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<?php

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/**

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* Widget API: WP_Nav_Menu_Widget class

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* @package WordPress

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* @subpackage Widgets

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* @since 4.4.0

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/**

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* Core class used to implement the Navigation Menu widget.

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* @since 3.0.0

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* @see WP_Widget

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class WP_Nav_Menu_Widget extends WP_Widget {

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/**

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* Sets up a new Navigation Menu widget instance.

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* @since 3.0.0

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public function __construct() {

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$widget_ops = array(

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'description' => __( 'Add a navigation menu to your sidebar.' ),

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'customize_selective_refresh' => true,

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'show_instance_in_rest' => true,

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);

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parent::__construct( 'nav_menu', __( 'Navigation Menu' ), $widget_ops );

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}

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/**

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* Outputs the content for the current Navigation Menu widget instance.

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* @since 3.0.0

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* @param array $args Display arguments including 'before_title', 'after_title',

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* 'before_widget', and 'after_widget'.

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* @param array $instance Settings for the current Navigation Menu widget instance.

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public function widget( $args, $instance ) {

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// Get menu.

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$nav_menu = ! empty( $instance['nav_menu'] ) ? wp_get_nav_menu_object( $instance['nav_menu'] ) : false;

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if ( ! $nav_menu ) {

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return;

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}

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$default_title = __( 'Menu' );

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$title = ! empty( $instance['title'] ) ? $instance['title'] : '';

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/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */

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$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );

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echo $args['before_widget'];

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if ( $title ) {

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echo $args['before_title'] . $title . $args['after_title'];

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}

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$format = current_theme_supports( 'html5', 'navigation-widgets' ) ? 'html5' : 'xhtml';

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/**

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* Filters the HTML format of widgets with navigation links.

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* @since 5.5.0

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* @param string $format The type of markup to use in widgets with navigation links.

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* Accepts 'html5', 'xhtml'.

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$format = apply_filters( 'navigation_widgets_format', $format );

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if ( 'html5' === $format ) {

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// The title may be filtered: Strip out HTML and make sure the aria-label is never empty.

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$title = trim( strip_tags( $title ) );

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$aria_label = $title ? $title : $default_title;

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$nav_menu_args = array(

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'fallback_cb' => '',

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'menu' => $nav_menu,

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'container' => 'nav',

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'container_aria_label' => $aria_label,

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'items_wrap' => '<ul id="%1$s" class="%2$s">%3$s</ul>',

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);

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} else {

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$nav_menu_args = array(

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'fallback_cb' => '',

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'menu' => $nav_menu,

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);

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}

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/**

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* Filters the arguments for the Navigation Menu widget.

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* @since 4.2.0

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* @since 4.4.0 Added the `$instance` parameter.

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* @param array $nav_menu_args {

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* An array of arguments passed to wp_nav_menu() to retrieve a navigation menu.

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* @type callable|bool $fallback_cb Callback to fire if the menu doesn't exist. Default empty.

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* @type mixed $menu Menu ID, slug, or name.

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* }

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* @param WP_Term $nav_menu Nav menu object for the current menu.

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* @param array $args Display arguments for the current widget.

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* @param array $instance Array of settings for the current widget.

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wp_nav_menu( apply_filters( 'widget_nav_menu_args', $nav_menu_args, $nav_menu, $args, $instance ) );

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echo $args['after_widget'];

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}

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/**

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* Handles updating settings for the current Navigation Menu widget instance.

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* @since 3.0.0

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* @param array $new_instance New settings for this instance as input by the user via

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* WP_Widget::form().

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* @param array $old_instance Old settings for this instance.

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* @return array Updated settings to save.

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public function update( $new_instance, $old_instance ) {

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$instance = array();

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if ( ! empty( $new_instance['title'] ) ) {

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$instance['title'] = sanitize_text_field( $new_instance['title'] );

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}

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if ( ! empty( $new_instance['nav_menu'] ) ) {

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$instance['nav_menu'] = (int) $new_instance['nav_menu'];

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}

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return $instance;

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}

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/**

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* Outputs the settings form for the Navigation Menu widget.

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* @since 3.0.0

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* @global WP_Customize_Manager $wp_customize

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* @param array $instance Current settings.

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public function form( $instance ) {

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global $wp_customize;

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$title = isset( $instance['title'] ) ? $instance['title'] : '';

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$nav_menu = isset( $instance['nav_menu'] ) ? $instance['nav_menu'] : '';

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// Get menus.

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$menus = wp_get_nav_menus();

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$empty_menus_style = '';

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$not_empty_menus_style = '';

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if ( empty( $menus ) ) {

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$empty_menus_style = ' style="display:none" ';

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} else {

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$not_empty_menus_style = ' style="display:none" ';

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}

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$nav_menu_style = '';

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if ( ! $nav_menu ) {

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$nav_menu_style = 'display: none;';

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}

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// If no menus exists, direct the user to go and create some.

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<?php

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if ( $wp_customize instanceof WP_Customize_Manager ) {

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$url = 'javascript: wp.customize.panel( "nav_menus" ).focus();';

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} else {

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$url = admin_url( 'nav-menus.php' );

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}

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printf(

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/* translators: %s: URL to create a new menu. */

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__( 'No menus have been created yet. <a href="%s">Create some</a>.' ),

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// The URL can be a `javascript:` link, so esc_attr() is used here instead of esc_url().

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esc_attr( $url )

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);

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</p>

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<p>

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<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label>

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<input type="text" class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo esc_attr( $title ); ?>" />

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</p>

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<p>

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<label for="<?php echo $this->get_field_id( 'nav_menu' ); ?>"><?php _e( 'Select Menu:' ); ?></label>

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<select id="<?php echo $this->get_field_id( 'nav_menu' ); ?>" name="<?php echo $this->get_field_name( 'nav_menu' ); ?>">

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<?php foreach ( $menus as $menu ) : ?>

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<?php echo esc_html( $menu->name ); ?>

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</option>

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<?php endforeach; ?>

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</select>

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</p>

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<?php if ( $wp_customize instanceof WP_Customize_Manager ) : ?>

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</p>

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<?php endif; ?>

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</div>

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<?php

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}

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}

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