--- /dev/null
+<?php
+
+namespace Drupal\entity_browser\Plugin\views\display;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\views\Plugin\views\display\DisplayPluginBase;
+
+/**
+ * The plugin that handles entity browser display.
+ *
+ * "entity_browser_display" is a custom property, used with
+ * \Drupal\views\Views::getApplicableViews() to retrieve all views with a
+ * 'Entity Browser' display.
+ *
+ * @ingroup views_display_plugins
+ *
+ * @ViewsDisplay(
+ * id = "entity_browser",
+ * title = @Translation("Entity browser"),
+ * help = @Translation("Displays a view as Entity browser widget."),
+ * theme = "views_view",
+ * admin = @Translation("Entity browser"),
+ * entity_browser_display = TRUE
+ * )
+ */
+class EntityBrowser extends DisplayPluginBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function execute() {
+ parent::execute();
+ $render = ['view' => $this->view->render()];
+ $this->handleForm($render);
+ return $render;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function ajaxEnabled() {
+ // Force AJAX as this Display Plugin will almost always be embedded inside
+ // EntityBrowserForm, which breaks normal exposed form submits.
+ return TRUE;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function defineOptions() {
+ $options = parent::defineOptions();
+ $options['use_ajax']['default'] = TRUE;
+ return $options;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function optionsSummary(&$categories, &$options) {
+ parent::optionsSummary($categories, $options);
+ if (isset($options['use_ajax'])) {
+ $options['use_ajax']['value'] = $this->t('Yes (Forced)');
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildOptionsForm(&$form, FormStateInterface $form_state) {
+ parent::buildOptionsForm($form, $form_state);
+ // Disable the ability to toggle AJAX support, as we forcibly enable AJAX
+ // in our ajaxEnabled() implementation.
+ if (isset($form['use_ajax'])) {
+ $form['use_ajax'] = [
+ '#description' => $this->t('Entity Browser requires Views to use AJAX.'),
+ '#type' => 'checkbox',
+ '#title' => $this->t('Use AJAX'),
+ '#default_value' => 1,
+ '#disabled' => TRUE,
+ ];
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function preview() {
+ return $this->execute();
+ }
+
+ /**
+ * {@inheritdoc}
+ *
+ * Pre render callback for a view.
+ *
+ * Based on DisplayPluginBase::elementPreRender() except that we removed form
+ * part which need to handle by our own.
+ */
+ public function elementPreRender(array $element) {
+ $view = $element['#view'];
+ $empty = empty($view->result);
+
+ // Force a render array so CSS/JS can be attached.
+ if (!is_array($element['#rows'])) {
+ $element['#rows'] = ['#markup' => $element['#rows']];
+ }
+
+ $element['#header'] = $view->display_handler->renderArea('header', $empty);
+ $element['#footer'] = $view->display_handler->renderArea('footer', $empty);
+ $element['#empty'] = $empty ? $view->display_handler->renderArea('empty', $empty) : [];
+ $element['#exposed'] = !empty($view->exposed_widgets) ? $view->exposed_widgets : [];
+ $element['#more'] = $view->display_handler->renderMoreLink();
+ $element['#feed_icons'] = !empty($view->feedIcons) ? $view->feedIcons : [];
+
+ if ($view->display_handler->renderPager()) {
+ $exposed_input = isset($view->exposed_raw_input) ? $view->exposed_raw_input : NULL;
+ $element['#pager'] = $view->renderPager($exposed_input);
+ }
+
+ if (!empty($view->attachment_before)) {
+ $element['#attachment_before'] = $view->attachment_before;
+ }
+ if (!empty($view->attachment_after)) {
+ $element['#attachment_after'] = $view->attachment_after;
+ }
+
+ return $element;
+ }
+
+ /**
+ * Handles form elements on a view.
+ *
+ * @param array $render
+ * Rendered content.
+ */
+ protected function handleForm(array &$render) {
+ if (!empty($this->view->field['entity_browser_select'])) {
+
+ /** @var \Drupal\entity_browser\Plugin\views\field\SelectForm $select */
+ $select = $this->view->field['entity_browser_select'];
+ $select->viewsForm($render);
+
+ $render['#post_render'][] = [get_class($this), 'postRender'];
+ $substitutions = [];
+ foreach ($this->view->result as $row) {
+ $form_element_row_id = $select->getRowId($row);
+
+ $substitutions[] = [
+ 'placeholder' => '<!--form-item-entity_browser_select--' . $form_element_row_id . '-->',
+ 'field_name' => 'entity_browser_select',
+ 'row_id' => $form_element_row_id,
+ ];
+ }
+
+ $render['#substitutions'] = [
+ '#type' => 'value',
+ '#value' => $substitutions,
+ ];
+ }
+ }
+
+ /**
+ * Post render callback that moves form elements into the view.
+ *
+ * Form elements need to be added out of view to be correctly detected by Form
+ * API and then added into the view afterwards. Views use the same approach
+ * for bulk operations.
+ *
+ * @param string $content
+ * Rendered content.
+ * @param array $element
+ * Render array.
+ *
+ * @return string
+ * Rendered content.
+ */
+ public static function postRender($content, array $element) {
+ // Placeholders and their substitutions (usually rendered form elements).
+ $search = $replace = [];
+
+ // Add in substitutions provided by the form.
+ foreach ($element['#substitutions']['#value'] as $substitution) {
+ $field_name = $substitution['field_name'];
+ $row_id = $substitution['row_id'];
+
+ $search[] = $substitution['placeholder'];
+ $replace[] = isset($element[$field_name][$row_id]) ? \Drupal::service('renderer')->render($element[$field_name][$row_id]) : '';
+ }
+ // Add in substitutions from hook_views_form_substitutions().
+ $substitutions = \Drupal::moduleHandler()->invokeAll('views_form_substitutions');
+ foreach ($substitutions as $placeholder => $substitution) {
+ $search[] = $placeholder;
+ $replace[] = $substitution;
+ }
+
+ // We cannot render exposed form within the View, as nested forms are not
+ // standard and will break entity selection.
+ $search[] = '<form';
+ $replace[] = '<div';
+ $search[] = '</form>';
+ $replace[] = '</div>';
+
+ $content = str_replace($search, $replace, $content);
+
+ return $content;
+ }
+
+}
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