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Prospect Ogujiuba
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<?php
/**
* Class Name: PG_Smart_Walker_Nav_Menu
* GitHub URI:
* Description:
* Version: 2.0
* Author: Matjaz Trontelj - @pinegrow
* License: GPL-2.0+
* License URI: http://www.gnu.org/licenses/gpl-2.0.txt
* Based on WordPress Walker_Nav_Menu code
*
*/
class PG_Smart_Walker_Nav_Menu extends Walker_Nav_Menu {
private static $default_options = array(
'top_element' => 'ul',
'sub_element' => 'ul',
'current_class' => 'current-menu-item',
'sub_menu_class' => 'sub-menu',
'item_id_prefix' => 'menu-item-',
'template' => '<li id="{ID}" class="{CLASSES}">{LINK_BEFORE}<a {ATTRS}>{TITLE}</a>{LINK_AFTER}</li>',
'template_item_with_sublevel' => null,
'template_sublevel' => null,
'template_subitem' => null
);
public static $options = array();
private static $level = 0;
private static $current_id = '';
private static $count = 0;
public static function init() {
self::$options = self::$default_options;
self::$level = 0;
self::$current_id = '';
self::$count++;
}
/**
* Get the begining or end part of the template
*
* @param boolean $start true for begining, false for end part
*/
private function get_template_part( $start = true, $template = 'template' ) {
$parts = explode('{SUB}', self::$options[ $template ]);
if(count($parts) == 2) {
return $start ? $parts[0] : $parts[1];
}
//if {SUB} is missing from the template, assume the last closing tag is the end part
$idx = strrpos(self::$options[ $template ], '</');
if($idx !== false) {
return $start ? substr(self::$options[ $template ], 0, $idx) : substr(self::$options[ $template ], $idx);
}
}
/**
* Starts the list before the elements are added.
*
* @see Walker::start_lvl()
*
* @since 3.0.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Depth of menu item. Used for padding.
* @param array $args An array of arguments. @see wp_nav_menu()
*/
public function start_lvl( &$output, $depth = 0, $args = array() ) {
self::$level++;
$indent = str_repeat("\t", $depth);
if(self::$level > 0 && self::$options['template_sublevel']) {
$output .= "\n$indent" . str_replace('{ID}', self::$current_id,self::get_template_part(true, 'template_sublevel'));
} else {
$tag = $depth == 0 ? self::$options['top_element'] : self::$options['sub_element'];
if (!empty($tag)) {
$class = self::$options['sub_menu_class'];
$output .= "\n$indent<$tag class=\"$class\">\n";
}
}
}
/**
* Ends the list of after the elements are added.
*
* @see Walker::end_lvl()
*
* @since 3.0.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Depth of menu item. Used for padding.
* @param array $args An array of arguments. @see wp_nav_menu()
*/
public function end_lvl( &$output, $depth = 0, $args = array() ) {
$indent = str_repeat("\t", $depth);
if(self::$level > 0 && self::$options['template_sublevel']) {
$output .= "\n$indent" . self::get_template_part(false, 'template_sublevel');
} else {
$tag = $depth == 0 ? self::$options['top_element'] : self::$options['sub_element'];
if (!empty($tag)) {
$output .= "$indent</$tag>\n";
}
}
self::$level--;
}
/**
* Start the element output.
*
* @see Walker::start_el()
*
* @since 3.0.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param object $item Menu item data object.
* @param int $depth Depth of menu item. Used for padding.
* @param array $args An array of arguments. @see wp_nav_menu()
* @param int $id Current item ID.
*/
public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
$classes[] = 'menu-item-' . $item->ID;
/**
* Filter the CSS class(es) applied to a menu item's list item element.
*
* @since 3.0.0
* @since 4.1.0 The `$depth` parameter was added.
*
* @param array $classes The CSS classes that are applied to the menu item's `<li>` element.
* @param object $item The current menu item.
* @param array $args An array of {@see wp_nav_menu()} arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$classes = apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args, $depth );
foreach($classes as $i => $class) {
if($classes[$i] == 'current-menu-item') {
$classes[$i] = self::$options['current_class'];
}
}
$class_names = join( ' ', $classes);
/**
* Filter the ID applied to a menu item's list item element.
*
* @since 3.0.1
* @since 4.1.0 The `$depth` parameter was added.
*
* @param string $menu_id The ID that is applied to the menu item's `<li>` element.
* @param object $item The current menu item.
* @param array $args An array of {@see wp_nav_menu()} arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$id = apply_filters( 'nav_menu_item_id', self::$options['item_id_prefix']. $item->ID, $item, $args, $depth );
if(empty($id)) {
//most likely the default id was already used. Set a count based id
$id = self::$options['item_id_prefix'].self::$count.'-'.$item->ID;
}
self::$current_id = $id;
$output .= $indent;
$atts = array();
$atts['title'] = ! empty( $item->attr_title ) ? $item->attr_title : '';
$atts['target'] = ! empty( $item->target ) ? $item->target : '';
$atts['rel'] = ! empty( $item->xfn ) ? $item->xfn : '';
$atts['href'] = ! empty( $item->url ) ? $item->url : '';
/**
* Filter the HTML attributes applied to a menu item's anchor element.
*
* @since 3.6.0
* @since 4.1.0 The `$depth` parameter was added.
*
* @param array $atts {
* The HTML attributes applied to the menu item's `<a>` element, empty strings are ignored.
*
* @type string $title Title attribute.
* @type string $target Target attribute.
* @type string $rel The rel attribute.
* @type string $href The href attribute.
* }
* @param object $item The current menu item.
* @param array $args An array of {@see wp_nav_menu()} arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args, $depth );
$attributes = '';
foreach ( $atts as $attr => $value ) {
if ( ! empty( $value ) ) {
$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
$attributes .= ' ' . $attr . '="' . $value . '"';
}
}
$item_output = $args->before;
$has_sublevel = false;
if(isset($item->classes) && in_array('menu-item-has-children', $item->classes)) {
$has_sublevel = true;
}
$template_key = 'template';
if(self::$level === 0 && $has_sublevel && self::$options['template_item_with_sublevel']) {
$template_key = 'template_item_with_sublevel';
} else if(self::$level > 0 && self::$options['template_subitem']) {
$template_key = 'template_subitem';
}
$template = $this->get_template_part(true, $template_key);
$template = str_replace( '{LINK_BEFORE}', $args->link_before, $template);
$template = str_replace( '{LINK_AFTER}', $args->link_after, $template);
$template = str_replace( '{TITLE}', apply_filters( 'the_title', $item->title, $item->ID ), $template);
$template = str_replace( '{ATTRS}', $attributes, $template);
$template = str_replace( '{ID}', $id, $template);
$template = str_replace( '{CLASSES}', $class_names, $template);
$item_output .= $template;
$item_output .= $args->after;
/**
* Filter a menu item's starting output.
*
* The menu item's starting output only includes `$args->before`, the opening `<a>`,
* the menu item's title, the closing `</a>`, and `$args->after`. Currently, there is
* no filter for modifying the opening and closing `<li>` for a menu item.
*
* @since 3.0.0
*
* @param string $item_output The menu item's starting HTML output.
* @param object $item Menu item data object.
* @param int $depth Depth of menu item. Used for padding.
* @param array $args An array of {@see wp_nav_menu()} arguments.
*/
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}
/**
* Ends the element output, if needed.
*
* @see Walker::end_el()
*
* @since 3.0.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param object $item Page data object. Not used.
* @param int $depth Depth of page. Not Used.
* @param array $args An array of arguments. @see wp_nav_menu()
*/
public function end_el( &$output, $item, $depth = 0, $args = array() ) {
$has_sublevel = false;
if(isset($item->classes) && in_array('menu-item-has-children', $item->classes)) {
$has_sublevel = true;
}
$template_key = 'template';
if(self::$level === 0 && $has_sublevel && self::$options['template_item_with_sublevel']) {
$template_key = 'template_item_with_sublevel';
} else if(self::$level > 0 && self::$options['template_subitem']) {
$template_key = 'template_subitem';
}
$output .= $this->get_template_part(false, $template_key)."\n"; //get the ending part of the template
}
} // PG_Smart_Walker_Nav_Menu