question/type/truefalse/question.php

   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 }