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<?php
/**
* Plugin Name: Per Post Nav Menu
* Plugin URI: http://wordpress.stackexchange.com/q/85243/6035
* Description: Change nav menu based on theme location and a per-post selection.
* Version: 1.0
* Text Domain: wpse
* Author: Christopher Davis
* Author URI: http://christopherdavis.me
* License: GPL-2.0+
*
* Copyright 2013 Christopher Davis <http://christopherdavis.me>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* @category WordPress
* @author Christopher Davis <http://christopherdavis.me>
* @copyright 2013 Christopher Davis
* @license http://opensource.org/licenses/GPL-2.0 GPL-2.0+
*/
!defined('ABSPATH') && exit;
PerPostNavMenu::init();
class PerPostNavMenu
{
const NONCE = 'wpse85243_nav_nonce';
const FIELD = '_wpse85243_per_post_menu';
const LOC = 'primary'; // the location for twenty twelve
private static $ins = null;
public static function instance()
{
if (is_null(self::$ins)) {
self::$ins = new self;
}
return self::$ins;
}
public static function init()
{
add_action('plugins_loaded', array(self::instance(), '_setup'));
}
public function _setup()
{
add_action('add_meta_boxes', array($this, 'addBox'));
add_action('save_post', array($this, 'save'), 10, 2);
add_filter('wp_nav_menu_args', array($this, 'switchMenu'));
}
public function addBox($post_type)
{
if (!post_type_exists($post_type)) {
return;
}
add_meta_box(
'wpse85243_nav_menu',
__('Nav Menu', 'wpse'),
array($this, 'boxCallback'),
$post_type,
'side',
'low'
);
}
public function boxCallback($post)
{
$menu = get_post_meta($post->ID, static::FIELD, true);
wp_nonce_field(static::NONCE . $post->ID, static::NONCE, false);
printf(
'<label for="%s">%s</label>',
esc_attr(static::FIELD),
esc_html__('Nav Menu', 'wpse')
);
echo '<br />';
printf('<select name="%1$s" id="%1$s">', esc_attr(static::FIELD));
foreach ($this->getNavMenus() as $id => $name) {
printf(
'<option value="%s" %s>%s</option>',
esc_attr($id),
selected($menu, $id, false),
esc_html($name)
);
}
echo '</select>';
}
public function save($post_id, $post)
{
if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
return;
}
if (
!isset($_POST[static::NONCE]) ||
!wp_verify_nonce($_POST[static::NONCE], static::NONCE . $post_id)
) {
return;
}
$type = get_post_type_object($post->post_type);
if (!current_user_can($type->cap->edit_post, $post_id)) {
return;
}
$menu = isset($_POST[static::FIELD]) ? $_POST[static::FIELD] : false;
if ($menu && '-' !== $menu) {
update_post_meta($post_id, static::FIELD, absint($menu));
} else {
delete_post_meta($post_id, static::FIELD);
}
}
public function switchMenu($args)
{
// we can only deal with singular pages
if (!is_singular()) {
return;
}
$switch = apply_filters(
'per_post_nav_menus_switch',
isset($args['theme_location']) && static::LOC === $args['theme_location'],
$args
);
// if we're allowed to switch, the the `menu` argument to
// the correct menu ID.
if ($switch) {
$menu = get_post_meta(get_queried_object_id(), static::FIELD, true);
if ('-' !== $menu) {
$args['menu'] = absint($menu);
}
}
return $args;
}
private function getNavMenus()
{
$terms = get_terms('nav_menu');
$menus = array('-' => __('Default', 'wpse'));
if ($terms && !is_wp_error($terms)) {
foreach($terms as $t) {
$menus[$t->term_id] = $t->name;
}
}
return apply_filters('per_post_nav_menus_list', $menus);
}
}
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