YamlFormHandlerFormBase.php in YAML Form 8

Namespace

Drupal\yamlform\Form

File

src/Form/YamlFormHandlerFormBase.php

<?php

namespace Drupal\yamlform\Form;

use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormState;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Component\Plugin\Exception\PluginNotFoundException;
use Drupal\yamlform\YamlFormDialogTrait;
use Drupal\yamlform\YamlFormHandlerInterface;
use Drupal\yamlform\YamlFormInterface;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

/**
 * Provides a base form for form handlers.
 */
abstract class YamlFormHandlerFormBase extends FormBase {
  use YamlFormDialogTrait;

  /**
   * The form.
   *
   * @var \Drupal\yamlform\YamlFormInterface
   */
  protected $yamlform;

  /**
   * The form handler.
   *
   * @var \Drupal\yamlform\YamlFormHandlerInterface
   */
  protected $yamlformHandler;

  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'yamlform_handler_form';
  }

  /**
   * {@inheritdoc}
   *
   * @param \Drupal\yamlform\YamlFormInterface $yamlform
   *   The form.
   * @param string $yamlform_handler
   *   The form handler ID.
   *
   * @return array
   *   The form structure.
   *
   * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
   *   Throws not found exception if the number of handler instances for this
   *   form exceeds the handler's cardinality.
   */
  public function buildForm(array $form, FormStateInterface $form_state, YamlFormInterface $yamlform = NULL, $yamlform_handler = NULL) {
    $this->yamlform = $yamlform;
    try {
      $this->yamlformHandler = $this
        ->prepareYamlFormHandler($yamlform_handler);
    } catch (PluginNotFoundException $e) {
      throw new NotFoundHttpException("Invalid handler id: '{$yamlform_handler}'.");
    }

    // Limit the number of plugin instanced allowed.
    if (!$this->yamlformHandler
      ->getHandlerId()) {
      $plugin_id = $this->yamlformHandler
        ->getPluginId();
      $cardinality = $this->yamlformHandler
        ->cardinality();
      $number_of_instances = $yamlform
        ->getHandlers($plugin_id)
        ->count();
      if ($cardinality !== YamlFormHandlerInterface::CARDINALITY_UNLIMITED && $cardinality <= $number_of_instances) {
        $t_args = [
          '@number' => $cardinality,
          '@instances' => $this
            ->formatPlural($cardinality, $this
            ->t('instance is'), $this
            ->t('instances are')),
        ];
        throw new NotFoundHttpException($this
          ->t('Only @number @instance permitted', $t_args));
      }
    }
    $request = $this
      ->getRequest();
    $form['description'] = [
      '#markup' => $this->yamlformHandler
        ->description(),
      '#prefix' => '<p>',
      '#suffix' => '</p>',
    ];
    $form['id'] = [
      '#type' => 'value',
      '#value' => $this->yamlformHandler
        ->getPluginId(),
    ];
    $form['status'] = [
      '#type' => 'checkbox',
      '#title' => $this
        ->t('Enable the %name handler.', [
        '%name' => $this->yamlformHandler
          ->label(),
      ]),
      '#default_value' => $this->yamlformHandler
        ->isEnabled(),
      // Disable broken plugins.
      '#disabled' => $this->yamlformHandler
        ->getPluginId() == 'broken',
    ];
    $form['label'] = [
      '#type' => 'textfield',
      '#title' => $this
        ->t('Title'),
      '#maxlength' => 255,
      '#default_value' => $this->yamlformHandler
        ->label(),
      '#required' => TRUE,
      '#attributes' => [
        'autofocus' => 'autofocus',
      ],
    ];
    $form['handler_id'] = [
      '#type' => 'machine_name',
      '#maxlength' => 64,
      '#description' => $this
        ->t('A unique name for this handler instance. Must be alpha-numeric and underscore separated.'),
      '#default_value' => $this->yamlformHandler
        ->getHandlerId() ?: $this
        ->getUniqueMachineName($this->yamlformHandler),
      '#required' => TRUE,
      '#disabled' => $this->yamlformHandler
        ->getHandlerId() ? TRUE : FALSE,
      '#machine_name' => [
        'exists' => [
          $this,
          'exists',
        ],
      ],
    ];
    $form['settings'] = $this->yamlformHandler
      ->buildConfigurationForm([], $form_state);

    // Get $form['settings']['#attributes']['novalidate'] and apply it to the
    // $form.
    // This allows handlers with hide/show logic to skip HTML5 validation.
    // @see http://stackoverflow.com/questions/22148080/an-invalid-form-control-with-name-is-not-focusable
    if (isset($form['settings']['#attributes']['novalidate'])) {
      $form['#attributes']['novalidate'] = 'novalidate';
    }
    $form['settings']['#tree'] = TRUE;

    // Check the URL for a weight, then the form handler,
    // otherwise use default.
    $form['weight'] = [
      '#type' => 'hidden',
      '#value' => $request->query
        ->has('weight') ? (int) $request->query
        ->get('weight') : $this->yamlformHandler
        ->getWeight(),
    ];
    $form['actions'] = [
      '#type' => 'actions',
    ];
    $form['actions']['submit'] = [
      '#type' => 'submit',
      '#value' => $this
        ->t('Save'),
      '#button_type' => 'primary',
    ];
    $form = $this
      ->buildDialog($form, $form_state);
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function validateForm(array &$form, FormStateInterface $form_state) {

    // The form handler configuration is stored in the 'settings' key in
    // the form, pass that through for validation.
    $settings = $form_state
      ->getValue('settings') ?: [];
    $handler_state = (new FormState())
      ->setValues($settings);
    $this->yamlformHandler
      ->validateConfigurationForm($form, $handler_state);

    // Process handler state form errors.
    $this
      ->processHandlerFormErrors($handler_state, $form_state);

    // Update the original form values.
    $form_state
      ->setValue('settings', $handler_state
      ->getValues());
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    if ($response = $this
      ->validateDialog($form, $form_state)) {
      return $response;
    }
    $form_state
      ->cleanValues();

    // The form handler configuration is stored in the 'settings' key in
    // the form, pass that through for submission.
    $handler_data = (new FormState())
      ->setValues($form_state
      ->getValue('settings'));
    $this->yamlformHandler
      ->submitConfigurationForm($form, $handler_data);

    // Update the original form values.
    $form_state
      ->setValue('settings', $handler_data
      ->getValues());
    $is_new = $this->yamlformHandler
      ->getHandlerId() ? FALSE : TRUE;
    $this->yamlformHandler
      ->setHandlerId($form_state
      ->getValue('handler_id'));
    $this->yamlformHandler
      ->setLabel($form_state
      ->getValue('label'));
    $this->yamlformHandler
      ->setStatus($form_state
      ->getValue('status'));
    $this->yamlformHandler
      ->setWeight($form_state
      ->getValue('weight'));
    if ($is_new) {
      $this->yamlform
        ->addYamlFormHandler($this->yamlformHandler
        ->getConfiguration());
    }
    $this->yamlform
      ->save();

    // Display status message.
    drupal_set_message($this
      ->t('The form handler was successfully applied.'));

    // Redirect.
    return $this
      ->redirectForm($form, $form_state, $this->yamlform
      ->toUrl('handlers-form'));
  }

  /**
   * Generates a unique machine name for a form handler instance.
   *
   * @param \Drupal\yamlform\YamlFormHandlerInterface $handler
   *   The form handler.
   *
   * @return string
   *   Returns the unique name.
   */
  public function getUniqueMachineName(YamlFormHandlerInterface $handler) {
    $suggestion = $handler
      ->getPluginId();
    $count = 1;
    $machine_default = $suggestion;
    $instance_ids = $this->yamlform
      ->getHandlers()
      ->getInstanceIds();
    while (isset($instance_ids[$machine_default])) {
      $machine_default = $suggestion . '_' . $count++;
    }

    // Only return a suggestion if it is not the default plugin id.
    return $machine_default != $handler
      ->getPluginId() ? $machine_default : '';
  }

  /**
   * Determines if the form handler ID already exists.
   *
   * @param string $handler_id
   *   The form handler ID.
   *
   * @return bool
   *   TRUE if the form handler ID exists, FALSE otherwise.
   */
  public function exists($handler_id) {
    $instance_ids = $this->yamlform
      ->getHandlers()
      ->getInstanceIds();
    return isset($instance_ids[$handler_id]) ? TRUE : FALSE;
  }

  /**
   * Process handler form errors in form.
   *
   * @param FormStateInterface $handler_state
   *   The form handler form state.
   * @param FormStateInterface &$form_state
   *   The form state.
   */
  protected function processHandlerFormErrors(FormStateInterface $handler_state, FormStateInterface &$form_state) {
    foreach ($handler_state
      ->getErrors() as $name => $message) {
      $form_state
        ->setErrorByName($name, $message);
    }
  }

}

Classes

Name	Description
YamlFormHandlerFormBase	Provides a base form for form handlers.