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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* True-false question definition class.
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*
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* @package qtype
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* @subpackage truefalse
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* @copyright 2009 The Open University
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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require_once($CFG->dirroot . '/question/type/questionbase.php');
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/**
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* Represents a true-false question.
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*
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* @copyright 2009 The Open University
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class qtype_truefalse_question extends question_graded_automatically {
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public $rightanswer;
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public $truefeedback;
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public $falsefeedback;
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public $trueanswerid;
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public $falseanswerid;
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/** @var int the format of the true feedback. */
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public $truefeedbackformat;
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/** @var int the format of the false feedback. */
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public $falsefeedbackformat;
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/** @var bool true to show the standard instruction, otherwise hide it. */
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public $showstandardinstruction;
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public function get_expected_data() {
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return array('answer' => PARAM_INT);
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}
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public function get_correct_response() {
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return array('answer' => (int) $this->rightanswer);
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}
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public function summarise_response(array $response) {
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if (!array_key_exists('answer', $response)) {
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return null;
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} else if ($response['answer']) {
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return get_string('true', 'qtype_truefalse');
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} else {
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return get_string('false', 'qtype_truefalse');
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}
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}
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public function un_summarise_response(string $summary) {
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if ($summary === get_string('true', 'qtype_truefalse')) {
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return ['answer' => '1'];
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} else if ($summary === get_string('false', 'qtype_truefalse')) {
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return ['answer' => '0'];
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} else {
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return [];
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}
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}
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public function classify_response(array $response) {
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if (!array_key_exists('answer', $response)) {
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return array($this->id => question_classified_response::no_response());
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}
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list($fraction) = $this->grade_response($response);
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if ($response['answer']) {
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return array($this->id => new question_classified_response(1,
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get_string('true', 'qtype_truefalse'), $fraction));
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} else {
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return array($this->id => new question_classified_response(0,
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get_string('false', 'qtype_truefalse'), $fraction));
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}
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}
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public function is_complete_response(array $response) {
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return array_key_exists('answer', $response);
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}
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public function get_validation_error(array $response) {
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if ($this->is_gradable_response($response)) {
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return '';
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}
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return get_string('pleaseselectananswer', 'qtype_truefalse');
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}
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public function is_same_response(array $prevresponse, array $newresponse) {
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return question_utils::arrays_same_at_key_missing_is_blank(
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$prevresponse, $newresponse, 'answer');
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}
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public function grade_response(array $response) {
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if ($this->rightanswer == true && $response['answer'] == true) {
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$fraction = 1;
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} else if ($this->rightanswer == false && $response['answer'] == false) {
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$fraction = 1;
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} else {
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$fraction = 0;
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}
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return array($fraction, question_state::graded_state_for_fraction($fraction));
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}
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public function check_file_access($qa, $options, $component, $filearea, $args, $forcedownload) {
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if ($component == 'question' && $filearea == 'answerfeedback') {
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$answerid = reset($args); // Itemid is answer id.
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$response = $qa->get_last_qt_var('answer', '');
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return $options->feedback && (
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($answerid == $this->trueanswerid && $response) ||
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($answerid == $this->falseanswerid && $response !== ''));
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} else {
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return parent::check_file_access($qa, $options, $component, $filearea,
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$args, $forcedownload);
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}
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}
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/**
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* Return the question settings that define this question as structured data.
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*
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* @param question_attempt $qa the current attempt for which we are exporting the settings.
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* @param question_display_options $options the question display options which say which aspects of the question
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* should be visible.
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* @return mixed structure representing the question settings. In web services, this will be JSON-encoded.
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*/
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public function get_question_definition_for_external_rendering(question_attempt $qa, question_display_options $options) {
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// No need to return anything, external clients do not need additional information for rendering this question type.
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return null;
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}
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}
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