acquia_vwo-1.0.x-dev/modules/acquia_vwo_content/src/Service/ThemeManager.php

<?php

namespace Drupal\acquia_vwo_content\Service;

use Drupal\Core\Config\ConfigFactoryInterface;
use Drupal\Core\Theme\ActiveTheme;
use Drupal\Core\Theme\ThemeInitializationInterface;
use Drupal\Core\Theme\ThemeManagerInterface;

/**
 * Class ThemeManager.
 *
 * Handles theme switching logic.
 */
class ThemeManager {

  /**
   * The theme initialization.
   *
   * @var \Drupal\Core\Theme\ThemeInitializationInterface
   */
  protected $themeInitialization;

  /**
   * The theme manager.
   *
   * @var \Drupal\Core\Theme\ThemeManagerInterface
   */
  protected $themeManager;

  /**
   * The config factory service.
   *
   * @var \Drupal\Core\Config\ConfigFactoryInterface
   */
  protected $configFactory;

  /**
   * Constructor.
   */
  public function __construct(
    ThemeInitializationInterface $theme_initialization,
    ThemeManagerInterface $theme_manager,
    ConfigFactoryInterface $config_factory,
  ) {
    $this->themeInitialization = $theme_initialization;
    $this->themeManager = $theme_manager;
    $this->configFactory = $config_factory;
  }

  /**
   * Get Default Theme.
   *
   * @return \Drupal\Core\Theme\ActiveTheme
   *   The default theme.
   *
   * @throws \Drupal\Core\Theme\MissingThemeDependencyException
   *   If the default theme is not found.
   */
  public function getDefaultTheme(): ActiveTheme {
    $activeDefaultThemeName = $this->configFactory->get('system.theme')->get('default');
    return $this->themeInitialization->getActiveThemeByName($activeDefaultThemeName);
  }

  /**
   * Get Active Theme.
   *
   * @return \Drupal\Core\Theme\ActiveTheme
   *   The active theme.
   */
  public function getActiveTheme(): ActiveTheme {
    return $this->themeManager->getActiveTheme();
  }

  /**
   * Set Active Theme.
   *
   * @param \Drupal\Core\Theme\ActiveTheme $theme
   *   The theme to set as active.
   *
   * @return void
   *   No return value.
   */
  public function switchTheme(ActiveTheme $theme): void {
    $this->themeInitialization->loadActiveTheme($theme);
    $this->themeManager->setActiveTheme($theme);
  }

}