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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\View\Helper;
use Zend\View\Exception;
use Zend\View\Model\ModelInterface as Model;
/**
* View helper for retrieving layout object
*/
class Layout extends AbstractHelper
{
/**
* @var ViewModel
*/
protected $viewModelHelper;
/**
* Set layout template or retrieve "layout" view model
*
* If no arguments are given, grabs the "root" or "layout" view model.
* Otherwise, attempts to set the template for that view model.
*
* @param null|string $template
* @return Layout
*/
public function __invoke($template = null)
{
if (null === $template) {
return $this->getRoot();
}
return $this->setTemplate($template);
}
/**
* Get layout template
*
* @return string
*/
public function getLayout()
{
return $this->getRoot()->getTemplate();
}
/**
* Get the root view model
*
* @throws Exception\RuntimeException
* @return null|Model
*/
protected function getRoot()
{
$helper = $this->getViewModelHelper();
if (! $helper->hasRoot()) {
throw new Exception\RuntimeException(sprintf(
'%s: no view model currently registered as root in renderer',
__METHOD__
));
}
return $helper->getRoot();
}
/**
* Set layout template
*
* @param string $template
* @return Layout
*/
public function setTemplate($template)
{
$this->getRoot()->setTemplate((string) $template);
return $this;
}
/**
* Retrieve the view model helper
*
* @return ViewModel
*/
protected function getViewModelHelper()
{
if (null === $this->viewModelHelper) {
$this->viewModelHelper = $this->getView()->plugin('view_model');
}
return $this->viewModelHelper;
}
}