item.php

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<?php
$item = elgg_extract('item', $vars);
if (!$item instanceof ElggMenuItem) {
    return;
}

$item_vars = [];
$child_menu_view = '';

$children = $item->getChildren();
if (!empty($children)) {
    $link_class = 'elgg-menu-closed';
    if ($item->getSelected()) {
        $link_class = 'elgg-menu-opened';
    }
    $item->addLinkClass($link_class);

    $item->addLinkClass('elgg-menu-parent');

    $child_menu_vars = $item->getChildMenuOptions();
    $child_menu_vars['items'] = $children;
    $child_menu_vars['class'] = elgg_extract_class($child_menu_vars, ['elgg-menu', 'elgg-child-menu']);

    $display = elgg_extract('display', $child_menu_vars, 'default');
    unset($child_menu_vars['display']);

    switch ($display) {
        case 'dropdown' :
            $item->addDeps(['elgg/menus/dropdown']);
            $item->addItemClass('elgg-menu-item-has-dropdown');
            break;

        case 'toggle' :
            $item->addDeps(['elgg/menus/toggle']);
            $item->addItemClass('elgg-menu-item-has-toggle');
            break;
    }

    $child_menu_view = elgg_view('navigation/menu/elements/section', $child_menu_vars);
}

$item_vars['data-menu-item'] = $item->getName();

$item_vars['class'] = elgg_extract_class($vars, $item->getItemClass(), 'item_class');
if ($item->getSelected()) {
    $item_vars['class'][] = "elgg-state-selected";
}

$item_view = elgg_view_menu_item($item) . $child_menu_view;

echo elgg_format_element('li', $item_vars, $item_view);