Club Drupal

<?php

if (module_exists('book')) {

  /**

   * Plugins are described by creating a $plugin array which will be used

   * by the system that includes this file.

   */

  $plugin = array(

    'single' => TRUE,

    'title' => t('Book navigation pager'),

    'icon' => '../block/icon_core_booknavigation.png',

    'description' => t('The navigational pager and sub pages of the current book node.'),

    'required context' => new ctools_context_required(t('Node'), 'node'),

    'category' => t('Node'),

  );

}

function ctools_node_book_nav_content_type_render($subtype, $conf, $panel_args, $context) {

  $node = isset($context->data) ? clone $context->data : NULL;

  $block = new stdClass();

  $block->module = 'book_nav';

  $block->title = t('Book navigation pager');

  if ($node) {

    $block->content = isset($node->book) ? theme('book_navigation', array('book_link' => $node->book)) : '';

    $block->delta = $node->nid;

  }

  else {

    $block->content = t('Book navigation pager goes here.');

    $block->delta = 'unknown';

  }

  return $block;

}

function ctools_node_book_nav_content_type_admin_title($subtype, $conf, $context) {

  return t('"@s" book navigation pager', array('@s' => $context->identifier));

}

function ctools_node_book_nav_content_type_edit_form($form, &$form_state) {

  // provide a blank form so we have a place to have context setting.

  return $form;

}