[Summary view] [Print] [Text view]

   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 classify_response(array $response) {
  63          if (!array_key_exists('answer', $response)) {
  64              return array($this->id => question_classified_response::no_response());
  65          }
  66          list($fraction) = $this->grade_response($response);
  67          if ($response['answer']) {
  68              return array($this->id => new question_classified_response(1,
  69                      get_string('true', 'qtype_truefalse'), $fraction));
  70          } else {
  71              return array($this->id => new question_classified_response(0,
  72                      get_string('false', 'qtype_truefalse'), $fraction));
  73          }
  74      }
  75  
  76      public function is_complete_response(array $response) {
  77          return array_key_exists('answer', $response);
  78      }
  79  
  80      public function get_validation_error(array $response) {
  81          if ($this->is_gradable_response($response)) {
  82              return '';
  83          }
  84          return get_string('pleaseselectananswer', 'qtype_truefalse');
  85      }
  86  
  87      public function is_same_response(array $prevresponse, array $newresponse) {
  88          return question_utils::arrays_same_at_key_missing_is_blank(
  89                  $prevresponse, $newresponse, 'answer');
  90      }
  91  
  92      public function grade_response(array $response) {
  93          if ($this->rightanswer == true && $response['answer'] == true) {
  94              $fraction = 1;
  95          } else if ($this->rightanswer == false && $response['answer'] == false) {
  96              $fraction = 1;
  97          } else {
  98              $fraction = 0;
  99          }
 100          return array($fraction, question_state::graded_state_for_fraction($fraction));
 101      }
 102  
 103      public function check_file_access($qa, $options, $component, $filearea, $args, $forcedownload) {
 104          if ($component == 'question' && $filearea == 'answerfeedback') {
 105              $answerid = reset($args); // Itemid is answer id.
 106              $response = $qa->get_last_qt_var('answer', '');
 107              return $options->feedback && (
 108                      ($answerid == $this->trueanswerid && $response) ||
 109                      ($answerid == $this->falseanswerid && $response !== ''));
 110  
 111          } else {
 112              return parent::check_file_access($qa, $options, $component, $filearea,
 113                      $args, $forcedownload);
 114          }
 115      }
 116  }