DeleteForm.php

1. 8.x drupal/core/modules/forum/lib/Drupal/forum/Form/DeleteForm.php
2. 8.x drupal/core/modules/contact/lib/Drupal/contact/Form/DeleteForm.php
3. 8.x drupal/core/modules/views_ui/lib/Drupal/views_ui/Form/DeleteForm.php
4. 8.x drupal/core/modules/path/lib/Drupal/path/Form/DeleteForm.php
5. 8.x drupal/core/modules/action/lib/Drupal/action/Form/DeleteForm.php

<?php

/**
 * @file
 * Contains \Drupal\forum\Form\DeleteForm.
 */
namespace Drupal\forum\Form;

use Drupal\Core\Form\ConfirmFormBase;
use Drupal\taxonomy\Plugin\Core\Entity\Term;

/**
 * Builds the form to delete a forum term.
 */
class DeleteForm extends ConfirmFormBase {

  /**
   * The taxonomy term being deleted.
   *
   * @var \Drupal\taxonomy\Plugin\Core\Entity\Term
   */
  protected $taxonomyTerm;

  /**
   * {@inheritdoc}
   */
  public function getFormID() {
    return 'forum_confirm_delete';
  }

  /**
   * {@inheritdoc}
   */
  protected function getQuestion() {
    return t('Are you sure you want to delete the forum %label?', array(
      '%label' => $this->taxonomyTerm
        ->label(),
    ));
  }

  /**
   * {@inheritdoc}
   */
  protected function getCancelPath() {
    return 'admin/structure/forum';
  }

  /**
   * {@inheritdoc}
   */
  protected function getConfirmText() {
    return t('Delete');
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, array &$form_state, Term $taxonomy_term = NULL) {
    $this->taxonomyTerm = $taxonomy_term;
    return parent::buildForm($form, $form_state);
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, array &$form_state) {
    $this->taxonomyTerm
      ->delete();
    drupal_set_message(t('The forum %label and all sub-forums have been deleted.', array(
      '%label' => $this->taxonomyTerm
        ->label(),
    )));
    watchdog('forum', 'forum: deleted %label and all its sub-forums.', array(
      '%label' => $this->taxonomyTerm
        ->label(),
    ), WATCHDOG_NOTICE);
    $form_state['redirect'] = 'admin/structure/forum';
  }

}