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   1  <?php
   2  // $Id: book_parent.inc,v 1.2.2.3 2010/07/20 21:57:27 merlinofchaos Exp $
   3  
   4  /**
   5   * @file
   6   * Plugin to provide an relationship handler for book parent.
   7   */
   8  
   9  /**
  10   * Plugins are described by creating a $plugin array which will be used
  11   * by the system that includes this file.
  12   */
  13  $plugin = array(
  14    'title' => t('Book parent'),
  15    'keyword' => 'book_parent',
  16    'description' => t('Adds a book parent from a node context.'),
  17    'required context' => new ctools_context_required(t('Node'), 'node'),
  18    'context' => 'ctools_book_parent_context',
  19    'settings form' => 'ctools_book_parent_settings_form',
  20    'settings form validate' => 'ctools_book_parent_settings_form_validate',
  21    'defaults' => array('type' => 'top'),
  22  );
  23  
  24  /**
  25   * Return a new context based on an existing context.
  26   */
  27  function ctools_book_parent_context($context, $conf) {
  28    // If unset it wants a generic, unfilled context, which is just NULL.
  29    if (empty($context->data)) {
  30      return ctools_context_create_empty('node');
  31    }
  32  
  33    if (isset($context->data->book)) {
  34      if ($conf['type'] == 'top') {
  35        $nid = $context->data->book['bid'];
  36      }
  37      else {
  38        // Just load the parent book.
  39        $item = book_link_load($context->data->book['plid']);
  40        $nid = $item['nid'];
  41      }
  42  
  43      if (!empty($nid)) {
  44        // Load the node.
  45        $node = node_load($nid);
  46        // Generate the context.
  47        return ctools_context_create('node', $node);
  48      }
  49    }
  50  }
  51  
  52  /**
  53   * Settings form for the relationship.
  54   */
  55  function ctools_book_parent_settings_form($conf) {
  56    $form['type'] = array(
  57      '#type' => 'select',
  58      '#title' => t('Relationship type'),
  59      '#options' => array('parent' => t('Immediate parent'), 'top' => t('Top level book')),
  60      '#default_value' => $conf['type'],
  61    );
  62  
  63    return $form;
  64  }