Sample menu item implementation

app.php

<?php
use Sample\Menu\Item\SampleItem;

\Events::addListener(
    'on_before_render',
    function () {
        \Core::make('helper/concrete/ui/menu')->addMenuItem(new SampleItem);
    });

SampleController.php

<?php
namespace Sample\Menu\Item;

use Concrete\Core\Application\UserInterface\Menu\Item\ControllerInterface;
use Concrete\Core\Application\UserInterface\Menu\Item\ItemInterface;
use HtmlObject\Element;

class SampleController implements ControllerInterface
{

    /** @var ItemInterface */
    protected $item;

    /**
     * Determine whether item should be displayed
     *
     * @return bool
     */
    public function displayItem()
    {
        return true;
    }

    /**
     * We don't have any assets
     *
     * @return void
     */
    public function registerViewAssets()
    {

    }

    /**
     * @return \HtmlObject\Traits\Tag
     */
    public function getMenuItemLinkElement()
    {
        return new Element('div', date(DATE_ATOM));
    }

    /**
     * @param ItemInterface $item
     * @return void
     */
    public function setMenuItem(ItemInterface $item)
    {
        $this->item = $item;
    }

    /**
     * @return ItemInterface
     */
    public function getMenuItem()
    {
        return $this->item;
    }

}

SampleItem.php

<?php
namespace Sample\Menu\Item;

use Concrete\Core\Application\UserInterface\Menu\Item\ControllerInterface;
use Concrete\Core\Application\UserInterface\Menu\Item\ItemInterface;

class SampleItem implements ItemInterface
{

    /** @var ControllerInterface */
    protected $controller;

    /** @var string [right|left] */
    protected $position = 'left';

    public function __construct()
    {
        $this->setController(new SampleController);
    }

    /**
     * @return ControllerInterface
     */
    public function getController()
    {
        return $this->controller;
    }

    /**
     * @param ControllerInterface $controller
     * @return void
     */
    public function setController(ControllerInterface $controller)
    {
        $this->controller = $controller;
    }

    /**
     * @return bool
     */
    public function getPosition()
    {
        return $this->position;
    }

}