<?php
// $Id: tabs.module,v 1.15 2009-08-19 14:19:34 nedjo Exp $

/**
 * @file
 * API for creating tabbed pages.
 *
 * See the file tabsexample.module, included in the dev release, for usage examples.
 */

/**
 * Implementation of hook_menu().
 */
function tabs_menu() {
  $items = array();

  $items['admin/settings/tabs'] = array(
    'title' => 'Tabs',
    'description' => 'Configuration for tabs',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('tabs_admin_settings'),
    'access arguments' => array('administer site configuration'),
    'file' => 'tabs.admin.inc',
  );

  return $items;
}

/**
 * Implementation of hook_theme()
 */
function tabs_theme() {
  return array(
    'tabset' => array(
      'arguments' => array('element' => NULL),
      'file' => 'tabs.theme.inc',
    ),
    'tabpage' => array(
      'arguments' => array('element' => NULL),
      'file' => 'tabs.theme.inc',
    ),
  );
}

/**
 * Process a tabset prior to rendering.
 */
function tabs_pre_render_tabset($element) {
  tabs_load();
  // Assign a name, reading from the first parent (the key of this tabset element).
  $name = $element['#tabset_name'] = form_clean_id(isset($element['#tabset_name']) && $element['#tabset_name'] ? $element['#tabset_name'] : (isset($element['#parents']) && count($element['#parents']) ? $element['#parents'][0] : 'tabset'));

  // Add class.
  if (!isset($element['#attributes'])) {
    $element['#attributes'] = array();
  }
  $element['#attributes']['class'] = (isset($element['#attributes']['class']) ? $element['#attributes']['class'] .' ' : '') .'drupal-tabs js-hide'. (isset($element['#tabs_navigation']) && $element['#tabs_navigation'] ? ' tabs-navigation' : '');

  $children = element_children($element);

  $num_items = count($children);
  foreach ($children as $index => $key) {
    if (isset($element[$key]['#type']) && $element[$key]['#type'] == 'tabpage') {
      if (!isset($element[$key]['#content'])) {
        $element[$key]['#content'] = '';
      }
      $is_ajax = isset($element[$key]['#ajax_url']) && $element[$key]['#ajax_url'];
      // Unset any empty tabs.
      $content = trim($element[$key]['#content']);
      if (!$is_ajax && empty($content) && !element_children($element[$key])) {
        unset($element[$key]);
        continue;
      }
      // Display any #description before the #content.
      $element[$key]['#content'] = (isset($element[$key]['#description']) && $element[$key]['#description'] ? '<div class="description">'. $element[$key]['#description'] .'</div>' : '') . $element[$key]['#content'];
      $element[$key]['#tabset_name'] = $element['#tabset_name'];
      $element[$key]['#title'] = check_plain($element[$key]['#title']);
      // If not explicitly set, construct a tab name from the title.
      if (empty($element[$key]['#tab_name'])) {
        $element[$key]['#tab_name'] = form_clean_id('tabs-' . strtolower($element[$key]['#title']));
      }
      if (!isset($element[$key]['#attributes'])) {
        $element[$key]['#attributes'] = array();
      }
      // If we are loading via AJAX we need to add a title attribute and set the url to the AJAX path.
      if ($is_ajax) {
        $element[$key]['#attributes']['#title'] =  $element[$key]['#tab_name'];
        $element[$key]['#url'] = $element[$key]['#ajax_url'];
      }
      // Otherwise we use a hash.
      else {
        $element[$key]['#url'] = '#' .  $element[$key]['#tab_name'];
      }
      $element[$key]['#attributes']['class'] = (isset($element[$key]['#attributes']['class']) ? $element[$key]['#attributes']['class'] .' ' : '') . $element[$key]['#tab_name'];
      // Add the active class if this tab is selected.
      if (isset($element[$key]['#selected']) && $element[$key]['#selected']) {
        $element[$key]['#attributes']['class'] .= ' active';
      }
      // Add a class to the first and last tabs.
      if ($index == 0) {
        $element[$key]['#attributes']['class'] .= ' first';
      }
      if ($index + 1 == $num_items) {
        $element[$key]['#attributes']['class'] .= ' last';
      }
      $element[$key]['#index'] = $index;
    }
  }
  return $element;
}

/**
 * Add required js and css files.
 */
function tabs_load() {
  static $loaded = FALSE;

  if (!$loaded) {
    $tabs_speed = variable_get('tabs_speed', 'slow');
    if (is_numeric($tabs_speed)) {
      $tabs_speed = (int) $tabs_speed;
    }
    $path = drupal_get_path('module', 'tabs');
    // TODO: make this a dependency in D7.
    if (module_exists('jquery_ui')) {
      jquery_ui_add(array('ui.tabs'));
    }
    else {
      drupal_add_js($path . '/ui.core.js');
      drupal_add_js($path . '/ui.tabs.js');
    }

    drupal_add_js($path . '/tabs.js');
    drupal_add_js(array('tabs' => array('slide' => (bool) variable_get('tabs_slide', 0), 'fade' => (bool) variable_get('tabs_fade', 0), 'speed' => $tabs_speed, 'auto_height' => (bool) variable_get('tabs_auto_height', 0), 'next_text' => variable_get('tabs_nav_next', t('next')), 'previous_text' => variable_get('tabs_nav_prev', t('previous')))), 'setting');
    drupal_add_css($path . '/drupal-tabs.css');
    $loaded = TRUE;
  }
}

/**
 * Render a tabset 'manually' (when not rendering as part of a regular form render).
 */
function tabs_render($form) {
  $form_state = array();
  return drupal_render(form_builder('tabset', $form, $form_state));
}

/**
 * Implementation of hook_elements().
 */
function tabs_elements() {
  $type = array();
  $type['tabset'] = array('#tabs_navigation' => variable_get('tabs_navigation', 0) ? TRUE : FALSE, '#pre_render' => array('tabs_pre_render_tabset'));
  $type['tabpage'] = array('#content' => '');
  return $type;
}