multisite_block_carousel.module

<?php

/**
 * @file
 * Module file for multisite_block_carousel.
 */

/**
 * Implements hook_menu().
 */
function multisite_block_carousel_menu() {
  if (module_exists('block')) {
    // Add the link in block admin, for default theme.
    $items['admin/structure/block/add-block-carousel-block'] = array(
      'title' => 'Add carousel block',
      'page callback' => 'drupal_get_form',
      'page arguments' => array('multisite_block_carousel_add_block_form'),
      'access arguments' => array('administer blocks'),
      'type' => MENU_LOCAL_ACTION,
    );

    // Add the link in block admin, for every other theme.
    // This has to be done in two steps or it won't work for default theme.
    $default_theme = variable_get('theme_default', 'bartik');
    foreach (list_themes() as $key => $theme) {
      if ($key != $default_theme) {
        $items['admin/structure/block/list/' . $key . '/add-block-arousel-block'] = array(
          'title' => 'Add carousel block',
          'page callback' => 'drupal_get_form',
          'page arguments' => array('multisite_block_carousel_add_block_form'),
          'access arguments' => array('administer blocks'),
          'type' => MENU_LOCAL_ACTION,
        );
      }
    }
    // Manage deletion link.
    $items['admin/structure/block/delete-block-carousel'] = array(
      'page callback' => 'drupal_get_form',
      'page arguments' => array('multisite_block_carousel_delete'),
      'access arguments' => array('administer blocks'),
      'type' => MENU_CALLBACK,
    );
  }
  return $items;
}

/**
 * Menu callback: display the carousel block addition form.
 *
 * @see multisite_block_carousel_add_block_form_submit()
 */
function multisite_block_carousel_add_block_form($form, &$form_state) {
  module_load_include('inc', 'block', 'block.admin');
  $form = block_admin_configure($form, $form_state, 'multisite_block_carousel', NULL);

  // Prevent block_add_block_form_validate/submit() from being automatically
  // added because of the base form ID by providing these handlers manually.
  $form['#validate'] = array();
  $form['#submit'] = array('multisite_block_carousel_add_block_form_submit');

  return $form;
}

/**
 * Submit handler for multisite_block_carousel_add_block_form().
 *
 * Saves the new carousel block.
 *
 * @see multisite_block_carousel_add_block_form()
 */
function multisite_block_carousel_add_block_form_submit($form, &$form_state) {
  // Determine the delta (ID) of the new block.
  $block_ids = variable_get('block_carousel_ids', array());
  $delta = empty($block_ids) ? 1 : max($block_ids) + 1;
  $form_state['values']['delta'] = $delta;

  // Save the new array of blocks IDs.
  $block_ids[] = $delta;
  variable_set('block_carousel_ids', $block_ids);

  // Save the block configuration.
  multisite_block_carousel_block_save($delta, $form_state['values']);

  // Run the new block submission (borrowed from block_add_block_form_submit).
  $query = db_insert('block')->fields(array(
    'visibility',
    'pages',
    'custom',
    'title',
    'module',
    'theme',
    'region',
    'status',
    'weight',
    'delta',
    'cache',
  ));
  foreach (list_themes() as $theme) {
    if ($theme->status) {
      $region = !empty($form_state['values']['regions'][$theme->name]) ? $form_state['values']['regions'][$theme->name] : BLOCK_REGION_NONE;
      $query->values(array(
        'visibility' => (int) $form_state['values']['visibility'],
        'pages' => trim($form_state['values']['pages']),
        'custom' => (int) $form_state['values']['custom'],
        'title' => $form_state['values']['title'],
        'module' => $form_state['values']['module'],
        'theme' => $theme->name,
        'region' => ($region == BLOCK_REGION_NONE ? '' : $region),
        'status' => 0,
        'status' => (int) ($region != BLOCK_REGION_NONE),
        'weight' => 0,
        'delta' => $delta,
        'cache' => DRUPAL_NO_CACHE,
      ));
    }
  }
  $query->execute();

  $query = db_insert('block_role')->fields(array('rid', 'module', 'delta'));
  foreach (array_filter($form_state['values']['roles']) as $rid) {
    $query->values(array(
      'rid' => $rid,
      'module' => $form_state['values']['module'],
      'delta' => $delta,
    ));
  }
  $query->execute();

  drupal_set_message(t('The block has been created.'));
  cache_clear_all();
  $form_state['redirect'] = 'admin/structure/block';
}

/**
 * Implements hook_form_FORM_ID_alter().
 *
 * Alters the block admin form to add delete links next to menu blocks.
 */
function multisite_block_carousel_form_block_admin_display_form_alter(&$form, $form_state) {
  $blocks = module_invoke_all('block_carousel_blocks');
  foreach (variable_get('block_carousel_ids', array()) as $delta) {
    if (empty($blocks[$delta])) {
      $form['blocks']['block_carousel_' . $delta]['delete'] = array(
        '#type' => 'link',
        '#title' => t('delete'),
        '#href' => 'admin/structure/block/delete-block-carousel/' . $delta,
      );
    }
  }
}

/**
 * Form constructor for the carousel blocks delete confirmation form.
 */
function multisite_block_carousel_delete($form, &$form_state, $delta = 0) {
  $form['delta'] = array('#type' => 'hidden', '#value' => $delta);

  return confirm_form($form, t('Are you sure you want to delete the block?'), 'admin/structure/block', NULL, t('Delete'), t('Cancel'));
}

/**
 * Form submission handler for multisite_block_carousel_delete().
 *
 * Deletes the carousel block.
 *
 * @see multisite_block_carousel_delete()
 */
function multisite_block_carousel_delete_submit($form, &$form_state) {
  // Remove the menu block configuration variables.
  $delta = $form_state['values']['delta'];
  $block_ids = variable_get('block_carousel_ids', array());
  unset($block_ids[array_search($delta, $block_ids)]);
  sort($block_ids);
  variable_set('block_carousel_ids', $block_ids);
  variable_del("block_carousel_{$delta}_gid");

  db_delete('block')
    ->condition('module', 'multisite_block_carousel')
    ->condition('delta', $delta)
    ->execute();
  db_delete('block_role')
    ->condition('module', 'multisite_block_carousel')
    ->condition('delta', $delta)
    ->execute();
  drupal_set_message(t('The block has been removed.'));
  cache_clear_all();
  $form_state['redirect'] = 'admin/structure/block';
}

/**
 * Implements hook_block_info().
 */
function multisite_block_carousel_block_info() {
  $blocks = array();
  $deltas = variable_get('block_carousel_ids', array());

  // Load every carousel block.
  foreach (array_keys(module_invoke_all('block_carousel_blocks')) as $delta) {
    $deltas[] = $delta;
  }
  foreach ($deltas as $delta) {
    $blocks[$delta]['info'] = 'Mediagallery carousel block ' . strval($delta);
    $blocks[$delta]['cache'] = DRUPAL_CACHE_PER_ROLE;
  }

  return $blocks;
}

/**
 * Implements hook_block_configure().
 *
 * This hook declares configuration options for blocks provided by this module.
 */
function multisite_block_carousel_block_configure($delta = '') {
  $form = array();
  $deltas = variable_get('block_carousel_ids', array());

  if (in_array($delta, $deltas) || !$delta) {
    if (!$delta) {
      $delta = ($deltas ? max($deltas) + 1 : 1);
    }

    // Get all available galleries.
    $nids = db_select('node', 'n')
      ->fields('n', array('nid', 'title'))
      ->condition('n.type', 'gallerymedia')
      ->execute()
      ->fetchAllKeyed();

    // Create field 'Gallery' with all available galleries.
    $form["block_carousel_{$delta}_gid"] = array(
      '#type' => 'select',
      '#title' => t('Gallery'),
      '#options' => $nids,
      '#description' => t('This gallery content will be displayed in the carousel.'),
      '#default_value' => variable_get("block_carousel_{$delta}_gid", t('empty')),
      '#required' => TRUE,
    );
  }
  return $form;
}

/**
 * Implements hook_block_save().
 *
 * This hook declares how the configured options for a block provided by this
 * module are saved.
 */
function multisite_block_carousel_block_save($delta = '', $edit = array()) {
  $deltas = variable_get('block_carousel_ids', array());

  if (in_array($delta, $deltas)) {
    variable_set("block_carousel_{$delta}_gid", $edit["block_carousel_{$delta}_gid"]);
  }
}

/**
 * Implements hook_block_view().
 *
 * This hook generates the contents of the blocks themselves.
 */
function multisite_block_carousel_block_view($delta = '') {
  $block = array();
  $deltas = variable_get('block_carousel_ids', array());

  if (in_array($delta, $deltas)) {
    $block['subject'] = t('Title of first block (carousel_configurable)');
    $block['content'] = multisite_block_carousel_contents($delta);
  }
  return $block;
}

/**
 * Returns block content.
 *
 * @param string $delta
 *   The block machine name.
 *
 * @return string
 *   The content of the block.
 *
 * @see multisite_block_carousel_block_view()
 */
function multisite_block_carousel_contents($delta) {
  global $base_url;
  $deltas = variable_get('block_carousel_ids', array());

  if (in_array($delta, $deltas)) {
    if (variable_get("block_carousel_{$delta}_gid") == 'empty') {
      return '';
    }

    $gall = node_load(variable_get("block_carousel_{$delta}_gid"));
    $path = $base_url . '/' . (isset($gall->path['alias']) ? $gall->path['alias'] : $gall->path['source']);

    $media_items = array();
    $return = '';
    $first = TRUE;

    // Merge photos and videos.
    if (isset($gall->field_picture_upload[LANGUAGE_NONE]) && isset($gall->field_video_upload[LANGUAGE_NONE])) {
      $media_items = array_merge($gall->field_picture_upload[LANGUAGE_NONE], $gall->field_video_upload[LANGUAGE_NONE]);
    }
    elseif (isset($gall->field_picture_upload[LANGUAGE_NONE])) {
      $media_items = $gall->field_picture_upload[LANGUAGE_NONE];
    }
    elseif (isset($gall->field_video_upload[LANGUAGE_NONE])) {
      $media_items = $gall->field_video_upload[LANGUAGE_NONE];
    }
    // @todo This is unneeded, $media_items is already instantiated to an empty
    //   array.
    else {
      $media_items = array();
    }

    // Sort table.
    $return .= '<div class=" carousel slide" id="block-carousel-' . $gall->nid . '">';

    // Carousel slider.
    $return .= '<ol class="carousel-indicators">';
    foreach ($media_items as $id => $item) {

      $return .= '<li data-target="#block-carousel-' . $gall->nid . '" data-slide-to="' . $id . '" class="' . ($first ? "active" : "") . '"></li>';

      $first = FALSE;
    }

    $return .= '</ol>';

    $first = TRUE;

    // Carousel content.
    $return .= '<div class="carousel-inner">';

    foreach ($media_items as $id => $item) {
      $return .= '<div class="item ' . ($first ? "active" : "") . '">';

      switch ($item['type']) {
        case 'image':
          $thumb = image_style_url('landscape', $item['uri']);
          $return .= '<a href="' . check_plain($path) . '">';
          $return .= '<img src="' . $thumb . '" alt="' . check_plain($item['filename']) . '" />';
          $return .= '<p class="carousel-caption">' . (isset($item['field_picture_description'][LANGUAGE_NONE][0]['safe_value']) ? filter_xss($item['field_picture_description'][LANGUAGE_NONE][0]['safe_value']) : check_plain($item['filename'])) . '</p>';
          $return .= '</a>';
          break;

        case 'video':
          $thumb = image_style_url('landscape', file_load($item['thumbnail'])->uri);
          $return .= '<a href="' . $path . '">';
          $return .= '<img src="' . $thumb . '" alt="' . check_plain($item['filename']) . '" />';
          $return .= '<p class="carousel-caption">' . check_plain($item['filename']) . '</p>';
          $return .= '</a>';
          break;

        default:
          break;
      }

      $return .= '</div>';

      $first = FALSE;
    }

    $return .= '</div>';

    $return .= '<a class="carousel-control left" href="#block-carousel-' . $gall->nid . '" data-slide="prev"><span class="glyphicon glyphicon-chevron-left"></span></a>';
    $return .= '<a class="carousel-control right" href="#block-carousel-' . $gall->nid . '" data-slide="next"><span class="glyphicon glyphicon-chevron-right"></span></a>';
    $return .= '</div>';

    return array('#markup' => $return);
  }
}