easyopac_second_menu.install

<?php

/**
 * @file
 * Installs the second tier menu.
 */

/**
 * Describe custom menu properties.
 *
 * @return array
 *   New menu array.
 */
function _easyopac_second_menu_menu_describer() {
  return [
    'menu_name' => 'second_tier_menu',
    'title' => 'Second Tier Menu',
  ];
}

/**
 * Get panels everywhere page "did" identifier.
 *
 * @return string
 *   Returns "did" display identifier.
 */
function _easyopac_second_menu_get_did() {
  $query = db_select('page_manager_handlers', 'pmh')
    ->fields('pmh', ['conf'])
    ->condition('pmh.name', 'site_template_panel_context');
  $result = $query->execute()->fetchColumn();
  $conf = unserialize($result);

  return $conf['did'];
}

/**
 * Implements hook_install().
 */
function easyopac_second_menu_install() {
  $t = get_t();

  // Create secondary tier menu.
  $menu = _easyopac_second_menu_menu_describer();
  menu_save($menu);
  cache_clear_all();

  // Create new pane wrapper.
  $new_pane = panels_new_pane('block', 'menu-second_tier_menu', TRUE);

  if ($new_pane) {
    // Set pane's configuration.
    $new_pane->configuration['override_title'] = TRUE;
    $new_pane->configuration['override_title_text'] = '';
    $new_pane->configuration['override_title_heading'] = 'h2';

    $did = _easyopac_second_menu_get_did();

    if (is_numeric($did)) {
      // Load full display of site template to add new pane.
      /** @var \panels_display $display */
      $display = panels_load_display($did);
      if ($display) {
        $display->add_pane($new_pane, 'second_menu_tier');
        panels_save_display($display);
      }
    }
    else {
      drupal_set_message($t('Incorrect reference to panels display'), 'warning', FALSE);
      watchdog('easyopac_second_menu', 'Identifier "did" passed to panels_load_display is not int - @did.', ['@did' => $did]);
    }
  }
  else {
    drupal_set_message($t('Failed to create new pane.'), 'warning', FALSE);
  }
}

/**
 * Implements hook_uninstall().
 */
function easyopac_second_menu_uninstall() {
  menu_delete(_easyopac_second_menu_menu_describer());
  cache_clear_all();

  $did = _easyopac_second_menu_get_did();
  /** @var \panels_display $display */
  $display = panels_load_display($did);
  $panels = $display->panels['second_menu_tier'];

  foreach ($panels as $panel) {
    unset($display->content[$panel]);
  }

  unset($display->panels['second_menu_tier']);
  panels_save_display($display);
}