SlideBaseForm.php in Drupal Slider 8.2

Namespace

Drupal\drupal_slider\Form

File

src/Form/SlideBaseForm.php

<?php

namespace Drupal\drupal_slider\Form;

use Drupal\Core\Form\FormStateInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Drupal\Core\Entity\EntityForm;
use Drupal\Core\Entity\EntityStorageInterface;
use Drupal\Core\Link;

/**
 * Class SlideBaseForm.
 *
 * @ingroup drupal_slider
 */
class SlideBaseForm extends EntityForm {

  /**
   * Protected variable.
   *
   * @var \Drupal\Core\Entity\EntityStorageInterface
   */
  protected $entityStorage;

  /**
   * Function __construct.
   */
  public function __construct(EntityStorageInterface $entity_storage) {
    $this->entityStorage = $entity_storage;
  }

  /**
   * Function create.
   */
  public static function create(ContainerInterface $container) {
    $form = new static($container
      ->get('entity_type.manager')
      ->getStorage('drupal_slider_slide'));
    $form
      ->setMessenger($container
      ->get('messenger'));
    return $form;
  }

  /**
   * Function buildForm.
   */
  public function buildForm(array $form, FormStateInterface $form_state) {

    // Get anything we need from the base class.
    $form = parent::buildForm($form, $form_state);
    $slide = $this->entity;
    $form['#tree'] = TRUE;
    $form['label'] = [
      '#type' => 'textfield',
      '#title' => $this
        ->t('Slide Name'),
      '#maxlength' => 255,
      '#default_value' => $slide
        ->label(),
      '#required' => TRUE,
    ];
    $form['id'] = [
      '#type' => 'machine_name',
      '#title' => $this
        ->t('Machine name'),
      '#default_value' => $slide
        ->id(),
      '#machine_name' => [
        'exists' => [
          $this,
          'exists',
        ],
        'replace_pattern' => '([^a-z0-9_]+)|(^custom$)',
        'error' => 'The machine-readable name must be unique, and can only contain lowercase letters, numbers, and underscores. Additionally, it can not be the reserved word "custom".',
      ],
      '#disabled' => !$slide
        ->isNew(),
    ];
    $form['layers'] = [
      '#type' => 'table',
      '#header' => [
        $this
          ->t('Layer number'),
        $this
          ->t('Attributes'),
        $this
          ->t('Weight'),
      ],
      '#empty' => $this
        ->t('Sorry, There are no layers!'),
      '#prefix' => '<div id="names-fieldset-wrapper">',
      '#suffix' => '</div>',
      '#tabledrag' => [
        [
          'action' => 'order',
          'relationship' => 'sibling',
          'group' => 'table-sort-weight',
        ],
      ],
    ];
    return $form;
  }

  /**
   * Checks an existing Slide.
   */
  public function exists($entity_id, array $element, FormStateInterface $form_state) {
    $query = $this->entityStorage
      ->getQuery();

    // Query the entity ID to see if its in use.
    $result = $query
      ->condition('id', $element['#field_prefix'] . $entity_id)
      ->execute();

    // We don't need to return the ID, only if it exists or not.
    return (bool) $result;
  }

  /**
   * Callback for both ajax-enabled buttons.
   *
   * Selects and returns the fieldset with the names in it.
   */
  public function addmoreCallback(array &$form, FormStateInterface $form_state) {
    return $form['layers'];
  }

  /**
   * Submit handler for the "add-one-more" button.
   *
   * Increments the max counter and causes a rebuild.
   */
  public function addOne(array &$form, FormStateInterface $form_state) {
    $name_field = $form_state
      ->get('num_names');
    $add_button = $name_field + 1;
    $form_state
      ->set('num_names', $add_button);
    $form_state
      ->setRebuild();
  }

  /**
   * Submit handler for the "remove one" button.
   *
   * Decrements the max counter and causes a form rebuild.
   */
  public function removeCallback(array &$form, FormStateInterface $form_state) {
    $name_field = $form_state
      ->get('num_names');
    if ($name_field > 1) {
      $remove_button = $name_field - 1;
      $form_state
        ->set('num_names', $remove_button);
    }

    // Since our buildForm() method relies on the value of 'num_names' to
    // generate 'name' form elements, we have to tell the form to rebuild. If we
    // don't do this, the form builder will not call buildForm().
    $form_state
      ->setRebuild();
  }

  /**
   * Function actions.
   */
  protected function actions(array $form, FormStateInterface $form_state) {

    // Get the basic actins from the base class.
    $actions = parent::actions($form, $form_state);

    // Change the submit button text.
    $actions['submit']['#value'] = $this
      ->t('Save');

    // Return the result.
    return $actions;
  }

  /**
   * Function save.
   */
  public function save(array $form, FormStateInterface $form_state) {

    // EntityForm provides us with the entity we're working on.
    $slide = $this
      ->getEntity();

    // Drupal already populated the form values in the entity object. Each
    // form field was saved as a public variable in the entity class. PHP
    // allows Drupal to do this even if the method is not defined ahead of
    // time.
    $status = $slide
      ->save();

    // Grab the URL of the new entity. We'll use it in the message.
    $url = $slide
      ->toUrl();

    // Create an edit link.
    $edit_link = Link::fromTextAndUrl($this
      ->t('Edit'), $url)
      ->toString();
    if ($status == SAVED_UPDATED) {

      // If we edited an existing entity...
      $this
        ->messenger()
        ->addMessage($this
        ->t('Slide %label has been updated.', [
        '%label' => $slide
          ->label(),
      ]));
      $this
        ->logger('contact')
        ->notice('Slide %label has been updated.', [
        '%label' => $slide
          ->label(),
        'link' => $edit_link,
      ]);
    }
    else {

      // If we created a new entity...
      $this
        ->messenger()
        ->addMessage($this
        ->t('Slide %label has been added.', [
        '%label' => $slide
          ->label(),
      ]));
      $this
        ->logger('contact')
        ->notice('Slide %label has been added.', [
        '%label' => $slide
          ->label(),
        'link' => $edit_link,
      ]);
    }

    // Redirect the user back to the listing route after the save operation.
    $form_state
      ->setRedirect('entity.drupal_slider_slide.list');
  }

}

Classes

Name	Description
SlideBaseForm	Class SlideBaseForm.