edit_form.php

<?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/>.

/**
 * Version information
 *
 * @package   block_typorepo
 * @copyright 2020 bdecent gmbh <https://bdecent.de>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

use mod_typorepo\typo3;

defined('MOODLE_INTERNAL') || die;

/**
 * Block instance form.
 */
class block_typorepo_edit_form extends block_edit_form {

    /**
     * Defines block form elements.
     *
     * @param object $mform the form being built.
     * @throws coding_exception
     * @throws dml_exception
     */
    protected function specific_definition($mform) {

        $typo3url = typo3::build_url(optional_param('course', '', PARAM_INT), optional_param('update', '', PARAM_INT));

        $iframe = \html_writer::tag('iframe', '', [
            'src' => $typo3url,
            'frameborder' => 0,
            'scrolling' => get_config('typorepo', 'scrolling'),
            'width' => get_config('typorepo', 'width'),
            'height' => get_config('typorepo', 'height'),
            'class' => 'typo-embed'
        ]);
        $mform->addElement('html', $iframe);

        // Fields for editing HTML block title and contents.
        $mform->addElement('header', 'configheader', get_string('blocksettings', 'block'));

        $mform->addElement('text', 'config_title', get_string('configtitle', 'block_typorepo'));
        $mform->setType('config_title', PARAM_TEXT);

        $mform->addElement('text', 'config_url', get_string('url', 'block_typorepo'));
        $mform->setType('config_url', PARAM_URL);
        $mform->addRule('config_url', get_string('required'), 'required');

        $mform->addElement('text', 'config_height', get_string('height', 'block_typorepo'));
        $mform->setType('config_height', PARAM_INT);
        $mform->setDefault('config_height', 150);
    }
}