menu_firstchild.module in Menu Firstchild 8

Contains menu_firstchild.module.

File

menu_firstchild.module

<?php

/**
 * @file
 * Contains menu_firstchild.module.
 */
use Drupal\Core\Ajax\AjaxResponse;
use Drupal\Core\Ajax\HtmlCommand;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\menu_firstchild\MenuItemParser;

/**
 * Implements hook_help().
 */
function menu_firstchild_help($route_name, RouteMatchInterface $route_match) {
  if ($route_name == 'help.page.menu_firstchild') {
    $output = '<h3>' . t('About') . '</h3>';
    $output .= '<p>' . t('Allows to create parent menu items without path that link to their first viewable children.') . '</p>';
    return $output;
  }
}

/**
 * Implements hook_form_BASE_FORM_ID_alter().
 */
function menu_firstchild_form_menu_link_content_form_alter(array &$form, FormStateInterface $form_state) {
  $link = $form_state
    ->getFormObject()
    ->getEntity();
  $options = $link->link
    ->first()->options;
  if (empty($options['menu_firstchild'])) {
    $options['menu_firstchild'] = [
      'enabled' => FALSE,
    ];
  }
  $form['link']['#prefix'] = '<div id="menu-firstchild-link-wrapper">';
  $form['link']['#suffix'] = '</div>';
  $form['link']['widget']['#disabled'] = !empty($options['menu_firstchild']['enabled']);
  $form['menu_firstchild_enabled'] = [
    '#type' => 'checkbox',
    '#title' => t('First child'),
    '#description' => t('When enabled, this menu item will redirect to the first child item.'),
    '#default_value' => $options['menu_firstchild']['enabled'],
    '#ajax' => [
      'callback' => 'menu_firstchild_menu_link_content_form_ajax_callback',
    ],
    '#weight' => $form['link']['#weight'] + 1,
  ];
  $ajax = $form_state
    ->getValue([
    'menu_firstchild_enabled',
  ]) !== NULL;
  if ($ajax) {
    if ($form_state
      ->getValue([
      'menu_firstchild_enabled',
    ])) {
      $form['link']['widget'][0]['uri']['#value'] = 'route:<none>';
      $form['link']['widget']['#disabled'] = TRUE;
    }
    else {
      $form['link']['widget'][0]['uri']['#default_value'] = '';
      $form['link']['widget']['#disabled'] = FALSE;
    }
  }
  $form['actions']['submit']['#submit'][] = 'menu_firstchild_menu_link_content_form_submit';
}

/**
 * AJAX callback.
 *
 * @param array $form
 *   Form array.
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 *   Form state.
 *
 * @return \Drupal\Core\Ajax\AjaxResponse
 *   AJAX callback response.
 */
function menu_firstchild_menu_link_content_form_ajax_callback(array &$form, FormStateInterface $form_state) {
  $replace_link = new HtmlCommand('#menu-firstchild-link-wrapper', $form['link']);
  $response = new AjaxResponse();
  $response
    ->addCommand($replace_link);
  return $response;
}

/**
 * Form submit callback.
 */
function menu_firstchild_menu_link_content_form_submit($form, FormStateInterface $form_state) {
  $value = [
    'menu_firstchild' => [
      'enabled' => $form_state
        ->getValue('menu_firstchild_enabled'),
    ],
  ];
  $link = $form_state
    ->getFormObject()
    ->getEntity();
  $options = $link->link
    ->first()->options;
  $link->link
    ->first()->options = array_merge($options, $value);
  $link
    ->save();
}

/**
 * Implements hook_preprocess_menu().
 *
 * Parses all menu items.
 */
function menu_firstchild_preprocess_menu(&$variables) {
  $parser = new MenuItemParser();
  foreach ($variables['items'] as &$item) {
    $item = $parser
      ->parse($item, $variables['menu_name']);
  }
}

Functions

Name	Description
menu_firstchild_form_menu_link_content_form_alter	Implements hook_form_BASE_FORM_ID_alter().
menu_firstchild_help	Implements hook_help().
menu_firstchild_menu_link_content_form_ajax_callback	AJAX callback.
menu_firstchild_menu_link_content_form_submit	Form submit callback.
menu_firstchild_preprocess_menu	Implements hook_preprocess_menu().