By alexpott on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
8.7.x
Introduced in version: 
8.7.0
Issue links: 
https://www.drupal.org/node/3020157
Description: 

Drupal\Core\Theme\ActiveTheme::getBaseThemes() is deprecated. You can no longer directly get the ActiveTheme representations of the current ActiveTheme's base themes from it.

Before

$active_theme = \Drupal::theme()->getActiveTheme();
foreach ($active_theme->getBaseThemes() as $base_theme) {
  $engine = $base_theme->getEngine();
}

After

$active_theme = \Drupal::theme()->getActiveTheme();
foreach ($active_theme->getBaseThemeExtensions() as $base_theme) {
  $base_active_theme = \Drupal::service('theme.initialization')->getActiveThemeByName($base_theme->getName());
  $engine = $base_theme->getEngine();
}

Note that the active theme representation is rarely (if ever needed) and the new method \Drupal\Core\Theme\ActiveTheme::getBaseThemeExtensions() returns \Drupal\Core\Extension\Extension objects for each base theme.

Impacts: 
Module developers