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

class View implements ViewInterface
{
/**
* @var \Magento\Framework\View\LayoutInterface
*/
protected $_layout;

/**
* @var \Magento\Framework\Config\ScopeInterface
*/
protected $_configScope;

/**
* @var \Magento\Framework\Event\ManagerInterface
*/
protected $_eventManager;

/**
* @var \Magento\Framework\View\Result\Page
*/
protected $page;

/**
* @var ActionFlag
*/
protected $_actionFlag;

/**
* @var ResponseInterface
*/
protected $_response;

/**
* @var RequestInterface
*/
protected $_request;

/**
* @var bool
*/
protected $_isLayoutLoaded = false;

/**
* @param \Magento\Framework\View\LayoutInterface $layout
* @param RequestInterface $request
* @param ResponseInterface $response
* @param \Magento\Framework\Config\ScopeInterface $configScope
* @param \Magento\Framework\Event\ManagerInterface $eventManager
* @param \Magento\Framework\View\Result\PageFactory $pageFactory
* @param ActionFlag $actionFlag
*/
public function __construct(
\Magento\Framework\View\LayoutInterface $layout,
RequestInterface $request,
ResponseInterface $response,
\Magento\Framework\Config\ScopeInterface $configScope,
\Magento\Framework\Event\ManagerInterface $eventManager,
\Magento\Framework\View\Result\PageFactory $pageFactory,
ActionFlag $actionFlag
) {
$this->_layout = $layout;
$this->_request = $request;
$this->_response = $response;
$this->_configScope = $configScope;
$this->_eventManager = $eventManager;
$this->_actionFlag = $actionFlag;
$this->page = $pageFactory->create(true);
}

/**
* Retrieve current page object
*
* @return \Magento\Framework\View\Result\Page
*/
public function getPage()
{
return $this->page;
}

/**
* Retrieve current layout object
*
* @return \Magento\Framework\View\LayoutInterface
*/
public function getLayout()
{
return $this->page->getLayout();
}

/**
* {@inheritdoc}
*/
public function loadLayout($handles = null, $generateBlocks = true, $generateXml = true, $addActionHandles = true)
{
if ($this->_isLayoutLoaded) {
throw new \RuntimeException('Layout must be loaded only once.');
}
// if handles were specified in arguments load them first
if (!empty($handles)) {
$this->getLayout()->getUpdate()->addHandle($handles);
}

if ($addActionHandles) {
// add default layout handles for this action
$this->page->initLayout();
}
$this->loadLayoutUpdates();

if (!$generateXml) {
return $this;
}
$this->generateLayoutXml();

if (!$generateBlocks) {
return $this;
}
$this->generateLayoutBlocks();
$this->_isLayoutLoaded = true;

return $this;
}

/**
* Retrieve the default layout handle name for the current action
*
* @return string
*/
public function getDefaultLayoutHandle()
{
return $this->page->getDefaultLayoutHandle();
}

/**
* Add layout handle by full controller action name
*
* @return $this
*/
public function addActionLayoutHandles()
{
$this->getLayout()->getUpdate()->addHandle($this->getDefaultLayoutHandle());
return $this;
}

/**
* Add layout updates handles associated with the action page
*
* @param array|null $parameters page parameters
* @param string|null $defaultHandle
* @return bool
*/
public function addPageLayoutHandles(array $parameters = [], $defaultHandle = null)
{
return $this->page->addPageLayoutHandles($parameters, $defaultHandle);
}

/**
* Load layout updates
*
* @return $this
*/
public function loadLayoutUpdates()
{
$this->page->getConfig()->publicBuild();
return $this;
}

/**
* Generate layout xml
*
* @return $this
*/
public function generateLayoutXml()
{
$this->page->getConfig()->publicBuild();
return $this;
}

/**
* Generate layout blocks
*
* @return $this
*/
public function generateLayoutBlocks()
{
$this->page->getConfig()->publicBuild();
return $this;
}

/**
* Rendering layout
*
* @param string $output
* @return $this
*/
public function renderLayout($output = '')
{
if ($this->_actionFlag->get('', 'no-renderLayout')) {
return $this;
}

\Magento\Framework\Profiler::start('LAYOUT');

\Magento\Framework\Profiler::start('layout_render');

if ('' !== $output) {
$this->getLayout()->addOutputElement($output);
}

$this->_eventManager->dispatch('controller_action_layout_render_before');
$this->_eventManager->dispatch(
'controller_action_layout_render_before_' . $this->_request->getFullActionName()
);

$this->page->renderResult($this->_response);
\Magento\Framework\Profiler::stop('layout_render');

\Magento\Framework\Profiler::stop('LAYOUT');
return $this;
}

/**
* Set isLayoutLoaded flag
*
* @param bool $value
* @return void
*/
public function setIsLayoutLoaded($value)
{
$this->_isLayoutLoaded = $value;
}

/**
* Returns is layout loaded
*
* @return bool
*/
public function isLayoutLoaded()
{
return $this->_isLayoutLoaded;
}
}