HTML Examples/WP.iso/wordpress/wp-includes/widgets/class-wp-nav-menu-widget.php

PHP Script | 2017-10-15 | 5.2 KB | 160 lines

<?php
/**
 * Widget API: WP_Nav_Menu_Widget class
 *
 * @package WordPress
 * @subpackage Widgets
 * @since 4.4.0
 */

/**
 * Core class used to implement the Navigation Menu widget.
 *
 * @since 3.0.0
 *
 * @see WP_Widget
 */
class WP_Nav_Menu_Widget extends WP_Widget {

    /**
     * Sets up a new Navigation Menu widget instance.
     *
     * @since 3.0.0
     */
    public function __construct() {
        $widget_ops = array(
            'description' => __( 'Add a navigation menu to your sidebar.' ),
            'customize_selective_refresh' => true,
        );
        parent::__construct( 'nav_menu', __('Navigation Menu'), $widget_ops );
    }

    /**
     * Outputs the content for the current Navigation Menu widget instance.
     *
     * @since 3.0.0
     *
     * @param array $args     Display arguments including 'before_title', 'after_title',
     *                        'before_widget', and 'after_widget'.
     * @param array $instance Settings for the current Navigation Menu widget instance.
     */
    public function widget( $args, $instance ) {
        // Get menu
        $nav_menu = ! empty( $instance['nav_menu'] ) ? wp_get_nav_menu_object( $instance['nav_menu'] ) : false;

        if ( ! $nav_menu ) {
            return;
        }

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

        /** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
        $title = apply_filters( 'widget_title', $title, $instance, $this->id_base );

        echo $args['before_widget'];

        if ( $title ) {
            echo $args['before_title'] . $title . $args['after_title'];
        }

        $nav_menu_args = array(
            'fallback_cb' => '',
            'menu'        => $nav_menu
        );

        /**
         * Filters the arguments for the Navigation Menu widget.
         *
         * @since 4.2.0
         * @since 4.4.0 Added the `$instance` parameter.
         *
         * @param array    $nav_menu_args {
         *     An array of arguments passed to wp_nav_menu() to retrieve a navigation menu.
         *
         *     @type callable|bool $fallback_cb Callback to fire if the menu doesn't exist. Default empty.
         *     @type mixed         $menu        Menu ID, slug, or name.
         * }
         * @param WP_Term  $nav_menu      Nav menu object for the current menu.
         * @param array    $args          Display arguments for the current widget.
         * @param array    $instance      Array of settings for the current widget.
         */
        wp_nav_menu( apply_filters( 'widget_nav_menu_args', $nav_menu_args, $nav_menu, $args, $instance ) );

        echo $args['after_widget'];
    }

    /**
     * Handles updating settings for the current Navigation Menu widget instance.
     *
     * @since 3.0.0
     *
     * @param array $new_instance New settings for this instance as input by the user via
     *                            WP_Widget::form().
     * @param array $old_instance Old settings for this instance.
     * @return array Updated settings to save.
     */
    public function update( $new_instance, $old_instance ) {
        $instance = array();
        if ( ! empty( $new_instance['title'] ) ) {
            $instance['title'] = sanitize_text_field( $new_instance['title'] );
        }
        if ( ! empty( $new_instance['nav_menu'] ) ) {
            $instance['nav_menu'] = (int) $new_instance['nav_menu'];
        }
        return $instance;
    }

    /**
     * Outputs the settings form for the Navigation Menu widget.
     *
     * @since 3.0.0
     *
     * @param array $instance Current settings.
     * @global WP_Customize_Manager $wp_customize
     */
    public function form( $instance ) {
        global $wp_customize;
        $title = isset( $instance['title'] ) ? $instance['title'] : '';
        $nav_menu = isset( $instance['nav_menu'] ) ? $instance['nav_menu'] : '';

        // Get menus
        $menus = wp_get_nav_menus();

        // If no menus exists, direct the user to go and create some.
        ?>
        <p class="nav-menu-widget-no-menus-message" <?php if ( ! empty( $menus ) ) { echo ' style="display:none" '; } ?>>
            <?php
            if ( $wp_customize instanceof WP_Customize_Manager ) {
                $url = 'javascript: wp.customize.panel( "nav_menus" ).focus();';
            } else {
                $url = admin_url( 'nav-menus.php' );
            }
            ?>
            <?php echo sprintf( __( 'No menus have been created yet. <a href="%s">Create some</a>.' ), esc_attr( $url ) ); ?>
        </p>
        <div class="nav-menu-widget-form-controls" <?php if ( empty( $menus ) ) { echo ' style="display:none" '; } ?>>
            <p>
                <label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ) ?></label>
                <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 ); ?>"/>
            </p>
            <p>
                <label for="<?php echo $this->get_field_id( 'nav_menu' ); ?>"><?php _e( 'Select Menu:' ); ?></label>
                <select id="<?php echo $this->get_field_id( 'nav_menu' ); ?>" name="<?php echo $this->get_field_name( 'nav_menu' ); ?>">
                    <option value="0"><?php _e( '— Select —' ); ?></option>
                    <?php foreach ( $menus as $menu ) : ?>
                        <option value="<?php echo esc_attr( $menu->term_id ); ?>" <?php selected( $nav_menu, $menu->term_id ); ?>>
                            <?php echo esc_html( $menu->name ); ?>
                        </option>
                    <?php endforeach; ?>
                </select>
            </p>
            <?php if ( $wp_customize instanceof WP_Customize_Manager ) : ?>
                <p class="edit-selected-nav-menu" style="<?php if ( ! $nav_menu ) { echo 'display: none;'; } ?>">
                    <button type="button" class="button"><?php _e( 'Edit Menu' ) ?></button>
                </p>
            <?php endif; ?>
        </div>
        <?php
    }
}