Role.php

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<?php
namespace Magento\User\Block;

class Role extends \Magento\Backend\Block\Widget\Grid\Container
{
    protected $_controller = 'user_role';

    protected $_blockGroup = 'Magento_User';

    protected function _construct()
    {
        $this->_headerText = __('Roles');
        $this->_addButtonLabel = __('Add New Role');
        parent::_construct();
    }

    public function getCreateUrl()
    {
        return $this->getUrl('*/*/editrole');
    }

    protected function _prepareLayout()
    {
        if (!$this->getLayout()->getChildName($this->getNameInLayout(), 'grid')) {
            $this->setChild(
                'grid',
                $this->getLayout()->createBlock(
                    $this->_blockGroup . '\\Block\\Role\\Grid',
                    $this->_controller . '.grid'
                )->setSaveParametersInSession(
                    true
                )
            );
        }
        return \Magento\Backend\Block\Widget\Container::_prepareLayout();
    }

    protected function _toHtml()
    {
        $this->_eventManager->dispatch('permissions_role_html_before', ['block' => $this]);
        return parent::_toHtml();
    }
}