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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\Strategy;
use Zend\EventManager\AbstractListenerAggregate;
use Zend\EventManager\EventManagerInterface;
use Zend\View\Renderer\PhpRenderer;
use Zend\View\ViewEvent;
class PhpRendererStrategy extends AbstractListenerAggregate
{
/**
* Placeholders that may hold content
*
* @var array
*/
protected $contentPlaceholders = ['article', 'content'];
/**
* @var PhpRenderer
*/
protected $renderer;
/**
* Constructor
*
* @param PhpRenderer $renderer
*/
public function __construct(PhpRenderer $renderer)
{
$this->renderer = $renderer;
}
/**
* Retrieve the composed renderer
*
* @return PhpRenderer
*/
public function getRenderer()
{
return $this->renderer;
}
/**
* Set list of possible content placeholders
*
* @param array $contentPlaceholders
* @return PhpRendererStrategy
*/
public function setContentPlaceholders(array $contentPlaceholders)
{
$this->contentPlaceholders = $contentPlaceholders;
return $this;
}
/**
* Get list of possible content placeholders
*
* @return array
*/
public function getContentPlaceholders()
{
return $this->contentPlaceholders;
}
/**
* {@inheritDoc}
*/
public function attach(EventManagerInterface $events, $priority = 1)
{
$this->listeners[] = $events->attach(ViewEvent::EVENT_RENDERER, [$this, 'selectRenderer'], $priority);
$this->listeners[] = $events->attach(ViewEvent::EVENT_RESPONSE, [$this, 'injectResponse'], $priority);
}
/**
* Select the PhpRenderer; typically, this will be registered last or at
* low priority.
*
* @param ViewEvent $e
* @return PhpRenderer
*/
public function selectRenderer(ViewEvent $e)
{
return $this->renderer;
}
/**
* Populate the response object from the View
*
* Populates the content of the response object from the view rendering
* results.
*
* @param ViewEvent $e
* @return void
*/
public function injectResponse(ViewEvent $e)
{
$renderer = $e->getRenderer();
$response = $e->getResponse();
if ($renderer !== $this->renderer || $response === null) {
return;
}
$result = $e->getResult();
// Set content
// If content is empty, check common placeholders to determine if they are
// populated, and set the content from them.
if (empty($result)) {
$placeholders = $renderer->plugin('placeholder');
foreach ($this->contentPlaceholders as $placeholder) {
if ($placeholders->containerExists($placeholder)) {
$result = (string) $placeholders->getContainer($placeholder);
break;
}
}
}
$response->setContent($result);
}
}