Search moodle.org's
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 401] [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 renderer for the quiz module.
  19   *
  20   * @package   mod_quiz
  21   * @copyright 2011 The Open University
  22   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  
  26  defined('MOODLE_INTERNAL') || die();
  27  
  28  
  29  /**
  30   * The renderer for the quiz module.
  31   *
  32   * @copyright  2011 The Open University
  33   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  34   */
  35  class mod_quiz_renderer extends plugin_renderer_base {
  36      /**
  37       * Builds the review page
  38       *
  39       * @param quiz_attempt $attemptobj an instance of quiz_attempt.
  40       * @param array $slots an array of intgers relating to questions.
  41       * @param int $page the current page number
  42       * @param bool $showall whether to show entire attempt on one page.
  43       * @param bool $lastpage if true the current page is the last page.
  44       * @param mod_quiz_display_options $displayoptions instance of mod_quiz_display_options.
  45       * @param array $summarydata contains all table data
  46       * @return $output containing html data.
  47       */
  48      public function review_page(quiz_attempt $attemptobj, $slots, $page, $showall,
  49                                  $lastpage, mod_quiz_display_options $displayoptions,
  50                                  $summarydata) {
  51  
  52          $output = '';
  53          $output .= $this->header();
  54          $output .= $this->review_summary_table($summarydata, $page);
  55          $output .= $this->review_form($page, $showall, $displayoptions,
  56                  $this->questions($attemptobj, true, $slots, $page, $showall, $displayoptions),
  57                  $attemptobj);
  58  
  59          $output .= $this->review_next_navigation($attemptobj, $page, $lastpage, $showall);
  60          $output .= $this->footer();
  61          return $output;
  62      }
  63  
  64      /**
  65       * Renders the review question pop-up.
  66       *
  67       * @param quiz_attempt $attemptobj an instance of quiz_attempt.
  68       * @param int $slot which question to display.
  69       * @param int $seq which step of the question attempt to show. null = latest.
  70       * @param mod_quiz_display_options $displayoptions instance of mod_quiz_display_options.
  71       * @param array $summarydata contains all table data
  72       * @return $output containing html data.
  73       */
  74      public function review_question_page(quiz_attempt $attemptobj, $slot, $seq,
  75              mod_quiz_display_options $displayoptions, $summarydata) {
  76  
  77          $output = '';
  78          $output .= $this->header();
  79          $output .= $this->review_summary_table($summarydata, 0);
  80  
  81          if (!is_null($seq)) {
  82              $output .= $attemptobj->render_question_at_step($slot, $seq, true, $this);
  83          } else {
  84              $output .= $attemptobj->render_question($slot, true, $this);
  85          }
  86  
  87          $output .= $this->close_window_button();
  88          $output .= $this->footer();
  89          return $output;
  90      }
  91  
  92      /**
  93       * Renders the review question pop-up.
  94       *
  95       * @param quiz_attempt $attemptobj an instance of quiz_attempt.
  96       * @param string $message Why the review is not allowed.
  97       * @return string html to output.
  98       */
  99      public function review_question_not_allowed(quiz_attempt $attemptobj, $message) {
 100          $output = '';
 101          $output .= $this->header();
 102          $output .= $this->heading(format_string($attemptobj->get_quiz_name(), true,
 103                                    array("context" => $attemptobj->get_quizobj()->get_context())));
 104          $output .= $this->notification($message);
 105          $output .= $this->close_window_button();
 106          $output .= $this->footer();
 107          return $output;
 108      }
 109  
 110      /**
 111       * Filters the summarydata array.
 112       *
 113       * @param array $summarydata contains row data for table
 114       * @param int $page the current page number
 115       * @return $summarydata containing filtered row data
 116       */
 117      protected function filter_review_summary_table($summarydata, $page) {
 118          if ($page == 0) {
 119              return $summarydata;
 120          }
 121  
 122          // Only show some of summary table on subsequent pages.
 123          foreach ($summarydata as $key => $rowdata) {
 124              if (!in_array($key, array('user', 'attemptlist'))) {
 125                  unset($summarydata[$key]);
 126              }
 127          }
 128  
 129          return $summarydata;
 130      }
 131  
 132      /**
 133       * Outputs the table containing data from summary data array
 134       *
 135       * @param array $summarydata contains row data for table
 136       * @param int $page contains the current page number
 137       */
 138      public function review_summary_table($summarydata, $page) {
 139          $summarydata = $this->filter_review_summary_table($summarydata, $page);
 140          if (empty($summarydata)) {
 141              return '';
 142          }
 143  
 144          $output = '';
 145          $output .= html_writer::start_tag('table', array(
 146                  'class' => 'generaltable generalbox quizreviewsummary'));
 147          $output .= html_writer::start_tag('tbody');
 148          foreach ($summarydata as $rowdata) {
 149              if ($rowdata['title'] instanceof renderable) {
 150                  $title = $this->render($rowdata['title']);
 151              } else {
 152                  $title = $rowdata['title'];
 153              }
 154  
 155              if ($rowdata['content'] instanceof renderable) {
 156                  $content = $this->render($rowdata['content']);
 157              } else {
 158                  $content = $rowdata['content'];
 159              }
 160  
 161              $output .= html_writer::tag('tr',
 162                  html_writer::tag('th', $title, array('class' => 'cell', 'scope' => 'row')) .
 163                          html_writer::tag('td', $content, array('class' => 'cell'))
 164              );
 165          }
 166  
 167          $output .= html_writer::end_tag('tbody');
 168          $output .= html_writer::end_tag('table');
 169          return $output;
 170      }
 171  
 172      /**
 173       * Renders each question
 174       *
 175       * @param quiz_attempt $attemptobj instance of quiz_attempt
 176       * @param bool $reviewing
 177       * @param array $slots array of intgers relating to questions
 178       * @param int $page current page number
 179       * @param bool $showall if true shows attempt on single page
 180       * @param mod_quiz_display_options $displayoptions instance of mod_quiz_display_options
 181       */
 182      public function questions(quiz_attempt $attemptobj, $reviewing, $slots, $page, $showall,
 183                                mod_quiz_display_options $displayoptions) {
 184          $output = '';
 185          foreach ($slots as $slot) {
 186              $output .= $attemptobj->render_question($slot, $reviewing, $this,
 187                      $attemptobj->review_url($slot, $page, $showall));
 188          }
 189          return $output;
 190      }
 191  
 192      /**
 193       * Renders the main bit of the review page.
 194       *
 195       * @param array $summarydata contain row data for table
 196       * @param int $page current page number
 197       * @param mod_quiz_display_options $displayoptions instance of mod_quiz_display_options
 198       * @param $content contains each question
 199       * @param quiz_attempt $attemptobj instance of quiz_attempt
 200       * @param bool $showall if true display attempt on one page
 201       */
 202      public function review_form($page, $showall, $displayoptions, $content, $attemptobj) {
 203          if ($displayoptions->flags != question_display_options::EDITABLE) {
 204              return $content;
 205          }
 206  
 207          $this->page->requires->js_init_call('M.mod_quiz.init_review_form', null, false,
 208                  quiz_get_js_module());
 209  
 210          $output = '';
 211          $output .= html_writer::start_tag('form', array('action' => $attemptobj->review_url(null,
 212                  $page, $showall), 'method' => 'post', 'class' => 'questionflagsaveform'));
 213          $output .= html_writer::start_tag('div');
 214          $output .= $content;
 215          $output .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'sesskey',
 216                  'value' => sesskey()));
 217          $output .= html_writer::start_tag('div', array('class' => 'submitbtns'));
 218          $output .= html_writer::empty_tag('input', array('type' => 'submit',
 219                  'class' => 'questionflagsavebutton btn btn-secondary', 'name' => 'savingflags',
 220                  'value' => get_string('saveflags', 'question')));
 221          $output .= html_writer::end_tag('div');
 222          $output .= html_writer::end_tag('div');
 223          $output .= html_writer::end_tag('form');
 224  
 225          return $output;
 226      }
 227  
 228      /**
 229       * Returns either a liink or button
 230       *
 231       * @param quiz_attempt $attemptobj instance of quiz_attempt
 232       */
 233      public function finish_review_link(quiz_attempt $attemptobj) {
 234          $url = $attemptobj->view_url();
 235  
 236          if ($attemptobj->get_access_manager(time())->attempt_must_be_in_popup()) {
 237              $this->page->requires->js_init_call('M.mod_quiz.secure_window.init_close_button',
 238                      array($url), false, quiz_get_js_module());
 239              return html_writer::empty_tag('input', array('type' => 'button',
 240                      'value' => get_string('finishreview', 'quiz'),
 241                      'id' => 'secureclosebutton',
 242                      'class' => 'mod_quiz-next-nav btn btn-primary'));
 243  
 244          } else {
 245              return html_writer::link($url, get_string('finishreview', 'quiz'),
 246                      array('class' => 'mod_quiz-next-nav'));
 247          }
 248      }
 249  
 250      /**
 251       * Creates the navigation links/buttons at the bottom of the reivew attempt page.
 252       *
 253       * Note, the name of this function is no longer accurate, but when the design
 254       * changed, it was decided to keep the old name for backwards compatibility.
 255       *
 256       * @param quiz_attempt $attemptobj instance of quiz_attempt
 257       * @param int $page the current page
 258       * @param bool $lastpage if true current page is the last page
 259       * @param bool|null $showall if true, the URL will be to review the entire attempt on one page,
 260       *      and $page will be ignored. If null, a sensible default will be chosen.
 261       *
 262       * @return string HTML fragment.
 263       */
 264      public function review_next_navigation(quiz_attempt $attemptobj, $page, $lastpage, $showall = null) {
 265          $nav = '';
 266          if ($page > 0) {
 267              $nav .= link_arrow_left(get_string('navigateprevious', 'quiz'),
 268                      $attemptobj->review_url(null, $page - 1, $showall), false, 'mod_quiz-prev-nav');
 269          }
 270          if ($lastpage) {
 271              $nav .= $this->finish_review_link($attemptobj);
 272          } else {
 273              $nav .= link_arrow_right(get_string('navigatenext', 'quiz'),
 274                      $attemptobj->review_url(null, $page + 1, $showall), false, 'mod_quiz-next-nav');
 275          }
 276          return html_writer::tag('div', $nav, array('class' => 'submitbtns'));
 277      }
 278  
 279      /**
 280       * Return the HTML of the quiz timer.
 281       * @return string HTML content.
 282       */
 283      public function countdown_timer(quiz_attempt $attemptobj, $timenow) {
 284  
 285          $timeleft = $attemptobj->get_time_left_display($timenow);
 286          if ($timeleft !== false) {
 287              $ispreview = $attemptobj->is_preview();
 288              $timerstartvalue = $timeleft;
 289              if (!$ispreview) {
 290                  // Make sure the timer starts just above zero. If $timeleft was <= 0, then
 291                  // this will just have the effect of causing the quiz to be submitted immediately.
 292                  $timerstartvalue = max($timerstartvalue, 1);
 293              }
 294              $this->initialise_timer($timerstartvalue, $ispreview);
 295          }
 296  
 297  
 298          return $this->output->render_from_template('mod_quiz/timer', (object)[]);
 299      }
 300  
 301      /**
 302       * Create a preview link
 303       *
 304       * @param moodle_url $url contains a url to the given page
 305       */
 306      public function restart_preview_button($url) {
 307          return $this->single_button($url, get_string('startnewpreview', 'quiz'));
 308      }
 309  
 310      /**
 311       * Outputs the navigation block panel
 312       *
 313       * @param quiz_nav_panel_base $panel instance of quiz_nav_panel_base
 314       */
 315      public function navigation_panel(quiz_nav_panel_base $panel) {
 316  
 317          $output = '';
 318          $userpicture = $panel->user_picture();
 319          if ($userpicture) {
 320              $fullname = fullname($userpicture->user);
 321              if ($userpicture->size === true) {
 322                  $fullname = html_writer::div($fullname);
 323              }
 324              $output .= html_writer::tag('div', $this->render($userpicture) . $fullname,
 325                      array('id' => 'user-picture', 'class' => 'clearfix'));
 326          }
 327          $output .= $panel->render_before_button_bits($this);
 328  
 329          $bcc = $panel->get_button_container_class();
 330          $output .= html_writer::start_tag('div', array('class' => "qn_buttons clearfix $bcc"));
 331          foreach ($panel->get_question_buttons() as $button) {
 332              $output .= $this->render($button);
 333          }
 334          $output .= html_writer::end_tag('div');
 335  
 336          $output .= html_writer::tag('div', $panel->render_end_bits($this),
 337                  array('class' => 'othernav'));
 338  
 339          $this->page->requires->js_init_call('M.mod_quiz.nav.init', null, false,
 340                  quiz_get_js_module());
 341  
 342          return $output;
 343      }
 344  
 345      /**
 346       * Display a quiz navigation button.
 347       *
 348       * @param quiz_nav_question_button $button
 349       * @return string HTML fragment.
 350       */
 351      protected function render_quiz_nav_question_button(quiz_nav_question_button $button) {
 352          $classes = array('qnbutton', $button->stateclass, $button->navmethod, 'btn');
 353          $extrainfo = array();
 354  
 355          if ($button->currentpage) {
 356              $classes[] = 'thispage';
 357              $extrainfo[] = get_string('onthispage', 'quiz');
 358          }
 359  
 360          // Flagged?
 361          if ($button->flagged) {
 362              $classes[] = 'flagged';
 363              $flaglabel = get_string('flagged', 'question');
 364          } else {
 365              $flaglabel = '';
 366          }
 367          $extrainfo[] = html_writer::tag('span', $flaglabel, array('class' => 'flagstate'));
 368  
 369          if (is_numeric($button->number)) {
 370              $qnostring = 'questionnonav';
 371          } else {
 372              $qnostring = 'questionnonavinfo';
 373          }
 374  
 375          $a = new stdClass();
 376          $a->number = $button->number;
 377          $a->attributes = implode(' ', $extrainfo);
 378          $tagcontents = html_writer::tag('span', '', array('class' => 'thispageholder')) .
 379                          html_writer::tag('span', '', array('class' => 'trafficlight')) .
 380                          get_string($qnostring, 'quiz', $a);
 381          $tagattributes = array('class' => implode(' ', $classes), 'id' => $button->id,
 382                                    'title' => $button->statestring, 'data-quiz-page' => $button->page);
 383  
 384          if ($button->url) {
 385              return html_writer::link($button->url, $tagcontents, $tagattributes);
 386          } else {
 387              return html_writer::tag('span', $tagcontents, $tagattributes);
 388          }
 389      }
 390  
 391      /**
 392       * Display a quiz navigation heading.
 393       *
 394       * @param quiz_nav_section_heading $heading the heading.
 395       * @return string HTML fragment.
 396       */
 397      protected function render_quiz_nav_section_heading(quiz_nav_section_heading $heading) {
 398          if (empty($heading->heading)) {
 399              $headingtext = get_string('sectionnoname', 'quiz');
 400              $class = ' dimmed_text';
 401          } else {
 402              $headingtext = $heading->heading;
 403              $class = '';
 404          }
 405          return $this->heading($headingtext, 3, 'mod_quiz-section-heading' . $class);
 406      }
 407  
 408      /**
 409       * outputs the link the other attempts.
 410       *
 411       * @param mod_quiz_links_to_other_attempts $links
 412       */
 413      protected function render_mod_quiz_links_to_other_attempts(
 414              mod_quiz_links_to_other_attempts $links) {
 415          $attemptlinks = array();
 416          foreach ($links->links as $attempt => $url) {
 417              if (!$url) {
 418                  $attemptlinks[] = html_writer::tag('strong', $attempt);
 419              } else if ($url instanceof renderable) {
 420                  $attemptlinks[] = $this->render($url);
 421              } else {
 422                  $attemptlinks[] = html_writer::link($url, $attempt);
 423              }
 424          }
 425          return implode(', ', $attemptlinks);
 426      }
 427  
 428      public function start_attempt_page(quiz $quizobj, mod_quiz_preflight_check_form $mform) {
 429          $output = '';
 430          $output .= $this->header();
 431          $output .= $this->during_attempt_tertiary_nav($quizobj->view_url());
 432          $output .= $this->heading(format_string($quizobj->get_quiz_name(), true,
 433                                    array("context" => $quizobj->get_context())));
 434          $output .= $this->quiz_intro($quizobj->get_quiz(), $quizobj->get_cm());
 435          $output .= $mform->render();
 436          $output .= $this->footer();
 437          return $output;
 438      }
 439  
 440      /**
 441       * Attempt Page
 442       *
 443       * @param quiz_attempt $attemptobj Instance of quiz_attempt
 444       * @param int $page Current page number
 445       * @param quiz_access_manager $accessmanager Instance of quiz_access_manager
 446       * @param array $messages An array of messages
 447       * @param array $slots Contains an array of integers that relate to questions
 448       * @param int $id The ID of an attempt
 449       * @param int $nextpage The number of the next page
 450       * @return string HTML to output.
 451       */
 452      public function attempt_page($attemptobj, $page, $accessmanager, $messages, $slots, $id,
 453              $nextpage) {
 454          $output = '';
 455          $output .= $this->header();
 456          $output .= $this->during_attempt_tertiary_nav($attemptobj->view_url());
 457          $output .= $this->quiz_notices($messages);
 458          $output .= $this->countdown_timer($attemptobj, time());
 459          $output .= $this->attempt_form($attemptobj, $page, $slots, $id, $nextpage);
 460          $output .= $this->footer();
 461          return $output;
 462      }
 463  
 464      /**
 465       * Render the tertiary navigation for pages during the attempt.
 466       *
 467       * @param string|moodle_url $quizviewurl url of the view.php page for this quiz.
 468       * @return string HTML to output.
 469       */
 470      public function during_attempt_tertiary_nav($quizviewurl): string {
 471          $output = '';
 472          $output .= html_writer::start_div('container-fluid tertiary-navigation');
 473          $output .= html_writer::start_div('row');
 474          $output .= html_writer::start_div('navitem');
 475          $output .= html_writer::link($quizviewurl, get_string('back'),
 476                  ['class' => 'btn btn-secondary']);
 477          $output .= html_writer::end_div();
 478          $output .= html_writer::end_div();
 479          $output .= html_writer::end_div();
 480          return $output;
 481      }
 482  
 483      /**
 484       * Returns any notices.
 485       *
 486       * @param array $messages
 487       */
 488      public function quiz_notices($messages) {
 489          if (!$messages) {
 490              return '';
 491          }
 492          return $this->notification(
 493              html_writer::tag('p', get_string('accessnoticesheader', 'quiz')) . $this->access_messages($messages),
 494              'warning',
 495              false
 496          );
 497      }
 498  
 499      /**
 500       * Ouputs the form for making an attempt
 501       *
 502       * @param quiz_attempt $attemptobj
 503       * @param int $page Current page number
 504       * @param array $slots Array of integers relating to questions
 505       * @param int $id ID of the attempt
 506       * @param int $nextpage Next page number
 507       */
 508      public function attempt_form($attemptobj, $page, $slots, $id, $nextpage) {
 509          $output = '';
 510  
 511          // Start the form.
 512          $output .= html_writer::start_tag('form',
 513                  array('action' => new moodle_url($attemptobj->processattempt_url(),
 514                  array('cmid' => $attemptobj->get_cmid())), 'method' => 'post',
 515                  'enctype' => 'multipart/form-data', 'accept-charset' => 'utf-8',
 516                  'id' => 'responseform'));
 517          $output .= html_writer::start_tag('div');
 518  
 519          // Print all the questions.
 520          foreach ($slots as $slot) {
 521              $output .= $attemptobj->render_question($slot, false, $this,
 522                      $attemptobj->attempt_url($slot, $page), $this);
 523          }
 524  
 525          $navmethod = $attemptobj->get_quiz()->navmethod;
 526          $output .= $this->attempt_navigation_buttons($page, $attemptobj->is_last_page($page), $navmethod);
 527  
 528          // Some hidden fields to trach what is going on.
 529          $output .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'attempt',
 530                  'value' => $attemptobj->get_attemptid()));
 531          $output .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'thispage',
 532                  'value' => $page, 'id' => 'followingpage'));
 533          $output .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'nextpage',
 534                  'value' => $nextpage));
 535          $output .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'timeup',
 536                  'value' => '0', 'id' => 'timeup'));
 537          $output .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'sesskey',
 538                  'value' => sesskey()));
 539          $output .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'scrollpos',
 540                  'value' => '', 'id' => 'scrollpos'));
 541  
 542          // Add a hidden field with questionids. Do this at the end of the form, so
 543          // if you navigate before the form has finished loading, it does not wipe all
 544          // the student's answers.
 545          $output .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'slots',
 546                  'value' => implode(',', $attemptobj->get_active_slots($page))));
 547  
 548          // Finish the form.
 549          $output .= html_writer::end_tag('div');
 550          $output .= html_writer::end_tag('form');
 551  
 552          $output .= $this->connection_warning();
 553  
 554          return $output;
 555      }
 556  
 557      /**
 558       * Display the prev/next buttons that go at the bottom of each page of the attempt.
 559       *
 560       * @param int $page the page number. Starts at 0 for the first page.
 561       * @param bool $lastpage is this the last page in the quiz?
 562       * @param string $navmethod Optional quiz attribute, 'free' (default) or 'sequential'
 563       * @return string HTML fragment.
 564       */
 565      protected function attempt_navigation_buttons($page, $lastpage, $navmethod = 'free') {
 566          $output = '';
 567  
 568          $output .= html_writer::start_tag('div', array('class' => 'submitbtns'));
 569          if ($page > 0 && $navmethod == 'free') {
 570              $output .= html_writer::empty_tag('input', array('type' => 'submit', 'name' => 'previous',
 571                      'value' => get_string('navigateprevious', 'quiz'), 'class' => 'mod_quiz-prev-nav btn btn-secondary',
 572                      'id' => 'mod_quiz-prev-nav'));
 573              $this->page->requires->js_call_amd('core_form/submit', 'init', ['mod_quiz-prev-nav']);
 574          }
 575          if ($lastpage) {
 576              $nextlabel = get_string('endtest', 'quiz');
 577          } else {
 578              $nextlabel = get_string('navigatenext', 'quiz');
 579          }
 580          $output .= html_writer::empty_tag('input', array('type' => 'submit', 'name' => 'next',
 581                  'value' => $nextlabel, 'class' => 'mod_quiz-next-nav btn btn-primary', 'id' => 'mod_quiz-next-nav'));
 582          $output .= html_writer::end_tag('div');
 583          $this->page->requires->js_call_amd('core_form/submit', 'init', ['mod_quiz-next-nav']);
 584  
 585          return $output;
 586      }
 587  
 588      /**
 589       * Render a button which allows students to redo a question in the attempt.
 590       *
 591       * @param int $slot the number of the slot to generate the button for.
 592       * @param bool $disabled if true, output the button disabled.
 593       * @return string HTML fragment.
 594       */
 595      public function redo_question_button($slot, $disabled) {
 596          $attributes = array('type' => 'submit',  'name' => 'redoslot' . $slot,
 597              'value' => get_string('redoquestion', 'quiz'),
 598              'class' => 'mod_quiz-redo_question_button btn btn-secondary');
 599          if ($disabled) {
 600              $attributes['disabled'] = 'disabled';
 601          }
 602          return html_writer::div(html_writer::empty_tag('input', $attributes));
 603      }
 604  
 605      /**
 606       * Output the JavaScript required to initialise the countdown timer.
 607       * @param int $timerstartvalue time remaining, in seconds.
 608       */
 609      public function initialise_timer($timerstartvalue, $ispreview) {
 610          $options = array($timerstartvalue, (bool)$ispreview);
 611          $this->page->requires->js_init_call('M.mod_quiz.timer.init', $options, false, quiz_get_js_module());
 612      }
 613  
 614      /**
 615       * Output a page with an optional message, and JavaScript code to close the
 616       * current window and redirect the parent window to a new URL.
 617       * @param moodle_url $url the URL to redirect the parent window to.
 618       * @param string $message message to display before closing the window. (optional)
 619       * @return string HTML to output.
 620       */
 621      public function close_attempt_popup($url, $message = '') {
 622          $output = '';
 623          $output .= $this->header();
 624          $output .= $this->box_start();
 625  
 626          if ($message) {
 627              $output .= html_writer::tag('p', $message);
 628              $output .= html_writer::tag('p', get_string('windowclosing', 'quiz'));
 629              $delay = 5;
 630          } else {
 631              $output .= html_writer::tag('p', get_string('pleaseclose', 'quiz'));
 632              $delay = 0;
 633          }
 634          $this->page->requires->js_init_call('M.mod_quiz.secure_window.close',
 635                  array($url, $delay), false, quiz_get_js_module());
 636  
 637          $output .= $this->box_end();
 638          $output .= $this->footer();
 639          return $output;
 640      }
 641  
 642      /**
 643       * Print each message in an array, surrounded by &lt;p>, &lt;/p> tags.
 644       *
 645       * @param array $messages the array of message strings.
 646       * @param bool $return if true, return a string, instead of outputting.
 647       *
 648       * @return string HTML to output.
 649       */
 650      public function access_messages($messages) {
 651          $output = '';
 652          foreach ($messages as $message) {
 653              $output .= html_writer::tag('p', $message, ['class' => 'text-left']);
 654          }
 655          return $output;
 656      }
 657  
 658      /*
 659       * Summary Page
 660       */
 661      /**
 662       * Create the summary page
 663       *
 664       * @param quiz_attempt $attemptobj
 665       * @param mod_quiz_display_options $displayoptions
 666       */
 667      public function summary_page($attemptobj, $displayoptions) {
 668          $output = '';
 669          $output .= $this->header();
 670          $output .= $this->during_attempt_tertiary_nav($attemptobj->view_url());
 671          $output .= $this->heading(format_string($attemptobj->get_quiz_name()));
 672          $output .= $this->heading(get_string('summaryofattempt', 'quiz'), 3);
 673          $output .= $this->summary_table($attemptobj, $displayoptions);
 674          $output .= $this->summary_page_controls($attemptobj);
 675          $output .= $this->footer();
 676          return $output;
 677      }
 678  
 679      /**
 680       * Generates the table of summarydata
 681       *
 682       * @param quiz_attempt $attemptobj
 683       * @param mod_quiz_display_options $displayoptions
 684       */
 685      public function summary_table($attemptobj, $displayoptions) {
 686          // Prepare the summary table header.
 687          $table = new html_table();
 688          $table->attributes['class'] = 'generaltable quizsummaryofattempt boxaligncenter';
 689          $table->head = array(get_string('question', 'quiz'), get_string('status', 'quiz'));
 690          $table->align = array('left', 'left');
 691          $table->size = array('', '');
 692          $markscolumn = $displayoptions->marks >= question_display_options::MARK_AND_MAX;
 693          if ($markscolumn) {
 694              $table->head[] = get_string('marks', 'quiz');
 695              $table->align[] = 'left';
 696              $table->size[] = '';
 697          }
 698          $tablewidth = count($table->align);
 699          $table->data = array();
 700  
 701          // Get the summary info for each question.
 702          $slots = $attemptobj->get_slots();
 703          foreach ($slots as $slot) {
 704              // Add a section headings if we need one here.
 705              $heading = $attemptobj->get_heading_before_slot($slot);
 706              if ($heading !== null) {
 707                  // There is a heading here.
 708                  $rowclasses = 'quizsummaryheading';
 709                  if ($heading) {
 710                      $heading = format_string($heading);
 711                  } else if (count($attemptobj->get_quizobj()->get_sections()) > 1) {
 712                      // If this is the start of an unnamed section, and the quiz has more
 713                      // than one section, then add a default heading.
 714                      $heading = get_string('sectionnoname', 'quiz');
 715                      $rowclasses .= ' dimmed_text';
 716                  }
 717                  $cell = new html_table_cell(format_string($heading));
 718                  $cell->header = true;
 719                  $cell->colspan = $tablewidth;
 720                  $table->data[] = array($cell);
 721                  $table->rowclasses[] = $rowclasses;
 722              }
 723  
 724              // Don't display information items.
 725              if (!$attemptobj->is_real_question($slot)) {
 726                  continue;
 727              }
 728  
 729              // Real question, show it.
 730              $flag = '';
 731              if ($attemptobj->is_question_flagged($slot)) {
 732                  // Quiz has custom JS manipulating these image tags - so we can't use the pix_icon method here.
 733                  $flag = html_writer::empty_tag('img', array('src' => $this->image_url('i/flagged'),
 734                          'alt' => get_string('flagged', 'question'), 'class' => 'questionflag icon-post'));
 735              }
 736              if ($attemptobj->can_navigate_to($slot)) {
 737                  $row = array(html_writer::link($attemptobj->attempt_url($slot),
 738                          $attemptobj->get_question_number($slot) . $flag),
 739                          $attemptobj->get_question_status($slot, $displayoptions->correctness));
 740              } else {
 741                  $row = array($attemptobj->get_question_number($slot) . $flag,
 742                                  $attemptobj->get_question_status($slot, $displayoptions->correctness));
 743              }
 744              if ($markscolumn) {
 745                  $row[] = $attemptobj->get_question_mark($slot);
 746              }
 747              $table->data[] = $row;
 748              $table->rowclasses[] = 'quizsummary' . $slot . ' ' . $attemptobj->get_question_state_class(
 749                      $slot, $displayoptions->correctness);
 750          }
 751  
 752          // Print the summary table.
 753          $output = html_writer::table($table);
 754  
 755          return $output;
 756      }
 757  
 758      /**
 759       * Creates any controls a the page should have.
 760       *
 761       * @param quiz_attempt $attemptobj
 762       */
 763      public function summary_page_controls($attemptobj) {
 764          $output = '';
 765  
 766          // Return to place button.
 767          if ($attemptobj->get_state() == quiz_attempt::IN_PROGRESS) {
 768              $button = new single_button(
 769                      new moodle_url($attemptobj->attempt_url(null, $attemptobj->get_currentpage())),
 770                      get_string('returnattempt', 'quiz'));
 771              $output .= $this->container($this->container($this->render($button),
 772                      'controls'), 'submitbtns mdl-align');
 773          }
 774  
 775          // Finish attempt button.
 776          $options = array(
 777              'attempt' => $attemptobj->get_attemptid(),
 778              'finishattempt' => 1,
 779              'timeup' => 0,
 780              'slots' => '',
 781              'cmid' => $attemptobj->get_cmid(),
 782              'sesskey' => sesskey(),
 783          );
 784  
 785          $button = new single_button(
 786                  new moodle_url($attemptobj->processattempt_url(), $options),
 787                  get_string('submitallandfinish', 'quiz'));
 788          $button->id = 'responseform';
 789          if ($attemptobj->get_state() == quiz_attempt::IN_PROGRESS) {
 790              $button->add_action(new confirm_action(get_string('confirmclose', 'quiz'), null,
 791                      get_string('submitallandfinish', 'quiz')));
 792          }
 793          $button->primary = true;
 794  
 795          $duedate = $attemptobj->get_due_date();
 796          $message = '';
 797          if ($attemptobj->get_state() == quiz_attempt::OVERDUE) {
 798              $message = get_string('overduemustbesubmittedby', 'quiz', userdate($duedate));
 799  
 800          } else if ($duedate) {
 801              $message = get_string('mustbesubmittedby', 'quiz', userdate($duedate));
 802          }
 803  
 804          $output .= $this->countdown_timer($attemptobj, time());
 805          $output .= $this->container($message . $this->container(
 806                  $this->render($button), 'controls'), 'submitbtns mdl-align');
 807  
 808          return $output;
 809      }
 810  
 811      /*
 812       * View Page
 813       */
 814      /**
 815       * Generates the view page
 816       *
 817       * @param stdClass $course the course settings row from the database.
 818       * @param stdClass $quiz the quiz settings row from the database.
 819       * @param stdClass $cm the course_module settings row from the database.
 820       * @param context_module $context the quiz context.
 821       * @param mod_quiz_view_object $viewobj
 822       * @return string HTML to display
 823       */
 824      public function view_page($course, $quiz, $cm, $context, $viewobj) {
 825          $output = '';
 826  
 827          $output .= $this->view_page_tertiary_nav($viewobj);
 828          $output .= $this->view_information($quiz, $cm, $context, $viewobj->infomessages);
 829          $output .= $this->view_table($quiz, $context, $viewobj);
 830          $output .= $this->view_result_info($quiz, $context, $cm, $viewobj);
 831          $output .= $this->box($this->view_page_buttons($viewobj), 'quizattempt');
 832          return $output;
 833      }
 834  
 835      /**
 836       * Render the tertiary navigation for the view page.
 837       *
 838       * @param mod_quiz_view_object $viewobj the information required to display the view page.
 839       * @return string HTML to output.
 840       */
 841      public function view_page_tertiary_nav(mod_quiz_view_object $viewobj): string {
 842          $content = '';
 843  
 844          if ($viewobj->buttontext) {
 845              $attemptbtn = $this->start_attempt_button($viewobj->buttontext,
 846                      $viewobj->startattempturl, $viewobj->preflightcheckform,
 847                      $viewobj->popuprequired, $viewobj->popupoptions);
 848              $content .= $attemptbtn;
 849          }
 850  
 851          if ($viewobj->canedit && !$viewobj->quizhasquestions) {
 852              $content .= html_writer::link($viewobj->editurl, get_string('addquestion', 'quiz'),
 853                      ['class' => 'btn btn-secondary']);
 854          }
 855  
 856          if ($content) {
 857              return html_writer::div(html_writer::div($content, 'row'), 'container-fluid tertiary-navigation');
 858          } else {
 859              return '';
 860          }
 861      }
 862  
 863      /**
 864       * Work out, and render, whatever buttons, and surrounding info, should appear
 865       * at the end of the review page.
 866       *
 867       * @param mod_quiz_view_object $viewobj the information required to display the view page.
 868       * @return string HTML to output.
 869       */
 870      public function view_page_buttons(mod_quiz_view_object $viewobj) {
 871          $output = '';
 872  
 873          if (!$viewobj->quizhasquestions) {
 874              $output .= html_writer::div(
 875                      $this->notification(get_string('noquestions', 'quiz'), 'warning', false),
 876                      'text-left mb-3');
 877          }
 878          $output .= $this->access_messages($viewobj->preventmessages);
 879  
 880          if ($viewobj->showbacktocourse) {
 881              $output .= $this->single_button($viewobj->backtocourseurl,
 882                      get_string('backtocourse', 'quiz'), 'get',
 883                      array('class' => 'continuebutton'));
 884          }
 885  
 886          return $output;
 887      }
 888  
 889      /**
 890       * Generates the view attempt button
 891       *
 892       * @param string $buttontext the label to display on the button.
 893       * @param moodle_url $url The URL to POST to in order to start the attempt.
 894       * @param mod_quiz_preflight_check_form $preflightcheckform deprecated.
 895       * @param bool $popuprequired whether the attempt needs to be opened in a pop-up.
 896       * @param array $popupoptions the options to use if we are opening a popup.
 897       * @return string HTML fragment.
 898       */
 899      public function start_attempt_button($buttontext, moodle_url $url,
 900              mod_quiz_preflight_check_form $preflightcheckform = null,
 901              $popuprequired = false, $popupoptions = null) {
 902  
 903          if (is_string($preflightcheckform)) {
 904              // Calling code was not updated since the API change.
 905              debugging('The third argument to start_attempt_button should now be the ' .
 906                      'mod_quiz_preflight_check_form from ' .
 907                      'quiz_access_manager::get_preflight_check_form, not a warning message string.');
 908          }
 909  
 910          $button = new single_button($url, $buttontext, 'post', true);
 911          $button->class .= ' quizstartbuttondiv';
 912          if ($popuprequired) {
 913              $button->class .= ' quizsecuremoderequired';
 914          }
 915  
 916          $popupjsoptions = null;
 917          if ($popuprequired && $popupoptions) {
 918              $action = new popup_action('click', $url, 'popup', $popupoptions);
 919              $popupjsoptions = $action->get_js_options();
 920          }
 921  
 922          if ($preflightcheckform) {
 923              $checkform = $preflightcheckform->render();
 924          } else {
 925              $checkform = null;
 926          }
 927  
 928          $this->page->requires->js_call_amd('mod_quiz/preflightcheck', 'init',
 929                  array('.quizstartbuttondiv [type=submit]', get_string('startattempt', 'quiz'),
 930                         '#mod_quiz_preflight_form', $popupjsoptions));
 931  
 932          return $this->render($button) . $checkform;
 933      }
 934  
 935      /**
 936       * Generate a message saying that this quiz has no questions, with a button to
 937       * go to the edit page, if the user has the right capability.
 938       *
 939       * @param bool $canedit can the current user edit the quiz?
 940       * @param moodle_url $editurl URL of the edit quiz page.
 941       * @return string HTML to output.
 942       *
 943       * @deprecated since Moodle 4.0 MDL-71915 - please do not use this function any more.
 944       */
 945      public function no_questions_message($canedit, $editurl) {
 946          debugging('no_questions_message() is deprecated, please use generate_no_questions_message() instead.', DEBUG_DEVELOPER);
 947  
 948          $output = html_writer::start_tag('div', array('class' => 'card text-center mb-3'));
 949          $output .= html_writer::start_tag('div', array('class' => 'card-body'));
 950  
 951          $output .= $this->notification(get_string('noquestions', 'quiz'), 'warning', false);
 952          if ($canedit) {
 953              $output .= $this->single_button($editurl, get_string('editquiz', 'quiz'), 'get');
 954          }
 955          $output .= html_writer::end_tag('div');
 956          $output .= html_writer::end_tag('div');
 957  
 958          return $output;
 959      }
 960  
 961      /**
 962       * Outputs an error message for any guests accessing the quiz
 963       *
 964       * @param stdClass $course the course settings row from the database.
 965       * @param stdClass $quiz the quiz settings row from the database.
 966       * @param stdClass $cm the course_module settings row from the database.
 967       * @param context_module $context the quiz context.
 968       * @param array $messages Array containing any messages
 969       * @param mod_quiz_view_object $viewobj
 970       */
 971      public function view_page_guest($course, $quiz, $cm, $context, $messages, $viewobj) {
 972          $output = '';
 973          $output .= $this->view_page_tertiary_nav($viewobj);
 974          $output .= $this->view_information($quiz, $cm, $context, $messages);
 975          $guestno = html_writer::tag('p', get_string('guestsno', 'quiz'));
 976          $liketologin = html_writer::tag('p', get_string('liketologin'));
 977          $referer = get_local_referer(false);
 978          $output .= $this->confirm($guestno."\n\n".$liketologin."\n", get_login_url(), $referer);
 979          return $output;
 980      }
 981  
 982      /**
 983       * Outputs and error message for anyone who is not enrolle don the course
 984       *
 985       * @param stdClass $course the course settings row from the database.
 986       * @param stdClass $quiz the quiz settings row from the database.
 987       * @param stdClass $cm the course_module settings row from the database.
 988       * @param context_module $context the quiz context.
 989       * @param array $messages Array containing any messages
 990       * @param mod_quiz_view_object $viewobj
 991       */
 992      public function view_page_notenrolled($course, $quiz, $cm, $context, $messages, $viewobj) {
 993          global $CFG;
 994          $output = '';
 995          $output .= $this->view_page_tertiary_nav($viewobj);
 996          $output .= $this->view_information($quiz, $cm, $context, $messages);
 997          $youneedtoenrol = html_writer::tag('p', get_string('youneedtoenrol', 'quiz'));
 998          $button = html_writer::tag('p',
 999                  $this->continue_button($CFG->wwwroot . '/course/view.php?id=' . $course->id));
1000          $output .= $this->box($youneedtoenrol."\n\n".$button."\n", 'generalbox', 'notice');
1001          return $output;
1002      }
1003  
1004      /**
1005       * Output the page information
1006       *
1007       * @param object $quiz the quiz settings.
1008       * @param object $cm the course_module object.
1009       * @param context $context the quiz context.
1010       * @param array $messages any access messages that should be described.
1011       * @param bool $quizhasquestions does quiz has questions added.
1012       * @return string HTML to output.
1013       */
1014      public function view_information($quiz, $cm, $context, $messages, bool $quizhasquestions = false) {
1015          $output = '';
1016  
1017          // Output any access messages.
1018          if ($messages) {
1019              $output .= $this->box($this->access_messages($messages), 'quizinfo');
1020          }
1021  
1022          // Show number of attempts summary to those who can view reports.
1023          if (has_capability('mod/quiz:viewreports', $context)) {
1024              if ($strattemptnum = $this->quiz_attempt_summary_link_to_reports($quiz, $cm,
1025                      $context)) {
1026                  $output .= html_writer::tag('div', $strattemptnum,
1027                          array('class' => 'quizattemptcounts'));
1028              }
1029          }
1030  
1031          if (has_any_capability(['mod/quiz:manageoverrides', 'mod/quiz:viewoverrides'], $context)) {
1032              if ($overrideinfo = $this->quiz_override_summary_links($quiz, $cm)) {
1033                  $output .= html_writer::tag('div', $overrideinfo, ['class' => 'quizattemptcounts']);
1034              }
1035          }
1036  
1037          return $output;
1038      }
1039  
1040      /**
1041       * Output the quiz intro.
1042       * @param object $quiz the quiz settings.
1043       * @param object $cm the course_module object.
1044       * @return string HTML to output.
1045       */
1046      public function quiz_intro($quiz, $cm) {
1047          if (html_is_blank($quiz->intro)) {
1048              return '';
1049          }
1050  
1051          return $this->box(format_module_intro('quiz', $quiz, $cm->id), 'generalbox', 'intro');
1052      }
1053  
1054      /**
1055       * Generates the table heading.
1056       */
1057      public function view_table_heading() {
1058          return $this->heading(get_string('summaryofattempts', 'quiz'), 3);
1059      }
1060  
1061      /**
1062       * Generates the table of data
1063       *
1064       * @param array $quiz Array contining quiz data
1065       * @param int $context The page context ID
1066       * @param mod_quiz_view_object $viewobj
1067       */
1068      public function view_table($quiz, $context, $viewobj) {
1069          if (!$viewobj->attempts) {
1070              return '';
1071          }
1072  
1073          // Prepare table header.
1074          $table = new html_table();
1075          $table->attributes['class'] = 'generaltable quizattemptsummary';
1076          $table->head = array();
1077          $table->align = array();
1078          $table->size = array();
1079          if ($viewobj->attemptcolumn) {
1080              $table->head[] = get_string('attemptnumber', 'quiz');
1081              $table->align[] = 'center';
1082              $table->size[] = '';
1083          }
1084          $table->head[] = get_string('attemptstate', 'quiz');
1085          $table->align[] = 'left';
1086          $table->size[] = '';
1087          if ($viewobj->markcolumn) {
1088              $table->head[] = get_string('marks', 'quiz') . ' / ' .
1089                      quiz_format_grade($quiz, $quiz->sumgrades);
1090              $table->align[] = 'center';
1091              $table->size[] = '';
1092          }
1093          if ($viewobj->gradecolumn) {
1094              $table->head[] = get_string('gradenoun') . ' / ' .
1095                      quiz_format_grade($quiz, $quiz->grade);
1096              $table->align[] = 'center';
1097              $table->size[] = '';
1098          }
1099          if ($viewobj->canreviewmine) {
1100              $table->head[] = get_string('review', 'quiz');
1101              $table->align[] = 'center';
1102              $table->size[] = '';
1103          }
1104          if ($viewobj->feedbackcolumn) {
1105              $table->head[] = get_string('feedback', 'quiz');
1106              $table->align[] = 'left';
1107              $table->size[] = '';
1108          }
1109  
1110          // One row for each attempt.
1111          foreach ($viewobj->attemptobjs as $attemptobj) {
1112              $attemptoptions = $attemptobj->get_display_options(true);
1113              $row = array();
1114  
1115              // Add the attempt number.
1116              if ($viewobj->attemptcolumn) {
1117                  if ($attemptobj->is_preview()) {
1118                      $row[] = get_string('preview', 'quiz');
1119                  } else {
1120                      $row[] = $attemptobj->get_attempt_number();
1121                  }
1122              }
1123  
1124              $row[] = $this->attempt_state($attemptobj);
1125  
1126              if ($viewobj->markcolumn) {
1127                  if ($attemptoptions->marks >= question_display_options::MARK_AND_MAX &&
1128                          $attemptobj->is_finished()) {
1129                      $row[] = quiz_format_grade($quiz, $attemptobj->get_sum_marks());
1130                  } else {
1131                      $row[] = '';
1132                  }
1133              }
1134  
1135              // Ouside the if because we may be showing feedback but not grades.
1136              $attemptgrade = quiz_rescale_grade($attemptobj->get_sum_marks(), $quiz, false);
1137  
1138              if ($viewobj->gradecolumn) {
1139                  if ($attemptoptions->marks >= question_display_options::MARK_AND_MAX &&
1140                          $attemptobj->is_finished()) {
1141  
1142                      // Highlight the highest grade if appropriate.
1143                      if ($viewobj->overallstats && !$attemptobj->is_preview()
1144                              && $viewobj->numattempts > 1 && !is_null($viewobj->mygrade)
1145                              && $attemptobj->get_state() == quiz_attempt::FINISHED
1146                              && $attemptgrade == $viewobj->mygrade
1147                              && $quiz->grademethod == QUIZ_GRADEHIGHEST) {
1148                          $table->rowclasses[$attemptobj->get_attempt_number()] = 'bestrow';
1149                      }
1150  
1151                      $row[] = quiz_format_grade($quiz, $attemptgrade);
1152                  } else {
1153                      $row[] = '';
1154                  }
1155              }
1156  
1157              if ($viewobj->canreviewmine) {
1158                  $row[] = $viewobj->accessmanager->make_review_link($attemptobj->get_attempt(),
1159                          $attemptoptions, $this);
1160              }
1161  
1162              if ($viewobj->feedbackcolumn && $attemptobj->is_finished()) {
1163                  if ($attemptoptions->overallfeedback) {
1164                      $row[] = quiz_feedback_for_grade($attemptgrade, $quiz, $context);
1165                  } else {
1166                      $row[] = '';
1167                  }
1168              }
1169  
1170              if ($attemptobj->is_preview()) {
1171                  $table->data['preview'] = $row;
1172              } else {
1173                  $table->data[$attemptobj->get_attempt_number()] = $row;
1174              }
1175          } // End of loop over attempts.
1176  
1177          $output = '';
1178          $output .= $this->view_table_heading();
1179          $output .= html_writer::table($table);
1180          return $output;
1181      }
1182  
1183      /**
1184       * Generate a brief textual desciption of the current state of an attempt.
1185       * @param quiz_attempt $attemptobj the attempt
1186       * @param int $timenow the time to use as 'now'.
1187       * @return string the appropriate lang string to describe the state.
1188       */
1189      public function attempt_state($attemptobj) {
1190          switch ($attemptobj->get_state()) {
1191              case quiz_attempt::IN_PROGRESS:
1192                  return get_string('stateinprogress', 'quiz');
1193  
1194              case quiz_attempt::OVERDUE:
1195                  return get_string('stateoverdue', 'quiz') . html_writer::tag('span',
1196                          get_string('stateoverduedetails', 'quiz',
1197                                  userdate($attemptobj->get_due_date())),
1198                          array('class' => 'statedetails'));
1199  
1200              case quiz_attempt::FINISHED:
1201                  return get_string('statefinished', 'quiz') . html_writer::tag('span',
1202                          get_string('statefinisheddetails', 'quiz',
1203                                  userdate($attemptobj->get_submitted_date())),
1204                          array('class' => 'statedetails'));
1205  
1206              case quiz_attempt::ABANDONED:
1207                  return get_string('stateabandoned', 'quiz');
1208          }
1209      }
1210  
1211      /**
1212       * Generates data pertaining to quiz results
1213       *
1214       * @param array $quiz Array containing quiz data
1215       * @param int $context The page context ID
1216       * @param int $cm The Course Module Id
1217       * @param mod_quiz_view_object $viewobj
1218       */
1219      public function view_result_info($quiz, $context, $cm, $viewobj) {
1220          $output = '';
1221          if (!$viewobj->numattempts && !$viewobj->gradecolumn && is_null($viewobj->mygrade)) {
1222              return $output;
1223          }
1224          $resultinfo = '';
1225  
1226          if ($viewobj->overallstats) {
1227              if ($viewobj->moreattempts) {
1228                  $a = new stdClass();
1229                  $a->method = quiz_get_grading_option_name($quiz->grademethod);
1230                  $a->mygrade = quiz_format_grade($quiz, $viewobj->mygrade);
1231                  $a->quizgrade = quiz_format_grade($quiz, $quiz->grade);
1232                  $resultinfo .= $this->heading(get_string('gradesofar', 'quiz', $a), 3);
1233              } else {
1234                  $a = new stdClass();
1235                  $a->grade = quiz_format_grade($quiz, $viewobj->mygrade);
1236                  $a->maxgrade = quiz_format_grade($quiz, $quiz->grade);
1237                  $a = get_string('outofshort', 'quiz', $a);
1238                  $resultinfo .= $this->heading(get_string('yourfinalgradeis', 'quiz', $a), 3);
1239              }
1240          }
1241  
1242          if ($viewobj->mygradeoverridden) {
1243  
1244              $resultinfo .= html_writer::tag('p', get_string('overriddennotice', 'grades'),
1245                      array('class' => 'overriddennotice'))."\n";
1246          }
1247          if ($viewobj->gradebookfeedback) {
1248              $resultinfo .= $this->heading(get_string('comment', 'quiz'), 3);
1249              $resultinfo .= html_writer::div($viewobj->gradebookfeedback, 'quizteacherfeedback') . "\n";
1250          }
1251          if ($viewobj->feedbackcolumn) {
1252              $resultinfo .= $this->heading(get_string('overallfeedback', 'quiz'), 3);
1253              $resultinfo .= html_writer::div(
1254                      quiz_feedback_for_grade($viewobj->mygrade, $quiz, $context),
1255                      'quizgradefeedback') . "\n";
1256          }
1257  
1258          if ($resultinfo) {
1259              $output .= $this->box($resultinfo, 'generalbox', 'feedback');
1260          }
1261          return $output;
1262      }
1263  
1264      /**
1265       * Output either a link to the review page for an attempt, or a button to
1266       * open the review in a popup window.
1267       *
1268       * @param moodle_url $url of the target page.
1269       * @param bool $reviewinpopup whether a pop-up is required.
1270       * @param array $popupoptions options to pass to the popup_action constructor.
1271       * @return string HTML to output.
1272       */
1273      public function review_link($url, $reviewinpopup, $popupoptions) {
1274          if ($reviewinpopup) {
1275              $button = new single_button($url, get_string('review', 'quiz'));
1276              $button->add_action(new popup_action('click', $url, 'quizpopup', $popupoptions));
1277              return $this->render($button);
1278  
1279          } else {
1280              return html_writer::link($url, get_string('review', 'quiz'),
1281                      array('title' => get_string('reviewthisattempt', 'quiz')));
1282          }
1283      }
1284  
1285      /**
1286       * Displayed where there might normally be a review link, to explain why the
1287       * review is not available at this time.
1288       * @param string $message optional message explaining why the review is not possible.
1289       * @return string HTML to output.
1290       */
1291      public function no_review_message($message) {
1292          return html_writer::nonempty_tag('span', $message,
1293                  array('class' => 'noreviewmessage'));
1294      }
1295  
1296      /**
1297       * Returns the same as {@link quiz_num_attempt_summary()} but wrapped in a link
1298       * to the quiz reports.
1299       *
1300       * @param stdClass $quiz the quiz object. Only $quiz->id is used at the moment.
1301       * @param stdClass $cm the cm object. Only $cm->course, $cm->groupmode and $cm->groupingid
1302       * fields are used at the moment.
1303       * @param context $context the quiz context.
1304       * @param bool $returnzero if false (default), when no attempts have been made '' is returned
1305       *      instead of 'Attempts: 0'.
1306       * @param int $currentgroup if there is a concept of current group where this method is being
1307       *      called (e.g. a report) pass it in here. Default 0 which means no current group.
1308       * @return string HTML fragment for the link.
1309       */
1310      public function quiz_attempt_summary_link_to_reports($quiz, $cm, $context,
1311                                                            $returnzero = false, $currentgroup = 0) {
1312          global $CFG;
1313          $summary = quiz_num_attempt_summary($quiz, $cm, $returnzero, $currentgroup);
1314          if (!$summary) {
1315              return '';
1316          }
1317  
1318          require_once($CFG->dirroot . '/mod/quiz/report/reportlib.php');
1319          $url = new moodle_url('/mod/quiz/report.php', array(
1320                  'id' => $cm->id, 'mode' => quiz_report_default_report($context)));
1321          return html_writer::link($url, $summary);
1322      }
1323  
1324      /**
1325       * Render a summary of the number of group and user overrides, with corresponding links.
1326       *
1327       * @param stdClass $quiz the quiz settings.
1328       * @param stdClass|cm_info $cm the cm object.
1329       * @param int $currentgroup currently selected group, if there is one.
1330       * @return string HTML fragment for the link.
1331       */
1332      public function quiz_override_summary_links(stdClass $quiz, stdClass $cm, $currentgroup = 0): string {
1333  
1334          $baseurl = new moodle_url('/mod/quiz/overrides.php', ['cmid' => $cm->id]);
1335          $counts = quiz_override_summary($quiz, $cm, $currentgroup);
1336  
1337          $links = [];
1338          if ($counts['group']) {
1339              $links[] = html_writer::link(new moodle_url($baseurl, ['mode' => 'group']),
1340                      get_string('overridessummarygroup', 'quiz', $counts['group']));
1341          }
1342          if ($counts['user']) {
1343              $links[] = html_writer::link(new moodle_url($baseurl, ['mode' => 'user']),
1344                      get_string('overridessummaryuser', 'quiz', $counts['user']));
1345          }
1346  
1347          if (!$links) {
1348              return '';
1349          }
1350  
1351          $links = implode(', ', $links);
1352          switch ($counts['mode']) {
1353              case 'onegroup':
1354                  return get_string('overridessummarythisgroup', 'quiz', $links);
1355  
1356              case 'somegroups':
1357                  return get_string('overridessummaryyourgroups', 'quiz', $links);
1358  
1359              case 'allgroups':
1360                  return get_string('overridessummary', 'quiz', $links);
1361  
1362              default:
1363                  throw new coding_exception('Unexpected mode ' . $counts['mode']);
1364          }
1365      }
1366  
1367      /**
1368       * Outputs a chart.
1369       *
1370       * @param \core\chart_base $chart The chart.
1371       * @param string $title The title to display above the graph.
1372       * @param array $attrs extra container html attributes.
1373       * @return string HTML fragment for the graph.
1374       */
1375      public function chart(\core\chart_base $chart, $title, $attrs = []) {
1376          return $this->heading($title, 3) . html_writer::tag('div',
1377              $this->render($chart), array_merge(['class' => 'graph'], $attrs));
1378      }
1379  
1380      /**
1381       * Output a graph, or a message saying that GD is required.
1382       * @param moodle_url $url the URL of the graph.
1383       * @param string $title the title to display above the graph.
1384       * @return string HTML fragment for the graph.
1385       */
1386      public function graph(moodle_url $url, $title) {
1387          global $CFG;
1388  
1389          $graph = html_writer::empty_tag('img', array('src' => $url, 'alt' => $title));
1390  
1391          return $this->heading($title, 3) . html_writer::tag('div', $graph, array('class' => 'graph'));
1392      }
1393  
1394      /**
1395       * Output the connection warning messages, which are initially hidden, and
1396       * only revealed by JavaScript if necessary.
1397       */
1398      public function connection_warning() {
1399          $options = array('filter' => false, 'newlines' => false);
1400          $warning = format_text(get_string('connectionerror', 'quiz'), FORMAT_MARKDOWN, $options);
1401          $ok = format_text(get_string('connectionok', 'quiz'), FORMAT_MARKDOWN, $options);
1402          return html_writer::tag('div', $warning,
1403                      array('id' => 'connection-error', 'style' => 'display: none;', 'role' => 'alert')) .
1404                      html_writer::tag('div', $ok, array('id' => 'connection-ok', 'style' => 'display: none;', 'role' => 'alert'));
1405      }
1406  }
1407  
1408  
1409  class mod_quiz_links_to_other_attempts implements renderable {
1410      /**
1411       * @var array string attempt number => url, or null for the current attempt.
1412       * url may be either a moodle_url, or a renderable.
1413       */
1414      public $links = array();
1415  }
1416  
1417  
1418  class mod_quiz_view_object {
1419      /** @var array $infomessages of messages with information to display about the quiz. */
1420      public $infomessages;
1421      /** @var array $attempts contains all the user's attempts at this quiz. */
1422      public $attempts;
1423      /** @var array $attemptobjs quiz_attempt objects corresponding to $attempts. */
1424      public $attemptobjs;
1425      /** @var quiz_access_manager $accessmanager contains various access rules. */
1426      public $accessmanager;
1427      /** @var bool $canreviewmine whether the current user has the capability to
1428       *       review their own attempts. */
1429      public $canreviewmine;
1430      /** @var bool $canedit whether the current user has the capability to edit the quiz. */
1431      public $canedit;
1432      /** @var moodle_url $editurl the URL for editing this quiz. */
1433      public $editurl;
1434      /** @var int $attemptcolumn contains the number of attempts done. */
1435      public $attemptcolumn;
1436      /** @var int $gradecolumn contains the grades of any attempts. */
1437      public $gradecolumn;
1438      /** @var int $markcolumn contains the marks of any attempt. */
1439      public $markcolumn;
1440      /** @var int $overallstats contains all marks for any attempt. */
1441      public $overallstats;
1442      /** @var string $feedbackcolumn contains any feedback for and attempt. */
1443      public $feedbackcolumn;
1444      /** @var string $timenow contains a timestamp in string format. */
1445      public $timenow;
1446      /** @var int $numattempts contains the total number of attempts. */
1447      public $numattempts;
1448      /** @var float $mygrade contains the user's final grade for a quiz. */
1449      public $mygrade;
1450      /** @var bool $moreattempts whether this user is allowed more attempts. */
1451      public $moreattempts;
1452      /** @var int $mygradeoverridden contains an overriden grade. */
1453      public $mygradeoverridden;
1454      /** @var string $gradebookfeedback contains any feedback for a gradebook. */
1455      public $gradebookfeedback;
1456      /** @var bool $unfinished contains 1 if an attempt is unfinished. */
1457      public $unfinished;
1458      /** @var object $lastfinishedattempt the last attempt from the attempts array. */
1459      public $lastfinishedattempt;
1460      /** @var array $preventmessages of messages telling the user why they can't
1461       *       attempt the quiz now. */
1462      public $preventmessages;
1463      /** @var string $buttontext caption for the start attempt button. If this is null, show no
1464       *      button, or if it is '' show a back to the course button. */
1465      public $buttontext;
1466      /** @var moodle_url $startattempturl URL to start an attempt. */
1467      public $startattempturl;
1468      /** @var mod_quiz_preflight_check_form|null $preflightcheckform confirmation form that must be
1469       *       submitted before an attempt is started, if required. */
1470      public $preflightcheckform;
1471      /** @var moodle_url $startattempturl URL for any Back to the course button. */
1472      public $backtocourseurl;
1473      /** @var bool $showbacktocourse should we show a back to the course button? */
1474      public $showbacktocourse;
1475      /** @var bool whether the attempt must take place in a popup window. */
1476      public $popuprequired;
1477      /** @var array options to use for the popup window, if required. */
1478      public $popupoptions;
1479      /** @var bool $quizhasquestions whether the quiz has any questions. */
1480      public $quizhasquestions;
1481  
1482      public function __get($field) {
1483          switch ($field) {
1484              case 'startattemptwarning':
1485                  debugging('startattemptwarning has been deprecated. It is now always blank.');
1486                  return '';
1487  
1488              default:
1489                  debugging('Unknown property ' . $field);
1490                  return null;
1491          }
1492      }
1493  }