public function ViewsExposedForm::buildForm in Drupal 8

Same name and namespace in other branches

1. 9 core/modules/views/src/Form/ViewsExposedForm.php \Drupal\views\Form\ViewsExposedForm::buildForm()
2. 10 core/modules/views/src/Form/ViewsExposedForm.php \Drupal\views\Form\ViewsExposedForm::buildForm()

Form constructor.

Parameters

array $form: An associative array containing the structure of the form.

\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.

Return value

array The form structure.

Overrides FormInterface::buildForm

File

core/modules/views/src/Form/ViewsExposedForm.php, line 73

Class

ViewsExposedForm

Provides the views exposed form.

Namespace

Drupal\views\Form

Code

public function buildForm(array $form, FormStateInterface $form_state) {

  // Don't show the form when batch operations are in progress.
  if ($batch = batch_get() && isset($batch['current_set'])) {
    return [
      // Set the theme callback to be nothing to avoid errors in template_preprocess_views_exposed_form().
      '#theme' => '',
    ];
  }

  // Make sure that we validate because this form might be submitted
  // multiple times per page.
  $form_state
    ->setValidationEnforced();

  /** @var \Drupal\views\ViewExecutable $view */
  $view = $form_state
    ->get('view');
  $display =& $form_state
    ->get('display');
  $form_state
    ->setUserInput($view
    ->getExposedInput());

  // Let form plugins know this is for exposed widgets.
  $form_state
    ->set('exposed', TRUE);

  // Check if the form was already created
  if ($cache = $this->exposedFormCache
    ->getForm($view->storage
    ->id(), $view->current_display)) {
    return $cache;
  }
  $form['#info'] = [];

  // Go through each handler and let it generate its exposed widget.
  foreach ($view->display_handler->handlers as $type => $value) {

    /** @var \Drupal\views\Plugin\views\ViewsHandlerInterface $handler */
    foreach ($view->{$type} as $id => $handler) {
      if ($handler
        ->canExpose() && $handler
        ->isExposed()) {

        // Grouped exposed filters have their own forms.
        // Instead of render the standard exposed form, a new Select or
        // Radio form field is rendered with the available groups.
        // When an user chooses an option the selected value is split
        // into the operator and value that the item represents.
        if ($handler
          ->isAGroup()) {
          $handler
            ->groupForm($form, $form_state);
          $id = $handler->options['group_info']['identifier'];
        }
        else {
          $handler
            ->buildExposedForm($form, $form_state);
        }
        if ($info = $handler
          ->exposedInfo()) {
          $form['#info']["{$type}-{$id}"] = $info;
        }
      }
    }
  }
  $form['actions'] = [
    '#type' => 'actions',
  ];
  $form['actions']['submit'] = [
    // Prevent from showing up in \Drupal::request()->query.
    '#name' => '',
    '#type' => 'submit',
    '#value' => $this
      ->t('Apply'),
    '#id' => Html::getUniqueId('edit-submit-' . $view->storage
      ->id()),
  ];
  if (!$view
    ->hasUrl()) {

    // On any non views.ajax route, use the current route for the form action.
    if ($this
      ->getRouteMatch()
      ->getRouteName() !== 'views.ajax') {
      $form_action = Url::fromRoute('<current>')
        ->toString();
    }
    else {

      // On the views.ajax route, set the action to the page we were on.
      $form_action = Url::fromUserInput($this->currentPathStack
        ->getPath())
        ->toString();
    }
  }
  else {
    $form_action = $view
      ->getUrl()
      ->toString();
  }
  $form['#action'] = $form_action;
  $form['#theme'] = $view
    ->buildThemeFunctions('views_exposed_form');
  $form['#id'] = Html::cleanCssIdentifier('views_exposed_form-' . $view->storage
    ->id() . '-' . $display['id']);

  /** @var \Drupal\views\Plugin\views\exposed_form\ExposedFormPluginInterface $exposed_form_plugin */
  $exposed_form_plugin = $view->display_handler
    ->getPlugin('exposed_form');
  $exposed_form_plugin
    ->exposedFormAlter($form, $form_state);

  // Save the form.
  $this->exposedFormCache
    ->setForm($view->storage
    ->id(), $view->current_display, $form);
  return $form;
}