ThemeSettings.php

<?php

namespace Drupal\Core\Theme;

use Drupal\Core\Config\ConfigBase;

/**
 * Provides a configuration API wrapper for runtime merged theme settings.
 *
 * Theme settings use configuration for base values but the runtime theme
 * settings are calculated based on various site settings and are therefore
 * not persisted.
 *
 * @see theme_get_setting()
 */
class ThemeSettings extends ConfigBase {
    
    /**
     * The theme of the theme settings object.
     *
     * @var string
     */
    protected $theme;
    
    /**
     * Constructs a theme settings object.
     *
     * @param string $theme
     *   The name of the theme settings object being constructed.
     */
    public function __construct($theme) {
        $this->theme = $theme;
    }
    
    /**
     * Returns the theme of this theme settings object.
     *
     * @return string
     *   The theme of this theme settings object.
     */
    public function getTheme() {
        return $this->theme;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheTags() {
        return [
            'rendered',
        ];
    }

}