diff core/modules/layout_builder/src/Element/LayoutBuilder.php @ 5:12f9dff5fda9 tip

Update to Drupal core 8.7.1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/layout_builder/src/Element/LayoutBuilder.php	Thu May 09 15:34:47 2019 +0100
@@ -0,0 +1,405 @@
+<?php
+
+namespace Drupal\layout_builder\Element;
+
+use Drupal\Core\Ajax\AjaxHelperTrait;
+use Drupal\Core\Messenger\MessengerInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\Core\Plugin\PluginFormInterface;
+use Drupal\Core\Render\Element;
+use Drupal\Core\Render\Element\RenderElement;
+use Drupal\Core\Url;
+use Drupal\layout_builder\Context\LayoutBuilderContextTrait;
+use Drupal\layout_builder\LayoutBuilderHighlightTrait;
+use Drupal\layout_builder\LayoutTempstoreRepositoryInterface;
+use Drupal\layout_builder\OverridesSectionStorageInterface;
+use Drupal\layout_builder\SectionStorageInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Defines a render element for building the Layout Builder UI.
+ *
+ * @RenderElement("layout_builder")
+ *
+ * @internal
+ *   Plugin classes are internal.
+ */
+class LayoutBuilder extends RenderElement implements ContainerFactoryPluginInterface {
+
+  use AjaxHelperTrait;
+  use LayoutBuilderContextTrait;
+  use LayoutBuilderHighlightTrait;
+
+  /**
+   * The layout tempstore repository.
+   *
+   * @var \Drupal\layout_builder\LayoutTempstoreRepositoryInterface
+   */
+  protected $layoutTempstoreRepository;
+
+  /**
+   * The messenger service.
+   *
+   * @var \Drupal\Core\Messenger\MessengerInterface
+   */
+  protected $messenger;
+
+  /**
+   * Constructs a new LayoutBuilder.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin ID for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\layout_builder\LayoutTempstoreRepositoryInterface $layout_tempstore_repository
+   *   The layout tempstore repository.
+   * @param \Drupal\Core\Messenger\MessengerInterface $messenger
+   *   The messenger service.
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, LayoutTempstoreRepositoryInterface $layout_tempstore_repository, MessengerInterface $messenger) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $this->layoutTempstoreRepository = $layout_tempstore_repository;
+    $this->messenger = $messenger;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('layout_builder.tempstore_repository'),
+      $container->get('messenger')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getInfo() {
+    return [
+      '#section_storage' => NULL,
+      '#pre_render' => [
+        [$this, 'preRender'],
+      ],
+    ];
+  }
+
+  /**
+   * Pre-render callback: Renders the Layout Builder UI.
+   */
+  public function preRender($element) {
+    if ($element['#section_storage'] instanceof SectionStorageInterface) {
+      $element['layout_builder'] = $this->layout($element['#section_storage']);
+    }
+    return $element;
+  }
+
+  /**
+   * Renders the Layout UI.
+   *
+   * @param \Drupal\layout_builder\SectionStorageInterface $section_storage
+   *   The section storage.
+   *
+   * @return array
+   *   A render array.
+   */
+  protected function layout(SectionStorageInterface $section_storage) {
+    $this->prepareLayout($section_storage);
+
+    $output = [];
+    if ($this->isAjax()) {
+      $output['status_messages'] = [
+        '#type' => 'status_messages',
+      ];
+    }
+    $count = 0;
+    for ($i = 0; $i < $section_storage->count(); $i++) {
+      $output[] = $this->buildAddSectionLink($section_storage, $count);
+      $output[] = $this->buildAdministrativeSection($section_storage, $count);
+      $count++;
+    }
+    $output[] = $this->buildAddSectionLink($section_storage, $count);
+    $output['#attached']['library'][] = 'layout_builder/drupal.layout_builder';
+    // As the Layout Builder UI is typically displayed using the frontend theme,
+    // it is not marked as an administrative page at the route level even though
+    // it performs an administrative task. Mark this as an administrative page
+    // for JavaScript.
+    $output['#attached']['drupalSettings']['path']['currentPathIsAdmin'] = TRUE;
+    $output['#type'] = 'container';
+    $output['#attributes']['id'] = 'layout-builder';
+    $output['#attributes']['class'][] = 'layout-builder';
+    // Mark this UI as uncacheable.
+    $output['#cache']['max-age'] = 0;
+    return $output;
+  }
+
+  /**
+   * Prepares a layout for use in the UI.
+   *
+   * @param \Drupal\layout_builder\SectionStorageInterface $section_storage
+   *   The section storage.
+   */
+  protected function prepareLayout(SectionStorageInterface $section_storage) {
+    // If the layout has pending changes, add a warning.
+    if ($this->layoutTempstoreRepository->has($section_storage)) {
+      $this->messenger->addWarning($this->t('You have unsaved changes.'));
+    }
+    // If the layout is an override that has not yet been overridden, copy the
+    // sections from the corresponding default.
+    elseif ($section_storage instanceof OverridesSectionStorageInterface && !$section_storage->isOverridden()) {
+      $sections = $section_storage->getDefaultSectionStorage()->getSections();
+      foreach ($sections as $section) {
+        $section_storage->appendSection($section);
+      }
+      $this->layoutTempstoreRepository->set($section_storage);
+    }
+  }
+
+  /**
+   * Builds a link to add a new section at a given delta.
+   *
+   * @param \Drupal\layout_builder\SectionStorageInterface $section_storage
+   *   The section storage.
+   * @param int $delta
+   *   The delta of the section to splice.
+   *
+   * @return array
+   *   A render array for a link.
+   */
+  protected function buildAddSectionLink(SectionStorageInterface $section_storage, $delta) {
+    $storage_type = $section_storage->getStorageType();
+    $storage_id = $section_storage->getStorageId();
+
+    // If the delta and the count are the same, it is either the end of the
+    // layout or an empty layout.
+    if ($delta === count($section_storage)) {
+      if ($delta === 0) {
+        $title = $this->t('Add Section');
+      }
+      else {
+        $title = $this->t('Add Section <span class="visually-hidden">at end of layout</span>');
+      }
+    }
+    // If the delta and the count are different, it is either the beginning of
+    // the layout or in between two sections.
+    else {
+      if ($delta === 0) {
+        $title = $this->t('Add Section <span class="visually-hidden">at start of layout</span>');
+      }
+      else {
+        $title = $this->t('Add Section <span class="visually-hidden">between @first and @second</span>', ['@first' => $delta, '@second' => $delta + 1]);
+      }
+    }
+
+    return [
+      'link' => [
+        '#type' => 'link',
+        '#title' => $title,
+        '#url' => Url::fromRoute('layout_builder.choose_section',
+          [
+            'section_storage_type' => $storage_type,
+            'section_storage' => $storage_id,
+            'delta' => $delta,
+          ],
+          [
+            'attributes' => [
+              'class' => [
+                'use-ajax',
+                'layout-builder__link',
+                'layout-builder__link--add',
+              ],
+              'data-dialog-type' => 'dialog',
+              'data-dialog-renderer' => 'off_canvas',
+            ],
+          ]
+        ),
+      ],
+      '#type' => 'container',
+      '#attributes' => [
+        'class' => ['layout-builder__add-section'],
+        'data-layout-builder-highlight-id' => $this->sectionAddHighlightId($delta),
+      ],
+    ];
+  }
+
+  /**
+   * Builds the render array for the layout section while editing.
+   *
+   * @param \Drupal\layout_builder\SectionStorageInterface $section_storage
+   *   The section storage.
+   * @param int $delta
+   *   The delta of the section.
+   *
+   * @return array
+   *   The render array for a given section.
+   */
+  protected function buildAdministrativeSection(SectionStorageInterface $section_storage, $delta) {
+    $storage_type = $section_storage->getStorageType();
+    $storage_id = $section_storage->getStorageId();
+    $section = $section_storage->getSection($delta);
+
+    $layout = $section->getLayout();
+    $build = $section->toRenderArray($this->getAvailableContexts($section_storage), TRUE);
+    $layout_definition = $layout->getPluginDefinition();
+
+    $region_labels = $layout_definition->getRegionLabels();
+    foreach ($layout_definition->getRegions() as $region => $info) {
+      if (!empty($build[$region])) {
+        foreach (Element::children($build[$region]) as $uuid) {
+          $build[$region][$uuid]['#attributes']['class'][] = 'js-layout-builder-block';
+          $build[$region][$uuid]['#attributes']['class'][] = 'layout-builder-block';
+          $build[$region][$uuid]['#attributes']['data-layout-block-uuid'] = $uuid;
+          $build[$region][$uuid]['#attributes']['data-layout-builder-highlight-id'] = $this->blockUpdateHighlightId($uuid);
+          $build[$region][$uuid]['#contextual_links'] = [
+            'layout_builder_block' => [
+              'route_parameters' => [
+                'section_storage_type' => $storage_type,
+                'section_storage' => $storage_id,
+                'delta' => $delta,
+                'region' => $region,
+                'uuid' => $uuid,
+              ],
+              // Add metadata about the current operations available in
+              // contextual links. This will invalidate the client-side cache of
+              // links that were cached before the 'move' link was added.
+              // @see layout_builder.links.contextual.yml
+              'metadata' => [
+                'operations' => 'move:update:remove',
+              ],
+            ],
+          ];
+        }
+      }
+
+      $build[$region]['layout_builder_add_block']['link'] = [
+        '#type' => 'link',
+        // Add one to the current delta since it is zero-indexed.
+        '#title' => $this->t('Add Block <span class="visually-hidden">in section @section, @region region</span>', ['@section' => $delta + 1, '@region' => $region_labels[$region]]),
+        '#url' => Url::fromRoute('layout_builder.choose_block',
+          [
+            'section_storage_type' => $storage_type,
+            'section_storage' => $storage_id,
+            'delta' => $delta,
+            'region' => $region,
+          ],
+          [
+            'attributes' => [
+              'class' => [
+                'use-ajax',
+                'layout-builder__link',
+                'layout-builder__link--add',
+              ],
+              'data-dialog-type' => 'dialog',
+              'data-dialog-renderer' => 'off_canvas',
+            ],
+          ]
+        ),
+      ];
+      $build[$region]['layout_builder_add_block']['#type'] = 'container';
+      $build[$region]['layout_builder_add_block']['#attributes'] = [
+        'class' => ['layout-builder__add-block'],
+        'data-layout-builder-highlight-id' => $this->blockAddHighlightId($delta, $region),
+      ];
+      $build[$region]['layout_builder_add_block']['#weight'] = 1000;
+      $build[$region]['#attributes']['data-region'] = $region;
+      $build[$region]['#attributes']['class'][] = 'layout-builder__region';
+      $build[$region]['#attributes']['class'][] = 'js-layout-builder-region';
+      $build[$region]['#attributes']['role'] = 'group';
+      $build[$region]['#attributes']['aria-label'] = $this->t('@region region in section @section', [
+        '@region' => $info['label'],
+        '@section' => $delta + 1,
+      ]);
+
+      // Get weights of all children for use by the region label.
+      $weights = array_map(function ($a) {
+        return isset($a['#weight']) ? $a['#weight'] : 0;
+      }, $build[$region]);
+
+      // The region label is made visible when the move block dialog is open.
+      $build[$region]['region_label'] = [
+        '#type' => 'container',
+        '#attributes' => [
+          'class' => ['layout__region-info', 'layout-builder__region-label'],
+          // A more detailed version of this information is already read by
+          // screen readers, so this label can be hidden from them.
+          'aria-hidden' => TRUE,
+        ],
+        '#markup' => $this->t('Region: @region', ['@region' => $info['label']]),
+        // Ensures the region label is displayed first.
+        '#weight' => min($weights) - 1,
+      ];
+    }
+
+    $build['#attributes']['data-layout-update-url'] = Url::fromRoute('layout_builder.move_block', [
+      'section_storage_type' => $storage_type,
+      'section_storage' => $storage_id,
+    ])->toString();
+
+    $build['#attributes']['data-layout-delta'] = $delta;
+    $build['#attributes']['class'][] = 'layout-builder__layout';
+    $build['#attributes']['data-layout-builder-highlight-id'] = $this->sectionUpdateHighlightId($delta);
+
+    return [
+      '#type' => 'container',
+      '#attributes' => [
+        'class' => ['layout-builder__section'],
+        'role' => 'group',
+        'aria-label' => $this->t('Section @section', ['@section' => $delta + 1]),
+      ],
+      'remove' => [
+        '#type' => 'link',
+        '#title' => $this->t('Remove section <span class="visually-hidden">@section</span>', ['@section' => $delta + 1]),
+        '#url' => Url::fromRoute('layout_builder.remove_section', [
+          'section_storage_type' => $storage_type,
+          'section_storage' => $storage_id,
+          'delta' => $delta,
+        ]),
+        '#attributes' => [
+          'class' => [
+            'use-ajax',
+            'layout-builder__link',
+            'layout-builder__link--remove',
+          ],
+          'data-dialog-type' => 'dialog',
+          'data-dialog-renderer' => 'off_canvas',
+        ],
+      ],
+      // The section label is added to sections without a "Configure Section"
+      // link, and is only visible when the move block dialog is open.
+      'section_label' => [
+        '#markup' => $this->t('<span class="layout-builder__section-label" aria-hidden="true">Section @section</span>', ['@section' => $delta + 1]),
+        '#access' => !$layout instanceof PluginFormInterface,
+      ],
+      'configure' => [
+        '#type' => 'link',
+        // There are two instances of @section, the one wrapped in
+        // .visually-hidden is for screen readers. The one wrapped in
+        // .layout-builder__section-label is only visible when the
+        // move block dialog is open and it is not seen by screen readers.
+        '#title' => $this->t('Configure section <span class="visually-hidden">@section</span><span aria-hidden="true" class="layout-builder__section-label">@section</span>', ['@section' => $delta + 1]),
+        '#access' => $layout instanceof PluginFormInterface,
+        '#url' => Url::fromRoute('layout_builder.configure_section', [
+          'section_storage_type' => $storage_type,
+          'section_storage' => $storage_id,
+          'delta' => $delta,
+        ]),
+        '#attributes' => [
+          'class' => [
+            'use-ajax',
+            'layout-builder__link',
+            'layout-builder__link--configure',
+          ],
+          'data-dialog-type' => 'dialog',
+          'data-dialog-renderer' => 'off_canvas',
+        ],
+      ],
+      'layout-builder__section' => $build,
+    ];
+  }
+
+}