ThemeUninstallConfirmForm.php

<?php

declare (strict_types=1);
namespace Drupal\system\Form;

use Drupal\Core\Config\ConfigManagerInterface;
use Drupal\Core\Config\Entity\ConfigDependencyDeleteFormTrait;
use Drupal\Core\DependencyInjection\AutowireTrait;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\Extension\ThemeHandlerInterface;
use Drupal\Core\Extension\ThemeInstallerInterface;
use Drupal\Core\Form\ConfirmFormBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Url;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
use Symfony\Component\HttpKernel\Attribute\MapQueryParameter;

/**
 * Builds a confirmation form to uninstall a theme.
 *
 * @internal
 */
class ThemeUninstallConfirmForm extends ConfirmFormBase {
  use AutowireTrait;
  use ConfigDependencyDeleteFormTrait;
  
  /**
   * The theme label.
   */
  protected string $themeLabel = '';
  public function __construct(protected ThemeHandlerInterface $themeHandler, protected ThemeInstallerInterface $themeInstaller, protected ConfigManagerInterface $configManager, protected EntityTypeManagerInterface $entityTypeManager) {
  }
  
  /**
   * {@inheritdoc}
   */
  public function getQuestion() : TranslatableMarkup {
    if ($this->themeLabel) {
      return $this->t('Uninstall %theme theme', [
        '%theme' => $this->themeLabel,
      ]);
    }
    return $this->t('Uninstall theme');
  }
  
  /**
   * {@inheritdoc}
   */
  public function getConfirmText() : TranslatableMarkup {
    return $this->t('Uninstall');
  }
  
  /**
   * {@inheritdoc}
   */
  public function getCancelUrl() : Url {
    return new Url('system.themes_page');
  }
  
  /**
   * {@inheritdoc}
   */
  public function getDescription() : TranslatableMarkup {
    return $this->t('Would you like to continue with uninstalling the above?');
  }
  
  /**
   * {@inheritdoc}
   */
  public function getFormId() : string {
    return 'system_theme_uninstall_confirm_form';
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state, #[MapQueryParameter] string $theme = '') : RedirectResponse|array {
    if (empty($theme)) {
      throw new AccessDeniedHttpException();
    }
    // Get current list of themes.
    $themes = $this->themeHandler
      ->listInfo();
    if (empty($themes[$theme])) {
      $this->messenger()
        ->addError($this->t('The %theme theme was not found.', [
        '%theme' => $theme,
      ]));
      return new RedirectResponse($this->getCancelUrl()
        ->toString());
    }
    $this->themeLabel = $themes[$theme]->info['name'];
    $config = $this->config('system.theme');
    if ($theme === $config->get('default')) {
      $this->messenger()
        ->addError($this->t('%theme is the default theme and cannot be uninstalled.', [
        '%theme' => $themes[$theme]->info['name'],
      ]));
      return new RedirectResponse($this->getCancelUrl()
        ->toString());
    }
    if ($theme === $config->get('admin')) {
      $this->messenger()
        ->addError($this->t('%theme is the admin theme and cannot be uninstalled.', [
        '%theme' => $themes[$theme]->info['name'],
      ]));
      return new RedirectResponse($this->getCancelUrl()
        ->toString());
    }
    $theme_info = $themes[$theme];
    $dependent_themes = [];
    if (!empty($theme_info->sub_themes)) {
      foreach ($theme_info->sub_themes as $sub_theme => $sub_label) {
        if (!empty($themes[$sub_theme]->status)) {
          $dependent_themes[] = $sub_label;
        }
      }
    }
    if (!empty($dependent_themes)) {
      $this->messenger()
        ->addError($this->t('%theme cannot be uninstalled because the following themes depend on it: %themes', [
        '%theme' => $theme_info->info['name'],
        '%themes' => implode(', ', $dependent_themes),
      ]));
      return new RedirectResponse($this->getCancelUrl()
        ->toString());
    }
    $form['text']['#markup'] = '<p>' . $this->t('The <em>%theme</em> theme will be completely uninstalled from your site, and all data from this theme will be lost!', [
      '%theme' => $theme_info->info['name'],
    ]) . '</p>';
    // List the dependent entities.
    $this->addDependencyListsToForm($form, 'theme', [
      $theme,
    ], $this->configManager, $this->entityTypeManager);
    $form['theme'] = [
      '#type' => 'value',
      '#value' => $theme,
    ];
    return parent::buildForm($form, $form_state);
  }
  
  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) : void {
    $themes = $this->themeHandler
      ->listInfo();
    $theme = $form_state->getValue('theme');
    $this->themeInstaller
      ->uninstall([
      $form_state->getValue('theme'),
    ]);
    $this->messenger()
      ->addStatus($this->t('The %theme theme has been uninstalled.', [
      '%theme' => $themes[$theme]->info['name'],
    ]));
    $form_state->setRedirectUrl($this->getCancelUrl());
  }

}