Proyectos de Subversion Moodle

<?php

// This file is part of Moodle - http://moodle.org/

//

// Moodle is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// Moodle is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**

 * Multianswer question renderer classes.

 * Handle shortanswer, numerical and various multichoice subquestions

 *

 * @package    qtype

 * @subpackage multianswer

 * @copyright  2010 Pierre Pichet

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

require_once($CFG->dirroot . '/question/type/shortanswer/renderer.php');

/**

 * Base class for generating the bits of output common to multianswer

 * (Cloze) questions.

 * This render the main question text and transfer to the subquestions

 * the task of display their input elements and status

 * feedback, grade, correct answer(s)

 *

 * @copyright 2010 Pierre Pichet

 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class qtype_multianswer_renderer extends qtype_renderer {

    public function formulation_and_controls(question_attempt $qa,

            question_display_options $options) {

        $question = $qa->get_question();

        $output = '';

        $subquestions = array();

        $missingsubquestions = false;

        foreach ($question->textfragments as $i => $fragment) {

            if ($i > 0) {

                $index = $question->places[$i];

                $questionisvalid = !empty($question->subquestions[$index]) &&

                                 $question->subquestions[$index]->qtype->name() !== 'subquestion_replacement';

                if (!$questionisvalid) {

                    $missingsubquestions = true;

                    $questionreplacement = qtype_multianswer::deleted_subquestion_replacement();

                    // It is possible that the subquestion index does not exist. When corrupted quizzes (see MDL-54724) are

                    // restored, the sequence column of mdl_quiz_multianswer can be empty, in this case

                    // qtype_multianswer::get_question_options cannot fill in deleted questions, so we need to do it here.

                    $question->subquestions[$index] = $question->subquestions[$index] ?? $questionreplacement;

                }

                $token = 'qtypemultianswer' . $i . 'marker';

                $token = '<span class="nolink">' . $token . '</span>';

                $output .= $token;

                $subquestions[$token] = $this->subquestion($qa, $options, $index,

                        $question->subquestions[$index]);

            }

            $output .= $fragment;

        }

        if ($missingsubquestions) {

            $output = $this->notification(get_string('corruptedquestion', 'qtype_multianswer'), 'error') . $output;

        }

        $output = $question->format_text($output, $question->questiontextformat,

                $qa, 'question', 'questiontext', $question->id);

        $output = str_replace(array_keys($subquestions), array_values($subquestions), $output);

        if ($qa->get_state() == question_state::$invalid) {

            $output .= html_writer::nonempty_tag('div',

                    $question->get_validation_error($qa->get_last_qt_data()),

                    array('class' => 'validationerror'));

        }

        return $output;

    }

    public function subquestion(question_attempt $qa,

            question_display_options $options, $index, question_automatically_gradable $subq) {

        $subtype = $subq->qtype->name();

        if ($subtype == 'numerical' || $subtype == 'shortanswer') {

            $subrenderer = 'textfield';

        } else if ($subtype == 'multichoice') {

            if ($subq instanceof qtype_multichoice_multi_question) {

                if ($subq->layout == qtype_multichoice_base::LAYOUT_VERTICAL) {

                    $subrenderer = 'multiresponse_vertical';

                } else {

                    $subrenderer = 'multiresponse_horizontal';

                }

            } else {

                if ($subq->layout == qtype_multichoice_base::LAYOUT_DROPDOWN) {

                    $subrenderer = 'multichoice_inline';

                } else if ($subq->layout == qtype_multichoice_base::LAYOUT_HORIZONTAL) {

                    $subrenderer = 'multichoice_horizontal';

                } else {

                    $subrenderer = 'multichoice_vertical';

                }

            }

        } else if ($subtype == 'subquestion_replacement') {

            return html_writer::div(

                get_string('missingsubquestion', 'qtype_multianswer'),

                'notifyproblem'

            );

        } else {

            throw new coding_exception('Unexpected subquestion type.', $subq);

        }

        /** @var qtype_multianswer_subq_renderer_base $renderer */

        $renderer = $this->page->get_renderer('qtype_multianswer', $subrenderer);

        return $renderer->subquestion($qa, $options, $index, $subq);

    }

    public function correct_response(question_attempt $qa) {

        return '';

    }

}

/**

 * Subclass for generating the bits of output specific to shortanswer

 * subquestions.

 *

 * @copyright 2011 The Open University

 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

abstract class qtype_multianswer_subq_renderer_base extends qtype_renderer {

    /** @var int[] Stores the counts of answer instances for questions. */

    protected static $answercount = [];

    /** @var question_display_options Question display options instance for any necessary information for rendering the question. */

    protected $displayoptions;

    abstract public function subquestion(question_attempt $qa,

            question_display_options $options, $index,

            question_graded_automatically $subq);

    /**

     * Render the feedback pop-up contents.

     *

     * @param question_graded_automatically $subq the subquestion.

     * @param float $fraction the mark the student got. null if this subq was not answered.

     * @param string $feedbacktext the feedback text, already processed with format_text etc.

     * @param string $rightanswer the right answer, already processed with format_text etc.

     * @param question_display_options $options the display options.

     * @return string the HTML for the feedback popup.

     */

    protected function feedback_popup(question_graded_automatically $subq,

            $fraction, $feedbacktext, $rightanswer, question_display_options $options) {

        $feedback = array();

        if ($options->correctness) {

            if (is_null($fraction)) {

                $state = question_state::$gaveup;

            } else {

                $state = question_state::graded_state_for_fraction($fraction);

            }

            $feedback[] = $state->default_string(true);

        }

        if ($options->feedback && $feedbacktext) {

            $feedback[] = $feedbacktext;

        }

        if ($options->rightanswer) {

            $feedback[] = get_string('correctansweris', 'qtype_shortanswer', $rightanswer);

        }

        $subfraction = '';

        if ($options->marks >= question_display_options::MARK_AND_MAX && $subq->defaultmark > 0

                && (!is_null($fraction) || $feedback)) {

            $a = new stdClass();

            $a->mark = format_float($fraction * $subq->defaultmark, $options->markdp);

            $a->max = format_float($subq->defaultmark, $options->markdp);

            $feedback[] = get_string('markoutofmax', 'question', $a);

        }

        if (!$feedback) {

            return '';

        }

        return html_writer::tag('span', implode('<br />', $feedback), [

            'class' => 'feedbackspan',

        ]);

    }

    /**

     * Render the feedback icon for a sub-question which is also the trigger for the feedback popover.

     *

     * @param string $icon The feedback icon

     * @param string $feedbackcontents The feedback contents to be shown on the popover.

     * @return string

     */

    protected function get_feedback_image(string $icon, string $feedbackcontents): string {

        global $PAGE;

        if ($icon === '') {

            return '';

        }

        $PAGE->requires->js_call_amd('qtype_multianswer/feedback', 'initPopovers');

        return html_writer::link('#', $icon, [

            'role' => 'button',

            'tabindex' => 0,

            'class' => 'feedbacktrigger btn btn-link p-0',

            'data-toggle' => 'popover',

            'data-container' => 'body',

            'data-content' => $feedbackcontents,

            'data-placement' => 'right',

            'data-trigger' => 'hover focus',

            'data-html' => 'true',

        ]);

    }

    /**

     * Generates a label for an answer field.

     *

     * If the question number is set ({@see qtype_renderer::$questionnumber}), the label will

     * include the question number in order to indicate which question the answer field belongs to.

     *

     * @param string $langkey The lang string key for the lang string that does not include the question number.

     * @param string $component The Frankenstyle component name.

     * @return string

     * @throws coding_exception

     */

    protected function get_answer_label(

        string $langkey = 'answerx',

        string $component = 'question'

    ): string {

        // There may be multiple answer fields for a question, so we need to increment the answer fields in order to distinguish

        // them from one another.

        $questionnumber = $this->displayoptions->questionidentifier ?? '';

        $questionnumberindex = $questionnumber !== '' ? $questionnumber : 0;

        if (isset(self::$answercount[$questionnumberindex][$langkey])) {

            self::$answercount[$questionnumberindex][$langkey]++;

        } else {

            self::$answercount[$questionnumberindex][$langkey] = 1;

        }

        $params = self::$answercount[$questionnumberindex][$langkey];

        return $this->displayoptions->add_question_identifier_to_label(get_string($langkey, $component, $params));

    }

}

/**

 * Subclass for generating the bits of output specific to shortanswer

 * subquestions.

 *

 * @copyright 2011 The Open University

 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class qtype_multianswer_textfield_renderer extends qtype_multianswer_subq_renderer_base {

    public function subquestion(question_attempt $qa, question_display_options $options,

            $index, question_graded_automatically $subq) {

        $this->displayoptions = $options;

        $fieldprefix = 'sub' . $index . '_';

        $fieldname = $fieldprefix . 'answer';

        $response = $qa->get_last_qt_var($fieldname);

        if ($subq->qtype->name() == 'shortanswer') {

            $matchinganswer = $subq->get_matching_answer(array('answer' => $response));

        } else if ($subq->qtype->name() == 'numerical') {

            list($value, $unit, $multiplier) = $subq->ap->apply_units($response, '');

            $matchinganswer = $subq->get_matching_answer($value, 1);

        } else {

            $matchinganswer = $subq->get_matching_answer($response);

        }

        if (!$matchinganswer) {

            if (is_null($response) || $response === '') {

                $matchinganswer = new question_answer(0, '', null, '', FORMAT_HTML);

            } else {

                $matchinganswer = new question_answer(0, '', 0.0, '', FORMAT_HTML);

            }

        }

        // Work out a good input field size.

        $size = max(1, core_text::strlen(trim($response ?? '')) + 1);

        foreach ($subq->answers as $ans) {

            $size = max($size, core_text::strlen(trim($ans->answer)));

        }

        $size = min(60, round($size + rand(0, (int)($size * 0.15))));

        // The rand bit is to make guessing harder.

        $inputattributes = array(

            'type' => 'text',

            'name' => $qa->get_qt_field_name($fieldname),

            'value' => $response,

            'id' => $qa->get_qt_field_name($fieldname),

            'size' => $size,

            'class' => 'form-control d-inline mb-1',

        );

        if ($options->readonly) {

            $inputattributes['readonly'] = 'readonly';

        }

        $feedbackimg = '';

        if ($options->correctness) {

            $inputattributes['class'] .= ' ' . $this->feedback_class($matchinganswer->fraction);

            $feedbackimg = $this->feedback_image($matchinganswer->fraction);

        }

        if ($subq->qtype->name() == 'shortanswer') {

            $correctanswer = $subq->get_matching_answer($subq->get_correct_response());

        } else {

            $correctanswer = $subq->get_correct_answer();

        }

        $feedbackpopup = $this->feedback_popup($subq, $matchinganswer->fraction,

                $subq->format_text($matchinganswer->feedback, $matchinganswer->feedbackformat,

                        $qa, 'question', 'answerfeedback', $matchinganswer->id),

                s($correctanswer->answer), $options);

        $output = html_writer::start_tag('span', ['class' => 'subquestion']);

        $output .= html_writer::tag('label', $this->get_answer_label(),

                array('class' => 'subq accesshide', 'for' => $inputattributes['id']));

        $output .= html_writer::empty_tag('input', $inputattributes);

        $output .= $this->get_feedback_image($feedbackimg, $feedbackpopup);

        $output .= html_writer::end_tag('span');

        return $output;

    }

}

/**

 * Render an embedded multiple-choice question that is displayed as a select menu.

 *

 * @copyright  2011 The Open University

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class qtype_multianswer_multichoice_inline_renderer

        extends qtype_multianswer_subq_renderer_base {

    public function subquestion(question_attempt $qa, question_display_options $options,

            $index, question_graded_automatically $subq) {

        $this->displayoptions = $options;

        $fieldprefix = 'sub' . $index . '_';

        $fieldname = $fieldprefix . 'answer';

        $response = $qa->get_last_qt_var($fieldname);

        $choices = array();

        $matchinganswer = new question_answer(0, '', null, '', FORMAT_HTML);

        $rightanswer = null;

        foreach ($subq->get_order($qa) as $value => $ansid) {

            $ans = $subq->answers[$ansid];

            $choices[$value] = $subq->format_text($ans->answer, $ans->answerformat,

                    $qa, 'question', 'answer', $ansid);

            if ($subq->is_choice_selected($response, $value)) {

                $matchinganswer = $ans;

            }

        }

        $inputattributes = array(

            'id' => $qa->get_qt_field_name($fieldname),

        );

        if ($options->readonly) {

            $inputattributes['disabled'] = 'disabled';

        }

        $feedbackimg = '';

        if ($options->correctness) {

            $inputattributes['class'] = $this->feedback_class($matchinganswer->fraction);

            $feedbackimg = $this->feedback_image($matchinganswer->fraction);

        }

        $select = html_writer::select($choices, $qa->get_qt_field_name($fieldname),

                $response, array('' => ' '), $inputattributes);

        $order = $subq->get_order($qa);

        $correctresponses = $subq->get_correct_response();

        $rightanswer = $subq->answers[$order[reset($correctresponses)]];

        if (!$matchinganswer) {

            $matchinganswer = new question_answer(0, '', null, '', FORMAT_HTML);

        }

        $feedbackpopup = $this->feedback_popup($subq, $matchinganswer->fraction,

                $subq->format_text($matchinganswer->feedback, $matchinganswer->feedbackformat,

                        $qa, 'question', 'answerfeedback', $matchinganswer->id),

                $subq->format_text($rightanswer->answer, $rightanswer->answerformat,

                        $qa, 'question', 'answer', $rightanswer->id), $options);

        $output = html_writer::start_tag('span', array('class' => 'subquestion'));

        $output .= html_writer::tag('label', $this->get_answer_label(),

                array('class' => 'subq accesshide', 'for' => $inputattributes['id']));

        $output .= $select;

        $output .= $this->get_feedback_image($feedbackimg, $feedbackpopup);

        $output .= html_writer::end_tag('span');

        return $output;

    }

}

/**

 * Render an embedded multiple-choice question vertically, like for a normal

 * multiple-choice question.

 *

 * @copyright  2010 Pierre Pichet

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class qtype_multianswer_multichoice_vertical_renderer extends qtype_multianswer_subq_renderer_base {

    public function subquestion(question_attempt $qa, question_display_options $options,

            $index, question_graded_automatically $subq) {

        $this->displayoptions = $options;

        $fieldprefix = 'sub' . $index . '_';

        $fieldname = $fieldprefix . 'answer';

        $response = $qa->get_last_qt_var($fieldname);

        $inputattributes = array(

            'type' => 'radio',

            'name' => $qa->get_qt_field_name($fieldname),

            'class' => 'form-check-input',

        );

        if ($options->readonly) {

            $inputattributes['disabled'] = 'disabled';

        }

        $result = $this->all_choices_wrapper_start();

        $fraction = null;

        foreach ($subq->get_order($qa) as $value => $ansid) {

            $ans = $subq->answers[$ansid];

            $inputattributes['value'] = $value;

            $inputattributes['id'] = $inputattributes['name'] . $value;

            $isselected = $subq->is_choice_selected($response, $value);

            if ($isselected) {

                $inputattributes['checked'] = 'checked';

                $fraction = $ans->fraction;

            } else {

                unset($inputattributes['checked']);

            }

            $class = 'form-check text-wrap text-break';

            if ($options->correctness && $isselected) {

                $feedbackimg = $this->feedback_image($ans->fraction);

                $class .= ' ' . $this->feedback_class($ans->fraction);

            } else {

                $feedbackimg = '';

            }

            $result .= $this->choice_wrapper_start($class);

            $result .= html_writer::empty_tag('input', $inputattributes);

            $result .= html_writer::tag('label', $subq->format_text($ans->answer,

                    $ans->answerformat, $qa, 'question', 'answer', $ansid),

                    array('for' => $inputattributes['id'], 'class' => 'form-check-label text-body'));

            $result .= $feedbackimg;

            if ($options->feedback && $isselected && trim($ans->feedback)) {

                $result .= html_writer::tag('div',

                        $subq->format_text($ans->feedback, $ans->feedbackformat,

                                $qa, 'question', 'answerfeedback', $ansid),

                        array('class' => 'specificfeedback'));

            }

            $result .= $this->choice_wrapper_end();

        }

        $result .= $this->all_choices_wrapper_end();

        $feedback = array();

        if ($options->feedback && $options->marks >= question_display_options::MARK_AND_MAX &&

                $subq->defaultmark > 0) {

            $a = new stdClass();

            $a->mark = format_float($fraction * $subq->defaultmark, $options->markdp);

            $a->max = format_float($subq->defaultmark, $options->markdp);

            $feedback[] = html_writer::tag('div', get_string('markoutofmax', 'question', $a));

        }

        if ($options->rightanswer) {

            foreach ($subq->answers as $ans) {

                if (question_state::graded_state_for_fraction($ans->fraction) ==

                        question_state::$gradedright) {

                    $feedback[] = get_string('correctansweris', 'qtype_multichoice',

                            $subq->format_text($ans->answer, $ans->answerformat,

                                    $qa, 'question', 'answer', $ansid));

                    break;

                }

            }

        }

        $result .= html_writer::nonempty_tag('div', implode('<br />', $feedback), array('class' => 'outcome'));

        return $result;

    }

    /**

     * @param string $class class attribute value.

     * @return string HTML to go before each choice.

     */

    protected function choice_wrapper_start($class) {

        return html_writer::start_tag('div', array('class' => $class));

    }

    /**

     * @return string HTML to go after each choice.

     */

    protected function choice_wrapper_end() {

        return html_writer::end_tag('div');

    }

    /**

     * @return string HTML to go before all the choices.

     */

    protected function all_choices_wrapper_start() {

        $wrapperstart = html_writer::start_tag('fieldset', array('class' => 'answer'));

        $legendtext = $this->get_answer_label('multichoicex', 'qtype_multianswer');

        $wrapperstart .= html_writer::tag('legend', $legendtext, ['class' => 'sr-only']);

        return $wrapperstart;

    }

    /**

     * @return string HTML to go after all the choices.

     */

    protected function all_choices_wrapper_end() {

        return html_writer::end_tag('fieldset');

    }

}

/**

 * Render an embedded multiple-choice question vertically, like for a normal

 * multiple-choice question.

 *

 * @copyright  2010 Pierre Pichet

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class qtype_multianswer_multichoice_horizontal_renderer

        extends qtype_multianswer_multichoice_vertical_renderer {

    protected function choice_wrapper_start($class) {

        return html_writer::start_tag('div', array('class' => $class . ' form-check-inline'));

    }

    protected function choice_wrapper_end() {

        return html_writer::end_tag('div');

    }

    protected function all_choices_wrapper_start() {

        $wrapperstart = html_writer::start_tag('fieldset', ['class' => 'answer']);

        $captiontext = $this->get_answer_label('multichoicex', 'qtype_multianswer');

        $wrapperstart .= html_writer::tag('legend', $captiontext, ['class' => 'sr-only']);

        return $wrapperstart;

    }

    protected function all_choices_wrapper_end() {

        return html_writer::end_tag('fieldset');

    }

}

/**

 * Class qtype_multianswer_multiresponse_renderer

 *

 * @copyright  2016 Davo Smith, Synergy Learning

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class qtype_multianswer_multiresponse_vertical_renderer extends qtype_multianswer_subq_renderer_base {

    /**

     * Output the content of the subquestion.

     *

     * @param question_attempt $qa

     * @param question_display_options $options

     * @param int $index

     * @param question_graded_automatically $subq

     * @return string

     */

    public function subquestion(question_attempt $qa, question_display_options $options,

                                $index, question_graded_automatically $subq) {

        if (!$subq instanceof qtype_multichoice_multi_question) {

            throw new coding_exception('Expecting subquestion of type qtype_multichoice_multi_question');

        }

        $fieldprefix = 'sub' . $index . '_';

        $fieldname = $fieldprefix . 'choice';

        // Extract the responses that related to this question + strip off the prefix.

        $fieldprefixlen = strlen($fieldprefix);

        $response = [];

        foreach ($qa->get_last_qt_data() as $name => $val) {

            if (substr($name, 0, $fieldprefixlen) == $fieldprefix) {

                $name = substr($name, $fieldprefixlen);

                $response[$name] = $val;

            }

        }

        $basename = $qa->get_qt_field_name($fieldname);

        $inputattributes = array(

            'type' => 'checkbox',

            'value' => 1,

        );

        if ($options->readonly) {

            $inputattributes['disabled'] = 'disabled';

        }

        $result = $this->all_choices_wrapper_start();

        // Calculate the total score (as we need to know if choices should be marked as 'correct' or 'partial').

        $fraction = 0;

        foreach ($subq->get_order($qa) as $value => $ansid) {

            $ans = $subq->answers[$ansid];

            if ($subq->is_choice_selected($response, $value)) {

                $fraction += $ans->fraction;

            }

        }

        // Display 'correct' answers as correct, if we are at 100%, otherwise mark them as 'partial'.

        $answerfraction = ($fraction > 0.999) ? 1.0 : 0.5;

        foreach ($subq->get_order($qa) as $value => $ansid) {

            $ans = $subq->answers[$ansid];

            $name = $basename.$value;

            $inputattributes['name'] = $name;

            $inputattributes['id'] = $name;

            $isselected = $subq->is_choice_selected($response, $value);

            if ($isselected) {

                $inputattributes['checked'] = 'checked';

            } else {

                unset($inputattributes['checked']);

            }

            $class = 'r' . ($value % 2);

            if ($options->correctness && $isselected) {

                $thisfrac = ($ans->fraction > 0) ? $answerfraction : 0;

                $feedbackimg = $this->feedback_image($thisfrac);

                $class .= ' ' . $this->feedback_class($thisfrac);

            } else {

                $feedbackimg = '';

            }

            $result .= $this->choice_wrapper_start($class);

            $result .= html_writer::empty_tag('input', $inputattributes);

            $result .= html_writer::tag('label', $subq->format_text($ans->answer,

                                                                    $ans->answerformat, $qa, 'question', 'answer', $ansid),

                                        array('for' => $inputattributes['id']));

            $result .= $feedbackimg;

            if ($options->feedback && $isselected && trim($ans->feedback)) {

                $result .= html_writer::tag('div',

                                            $subq->format_text($ans->feedback, $ans->feedbackformat,

                                                               $qa, 'question', 'answerfeedback', $ansid),

                                            array('class' => 'specificfeedback'));

            }

            $result .= $this->choice_wrapper_end();

        }

        $result .= $this->all_choices_wrapper_end();

        $feedback = array();

        if ($options->feedback && $options->marks >= question_display_options::MARK_AND_MAX &&

            $subq->defaultmark > 0) {

            $a = new stdClass();

            $a->mark = format_float($fraction * $subq->defaultmark, $options->markdp);

            $a->max = format_float($subq->defaultmark, $options->markdp);

            $feedback[] = html_writer::tag('div', get_string('markoutofmax', 'question', $a));

        }

        if ($options->rightanswer) {

            $correct = [];

            foreach ($subq->answers as $ans) {

                if (question_state::graded_state_for_fraction($ans->fraction) != question_state::$gradedwrong) {

                    $correct[] = $subq->format_text($ans->answer, $ans->answerformat, $qa, 'question', 'answer', $ans->id);

                }

            }

            $correct = '<ul><li>'.implode('</li><li>', $correct).'</li></ul>';

            $feedback[] = get_string('correctansweris', 'qtype_multichoice', $correct);

        }

        $result .= html_writer::nonempty_tag('div', implode('<br />', $feedback), array('class' => 'outcome'));

        return $result;

    }

    /**

     * @param string $class class attribute value.

     * @return string HTML to go before each choice.

     */

    protected function choice_wrapper_start($class) {

        return html_writer::start_tag('div', array('class' => $class));

    }

    /**

     * @return string HTML to go after each choice.

     */

    protected function choice_wrapper_end() {

        return html_writer::end_tag('div');

    }

    /**

     * @return string HTML to go before all the choices.

     */

    protected function all_choices_wrapper_start() {

        return html_writer::start_tag('div', array('class' => 'answer'));

    }

    /**

     * @return string HTML to go after all the choices.

     */

    protected function all_choices_wrapper_end() {

        return html_writer::end_tag('div');

    }

}

/**

 * Render an embedded multiple-response question horizontally.

 *

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class qtype_multianswer_multiresponse_horizontal_renderer

    extends qtype_multianswer_multiresponse_vertical_renderer {

    protected function choice_wrapper_start($class) {

        return html_writer::start_tag('td', array('class' => $class));

    }

    protected function choice_wrapper_end() {

        return html_writer::end_tag('td');

    }

    protected function all_choices_wrapper_start() {

        return html_writer::start_tag('table', array('class' => 'answer')) .

        html_writer::start_tag('tbody') . html_writer::start_tag('tr');

    }

    protected function all_choices_wrapper_end() {

        return html_writer::end_tag('tr') . html_writer::end_tag('tbody') .

        html_writer::end_tag('table');

    }

}