Instance.php

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<?php
namespace Magento\Widget\Controller\Adminhtml\Widget;

abstract class Instance extends \Magento\Backend\App\Action
{
    const ADMIN_RESOURCE = 'Magento_Widget::widget_instance';

    protected $_coreRegistry;

    protected $_widgetFactory;

    protected $_logger;

    protected $mathRandom;

    protected $_translateInline;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\Registry $coreRegistry,
        \Magento\Widget\Model\Widget\InstanceFactory $widgetFactory,
        \Psr\Log\LoggerInterface $logger,
        \Magento\Framework\Math\Random $mathRandom,
        \Magento\Framework\Translate\InlineInterface $translateInline
    ) {
        $this->_translateInline = $translateInline;
        $this->_coreRegistry = $coreRegistry;
        $this->_widgetFactory = $widgetFactory;
        $this->_logger = $logger;
        $this->mathRandom = $mathRandom;
        parent::__construct($context);
    }

    protected function _initAction()
    {
        $this->_view->loadLayout();
        $this->_setActiveMenu(
            'Magento_Widget::cms_widget_instance'
        )->_addBreadcrumb(
            __('CMS'),
            __('CMS')
        )->_addBreadcrumb(
            __('Manage Widget Instances'),
            __('Manage Widget Instances')
        );
        return $this;
    }

    protected function _initWidgetInstance()
    {
        $widgetInstance = $this->_widgetFactory->create();

        $code = $this->getRequest()->getParam('code', null);
        $instanceId = $this->getRequest()->getParam('instance_id', null);
        if ($instanceId) {
            $widgetInstance->load($instanceId)->setCode($code);
            if (!$widgetInstance->getId()) {
                $this->messageManager->addError(__('Please specify a correct widget.'));
                return false;
            }
        } else {
            // Widget id was not provided on the query-string.  Locate the widget instance
            // type (namespace\classname) based upon the widget code (aka, widget id).
            $themeId = $this->getRequest()->getParam('theme_id', null);
            $type = $code != null ? $widgetInstance->getWidgetReference('code', $code, 'type') : null;
            $widgetInstance->setType($type)->setCode($code)->setThemeId($themeId);
        }
        $this->_coreRegistry->register('current_widget_instance', $widgetInstance);
        return $widgetInstance;
    }

    protected function setBody($body)
    {
        $this->_translateInline->processResponseBody($body);

        $this->getResponse()->setBody($body);
    }
}