Page.php

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<?php
namespace Magento\Backend\Model\View\Result;

use Magento\Framework\Translate;
use Magento\Framework\View;

class Page extends View\Result\Page
{
    public function setActiveMenu($itemId)
    {
        $menuBlock = $this->layout->getBlock('menu');
        $menuBlock->setActive($itemId);
        $parents = $menuBlock->getMenuModel()->getParentItems($itemId);
        foreach ($parents as $item) {
            $this->getConfig()->getTitle()->prepend($item->getTitle());
        }
        return $this;
    }

    public function addBreadcrumb($label, $title, $link = null)
    {
        $block = $this->layout->getBlock('breadcrumbs');
        if ($block) {
            $block->addLink($label, $title, $link);
        }
        return $this;
    }

    public function addContent(View\Element\AbstractBlock $block)
    {
        return $this->moveBlockToContainer($block, 'content');
    }

    public function addLeft(View\Element\AbstractBlock $block)
    {
        return $this->moveBlockToContainer($block, 'left');
    }

    public function addJs(View\Element\AbstractBlock $block)
    {
        return $this->moveBlockToContainer($block, 'js');
    }

    protected function moveBlockToContainer(View\Element\AbstractBlock $block, $containerName)
    {
        $this->layout->setChild($containerName, $block->getNameInLayout(), '');
        return $this;
    }
}