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<?php
namespace Drupal\views;
use Drupal\Component\Plugin\Exception\PluginException;
use Drupal\Component\Plugin\PluginManagerInterface;
use Drupal\Core\Plugin\DefaultLazyPluginCollection;
/**
* A class which wraps the displays of a view so you can lazy-initialize them.
*/
class DisplayPluginCollection extends DefaultLazyPluginCollection {
/**
* Stores a reference to the view which has this displays attached.
*
* @var \Drupal\views\ViewExecutable
*/
protected $view;
/**
* {@inheritdoc}
*/
protected $pluginKey = 'display_plugin';
/**
* Constructs a DisplayPluginCollection object.
*
* @param \Drupal\views\ViewExecutable $view
* The view which has this displays attached.
* @param \Drupal\Component\Plugin\PluginManagerInterface $manager
* The manager to be used for instantiating plugins.
*/
public function __construct(ViewExecutable $view, PluginManagerInterface $manager) {
parent::__construct($manager, $view->storage->get('display'));
$this->view = $view;
$this->initializePlugin('default');
}
/**
* Destructs a DisplayPluginCollection object.
*/
public function __destruct() {
$this->clear();
}
/**
* {@inheritdoc}
*
* @return \Drupal\views\Plugin\views\display\DisplayPluginBase
*/
public function &get($instance_id) {
return parent::get($instance_id);
}
/**
* {@inheritdoc}
*/
public function clear() {
foreach (array_filter($this->pluginInstances) as $display) {
$display->destroy();
}
parent::clear();
}
/**
* {@inheritdoc}
*/
protected function initializePlugin($display_id) {
// Retrieve and initialize the new display handler with data.
$display = &$this->view->storage->getDisplay($display_id);
try {
$this->configurations[$display_id] = $display;
parent::initializePlugin($display_id);
}
// Catch any plugin exceptions that are thrown. So we can fail nicely if a
// display plugin isn't found.
catch (PluginException $e) {
$message = $e->getMessage();
drupal_set_message(t('@message', ['@message' => $message]), 'warning');
}
// If no plugin instance has been created, return NULL.
if (empty($this->pluginInstances[$display_id])) {
return NULL;
}
$this->pluginInstances[$display_id]->initDisplay($this->view, $display);
// If this is not the default display handler, let it know which is since
// it may well use some data from the default.
if ($display_id != 'default') {
$this->pluginInstances[$display_id]->default_display = $this->pluginInstances['default'];
}
}
/**
* {@inheritdoc}
*/
public function remove($instance_id) {
$this->get($instance_id)->remove();
parent::remove($instance_id);
}
}