--- /dev/null
+<?php
+
+namespace Drupal\views\Form;
+
+use Drupal\Component\Utility\Html;
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Render\Element\Checkboxes;
+use Drupal\Core\Url;
+use Drupal\views\ExposedFormCache;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides the views exposed form.
+ */
+class ViewsExposedForm extends FormBase {
+
+ /**
+ * The exposed form cache.
+ *
+ * @var \Drupal\views\ExposedFormCache
+ */
+ protected $exposedFormCache;
+
+ /**
+ * Constructs a new ViewsExposedForm
+ *
+ * @param \Drupal\views\ExposedFormCache $exposed_form_cache
+ * The exposed form cache.
+ */
+ public function __construct(ExposedFormCache $exposed_form_cache) {
+ $this->exposedFormCache = $exposed_form_cache;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static($container->get('views.exposed_form_cache'));
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return 'views_exposed_form';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ 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() && $handler->isExposed()) {
+ // Grouped exposed filters have their own forms.
+ // Instead of render the standard exposed form, a new Select or
+ // Radio form field is rendered with the available groups.
+ // When an user choose an option the selected value is split
+ // into the operator and value that the item represents.
+ if ($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()),
+ ];
+
+ $form['#action'] = $view->hasUrl() ? $view->getUrl()->toString() : Url::fromRoute('<current>')->toString();
+ $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 $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function validateForm(array &$form, FormStateInterface $form_state) {
+ $view = $form_state->get('view');
+
+ foreach (['field', 'filter'] as $type) {
+ /** @var \Drupal\views\Plugin\views\ViewsHandlerInterface[] $handlers */
+ $handlers = &$view->$type;
+ foreach ($handlers as $key => $handler) {
+ $handlers[$key]->validateExposed($form, $form_state);
+ }
+ }
+ /** @var \Drupal\views\Plugin\views\exposed_form\ExposedFormPluginInterface $exposed_form_plugin */
+ $exposed_form_plugin = $view->display_handler->getPlugin('exposed_form');
+ $exposed_form_plugin->exposedFormValidate($form, $form_state);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ // Form input keys that will not be included in $view->exposed_raw_data.
+ $exclude = ['submit', 'form_build_id', 'form_id', 'form_token', 'exposed_form_plugin', 'reset'];
+ $values = $form_state->getValues();
+ foreach (['field', 'filter'] as $type) {
+ /** @var \Drupal\views\Plugin\views\ViewsHandlerInterface[] $handlers */
+ $handlers = &$form_state->get('view')->$type;
+ foreach ($handlers as $key => $info) {
+ if ($handlers[$key]->acceptExposedInput($values)) {
+ $handlers[$key]->submitExposed($form, $form_state);
+ }
+ else {
+ // The input from the form did not validate, exclude it from the
+ // stored raw data.
+ $exclude[] = $key;
+ }
+ }
+ }
+
+ $view = $form_state->get('view');
+ $view->exposed_data = $values;
+ $view->exposed_raw_input = [];
+
+ $exclude = ['submit', 'form_build_id', 'form_id', 'form_token', 'exposed_form_plugin', 'reset'];
+ /** @var \Drupal\views\Plugin\views\exposed_form\ExposedFormPluginBase $exposed_form_plugin */
+ $exposed_form_plugin = $view->display_handler->getPlugin('exposed_form');
+ $exposed_form_plugin->exposedFormSubmit($form, $form_state, $exclude);
+ foreach ($values as $key => $value) {
+ if (!empty($key) && !in_array($key, $exclude)) {
+ if (is_array($value)) {
+ // Handle checkboxes, we only want to include the checked options.
+ // @todo: revisit the need for this when
+ // https://www.drupal.org/node/342316 is resolved.
+ $checked = Checkboxes::getCheckedCheckboxes($value);
+ foreach ($checked as $option_id) {
+ $view->exposed_raw_input[$option_id] = $value[$option_id];
+ }
+ }
+ else {
+ $view->exposed_raw_input[$key] = $value;
+ }
+ }
+ }
+ }
+
+}
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