[Summary view]

Differences Between: [Versions 310 and 403] [Versions 311 and 403] [Versions 39 and 403] [Versions 400 and 403] [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      /** @var int the format of the true feedback. */
  45      public $truefeedbackformat;
  46  
  47      /** @var int the format of the false feedback. */
  48      public $falsefeedbackformat;
  49  
  50      /** @var bool true to show the standard instruction, otherwise hide it. */
  51      public $showstandardinstruction;
  52  
  53      public function get_expected_data() {
  54          return array('answer' => PARAM_INT);
  55      }
  56  
  57      public function get_correct_response() {
  58          return array('answer' => (int) $this->rightanswer);
  59      }
  60  
  61      public function summarise_response(array $response) {
  62          if (!array_key_exists('answer', $response)) {
  63              return null;
  64          } else if ($response['answer']) {
  65              return get_string('true', 'qtype_truefalse');
  66          } else {
  67              return get_string('false', 'qtype_truefalse');
  68          }
  69      }
  70  
  71      public function un_summarise_response(string $summary) {
  72          if ($summary === get_string('true', 'qtype_truefalse')) {
  73              return ['answer' => '1'];
  74          } else if ($summary === get_string('false', 'qtype_truefalse')) {
  75              return ['answer' => '0'];
  76          } else {
  77              return [];
  78          }
  79      }
  80  
  81      public function classify_response(array $response) {
  82          if (!array_key_exists('answer', $response)) {
  83              return array($this->id => question_classified_response::no_response());
  84          }
  85          list($fraction) = $this->grade_response($response);
  86          if ($response['answer']) {
  87              return array($this->id => new question_classified_response(1,
  88                      get_string('true', 'qtype_truefalse'), $fraction));
  89          } else {
  90              return array($this->id => new question_classified_response(0,
  91                      get_string('false', 'qtype_truefalse'), $fraction));
  92          }
  93      }
  94  
  95      public function is_complete_response(array $response) {
  96          return array_key_exists('answer', $response);
  97      }
  98  
  99      public function get_validation_error(array $response) {
 100          if ($this->is_gradable_response($response)) {
 101              return '';
 102          }
 103          return get_string('pleaseselectananswer', 'qtype_truefalse');
 104      }
 105  
 106      public function is_same_response(array $prevresponse, array $newresponse) {
 107          return question_utils::arrays_same_at_key_missing_is_blank(
 108                  $prevresponse, $newresponse, 'answer');
 109      }
 110  
 111      public function grade_response(array $response) {
 112          if ($this->rightanswer == true && $response['answer'] == true) {
 113              $fraction = 1;
 114          } else if ($this->rightanswer == false && $response['answer'] == false) {
 115              $fraction = 1;
 116          } else {
 117              $fraction = 0;
 118          }
 119          return array($fraction, question_state::graded_state_for_fraction($fraction));
 120      }
 121  
 122      public function check_file_access($qa, $options, $component, $filearea, $args, $forcedownload) {
 123          if ($component == 'question' && $filearea == 'answerfeedback') {
 124              $answerid = reset($args); // Itemid is answer id.
 125              $response = $qa->get_last_qt_var('answer', '');
 126              return $options->feedback && (
 127                      ($answerid == $this->trueanswerid && $response) ||
 128                      ($answerid == $this->falseanswerid && $response !== ''));
 129  
 130          } else {
 131              return parent::check_file_access($qa, $options, $component, $filearea,
 132                      $args, $forcedownload);
 133          }
 134      }
 135  
 136      /**
 137       * Return the question settings that define this question as structured data.
 138       *
 139       * @param question_attempt $qa the current attempt for which we are exporting the settings.
 140       * @param question_display_options $options the question display options which say which aspects of the question
 141       * should be visible.
 142       * @return mixed structure representing the question settings. In web services, this will be JSON-encoded.
 143       */
 144      public function get_question_definition_for_external_rendering(question_attempt $qa, question_display_options $options) {
 145          // No need to return anything, external clients do not need additional information for rendering this question type.
 146          return null;
 147      }
 148  }