<?php
/**
* Post API: Walker_Page class
*
* @package WordPress
* @subpackage Template
* @since 4.4.0
*/
/**
* Core walker class used to create an HTML list of pages.
*
* @since 2.1.0
*
* @see Walker
*/
class Walker_Page extends Walker {
/**
* What the class handles.
*
* @since 2.1.0
* @access public
* @var string
*
* @see Walker::$tree_type
*/
public $tree_type = 'page';
/**
* Database fields to use.
*
* @since 2.1.0
* @access private
* @var array
*
* @see Walker::$db_fields
* @todo Decouple this.
*/
public $db_fields = array( 'parent' => 'post_parent', 'id' => 'ID' );
/**
* Outputs the beginning of the current level in the tree before elements are output.
*
* @since 2.1.0
* @access public
*
* @see Walker::start_lvl()
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Optional. Depth of page. Used for padding. Default 0.
* @param array $args Optional. Arguments for outputting the next level.
* Default empty array.
*/
public function start_lvl( &$output, $depth = 0, $args = array() ) {
if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
$t = "\t";
$n = "\n";
} else {
$t = '';
$n = '';
}
$indent = str_repeat( $t, $depth );
$output .= "{$n}{$indent}<ul class='children'>{$n}";
}
/**
* Outputs the end of the current level in the tree after elements are output.
*
* @since 2.1.0
* @access public
*
* @see Walker::end_lvl()
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Optional. Depth of page. Used for padding. Default 0.
* @param array $args Optional. Arguments for outputting the end of the current level.
* Default empty array.
*/
public function end_lvl( &$output, $depth = 0, $args = array() ) {
if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
$t = "\t";
$n = "\n";
} else {
$t = '';
$n = '';
}
$indent = str_repeat( $t, $depth );
$output .= "{$indent}</ul>{$n}";
}
/**
* Outputs the beginning of the current element in the tree.
*
* @see Walker::start_el()
* @since 2.1.0
* @access public
*
* @param string $output Used to append additional content. Passed by reference.
* @param WP_Post $page Page data object.
* @param int $depth Optional. Depth of page. Used for padding. Default 0.
* @param array $args Optional. Array of arguments. Default empty array.
* @param int $current_page Optional. Page ID. Default 0.
*/
public function start_el( &$output, $page, $depth = 0, $args = array(), $current_page = 0 ) {
if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
$t = "\t";
$n = "\n";
} else {
$t = '';
$n = '';
}
if ( $depth ) {
$indent = str_repeat( $t, $depth );
} else {
$indent = '';
}
$css_class = array( 'page_item', 'page-item-' . $page->ID );
if ( isset( $args['pages_with_children'][ $page->ID ] ) ) {
$css_class[] = 'page_item_has_children';
}
if ( ! empty( $current_page ) ) {
$_current_page = get_post( $current_page );
if ( $_current_page && in_array( $page->ID, $_current_page->ancestors ) ) {
$css_class[] = 'current_page_ancestor';
}
if ( $page->ID == $current_page ) {
$css_class[] = 'current_page_item';
} elseif ( $_current_page && $page->ID == $_current_page->post_parent ) {
$css_class[] = 'current_page_parent';
}
} elseif ( $page->ID == get_option('page_for_posts') ) {
$css_class[] = 'current_page_parent';
}
/**
* Filters the list of CSS classes to include with each page item in the list.
*
* @since 2.8.0
*
* @see wp_list_pages()
*
* @param array $css_class An array of CSS classes to be applied
* to each list item.
* @param WP_Post $page Page data object.
* @param int $depth Depth of page, used for padding.
* @param array $args An array of arguments.
* @param int $current_page ID of the current page.
*/
$css_classes = implode( ' ', apply_filters( 'page_css_class', $css_class, $page, $depth, $args, $current_page ) );
if ( '' === $page->post_title ) {
/* translators: %d: ID of a post */
$page->post_title = sprintf( __( '#%d (no title)' ), $page->ID );
}
$args['link_before'] = empty( $args['link_before'] ) ? '' : $args['link_before'];
$args['link_after'] = empty( $args['link_after'] ) ? '' : $args['link_after'];
$output .= $indent . sprintf(
'<li class="%s"><a href="%s">%s%s%s</a>',
$css_classes,
get_permalink( $page->ID ),
$args['link_before'],
/** This filter is documented in wp-includes/post-template.php */
apply_filters( 'the_title', $page->post_title, $page->ID ),
$args['link_after']
);
if ( ! empty( $args['show_date'] ) ) {
if ( 'modified' == $args['show_date'] ) {
$time = $page->post_modified;
} else {
$time = $page->post_date;
}
$date_format = empty( $args['date_format'] ) ? '' : $args['date_format'];
$output .= " " . mysql2date( $date_format, $time );
}
}
/**
* Outputs the end of the current element in the tree.
*
* @since 2.1.0
* @access public
*
* @see Walker::end_el()
*
* @param string $output Used to append additional content. Passed by reference.
* @param WP_Post $page Page data object. Not used.
* @param int $depth Optional. Depth of page. Default 0 (unused).
* @param array $args Optional. Array of arguments. Default empty array.
*/
public function end_el( &$output, $page, $depth = 0, $args = array() ) {
if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
$t = "\t";
$n = "\n";
} else {
$t = '';
$n = '';
}
$output .= "</li>{$n}";
}
}
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