BlockListBuilder::buildBlocksForm

protected BlockListBuilder::buildBlocksForm()

protected function buildBlocksForm() {
  // Build blocks first for each region.
  $blocks = [];
  $entities = $this->load();
  /** @var \Drupal\block\BlockInterface[] $entities */
  foreach ($entities as $entity_id => $entity) {
    $definition = $entity->getPlugin()->getPluginDefinition();
    $blocks[$entity->getRegion()][$entity_id] = array(
      'label' => $entity->label(),
      'entity_id' => $entity_id,
      'weight' => $entity->getWeight(),
      'entity' => $entity,
      'category' => $definition['category'],
    );
  }

  $form = array(
    '#type' => 'table',
    '#header' => array(
      $this->t('Block'),
      $this->t('Category'),
      $this->t('Region'),
      $this->t('Weight'),
      $this->t('Operations'),
    ),
    '#attributes' => array(
      'id' => 'blocks',
    ),
  );

  // Weights range from -delta to +delta, so delta should be at least half
  // of the amount of blocks present. This makes sure all blocks in the same
  // region get an unique weight.
  $weight_delta = round(count($entities) / 2);

  $placement = FALSE;
  if ($this->request->query->has('block-placement')) {
    $placement = $this->request->query->get('block-placement');
    $form['#attached']['drupalSettings']['blockPlacement'] = $placement;
  }

  // Loop over each region and build blocks.
  $regions = $this->systemRegionList($this->getThemeName(), REGIONS_VISIBLE);
  $block_regions_with_disabled = $regions + array(BlockInterface::BLOCK_REGION_NONE => $this->t('Disabled', array(), array('context' => 'Plural')));
  foreach ($block_regions_with_disabled as $region => $title) {
    $form['#tabledrag'][] = array(
      'action' => 'match',
      'relationship' => 'sibling',
      'group' => 'block-region-select',
      'subgroup' => 'block-region-' . $region,
      'hidden' => FALSE,
    );
    $form['#tabledrag'][] = array(
      'action' => 'order',
      'relationship' => 'sibling',
      'group' => 'block-weight',
      'subgroup' => 'block-weight-' . $region,
    );

    $form['region-' . $region] = array(
      '#attributes' => array(
        'class' => array('region-title', 'region-title-' . $region),
        'no_striping' => TRUE,
      ),
    );
    $form['region-' . $region]['title'] = array(
      '#theme_wrappers' => array(
        'container' => array(
          '#attributes' => array('class' => 'region-title__action'),
        )
      ),
      '#prefix' => $region != BlockInterface::BLOCK_REGION_NONE ? $title : $block_regions_with_disabled[$region],
      '#type' => 'link',
      '#title' => $this->t('Place block <span class="visually-hidden">in the %region region</span>', ['%region' => $block_regions_with_disabled[$region]]),
      '#url' => Url::fromRoute('block.admin_library', ['theme' => $this->getThemeName()], ['query' => ['region' => $region]]),
      '#wrapper_attributes' => array(
        'colspan' => 5,
      ),
      '#attributes' => [
        'class' => ['use-ajax', 'button', 'button--small'],
        'data-dialog-type' => 'modal',
        'data-dialog-options' => Json::encode([
          'width' => 700,
        ]),
      ],
    );

    $form['region-' . $region . '-message'] = array(
      '#attributes' => array(
        'class' => array(
          'region-message',
          'region-' . $region . '-message',
          empty($blocks[$region]) ? 'region-empty' : 'region-populated',
        ),
      ),
    );
    $form['region-' . $region . '-message']['message'] = array(
      '#markup' => '<em>' . $this->t('No blocks in this region') . '</em>',
      '#wrapper_attributes' => array(
        'colspan' => 5,
      ),
    );

    if (isset($blocks[$region])) {
      foreach ($blocks[$region] as $info) {
        $entity_id = $info['entity_id'];

        $form[$entity_id] = array(
          '#attributes' => array(
            'class' => array('draggable'),
          ),
        );
        if ($placement && $placement == Html::getClass($entity_id)) {
          $form[$entity_id]['#attributes']['class'][] = 'color-success';
          $form[$entity_id]['#attributes']['class'][] = 'js-block-placed';
        }
        $form[$entity_id]['info'] = array(
          '#plain_text' => $info['label'],
          '#wrapper_attributes' => array(
            'class' => array('block'),
          ),
        );
        $form[$entity_id]['type'] = array(
          '#markup' => $info['category'],
        );
        $form[$entity_id]['region-theme']['region'] = array(
          '#type' => 'select',
          '#default_value' => $region,
          '#empty_value' => BlockInterface::BLOCK_REGION_NONE,
          '#title' => $this->t('Region for @block block', array('@block' => $info['label'])),
          '#title_display' => 'invisible',
          '#options' => $regions,
          '#attributes' => array(
            'class' => array('block-region-select', 'block-region-' . $region),
          ),
          '#parents' => array('blocks', $entity_id, 'region'),
        );
        $form[$entity_id]['region-theme']['theme'] = array(
          '#type' => 'hidden',
          '#value' => $this->getThemeName(),
          '#parents' => array('blocks', $entity_id, 'theme'),
        );
        $form[$entity_id]['weight'] = array(
          '#type' => 'weight',
          '#default_value' => $info['weight'],
          '#delta' => $weight_delta,
          '#title' => $this->t('Weight for @block block', array('@block' => $info['label'])),
          '#title_display' => 'invisible',
          '#attributes' => array(
            'class' => array('block-weight', 'block-weight-' . $region),
          ),
        );
        $form[$entity_id]['operations'] = $this->buildOperations($info['entity']);
      }
    }
  }

  // Do not allow disabling the main system content block when it is present.
  if (isset($form['system_main']['region'])) {
    $form['system_main']['region']['#required'] = TRUE;
  }
  return $form;
}