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<?php
namespace Laminas\Mvc\View\Http;
use Laminas\EventManager\AbstractListenerAggregate;
use Laminas\EventManager\EventManagerInterface as Events;
use Laminas\Mvc\MvcEvent;
use Laminas\View\Model\ClearableModelInterface;
use Laminas\View\Model\ModelInterface as ViewModel;
class InjectViewModelListener extends AbstractListenerAggregate
{
/**
* {@inheritDoc}
*/
public function attach(Events $events, $priority = 1)
{
$this->listeners[] = $events->attach(MvcEvent::EVENT_DISPATCH, [$this, 'injectViewModel'], -100);
$this->listeners[] = $events->attach(MvcEvent::EVENT_DISPATCH_ERROR, [$this, 'injectViewModel'], -100);
$this->listeners[] = $events->attach(MvcEvent::EVENT_RENDER_ERROR, [$this, 'injectViewModel'], -100);
}
/**
* Insert the view model into the event
*
* Inspects the MVC result; if it's a view model, it then either (a) adds
* it as a child to the default, composed view model, or (b) replaces it
* if the result is marked as terminable.
*
* @param MvcEvent $e
* @return void
*/
public function injectViewModel(MvcEvent $e)
{
$result = $e->getResult();
if (! $result instanceof ViewModel) {
return;
}
$model = $e->getViewModel();
if ($result->terminate()) {
$e->setViewModel($result);
return;
}
if ($e->getError() && $model instanceof ClearableModelInterface) {
$model->clearChildren();
}
$model->addChild($result);
}
}