C:/xampp/htdocs/moodle/question/behaviour/interactive/renderer.php

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<?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/>.

defined('MOODLE_INTERNAL') || die();


class qbehaviour_interactive_renderer extends qbehaviour_renderer {
    public function controls(question_attempt $qa, question_display_options $options) {
        return $this->submit_button($qa, $options);
    }

    public function feedback(question_attempt $qa, question_display_options $options) {
        if (!$qa->get_state()->is_active() || !$options->readonly) {
            return '';
        }

        $attributes = array(
            'type' => 'submit',
            'id' => $qa->get_behaviour_field_name('tryagain'),
            'name' => $qa->get_behaviour_field_name('tryagain'),
            'value' => get_string('tryagain', 'qbehaviour_interactive'),
            'class' => 'submit btn',
        );
        if ($options->readonly !== qbehaviour_interactive::READONLY_EXCEPT_TRY_AGAIN) {
            $attributes['disabled'] = 'disabled';
        }
        $output = html_writer::empty_tag('input', $attributes);
        if (empty($attributes['disabled'])) {
            $this->page->requires->js_init_call('M.core_question_engine.init_submit_button',
                    array($attributes['id'], $qa->get_slot()));
        }
        return $output;
    }
}