SystemController::themesPage

public SystemController::themesPage()

public function themesPage() {
  $config = $this->config('system.theme');
  // Get all available themes.
  $themes = $this->themeHandler->rebuildThemeData();
  uasort($themes, 'system_sort_modules_by_info_name');

  $theme_default = $config->get('default');
  $theme_groups = array('installed' => array(), 'uninstalled' => array());
  $admin_theme = $config->get('admin');
  $admin_theme_options = array();

  foreach ($themes as &$theme) {
    if (!empty($theme->info['hidden'])) {
      continue;
    }
    $theme->is_default = ($theme->getName() == $theme_default);
    $theme->is_admin = ($theme->getName() == $admin_theme || ($theme->is_default && $admin_theme == '0'));

    // Identify theme screenshot.
    $theme->screenshot = NULL;
    // Create a list which includes the current theme and all its base themes.
    if (isset($themes[$theme->getName()]->base_themes)) {
      $theme_keys = array_keys($themes[$theme->getName()]->base_themes);
      $theme_keys[] = $theme->getName();
    }
    else {
      $theme_keys = array($theme->getName());
    }
    // Look for a screenshot in the current theme or in its closest ancestor.
    foreach (array_reverse($theme_keys) as $theme_key) {
      if (isset($themes[$theme_key]) && file_exists($themes[$theme_key]->info['screenshot'])) {
        $theme->screenshot = array(
          'uri' => $themes[$theme_key]->info['screenshot'],
          'alt' => $this->t('Screenshot for @theme theme', array('@theme' => $theme->info['name'])),
          'title' => $this->t('Screenshot for @theme theme', array('@theme' => $theme->info['name'])),
          'attributes' => array('class' => array('screenshot')),
        );
        break;
      }
    }

    if (empty($theme->status)) {
      // Ensure this theme is compatible with this version of core.
      $theme->incompatible_core = !isset($theme->info['core']) || ($theme->info['core'] != \DRUPAL::CORE_COMPATIBILITY);
      // Require the 'content' region to make sure the main page
      // content has a common place in all themes.
      $theme->incompatible_region = !isset($theme->info['regions']['content']);
      $theme->incompatible_php = version_compare(phpversion(), $theme->info['php']) < 0;
      // Confirm that all base themes are available.
      $theme->incompatible_base = (isset($theme->info['base theme']) && !($theme->base_themes === array_filter($theme->base_themes)));
      // Confirm that the theme engine is available.
      $theme->incompatible_engine = isset($theme->info['engine']) && !isset($theme->owner);
    }
    $theme->operations = array();
    if (!empty($theme->status) || !$theme->incompatible_core && !$theme->incompatible_php && !$theme->incompatible_base && !$theme->incompatible_engine) {
      // Create the operations links.
      $query['theme'] = $theme->getName();
      if ($this->themeAccess->checkAccess($theme->getName())) {
        $theme->operations[] = array(
          'title' => $this->t('Settings'),
          'url' => Url::fromRoute('system.theme_settings_theme', ['theme' => $theme->getName()]),
          'attributes' => array('title' => $this->t('Settings for @theme theme', array('@theme' => $theme->info['name']))),
        );
      }
      if (!empty($theme->status)) {
        if (!$theme->is_default) {
          $theme_uninstallable = TRUE;
          if ($theme->getName() == $admin_theme) {
            $theme_uninstallable = FALSE;
          }
          // Check it isn't the base of theme of an installed theme.
          foreach ($theme->required_by as $themename => $dependency) {
            if (!empty($themes[$themename]->status)) {
              $theme_uninstallable = FALSE;
            }
          }
          if ($theme_uninstallable) {
            $theme->operations[] = array(
              'title' => $this->t('Uninstall'),
              'url' => Url::fromRoute('system.theme_uninstall'),
              'query' => $query,
              'attributes' => array('title' => $this->t('Uninstall @theme theme', array('@theme' => $theme->info['name']))),
            );
          }
          $theme->operations[] = array(
            'title' => $this->t('Set as default'),
            'url' => Url::fromRoute('system.theme_set_default'),
            'query' => $query,
            'attributes' => array('title' => $this->t('Set @theme as default theme', array('@theme' => $theme->info['name']))),
          );
        }
        $admin_theme_options[$theme->getName()] = $theme->info['name'];
      }
      else {
        $theme->operations[] = array(
          'title' => $this->t('Install'),
          'url' => Url::fromRoute('system.theme_install'),
          'query' => $query,
          'attributes' => array('title' => $this->t('Install @theme theme', array('@theme' => $theme->info['name']))),
        );
        $theme->operations[] = array(
          'title' => $this->t('Install and set as default'),
          'url' => Url::fromRoute('system.theme_set_default'),
          'query' => $query,
          'attributes' => array('title' => $this->t('Install @theme as default theme', array('@theme' => $theme->info['name']))),
        );
      }
    }

    // Add notes to default and administration theme.
    $theme->notes = array();
    if ($theme->is_default) {
      $theme->notes[] = $this->t('default theme');
    }
    if ($theme->is_admin) {
      $theme->notes[] = $this->t('administration theme');
    }

    // Sort installed and uninstalled themes into their own groups.
    $theme_groups[$theme->status ? 'installed' : 'uninstalled'][] = $theme;
  }

  // There are two possible theme groups.
  $theme_group_titles = array(
    'installed' => $this->formatPlural(count($theme_groups['installed']), 'Installed theme', 'Installed themes'),
  );
  if (!empty($theme_groups['uninstalled'])) {
    $theme_group_titles['uninstalled'] = $this->formatPlural(count($theme_groups['uninstalled']), 'Uninstalled theme', 'Uninstalled themes');
  }

  uasort($theme_groups['installed'], 'system_sort_themes');
  $this->moduleHandler()->alter('system_themes_page', $theme_groups);

  $build = array();
  $build[] = array(
    '#theme' => 'system_themes_page',
    '#theme_groups' => $theme_groups,
    '#theme_group_titles' => $theme_group_titles,
  );
  $build[] = $this->formBuilder->getForm('Drupal\system\Form\ThemeAdminForm', $admin_theme_options);

  return $build;
}