', get_string('questionbehaviour', 'quiz'));
 166  
 167          // Shuffle within questions.
 168          $mform->addElement('selectyesno', 'shuffleanswers', get_string('shufflewithin', 'quiz'));
 169          $mform->addHelpButton('shuffleanswers', 'shufflewithin', 'quiz');
 170  
 171          // How questions behave (question behaviour).
 172          if (!empty($this->current->preferredbehaviour)) {
 173              $currentbehaviour = $this->current->preferredbehaviour;
 174          } else {
 175              $currentbehaviour = '';
 176          }
 177          $behaviours = question_engine::get_behaviour_options($currentbehaviour);
 178          $mform->addElement('select', 'preferredbehaviour',
 179                  get_string('howquestionsbehave', 'question'), $behaviours);
 180          $mform->addHelpButton('preferredbehaviour', 'howquestionsbehave', 'question');
 181  
 182          // Can redo completed questions.
 183          $redochoices = array(0 => get_string('no'), 1 => get_string('canredoquestionsyes', 'quiz'));
 184          $mform->addElement('select', 'canredoquestions', get_string('canredoquestions', 'quiz'), $redochoices);
 185          $mform->addHelpButton('canredoquestions', 'canredoquestions', 'quiz');
 186          foreach ($behaviours as $behaviour => $notused) {
 187              if (!question_engine::can_questions_finish_during_the_attempt($behaviour)) {
 188                  $mform->hideIf('canredoquestions', 'preferredbehaviour', 'eq', $behaviour);
 189              }
 190          }
 191  
 192          // Each attempt builds on last.
 193          $mform->addElement('selectyesno', 'attemptonlast',
 194                  get_string('eachattemptbuildsonthelast', 'quiz'));
 195          $mform->addHelpButton('attemptonlast', 'eachattemptbuildsonthelast', 'quiz');
 196          if ($this->get_max_attempts_for_any_override() < 2) {
 197              $mform->hideIf('attemptonlast', 'attempts', 'eq', 1);
 198          }
 199  
 200          // -------------------------------------------------------------------------------
 201          $mform->addElement('header', 'reviewoptionshdr',
 202                  get_string('reviewoptionsheading', 'quiz'));
 203          $mform->addHelpButton('reviewoptionshdr', 'reviewoptionsheading', 'quiz');
 204  
 205          // Review options.
 206          $this->add_review_options_group($mform, $quizconfig, 'during',
 207                  mod_quiz_display_options::DURING, true);
 208          $this->add_review_options_group($mform, $quizconfig, 'immediately',
 209                  mod_quiz_display_options::IMMEDIATELY_AFTER);
 210          $this->add_review_options_group($mform, $quizconfig, 'open',
 211                  mod_quiz_display_options::LATER_WHILE_OPEN);
 212          $this->add_review_options_group($mform, $quizconfig, 'closed',
 213                  mod_quiz_display_options::AFTER_CLOSE);
 214  
 215          foreach ($behaviours as $behaviour => $notused) {
 216              $unusedoptions = question_engine::get_behaviour_unused_display_options($behaviour);
 217              foreach ($unusedoptions as $unusedoption) {
 218                  $mform->disabledIf($unusedoption . 'during', 'preferredbehaviour',
 219                          'eq', $behaviour);
 220              }
 221          }
 222          $mform->disabledIf('attemptduring', 'preferredbehaviour',
 223                  'neq', 'wontmatch');
 224          $mform->disabledIf('overallfeedbackduring', 'preferredbehaviour',
 225                  'neq', 'wontmatch');
 226          foreach (self::$reviewfields as $field => $notused) {
 227              $mform->disabledIf($field . 'closed', 'timeclose[enabled]');
 228          }
 229  
 230          // -------------------------------------------------------------------------------
 231          $mform->addElement('header', 'display', get_string('appearance'));
 232  
 233          // Show user picture.
 234          $mform->addElement('select', 'showuserpicture', get_string('showuserpicture', 'quiz'),
 235                  quiz_get_user_image_options());
 236          $mform->addHelpButton('showuserpicture', 'showuserpicture', 'quiz');
 237  
 238          // Overall decimal points.
 239          $options = array();
 240          for ($i = 0; $i <= QUIZ_MAX_DECIMAL_OPTION; $i++) {
 241              $options[$i] = $i;
 242          }
 243          $mform->addElement('select', 'decimalpoints', get_string('decimalplaces', 'quiz'),
 244                  $options);
 245          $mform->addHelpButton('decimalpoints', 'decimalplaces', 'quiz');
 246  
 247          // Question decimal points.
 248          $options = array(-1 => get_string('sameasoverall', 'quiz'));
 249          for ($i = 0; $i <= QUIZ_MAX_Q_DECIMAL_OPTION; $i++) {
 250              $options[$i] = $i;
 251          }
 252          $mform->addElement('select', 'questiondecimalpoints',
 253                  get_string('decimalplacesquestion', 'quiz'), $options);
 254          $mform->addHelpButton('questiondecimalpoints', 'decimalplacesquestion', 'quiz');
 255  
 256          // Show blocks during quiz attempt.
 257          $mform->addElement('selectyesno', 'showblocks', get_string('showblocks', 'quiz'));
 258          $mform->addHelpButton('showblocks', 'showblocks', 'quiz');
 259  
 260          // -------------------------------------------------------------------------------
 261          $mform->addElement('header', 'security', get_string('extraattemptrestrictions', 'quiz'));
 262  
 263          // Require password to begin quiz attempt.
 264          $mform->addElement('passwordunmask', 'quizpassword', get_string('requirepassword', 'quiz'));
 265          $mform->setType('quizpassword', PARAM_TEXT);
 266          $mform->addHelpButton('quizpassword', 'requirepassword', 'quiz');
 267  
 268          // IP address.
 269          $mform->addElement('text', 'subnet', get_string('requiresubnet', 'quiz'));
 270          $mform->setType('subnet', PARAM_TEXT);
 271          $mform->addHelpButton('subnet', 'requiresubnet', 'quiz');
 272  
 273          // Enforced time delay between quiz attempts.
 274          $mform->addElement('duration', 'delay1', get_string('delay1st2nd', 'quiz'),
 275                  array('optional' => true));
 276          $mform->addHelpButton('delay1', 'delay1st2nd', 'quiz');
 277          if ($this->get_max_attempts_for_any_override() < 2) {
 278              $mform->hideIf('delay1', 'attempts', 'eq', 1);
 279          }
 280  
 281          $mform->addElement('duration', 'delay2', get_string('delaylater', 'quiz'),
 282                  array('optional' => true));
 283          $mform->addHelpButton('delay2', 'delaylater', 'quiz');
 284          if ($this->get_max_attempts_for_any_override() < 3) {
 285              $mform->hideIf('delay2', 'attempts', 'eq', 1);
 286              $mform->hideIf('delay2', 'attempts', 'eq', 2);
 287          }
 288  
 289          // Browser security choices.
 290          $mform->addElement('select', 'browsersecurity', get_string('browsersecurity', 'quiz'),
 291                  quiz_access_manager::get_browser_security_choices());
 292          $mform->addHelpButton('browsersecurity', 'browsersecurity', 'quiz');
 293  
 294          // Any other rule plugins.
 295          quiz_access_manager::add_settings_form_fields($this, $mform);
 296  
 297          // -------------------------------------------------------------------------------
 298          $mform->addElement('header', 'overallfeedbackhdr', get_string('overallfeedback', 'quiz'));
 299          $mform->addHelpButton('overallfeedbackhdr', 'overallfeedback', 'quiz');
 300  
 301          if (isset($this->current->grade)) {
 302              $needwarning = $this->current->grade === 0;
 303          } else {
 304              $needwarning = $quizconfig->maximumgrade == 0;
 305          }
 306          if ($needwarning) {
 307              $mform->addElement('static', 'nogradewarning', '',
 308                      get_string('nogradewarning', 'quiz'));
 309          }
 310  
 311          $mform->addElement('static', 'gradeboundarystatic1',
 312                  get_string('gradeboundary', 'quiz'), '100%');
 313  
 314          $repeatarray = array();
 315          $repeatedoptions = array();
 316          $repeatarray[] = $mform->createElement('editor', 'feedbacktext',
 317                  get_string('feedback', 'quiz'), array('rows' => 3), array('maxfiles' => EDITOR_UNLIMITED_FILES,
 318                          'noclean' => true, 'context' => $this->context));
 319          $repeatarray[] = $mform->createElement('text', 'feedbackboundaries',
 320                  get_string('gradeboundary', 'quiz'), array('size' => 10));
 321          $repeatedoptions['feedbacktext']['type'] = PARAM_RAW;
 322          $repeatedoptions['feedbackboundaries']['type'] = PARAM_RAW;
 323  
 324          if (!empty($this->_instance)) {
 325              $this->_feedbacks = $DB->get_records('quiz_feedback',
 326                      array('quizid' => $this->_instance), 'mingrade DESC');
 327              $numfeedbacks = count($this->_feedbacks);
 328          } else {
 329              $this->_feedbacks = array();
 330              $numfeedbacks = $quizconfig->initialnumfeedbacks;
 331          }
 332          $numfeedbacks = max($numfeedbacks, 1);
 333  
 334          $nextel = $this->repeat_elements($repeatarray, $numfeedbacks - 1,
 335                  $repeatedoptions, 'boundary_repeats', 'boundary_add_fields', 3,
 336                  get_string('addmoreoverallfeedbacks', 'quiz'), true);
 337  
 338          // Put some extra elements in before the button.
 339          $mform->insertElementBefore($mform->createElement('editor',
 340                  "feedbacktext[$nextel]", get_string('feedback', 'quiz'), array('rows' => 3),
 341                  array('maxfiles' => EDITOR_UNLIMITED_FILES, 'noclean' => true,
 342                        'context' => $this->context)),
 343                  'boundary_add_fields');
 344          $mform->insertElementBefore($mform->createElement('static',
 345                  'gradeboundarystatic2', get_string('gradeboundary', 'quiz'), '0%'),
 346                  'boundary_add_fields');
 347  
 348          // Add the disabledif rules. We cannot do this using the $repeatoptions parameter to
 349          // repeat_elements because we don't want to dissable the first feedbacktext.
 350          for ($i = 0; $i < $nextel; $i++) {
 351              $mform->disabledIf('feedbackboundaries[' . $i . ']', 'grade', 'eq', 0);
 352              $mform->disabledIf('feedbacktext[' . ($i + 1) . ']', 'grade', 'eq', 0);
 353          }
 354  
 355          // -------------------------------------------------------------------------------
 356          $this->standard_coursemodule_elements();
 357  
 358          // Check and act on whether setting outcomes is considered an advanced setting.
 359          $mform->setAdvanced('modoutcomes', !empty($quizconfig->outcomes_adv));
 360  
 361          // The standard_coursemodule_elements method sets this to 100, but the
 362          // quiz has its own setting, so use that.
 363          $mform->setDefault('grade', $quizconfig->maximumgrade);
 364  
 365          // -------------------------------------------------------------------------------
 366          $this->apply_admin_defaults();
 367          $this->add_action_buttons();
 368  
 369          $PAGE->requires->yui_module('moodle-mod_quiz-modform', 'M.mod_quiz.modform.init');
 370      }
 371  
 372      protected function add_review_options_group($mform, $quizconfig, $whenname,
 373              $when, $withhelp = false) {
 374          global $OUTPUT;
 375  
 376          $group = array();
 377          foreach (self::$reviewfields as $field => $string) {
 378              list($identifier, $component) = $string;
 379  
 380              $label = get_string($identifier, $component);
 381              $group[] = $mform->createElement('html', html_writer::start_div('review_option_item'));
 382              $el = $mform->createElement('checkbox', $field . $whenname, '', $label);
 383              if ($withhelp) {
 384                  $el->_helpbutton = $OUTPUT->render(new help_icon($identifier, $component));
 385              }
 386              $group[] = $el;
 387              $group[] = $mform->createElement('html', html_writer::end_div());
 388          }
 389          $mform->addGroup($group, $whenname . 'optionsgrp',
 390                  get_string('review' . $whenname, 'quiz'), null, false);
 391  
 392          foreach (self::$reviewfields as $field => $notused) {
 393              $cfgfield = 'review' . $field;
 394              if ($quizconfig->$cfgfield & $when) {
 395                  $mform->setDefault($field . $whenname, 1);
 396              } else {
 397                  $mform->setDefault($field . $whenname, 0);
 398              }
 399          }
 400  
 401          if ($whenname != 'during') {
 402              $mform->disabledIf('correctness' . $whenname, 'attempt' . $whenname);
 403              $mform->disabledIf('specificfeedback' . $whenname, 'attempt' . $whenname);
 404              $mform->disabledIf('generalfeedback' . $whenname, 'attempt' . $whenname);
 405              $mform->disabledIf('rightanswer' . $whenname, 'attempt' . $whenname);
 406          }
 407      }
 408  
 409      protected function preprocessing_review_settings(&$toform, $whenname, $when) {
 410          foreach (self::$reviewfields as $field => $notused) {
 411              $fieldname = 'review' . $field;
 412              if (array_key_exists($fieldname, $toform)) {
 413                  $toform[$field . $whenname] = $toform[$fieldname] & $when;
 414              }
 415          }
 416      }
 417  
 418      public function data_preprocessing(&$toform) {
 419          if (isset($toform['grade'])) {
 420              // Convert to a real number, so we don't get 0.0000.
 421              $toform['grade'] = $toform['grade'] + 0;
 422          }
 423  
 424          if (count($this->_feedbacks)) {
 425              $key = 0;
 426              foreach ($this->_feedbacks as $feedback) {
 427                  $draftid = file_get_submitted_draft_itemid('feedbacktext['.$key.']');
 428                  $toform['feedbacktext['.$key.']']['text'] = file_prepare_draft_area(
 429                      $draftid,               // Draftid.
 430                      $this->context->id,     // Context.
 431                      'mod_quiz',             // Component.
 432                      'feedback',             // Filarea.
 433                      !empty($feedback->id) ? (int) $feedback->id : null, // Itemid.
 434                      null,
 435                      $feedback->feedbacktext // Text.
 436                  );
 437                  $toform['feedbacktext['.$key.']']['format'] = $feedback->feedbacktextformat;
 438                  $toform['feedbacktext['.$key.']']['itemid'] = $draftid;
 439  
 440                  if ($toform['grade'] == 0) {
 441                      // When a quiz is un-graded, there can only be one lot of
 442                      // feedback. If the quiz previously had a maximum grade and
 443                      // several lots of feedback, we must now avoid putting text
 444                      // into input boxes that are disabled, but which the
 445                      // validation will insist are blank.
 446                      break;
 447                  }
 448  
 449                  if ($feedback->mingrade > 0) {
 450                      $toform['feedbackboundaries['.$key.']'] =
 451                              round(100.0 * $feedback->mingrade / $toform['grade'], 6) . '%';
 452                  }
 453                  $key++;
 454              }
 455          }
 456  
 457          if (isset($toform['timelimit'])) {
 458              $toform['timelimitenable'] = $toform['timelimit'] > 0;
 459          }
 460  
 461          $this->preprocessing_review_settings($toform, 'during',
 462                  mod_quiz_display_options::DURING);
 463          $this->preprocessing_review_settings($toform, 'immediately',
 464                  mod_quiz_display_options::IMMEDIATELY_AFTER);
 465          $this->preprocessing_review_settings($toform, 'open',
 466                  mod_quiz_display_options::LATER_WHILE_OPEN);
 467          $this->preprocessing_review_settings($toform, 'closed',
 468                  mod_quiz_display_options::AFTER_CLOSE);
 469          $toform['attemptduring'] = true;
 470          $toform['overallfeedbackduring'] = false;
 471  
 472          // Password field - different in form to stop browsers that remember
 473          // passwords from getting confused.
 474          if (isset($toform['password'])) {
 475              $toform['quizpassword'] = $toform['password'];
 476              unset($toform['password']);
 477          }
 478  
 479          // Load any settings belonging to the access rules.
 480          if (!empty($toform['instance'])) {
 481              $accesssettings = quiz_access_manager::load_settings($toform['instance']);
 482              foreach ($accesssettings as $name => $value) {
 483                  $toform[$name] = $value;
 484              }
 485          }
 486  
 487          if (empty($toform['completionminattempts'])) {
 488              $toform['completionminattempts'] = 1;
 489          } else {
 490              $toform['completionminattemptsenabled'] = $toform['completionminattempts'] > 0;
 491          }
 492      }
 493  
 494      /**
 495       * Allows module to modify the data returned by form get_data().
 496       * This method is also called in the bulk activity completion form.
 497       *
 498       * Only available on moodleform_mod.
 499       *
 500       * @param stdClass $data the form data to be modified.
 501       */
 502      public function data_postprocessing($data) {
 503          parent::data_postprocessing($data);
 504          if (!empty($data->completionunlocked)) {
 505              // Turn off completion settings if the checkboxes aren't ticked.
 506              $autocompletion = !empty($data->completion) && $data->completion == COMPLETION_TRACKING_AUTOMATIC;
 507              if (empty($data->completionminattemptsenabled) || !$autocompletion) {
 508                  $data->completionminattempts = 0;
 509              }
 510          }
 511      }
 512  
 513      public function validation($data, $files) {
 514          $errors = parent::validation($data, $files);
 515  
 516          // Check open and close times are consistent.
 517          if ($data['timeopen'] != 0 && $data['timeclose'] != 0 &&
 518                  $data['timeclose'] < $data['timeopen']) {
 519              $errors['timeclose'] = get_string('closebeforeopen', 'quiz');
 520          }
 521  
 522          // Check that the grace period is not too short.
 523          if ($data['overduehandling'] == 'graceperiod') {
 524              $graceperiodmin = get_config('quiz', 'graceperiodmin');
 525              if ($data['graceperiod'] <= $graceperiodmin) {
 526                  $errors['graceperiod'] = get_string('graceperiodtoosmall', 'quiz', format_time($graceperiodmin));
 527              }
 528          }
 529  
 530          if (!empty($data['completionminattempts'])) {
 531              if ($data['attempts'] > 0 && $data['completionminattempts'] > $data['attempts']) {
 532                  $errors['completionminattemptsgroup'] = get_string('completionminattemptserror', 'quiz');
 533              }
 534          }
 535  
 536          // Check the boundary value is a number or a percentage, and in range.
 537          $i = 0;
 538          while (!empty($data['feedbackboundaries'][$i] )) {
 539              $boundary = trim($data['feedbackboundaries'][$i]);
 540              if (strlen($boundary) > 0) {
 541                  if ($boundary[strlen($boundary) - 1] == '%') {
 542                      $boundary = trim(substr($boundary, 0, -1));
 543                      if (is_numeric($boundary)) {
 544                          $boundary = $boundary * $data['grade'] / 100.0;
 545                      } else {
 546                          $errors["feedbackboundaries[$i]"] =
 547                                  get_string('feedbackerrorboundaryformat', 'quiz', $i + 1);
 548                      }
 549                  } else if (!is_numeric($boundary)) {
 550                      $errors["feedbackboundaries[$i]"] =
 551                              get_string('feedbackerrorboundaryformat', 'quiz', $i + 1);
 552                  }
 553              }
 554              if (is_numeric($boundary) && $boundary <= 0 || $boundary >= $data['grade'] ) {
 555                  $errors["feedbackboundaries[$i]"] =
 556                          get_string('feedbackerrorboundaryoutofrange', 'quiz', $i + 1);
 557              }
 558              if (is_numeric($boundary) && $i > 0 &&
 559                      $boundary >= $data['feedbackboundaries'][$i - 1]) {
 560                  $errors["feedbackboundaries[$i]"] =
 561                          get_string('feedbackerrororder', 'quiz', $i + 1);
 562              }
 563              $data['feedbackboundaries'][$i] = $boundary;
 564              $i += 1;
 565          }
 566          $numboundaries = $i;
 567  
 568          // Check there is nothing in the remaining unused fields.
 569          if (!empty($data['feedbackboundaries'])) {
 570              for ($i = $numboundaries; $i < count($data['feedbackboundaries']); $i += 1) {
 571                  if (!empty($data['feedbackboundaries'][$i] ) &&
 572                          trim($data['feedbackboundaries'][$i] ) != '') {
 573                      $errors["feedbackboundaries[$i]"] =
 574                              get_string('feedbackerrorjunkinboundary', 'quiz', $i + 1);
 575                  }
 576              }
 577          }
 578          for ($i = $numboundaries + 1; $i < count($data['feedbacktext']); $i += 1) {
 579              if (!empty($data['feedbacktext'][$i]['text']) &&
 580                      trim($data['feedbacktext'][$i]['text'] ) != '') {
 581                  $errors["feedbacktext[$i]"] =
 582                          get_string('feedbackerrorjunkinfeedback', 'quiz', $i + 1);
 583              }
 584          }
 585  
 586          // If CBM is involved, don't show the warning for grade to pass being larger than the maximum grade.
 587          if (($data['preferredbehaviour'] == 'deferredcbm') OR ($data['preferredbehaviour'] == 'immediatecbm')) {
 588              unset($errors['gradepass']);
 589          }
 590          // Any other rule plugins.
 591          $errors = quiz_access_manager::validate_settings_form_fields($errors, $data, $files, $this);
 592  
 593          return $errors;
 594      }
 595  
 596      /**
 597       * Display module-specific activity completion rules.
 598       * Part of the API defined by moodleform_mod
 599       * @return array Array of string IDs of added items, empty array if none
 600       */
 601      public function add_completion_rules() {
 602          $mform = $this->_form;
 603          $items = array();
 604  
 605          $mform->addElement('advcheckbox', 'completionattemptsexhausted', null,
 606              get_string('completionattemptsexhausted', 'quiz'),
 607              array('group' => 'cattempts'));
 608          $mform->disabledIf('completionattemptsexhausted', 'completionpassgrade', 'notchecked');
 609          $items[] = 'completionattemptsexhausted';
 610  
 611          $group = array();
 612          $group[] = $mform->createElement('checkbox', 'completionminattemptsenabled', '',
 613              get_string('completionminattempts', 'quiz'));
 614          $group[] = $mform->createElement('text', 'completionminattempts', '', array('size' => 3));
 615          $mform->setType('completionminattempts', PARAM_INT);
 616          $mform->addGroup($group, 'completionminattemptsgroup', get_string('completionminattemptsgroup', 'quiz'), array(' '), false);
 617          $mform->disabledIf('completionminattempts', 'completionminattemptsenabled', 'notchecked');
 618  
 619          $items[] = 'completionminattemptsgroup';
 620  
 621          return $items;
 622      }
 623  
 624      /**
 625       * Called during validation. Indicates whether a module-specific completion rule is selected.
 626       *
 627       * @param array $data Input data (not yet validated)
 628       * @return bool True if one or more rules is enabled, false if none are.
 629       */
 630      public function completion_rule_enabled($data) {
 631          return  !empty($data['completionattemptsexhausted']) ||
 632                  !empty($data['completionminattemptsenabled']);
 633      }
 634  
 635      /**
 636       * Get the maximum number of attempts that anyone might have due to a user
 637       * or group override. Used to decide whether disabledIf rules should be applied.
 638       * @return int the number of attempts allowed. For the purpose of this method,
 639       * unlimited is returned as 1000, not 0.
 640       */
 641      public function get_max_attempts_for_any_override() {
 642          global $DB;
 643  
 644          if (empty($this->_instance)) {
 645              // Quiz not created yet, so no overrides.
 646              return 1;
 647          }
 648  
 649          if ($this->maxattemptsanyoverride === null) {
 650              $this->maxattemptsanyoverride = $DB->get_field_sql("
 651                      SELECT MAX(CASE WHEN attempts = 0 THEN 1000 ELSE attempts END)
 652                        FROM {quiz_overrides}
 653                       WHERE quiz = ?",
 654                      array($this->_instance));
 655              if ($this->maxattemptsanyoverride < 1) {
 656                  // This happens when no override alters the number of attempts.
 657                  $this->maxattemptsanyoverride = 1;
 658              }
 659          }
 660  
 661          return $this->maxattemptsanyoverride;
 662      }
 663  }