PageBlockDisplayVariant.php in Page Manager 8.4

Namespace

Drupal\page_manager\Plugin\DisplayVariant

File

src/Plugin/DisplayVariant/PageBlockDisplayVariant.php

<?php

namespace Drupal\page_manager\Plugin\DisplayVariant;

use Drupal\Component\Render\HtmlEscapedText;
use Drupal\Component\Uuid\UuidInterface;
use Drupal\Component\Utility\Html;
use Drupal\Core\Block\BlockManager;
use Drupal\Core\Cache\Cache;
use Drupal\Core\Cache\CacheableMetadata;
use Drupal\Core\Condition\ConditionManager;
use Drupal\Core\Extension\ModuleHandlerInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Plugin\Context\ContextHandlerInterface;
use Drupal\Core\Plugin\ContextAwarePluginInterface;
use Drupal\Core\Render\Element;
use Drupal\Core\Render\Markup;
use Drupal\Core\Security\TrustedCallbackInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\Utility\Token;
use Drupal\ctools\Plugin\DisplayVariant\BlockDisplayVariant;
use Drupal\ctools\Plugin\PluginWizardInterface;
use Drupal\page_manager_ui\Form\VariantPluginContentForm;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a variant plugin that simply contains blocks.
 *
 * @DisplayVariant(
 *   id = "block_display",
 *   admin_label = @Translation("Block page")
 * )
 */
class PageBlockDisplayVariant extends BlockDisplayVariant implements PluginWizardInterface, TrustedCallbackInterface {

  /**
   * The module handler.
   *
   * @var \Drupal\Core\Extension\ModuleHandlerInterface
   */
  protected $moduleHandler;

  /**
   * Constructs a new BlockDisplayVariant.
   *
   * @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\Core\Plugin\Context\ContextHandlerInterface $context_handler
   *   The context handler.
   * @param \Drupal\Core\Session\AccountInterface $account
   *   The current user.
   * @param \Drupal\Component\Uuid\UuidInterface $uuid_generator
   *   The UUID generator.
   * @param \Drupal\Core\Utility\Token $token
   *   The token service.
   * @param \Drupal\Core\Block\BlockManager $block_manager
   *   The block manager.
   * @param \Drupal\Core\Condition\ConditionManager $condition_manager
   *   The condition manager.
   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
   *   The module handler.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, ContextHandlerInterface $context_handler, AccountInterface $account, UuidInterface $uuid_generator, Token $token, BlockManager $block_manager, ConditionManager $condition_manager, ModuleHandlerInterface $module_handler) {
    parent::__construct($configuration, $plugin_id, $plugin_definition, $context_handler, $account, $uuid_generator, $token, $block_manager, $condition_manager);
    $this->moduleHandler = $module_handler;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static($configuration, $plugin_id, $plugin_definition, $container
      ->get('context.handler'), $container
      ->get('current_user'), $container
      ->get('uuid'), $container
      ->get('token'), $container
      ->get('plugin.manager.block'), $container
      ->get('plugin.manager.condition'), $container
      ->get('module_handler'));
  }

  /**
   * {@inheritdoc}
   */
  public static function trustedCallbacks() {
    return [
      'buildRegions',
      'buildBlock',
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function build() {

    // Set default page cache keys that include the display.
    $build['#cache']['keys'] = [
      'page_manager_block_display',
      $this
        ->id(),
    ];
    $build['#pre_render'][] = [
      $this,
      'buildRegions',
    ];
    return $build;
  }

  /**
   * #pre_render callback for building the regions.
   */
  public function buildRegions(array $build) {
    $cacheability = CacheableMetadata::createFromRenderArray($build)
      ->addCacheableDependency($this);
    $contexts = $this
      ->getContexts();
    foreach ($this
      ->getRegionAssignments() as $region => $blocks) {
      if (!$blocks) {
        continue;
      }
      $region_name = Html::getClass("block-region-{$region}");
      $build[$region]['#prefix'] = '<div class="' . $region_name . '">';
      $build[$region]['#suffix'] = '</div>';

      /** @var \Drupal\Core\Block\BlockPluginInterface[] $blocks */
      $weight = 0;
      foreach ($blocks as $block_id => $block) {
        if ($block instanceof ContextAwarePluginInterface) {
          $this
            ->contextHandler()
            ->applyContextMapping($block, $contexts);
        }
        $access = $block
          ->access($this->account, TRUE);
        $cacheability
          ->addCacheableDependency($access);
        if (!$access
          ->isAllowed()) {
          continue;
        }
        $block_build = [
          '#theme' => 'block',
          '#attributes' => [],
          '#weight' => $weight++,
          '#configuration' => $block
            ->getConfiguration(),
          '#plugin_id' => $block
            ->getPluginId(),
          '#base_plugin_id' => $block
            ->getBaseId(),
          '#derivative_plugin_id' => $block
            ->getDerivativeId(),
          '#block_plugin' => $block,
          '#pre_render' => [
            [
              $this,
              'buildBlock',
            ],
          ],
          '#cache' => [
            'keys' => [
              'page_manager_block_display',
              $this
                ->id(),
              'block',
              $block_id,
            ],
            // Each block needs cache tags of the page and the block plugin, as
            // only the page is a config entity that will trigger cache tag
            // invalidations in case of block configuration changes.
            'tags' => Cache::mergeTags($this
              ->getCacheTags(), $block
              ->getCacheTags()),
            'contexts' => $block
              ->getCacheContexts(),
            'max-age' => $block
              ->getCacheMaxAge(),
          ],
        ];

        // Merge the cacheability metadata of blocks into the page. This helps
        // to avoid cache redirects if the blocks have more cache contexts than
        // the page, which the page must respect as well.
        $cacheability
          ->addCacheableDependency($block);

        // If an alter hook wants to modify the block contents, it can append
        // another #pre_render hook.
        $this->moduleHandler
          ->alter([
          'block_view',
          'block_view_' . $block
            ->getBaseId(),
        ], $block_build, $block);
        $build[$region][$block_id] = $block_build;
      }
    }
    $build['#title'] = $this
      ->renderPageTitle($this->configuration['page_title']);
    $cacheability
      ->applyTo($build);
    return $build;
  }

  /**
   * #pre_render callback for building a block.
   *
   * Renders the content using the provided block plugin, if there is no
   * content, aborts rendering, and makes sure the block won't be rendered.
   */
  public function buildBlock($build) {
    $content = $build['#block_plugin']
      ->build();

    // Remove the block plugin from the render array.
    unset($build['#block_plugin']);
    if ($content !== NULL && !Element::isEmpty($content)) {
      $build['content'] = $content;

      // Add contextual links but prevent duplicating the Views block displays
      // contextual links.
      $add_contextual_links = !empty($content['#contextual_links']) && empty($content['#views_contextual_links']);
      $build['#contextual_links'] = $add_contextual_links ? $content['#contextual_links'] : [];
    }
    else {

      // Abort rendering: render as the empty string and ensure this block is
      // render cached, so we can avoid the work of having to repeatedly
      // determine whether the block is empty. E.g. modifying or adding entities
      // could cause the block to no longer be empty.
      $build = [
        '#markup' => '',
        '#cache' => $build['#cache'],
      ];
    }

    // If $content is not empty, then it contains cacheability metadata, and
    // we must merge it with the existing cacheability metadata. This allows
    // blocks to be empty, yet still bubble cacheability metadata, to indicate
    // why they are empty.
    if (!empty($content)) {
      CacheableMetadata::createFromRenderArray($build)
        ->merge(CacheableMetadata::createFromRenderArray($content))
        ->applyTo($build);
    }
    return $build;
  }

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

    // Don't call VariantBase::buildConfigurationForm() on purpose, because it
    // adds a 'Label' field that we don't actually want to use - we store the
    // label on the page variant entity.
    // $form = parent::buildConfigurationForm($form, $form_state);
    // Allow to configure the page title, even when adding a new display.
    // Default to the page label in that case.
    $form['page_title'] = [
      '#type' => 'textfield',
      '#title' => $this
        ->t('Page title'),
      '#description' => $this
        ->t('Configure the page title that will be used for this display.'),
      '#default_value' => $this->configuration['page_title'] ?: '',
    ];
    $form['uuid'] = [
      '#type' => 'value',
      '#value' => $this->configuration['uuid'] ?: $this->uuidGenerator
        ->generate(),
    ];
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
    parent::submitConfigurationForm($form, $form_state);
    if ($form_state
      ->hasValue('page_title')) {
      $this->configuration['page_title'] = $form_state
        ->getValue('page_title');
    }
    if ($form_state
      ->hasValue('uuid')) {
      $this->configuration['uuid'] = $form_state
        ->getValue('uuid');
    }
  }

  /**
   * {@inheritdoc}
   */
  public function getWizardOperations($cached_values) {
    return [
      'content' => [
        'title' => $this
          ->t('Content'),
        'form' => VariantPluginContentForm::class,
      ],
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return parent::defaultConfiguration() + [
      'page_title' => '',
    ];
  }

  /**
   * Renders the page title and replaces tokens.
   *
   * @param string $page_title
   *   The page title that should be rendered.
   *
   * @return string
   *   The page title after replacing any tokens.
   */
  protected function renderPageTitle($page_title) {
    $data = $this
      ->getContextAsTokenData();

    // Token replace only escapes replacement values, ensure a consistent
    // behavior by also escaping the input and then returning it as a Markup
    // object to avoid double escaping.
    // @todo: Simplify this when core provides an API for this in
    //   https://www.drupal.org/node/2580723.
    $title = (string) $this->token
      ->replace(new HtmlEscapedText($page_title), $data);
    return Markup::create($title);
  }

  /**
   * Returns available context as token data.
   *
   * @return array
   *   An array with token data values keyed by token type.
   */
  protected function getContextAsTokenData() {
    $data = [];
    foreach ($this
      ->getContexts() as $context) {

      // @todo Simplify this when token and typed data types are unified in
      //   https://drupal.org/node/2163027.
      if (strpos($context
        ->getContextDefinition()
        ->getDataType(), 'entity:') === 0) {
        $token_type = substr($context
          ->getContextDefinition()
          ->getDataType(), 7);
        if ($token_type == 'taxonomy_term') {
          $token_type = 'term';
        }
        $data[$token_type] = $context
          ->getContextValue();
      }
    }
    return $data;
  }

  /**
   * {@inheritdoc}
   */
  public function getRegionNames() {
    return [
      'top' => 'Top',
      'bottom' => 'Bottom',
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function __sleep() {
    $vars = parent::__sleep();

    // Gathered contexts objects should not be serialized.
    if (($key = array_search('contexts', $vars)) !== FALSE) {
      unset($vars[$key]);
    }
    return $vars;
  }

}

Classes

Name	Description
PageBlockDisplayVariant	Provides a variant plugin that simply contains blocks.