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✏️ Editing: language_menu.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/>.

/**
 * Contains class \core\output\language_menu
 *
 * @package    core
 * @category   output
 * @copyright  2021 Adrian Greeve <adrian@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace core\output;

/**
 * Class for creating the language menu
 *
 * @package    core
 * @category   output
 * @copyright  2021 Adrian Greeve <adrian@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class language_menu implements \renderable, \templatable {

/** @var \moodle_page $page the moodle page that the languague menu belongs to */
    protected $page;

/** @var string current language code */
    protected $currentlang;

/** @var array localised list of installed translations */
    protected $langs;

/**
     * Language menu constructor.
     *
     * @param \moodle_page $page the moodle page that the languague menu belongs to.
     */
    public function __construct($page) {
        $this->page = $page;
        $this->currentlang = \current_language();
        $this->langs = \get_string_manager()->get_list_of_translations();
    }

/**
     * Determine if the language menu should be shown.
     *
     * @return bool true if the language menu should be shown.
     */
    protected function show_language_menu(): bool {
        global $CFG;

if (empty($CFG->langmenu)) {
            return false;
        }

if ($this->page->course != SITEID and !empty($this->page->course->lang)) {
            // Do not show lang menu if language forced.
            return false;
        }

if (count($this->langs) < 2) {
            return false;
        }
        return true;
    }

/**
     * Export the data.
     *
     * @param \renderer_base $output
     * @return array with the title for the menu and an array of items.
     */
    public function export_for_template(\renderer_base $output): array {
        // Early return if a lang menu does not exists.
        if (!$this->show_language_menu()) {
            return [];
        }

$nodes = [];
        $activelanguage = '';

// Add the lang picker if needed.
        foreach ($this->langs as $langtype => $langname) {
            $isactive = $langtype == $this->currentlang;
            $attributes = [];
            if (!$isactive) {
                // Set the lang attribute for languages different from the page's current language.
                $attributes[] = [
                    'key' => 'lang',
                    'value' => get_html_lang_attribute_value($langtype),
                ];
            }
            $node = [
                'title' => $langname,
                'text' => $langname,
                'link' => true,
                'isactive' => $isactive,
                'url' => $isactive ? new \moodle_url('#') : new \moodle_url($this->page->url, ['lang' => $langtype]),
            ];
            if (!empty($attributes)) {
                $node['attributes'] = $attributes;
            }

$nodes[] = $node;

if ($isactive) {
                $activelanguage = $langname;
            }
        }

return [
            'title' => $activelanguage,
            'items' => $nodes,
        ];
    }

/**
     * Export the data providing a structure for the core/action_menu template.
     *
     * @param \renderer_base $output
     * @return \stdClass action_menu data export.
     */
    public function export_for_action_menu(\renderer_base $output): ?\stdClass {
        $languagedata = $this->export_for_template($output);
        if (empty($languagedata)) {
            return null;
        }
        $langmenu = new \action_menu();
        $menuname = \get_string('language');
        if (!empty($languagedata['title'])) {
            $menuname = $languagedata['title'];
        }
        $langmenu->set_menu_trigger($menuname);
        foreach ($languagedata['items'] as $node) {
            $langparam = $node['url']->get_param('lang');
            $attributes = [];
            if ($langparam) {
                $attributes = [
                    'data-lang' => $langparam,
                    'lang' => get_html_lang_attribute_value($langparam),
                ];
            }
            $lang = new \action_menu_link_secondary($node['url'], null, $node['title'], $attributes);
            $langmenu->add($lang);
        }
        return $langmenu->export_for_template($output);
    }

/**
     * Export the data providing a structure for the core/single_select template.
     *
     * @param \renderer_base $output
     * @return \stdClass single_select data export.
     */
    public function export_for_single_select(\renderer_base $output): ?\stdClass {
        if (!$this->show_language_menu()) {
            return null;
        }
        $singleselect = new \single_select($this->page->url, 'lang', $this->langs, $this->currentlang, null);
        $singleselect->label = get_accesshide(\get_string('language'));
        $singleselect->class = 'langmenu';
        return $singleselect->export_for_template($output);
    }

}

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