magento2/app/code/Magento/Backend/Block/Template.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

declare(strict_types=1);

namespace Magento\Backend\Block;

use Magento\Framework\App\ObjectManager;
use Magento\Framework\Json\Helper\Data as JsonHelper;
use Magento\Directory\Helper\Data as DirectoryHelper;

/**
 * Standard admin block. Adds admin-specific behavior and event.
 * Should be used when you declare a block in admin layout handle.
 *
 * Avoid extending this class if possible.
 *
 * If you need custom presentation logic in your blocks, use this class as block, and declare
 * custom view models in block arguments in layout handle file.
 *
 * Example:
 * <block name="my.block" class="Magento\Backend\Block\Template" template="My_Module::template.phtml" >
 *      <arguments>
 *          <argument name="view_model" xsi:type="object">My\Module\ViewModel\Custom</argument>
 *      </arguments>
 * </block>
 *
 * Your class object can then be accessed by doing $block->getViewModel()
 *
 * @api
 * @SuppressWarnings(PHPMD.NumberOfChildren)
 * @since 100.0.2
 */
class Template extends \Magento\Framework\View\Element\Template
{
    /**
     * @var \Magento\Framework\AuthorizationInterface
     */
    protected $_authorization;

    /**
     * @var \Magento\Framework\Math\Random
     */
    protected $mathRandom;

    /**
     * @var \Magento\Backend\Model\Session
     */
    protected $_backendSession;

    /**
     * @var \Magento\Framework\Data\Form\FormKey
     */
    protected $formKey;

    /**
     * @var \Magento\Framework\Code\NameBuilder
     */
    protected $nameBuilder;

    /**
     * @param \Magento\Backend\Block\Template\Context $context
     * @param array $data
     * @param JsonHelper|null $jsonHelper
     * @param DirectoryHelper|null $directoryHelper
     */
    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        array $data = [],
        ?JsonHelper $jsonHelper = null,
        ?DirectoryHelper $directoryHelper = null
    ) {
        $this->_localeDate = $context->getLocaleDate();
        $this->_authorization = $context->getAuthorization();
        $this->mathRandom = $context->getMathRandom();
        $this->_backendSession = $context->getBackendSession();
        $this->formKey = $context->getFormKey();
        $this->nameBuilder = $context->getNameBuilder();
        $data['jsonHelper'] = $jsonHelper ?? ObjectManager::getInstance()->get(JsonHelper::class);
        $data['directoryHelper']= $directoryHelper ?? ObjectManager::getInstance()->get(DirectoryHelper::class);
        parent::__construct($context, $data);
    }

    /**
     * Retrieve Session Form Key
     *
     * @return string
     */
    public function getFormKey()
    {
        return $this->formKey->getFormKey();
    }

    /**
     * Check whether or not the module output is enabled.
     *
     * Because many module blocks belong to Backend module,
     * the feature "Disable module output" doesn't cover Admin area.
     *
     * @param string $moduleName Full module name
     * @return boolean
     * @deprecated 100.2.0 Magento does not support disabling/enabling modules output from the Admin Panel since 2.2.0
     * version. Module output can still be enabled/disabled in configuration files. However, this functionality should
     * not be used in future development. Module design should explicitly state dependencies to avoid requiring output
     * disabling. This functionality will temporarily be kept in Magento core, as there are unresolved modularity
     * issues that will be addressed in future releases.
     */
    public function isOutputEnabled($moduleName = null)
    {
        if ($moduleName === null) {
            $moduleName = $this->getModuleName();
        }

        return !$this->_scopeConfig->isSetFlag(
            'advanced/modules_disable_output/' . $moduleName,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }

    /**
     * Make this public so that templates can use it properly with template engine
     *
     * @return \Magento\Framework\AuthorizationInterface
     */
    public function getAuthorization()
    {
        return $this->_authorization;
    }

    /**
     * Prepare html output
     *
     * @return string
     */
    protected function _toHtml()
    {
        $this->_eventManager->dispatch('adminhtml_block_html_before', ['block' => $this]);
        return parent::_toHtml();
    }

    /**
     * Return toolbar block instance
     *
     * @return bool|\Magento\Framework\View\Element\BlockInterface
     */
    public function getToolbar()
    {
        return $this->getLayout()->getBlock('page.actions.toolbar');
    }
}