Ticket #6503: bp_core_new_nav_item_excerpt.02.php

<?php
/**
 * Add an item to the main BuddyPress navigation array.
 *
 * @param array $args {
 *     Array describing the new nav item.
 *     @type string      $name                    Display name for the nav item.
 *     @type string      $slug                    Unique URL slug for the nav item.
 *     @type bool|string $item_css_id             Optional. 'id' attribute for the nav item. Default: the value of `$slug`.
 *     @type bool        $show_for_displayed_user Optional. Whether the nav item should be visible when viewing a
 *                                                member profile other than your own. Default: true.
 *     @type bool        $site_admin_only         Optional. Whether the nav item should be visible only to site admins
 *                                                (those with the 'bp_moderate' cap). Default: false.
 *     @type int         $position                Optional. Numerical index specifying where the item should appear in
 *                                                the nav array. Default: 99.
 *     @type callable    $screen_function         The callback function that will run when the nav item is clicked.
 *     @type bool|string $default_subnav_slug     Optional. The slug of the default subnav item to select when the nav
 *                                                item is clicked.
 * }
 * @return bool|null Returns false on failure.
 */
function bp_core_new_nav_item( $args = '' ) {

        $defaults = array(
                'name'                    => false, // Display name for the nav item
                'slug'                    => false, // URL slug for the nav item
                'item_css_id'             => false, // The CSS ID to apply to the HTML of the nav item
                'show_for_displayed_user' => true,  // When viewing another user does this nav item show up?
                'site_admin_only'         => false, // Can only site admins see this nav item?
                'position'                => 99,    // Index of where this nav item should be positioned
                'screen_function'         => false, // The name of the function to run when clicked
                'default_subnav_slug'     => false  // The slug of the default subnav item to select when clicked
        );

        $r = wp_parse_args( $args, $defaults );

        // First, add the nav item link to the bp_nav array.
        $created = bp_core_create_nav_link( $r );

        // To mimic the existing behavior, if bp_core_create_nav_link()
        // returns false, we make an early exit and don't attempt to register
        // the screen function.
        if ( false === $created ) {
                return false;
        }

        // Then, hook the screen function for the added nav item.
        bp_core_register_nav_screen_function( $r );

        /**
         * Fires after adding an item to the main BuddyPress navigation array.
         *
         * @since BuddyPress (1.5.0)
         *
         * @param array $r        Parsed arguments for the nav item.
         * @param array $args     Originally passed in arguments for the nav item.
         * @param array $defaults Default arguments for a nav item.
         */
        do_action( 'bp_core_new_nav_item', $r, $args, $defaults );
}

/**
 * Add a link to the main BuddyPress navigation array.
 *
 * @since BuddyPress (2.4.0)
 *
 * @param array $r {
 *     Array describing the new nav item.
 *     @type string      $name                    Display name for the nav item.
 *     @type string      $slug                    Unique URL slug for the nav item.
 *     @type bool|string $item_css_id             Optional. 'id' attribute for the nav item. Default: the value of `$slug`.
 *     @type bool        $show_for_displayed_user Optional. Whether the nav item should be visible when viewing a
 *                                                member profile other than your own. Default: true.
 *     @type bool        $site_admin_only         Optional. Whether the nav item should be visible only to site admins
 *                                                (those with the 'bp_moderate' cap). Default: false.
 *     @type int         $position                Optional. Numerical index specifying where the item should appear in
 *                                                the nav array. Default: 99.
 *     @type callable    $screen_function         The callback function that will run when the nav item is clicked.
 *     @type bool|string $default_subnav_slug     Optional. The slug of the default subnav item to select when the nav
 *                                                item is clicked.
 * }
 * @return bool|null Returns false on failure.
 */
function bp_core_create_nav_link( $r = '' ) {
        $bp = buddypress();

        // If we don't have the required info we need, don't create this nav item
        if ( empty( $r['name'] ) || empty( $r['slug'] ) ) {
                return false;
        }

        // If this is for site admins only and the user is not one, don't create the subnav item
        if ( ! empty( $r['site_admin_only'] ) && ! bp_current_user_can( 'bp_moderate' ) ) {
                return false;
        }

        /**
         * If this nav item is hidden for the displayed user, and
         * the logged in user is not the displayed user
         * looking at their own profile, don't create the nav item.
         */
        if ( empty( $r['show_for_displayed_user'] ) && ! bp_user_has_access() ) {
                return false;
        }

        if ( empty( $r['item_css_id'] ) ) {
                $r['item_css_id'] = $r['slug'];
        }

        $bp->bp_nav[$r['slug']] = array(
                'name'                    => $r['name'],
                'slug'                    => $r['slug'],
                'link'                    => trailingslashit( bp_loggedin_user_domain() . $r['slug'] ),
                'css_id'                  => $r['item_css_id'],
                'show_for_displayed_user' => $r['show_for_displayed_user'],
                'position'                => $r['position'],
                'screen_function'         => &$r['screen_function'],
                'default_subnav_slug'     => $r['default_subnav_slug']
        );
}

/**
 * Register a screen function, whether or not a related nav link exists.
 *
 * @since BuddyPress (2.4.0)
 *
 * @param array $r {
 *     Array describing the new nav item.
 *     @type string      $name                    Display name for the nav item.
 *     @type string      $slug                    Unique URL slug for the nav item.
 *     @type bool|string $item_css_id             Optional. 'id' attribute for the nav item. Default: the value of `$slug`.
 *     @type bool        $show_for_displayed_user Optional. Whether the nav item should be visible when viewing a
 *                                                member profile other than your own. Default: true.
 *     @type bool        $site_admin_only         Optional. Whether the nav item should be visible only to site admins
 *                                                (those with the 'bp_moderate' cap). Default: false.
 *     @type int         $position                Optional. Numerical index specifying where the item should appear in
 *                                                the nav array. Default: 99.
 *     @type callable    $screen_function         The callback function that will run when the nav item is clicked.
 *     @type bool|string $default_subnav_slug     Optional. The slug of the default subnav item to select when the nav
 *                                                item is clicked.
 * }
 * @return bool|null Returns false on failure.
 */
function bp_core_register_nav_screen_function( $r = '' ) {
        $bp = buddypress();

        // If we don't have the required info we need, don't create this subnav item
        if ( empty( $r['slug'] ) ) {
                return false;
        }

        // If this is for site admins only and the user is not one, don't create the subnav item
        if ( ! empty( $r['site_admin_only'] ) && ! bp_current_user_can( 'bp_moderate' ) ) {
                return false;
        }

        /**
         * If this nav item is hidden for the displayed user, and
         * the logged in user is not the displayed user
         * looking at their own profile, don't create the nav item.
         */
        if ( empty( $r['show_for_displayed_user'] ) && ! bp_user_has_access() ) {
                return false;
        }

        /**
         * If the nav item is visible, we are not viewing a user, and this is a root
         * component, don't attach the default subnav function so we can display a
         * directory or something else.
         */
        if ( ( -1 != $r['position'] ) && bp_is_root_component( $r['slug'] ) && ! bp_displayed_user_id() ) {
                return;
        }

        // Look for current component
        if ( bp_is_current_component( $r['slug'] ) || bp_is_current_item( $r['slug'] ) ) {

                // The requested URL has explicitly included the default subnav
                // (eg: http://example.com/members/membername/activity/just-me/)
                // The canonical version will not contain this subnav slug.
                if ( ! empty( $r['default_subnav_slug'] ) && bp_is_current_action( $r['default_subnav_slug'] ) && ! bp_action_variable( 0 ) ) {
                        unset( $bp->canonical_stack['action'] );
                } elseif ( ! bp_current_action() ) {

                        // Add our screen hook if screen function is callable
                        if ( is_callable( $r['screen_function'] ) ) {
                                add_action( 'bp_screens', $r['screen_function'], 3 );
                        }

                        if ( ! empty( $r['default_subnav_slug'] ) ) {

                                /**
                                 * Filters the default component subnav item.
                                 *
                                 * @since BuddyPress (1.5.0)
                                 *
                                 * @param string $default_subnav_slug The slug of the default subnav item
                                 *                                    to select when clicked.
                                 * @param array  $r                   Parsed arguments for the nav item.
                                 */
                                $bp->current_action = apply_filters( 'bp_default_component_subnav', $r['default_subnav_slug'], $r );
                        }
                }
        }
}