dr821/dr821.theme

<?php

/**
 * Implements hook_block_view_alter().
 *
 * Convert blocks within the footer region to Bootstrap panels.
 *
 * @param array $build
 *   The block view render array to alter.
 *
 * @see dr821m_block_view_alter()
 */
function _dr821_block_view_alter(array &$build) {
  /** @var \Drupal\block\Entity\Block $blockEntity */
  $blockEntity = $build['#block'];
  $region = $blockEntity->getRegion();
  if ($region !== 'footer') {
    return;
  }
  // Request wrapping the block title and content in appropriate classes.
  $build['#pre_render'][] = '_dr821_prerender_block';

  // Wrap the overall block in panel classes.
  if (!isset($build['#attributes']['class'])) {
    $build['#attributes']['class'] = [];
  }
  $build['#dr821_panelize_title_va'] = TRUE;
  $build['#attributes']['class'] += ['panel', 'panel-default', 'col-xs-6'];
}

/**
 * Pre-render function to request wrapping of block parts.
 *
 * @param array $block
 *
 * @return mixed
 */
function _dr821_prerender_block($block) {
  // Wrap the block body in a panel-body container div.
  if (!empty($block['content'])) {
    $block['content']['#theme_wrappers'] = [
      'container' => [
        '#attributes' => [
          'class' => ['panel-body'],
        ],
      ],
    ];
  }
  // Tell the preprocess function to wrap the block title as a panel heading
  $block['#dr821_panelize_title'] = TRUE;
  return $block;
}

/**
 * Wrap the block title as a panel heading with title.
 *
 * @param array $elements
 */
function _dr821_panelize_block_title(&$elements) {
  // Do not just assign prefix/suffix: it would lose contextual information.
  $elements['title_prefix']['#markup'] = '<div class="panel-heading">';
  $elements['title_suffix']['#markup'] = '</div>';
  $elements['title_attributes']['class'][] = 'panel-title';
}

/**
 * Implements hook_preprocess_block().
 *
 * Wrap the block title as a panel heading if required.
 */
function dr821_preprocess_block(&$elements, $hook, $info) {
  if ($elements['elements']['#dr821_panelize_title']) {
    _dr821_panelize_block_title($elements);
  }
}