book_parent.inc

<?php


/**
 * @file
 * Plugin to provide an relationship handler for book parent.
 */

/**
 * Plugins are described by creating a $plugin array which will be used
 * by the system that includes this file.
 */
$plugin = array(
    'title' => t('Book parent'),
    'keyword' => 'book_parent',
    'description' => t('Adds a book parent from a node context.'),
    'required context' => new ctools_context_required(t('Node'), 'node'),
    'context' => 'ctools_book_parent_context',
    'edit form' => 'ctools_book_parent_settings_form',
    'defaults' => array(
        'type' => 'top',
    ),
);

/**
 * Return a new context based on an existing context.
 */
function ctools_book_parent_context($context, $conf) {
    // If unset it wants a generic, unfilled context, which is just NULL.
    if (empty($context->data)) {
        return ctools_context_create_empty('node');
    }
    if (isset($context->data->book)) {
        if ($conf['type'] == 'top') {
            $nid = $context->data->book['bid'];
        }
        else {
            // Just load the parent book.
            $item = book_link_load($context->data->book['plid']);
            $nid = $item['nid'];
        }
        if (!empty($nid)) {
            // Load the node.
            $node = node_load($nid);
            // Generate the context.
            if (node_access('view', $node)) {
                return ctools_context_create('node', $node);
            }
        }
    }
    else {
        return ctools_context_create_empty('node');
    }
}

/**
 * Settings form for the relationship.
 */
function ctools_book_parent_settings_form($form, &$form_state) {
    $conf = $form_state['conf'];
    $form['type'] = array(
        '#type' => 'select',
        '#title' => t('Relationship type'),
        '#options' => array(
            'parent' => t('Immediate parent'),
            'top' => t('Top level book'),
        ),
        '#default_value' => $conf['type'],
    );
    return $form;
}