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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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namespace core\output;
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/**
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* This class houses methods for checking theme usage in a given context.
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*
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* @package core
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* @category output
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* @copyright 2024 David Woloszyn <david.woloszyn@moodle.com>
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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 theme_usage {
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/** @var string The theme usage type for users. */
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public const THEME_USAGE_TYPE_USER = 'user';
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/** @var string The theme usage type for courses. */
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public const THEME_USAGE_TYPE_COURSE = 'course';
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/** @var string The theme usage type for cohorts. */
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public const THEME_USAGE_TYPE_COHORT = 'cohort';
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/** @var string The theme usage type for categories. */
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public const THEME_USAGE_TYPE_CATEGORY = 'category';
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/** @var string The theme usage type for all. */
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public const THEME_USAGE_TYPE_ALL = 'all';
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/** @var int The theme is used in context. */
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public const THEME_IS_USED = 1;
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/** @var int The theme is not used in context. */
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public const THEME_IS_NOT_USED = 0;
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/**
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* Check if the theme is used in any context (e.g. user, course, cohort, category).
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*
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* This query is cached.
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*
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* @param string $themename The theme to check.
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* @return int Return 1 if at least one record was found, 0 if none.
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*/
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public static function is_theme_used_in_any_context(string $themename): int {
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global $DB;
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$cache = \cache::make('core', 'theme_usedincontext');
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$isused = $cache->get($themename);
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if ($isused === false) {
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$sqlunions = [];
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// For each context, check if the config is enabled and there is at least one use.
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if (get_config('core', 'allowuserthemes')) {
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$sqlunions[self::THEME_USAGE_TYPE_USER] = "
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SELECT u.id
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FROM {user} u
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WHERE u.theme = :usertheme
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";
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}
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if (get_config('core', 'allowcoursethemes')) {
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$sqlunions[self::THEME_USAGE_TYPE_COURSE] = "
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SELECT c.id
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FROM {course} c
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WHERE c.theme = :coursetheme
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";
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}
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if (get_config('core', 'allowcohortthemes')) {
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$sqlunions[self::THEME_USAGE_TYPE_COHORT] = "
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SELECT co.id
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FROM {cohort} co
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WHERE co.theme = :cohorttheme
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";
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}
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if (get_config('core', 'allowcategorythemes')) {
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$sqlunions[self::THEME_USAGE_TYPE_CATEGORY] = "
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SELECT cat.id
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FROM {course_categories} cat
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WHERE cat.theme = :categorytheme
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";
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}
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// Union the sql statements from the different tables.
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if (!empty($sqlunions)) {
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$sql = implode(' UNION ', $sqlunions);
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// Prepare params.
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$params = [];
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foreach ($sqlunions as $type => $val) {
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$params[$type . 'theme'] = $themename;
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}
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$result = $DB->record_exists_sql($sql, $params);
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}
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if (!empty($result)) {
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$isused = self::THEME_IS_USED;
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} else {
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$isused = self::THEME_IS_NOT_USED;
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}
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// Cache the result so we don't have to keep checking for this theme.
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$cache->set($themename, $isused);
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return $isused;
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} else {
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return $isused;
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}
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}
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}
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