Widget.php

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<?php
namespace Magento\Backend\Block;

class Widget extends \Magento\Backend\Block\Template
{
    public function getId()
    {
        if (null === $this->getData('id')) {
            $this->setData('id', $this->mathRandom->getUniqueHash('id_'));
        }
        return $this->getData('id');
    }

    public function getSuffixId($suffix)
    {
        return "{$this->getId()}_{$suffix}";
    }

    public function getHtmlId()
    {
        return $this->getId();
    }

    public function getCurrentUrl($params = [])
    {
        if (!isset($params['_current'])) {
            $params['_current'] = true;
        }
        return $this->getUrl('*/*/*', $params);
    }

    protected function _addBreadcrumb($label, $title = null, $link = null)
    {
        $this->getLayout()->getBlock('breadcrumbs')->addLink($label, $title, $link);
    }

    public function getButtonHtml($label, $onclick, $class = '', $buttonId = null, $dataAttr = [])
    {
        return $this->getLayout()->createBlock(
            \Magento\Backend\Block\Widget\Button::class
        )->setData(
            ['label' => $label, 'onclick' => $onclick, 'class' => $class, 'type' => 'button', 'id' => $buttonId]
        )->setDataAttribute(
            $dataAttr
        )->toHtml();
    }
}