Container.php

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<?php
namespace Magento\Backend\Block\Widget;

use Magento\Framework\View\Element\Template;

class Container extends \Magento\Backend\Block\Template implements ContainerInterface
{
    const PARAM_CONTROLLER = 'controller';

    const PARAM_HEADER_TEXT = 'header_text';

    protected $_controller = 'empty';

    protected $_headerText = 'Container Widget Header';

    protected $buttonList;

    protected $toolbar;

    public function __construct(\Magento\Backend\Block\Widget\Context $context, array $data = [])
    {
        $this->buttonList = $context->getButtonList();
        $this->toolbar = $context->getButtonToolbar();
        parent::__construct($context, $data);
    }

    protected function _construct()
    {
        parent::_construct();
        if ($this->hasData(self::PARAM_CONTROLLER)) {
            $this->_controller = $this->_getData(self::PARAM_CONTROLLER);
        }
        if ($this->hasData(self::PARAM_HEADER_TEXT)) {
            $this->_headerText = $this->_getData(self::PARAM_HEADER_TEXT);
        }
    }

    public function addButton($buttonId, $data, $level = 0, $sortOrder = 0, $region = 'toolbar')
    {
        $this->buttonList->add($buttonId, $data, $level, $sortOrder, $region);
        return $this;
    }

    public function removeButton($buttonId)
    {
        $this->buttonList->remove($buttonId);
        return $this;
    }

    public function updateButton($buttonId, $key, $data)
    {
        $this->buttonList->update($buttonId, $key, $data);
        return $this;
    }

    protected function _prepareLayout()
    {
        $this->toolbar->pushButtons($this, $this->buttonList);
        return parent::_prepareLayout();
    }

    public function getButtonsHtml($region = null)
    {
        $out = '';
        foreach ($this->buttonList->getItems() as $buttons) {
            foreach ($buttons as $item) {
                if ($region && $region != $item->getRegion()) {
                    continue;
                }
                $out .= $this->getChildHtml($item->getButtonKey());
            }
        }
        return $out;
    }

    public function getHeaderText()
    {
        return $this->_headerText;
    }

    public function getHeaderCssClass()
    {
        return 'head-' . strtr($this->_controller, '_', '-');
    }

    public function getHeaderHtml()
    {
        return '<h3 class="' . $this->getHeaderCssClass() . '">' . $this->getHeaderText() . '</h3>';
    }

    public function hasFooterButtons()
    {
        foreach ($this->buttonList->getItems() as $buttons) {
            foreach ($buttons as $data) {
                if (isset($data['region']) && 'footer' == $data['region']) {
                    return true;
                }
            }
        }
        return false;
    }

    public function canRender(Button\Item $item)
    {
        return !$item->isDeleted();
    }
}