ModulesUninstallForm::buildForm

public ModulesUninstallForm::buildForm(array $form, FormStateInterface $form_state)

public function buildForm(array $form, FormStateInterface $form_state) {
  // Make sure the install API is available.
  include_once DRUPAL_ROOT . '/core/includes/install.inc';

  // Get a list of all available modules.
  $modules = system_rebuild_module_data();
  $uninstallable = array_filter($modules, function($module) use ($modules) {
    return empty($modules[$module->getName()]->info['required']) && $module->status;
  });

  // Include system.admin.inc so we can use the sort callbacks.
  $this->moduleHandler->loadInclude('system', 'inc', 'system.admin');

  $form['filters'] = array(
    '#type' => 'container',
    '#attributes' => array(
      'class' => array('table-filter', 'js-show'),
    ),
  );

  $form['filters']['text'] = array(
    '#type' => 'search',
    '#title' => $this->t('Filter modules'),
    '#title_display' => 'invisible',
    '#size' => 30,
    '#placeholder' => $this->t('Filter by name or description'),
    '#description' => $this->t('Enter a part of the module name or description'),
    '#attributes' => array(
      'class' => array('table-filter-text'),
      'data-table' => '#system-modules-uninstall',
      'autocomplete' => 'off',
    ),
  );

  $form['modules'] = array();

  // Only build the rest of the form if there are any modules available to
  // uninstall;
  if (empty($uninstallable)) {
    return $form;
  }

  $profile = drupal_get_profile();

  // Sort all modules by their name.
  uasort($uninstallable, 'system_sort_modules_by_info_name');
  $validation_reasons = $this->moduleInstaller->validateUninstall(array_keys($uninstallable));

  $form['uninstall'] = array('#tree' => TRUE);
  foreach ($uninstallable as $module_key => $module) {
    $name = $module->info['name'] ? : $module->getName();
    $form['modules'][$module->getName()]['#module_name'] = $name;
    $form['modules'][$module->getName()]['name']['#markup'] = $name;
    $form['modules'][$module->getName()]['description']['#markup'] = $this->t($module->info['description']);

    $form['uninstall'][$module->getName()] = array(
      '#type' => 'checkbox',
      '#title' => $this->t('Uninstall @module module', array('@module' => $name)),
      '#title_display' => 'invisible',
    );

    // If a validator returns reasons not to uninstall a module,
    // list the reasons and disable the check box.
    if (isset($validation_reasons[$module_key])) {
      $form['modules'][$module->getName()]['#validation_reasons'] = $validation_reasons[$module_key];
      $form['uninstall'][$module->getName()]['#disabled'] = TRUE;
    }
    // All modules which depend on this one must be uninstalled first, before
    // we can allow this module to be uninstalled. (The installation profile
    // is excluded from this list.)
    foreach (array_keys($module->required_by) as $dependent) {
      if ($dependent != $profile && drupal_get_installed_schema_version($dependent) != SCHEMA_UNINSTALLED) {
        $name = isset($modules[$dependent]->info['name']) ? $modules[$dependent]->info['name'] : $dependent;
        $form['modules'][$module->getName()]['#required_by'][] = $name;
        $form['uninstall'][$module->getName()]['#disabled'] = TRUE;
      }
    }
  }

  $form['#attached']['library'][] = 'system/drupal.system.modules';
  $form['actions'] = array('#type' => 'actions');
  $form['actions']['submit'] = array(
    '#type' => 'submit',
    '#value' => $this->t('Uninstall'),
  );

  return $form;
}