[Summary view]

Differences Between: [Versions 39 and 401] [Versions 401 and 402] [Versions 401 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   * True-false question definition class.
  19   *
  20   * @package    qtype
  21   * @subpackage truefalse
  22   * @copyright  2009 The Open University
  23   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24   */
  25  
  26  
  27  defined('MOODLE_INTERNAL') || die();
  28  
  29  require_once($CFG->dirroot . '/question/type/questionbase.php');
  30  
  31  /**
  32   * Represents a true-false question.
  33   *
  34   * @copyright  2009 The Open University
  35   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  36   */
  37  class qtype_truefalse_question extends question_graded_automatically {
  38      public $rightanswer;
  39      public $truefeedback;
  40      public $falsefeedback;
  41      public $trueanswerid;
  42      public $falseanswerid;
  43  
  44      public function get_expected_data() {
  45          return array('answer' => PARAM_INT);
  46      }
  47  
  48      public function get_correct_response() {
  49          return array('answer' => (int) $this->rightanswer);
  50      }
  51  
  52      public function summarise_response(array $response) {
  53          if (!array_key_exists('answer', $response)) {
  54              return null;
  55          } else if ($response['answer']) {
  56              return get_string('true', 'qtype_truefalse');
  57          } else {
  58              return get_string('false', 'qtype_truefalse');
  59          }
  60      }
  61  
  62      public function un_summarise_response(string $summary) {
  63          if ($summary === get_string('true', 'qtype_truefalse')) {
  64              return ['answer' => '1'];
  65          } else if ($summary === get_string('false', 'qtype_truefalse')) {
  66              return ['answer' => '0'];
  67          } else {
  68              return [];
  69          }
  70      }
  71  
  72      public function classify_response(array $response) {
  73          if (!array_key_exists('answer', $response)) {
  74              return array($this->id => question_classified_response::no_response());
  75          }
  76          list($fraction) = $this->grade_response($response);
  77          if ($response['answer']) {
  78              return array($this->id => new question_classified_response(1,
  79                      get_string('true', 'qtype_truefalse'), $fraction));
  80          } else {
  81              return array($this->id => new question_classified_response(0,
  82                      get_string('false', 'qtype_truefalse'), $fraction));
  83          }
  84      }
  85  
  86      public function is_complete_response(array $response) {
  87          return array_key_exists('answer', $response);
  88      }
  89  
  90      public function get_validation_error(array $response) {
  91          if ($this->is_gradable_response($response)) {
  92              return '';
  93          }
  94          return get_string('pleaseselectananswer', 'qtype_truefalse');
  95      }
  96  
  97      public function is_same_response(array $prevresponse, array $newresponse) {
  98          return question_utils::arrays_same_at_key_missing_is_blank(
  99                  $prevresponse, $newresponse, 'answer');
 100      }
 101  
 102      public function grade_response(array $response) {
 103          if ($this->rightanswer == true && $response['answer'] == true) {
 104              $fraction = 1;
 105          } else if ($this->rightanswer == false && $response['answer'] == false) {
 106              $fraction = 1;
 107          } else {
 108              $fraction = 0;
 109          }
 110          return array($fraction, question_state::graded_state_for_fraction($fraction));
 111      }
 112  
 113      public function check_file_access($qa, $options, $component, $filearea, $args, $forcedownload) {
 114          if ($component == 'question' && $filearea == 'answerfeedback') {
 115              $answerid = reset($args); // Itemid is answer id.
 116              $response = $qa->get_last_qt_var('answer', '');
 117              return $options->feedback && (
 118                      ($answerid == $this->trueanswerid && $response) ||
 119                      ($answerid == $this->falseanswerid && $response !== ''));
 120  
 121          } else {
 122              return parent::check_file_access($qa, $options, $component, $filearea,
 123                      $args, $forcedownload);
 124          }
 125      }
 126  
 127      /**
 128       * Return the question settings that define this question as structured data.
 129       *
 130       * @param question_attempt $qa the current attempt for which we are exporting the settings.
 131       * @param question_display_options $options the question display options which say which aspects of the question
 132       * should be visible.
 133       * @return mixed structure representing the question settings. In web services, this will be JSON-encoded.
 134       */
 135      public function get_question_definition_for_external_rendering(question_attempt $qa, question_display_options $options) {
 136          // No need to return anything, external clients do not need additional information for rendering this question type.
 137          return null;
 138      }
 139  }