<?php
/**
 * Callback function to supply a list of content types.
 */
function panels_node_links_panels_content_types() {
  $items['node_links'] = array(
    'title' => t('Node links'),
    'single' => TRUE, // only provides a single content type
    'content_types' => 'panels_admin_content_types_node_links',
    'render callback' => 'panels_content_node_links',
//      'add callback' => 'panels_admin_edit_node_links',
//      'edit callback' => 'panels_admin_edit_node_links',
    'title callback' => 'panels_admin_title_node_links',
  );
  return $items;
}

/**
 * Fetch the node's links
 */
function panels_admin_node_links($node, $conf) { 

  $node->links = module_invoke_all('link', 'node', $node, $teaser);

  foreach (module_implements('link_alter') AS $module) {
    $function = $module .'_link_alter';
    $function($node, $node->links);
  }
}

/**
 * Output function for the 'node' content type. Outputs a node
 * based on the module and delta supplied in the configuration.
 */
function panels_content_node_links($conf, $panel_args, $context) {
  $node = isset($context->data) ? drupal_clone($context->data) : NULL;
  $block->module = 'node';

  $block->subject = t('Node links');
  if ($node) {
    $block->content = panels_admin_node_links($node, $conf);
    $block->delta = $node->nid;
  }
  else {
    $block->content = t('Node links go here.');
    $block->delta = 'unknown';
  }

  return $block;
}

/**
 * Return all content types available.
 */
function panels_admin_content_types_node_links() {
  return array(
    'node_type' => array(
      'title' => t('Node links'),
      'icon' => 'icon_node.png',
      'path' => panels_get_path('content_types/node'),
      'description' => t('The links rendered on a node.'),
      'required context' => new panels_required_context(t('Node'), 'node'),
      'category' => array(t('Node context'), -9),
    ),
  );
}

function panels_admin_title_node_links($conf, $context) {
  return t('"@s" links', array('@s' => $context->identifier));
}