VariantPluginCollection.php

<?php

namespace Drupal\ctools\Plugin;

use Drupal\Core\Plugin\DefaultLazyPluginCollection;

/**
 * Provides a collection of variants plugins.
 */
class VariantPluginCollection extends DefaultLazyPluginCollection {
    
    /**
     * {@inheritdoc}
     *
     * @return \Drupal\Core\Display\VariantInterface
     */
    public function &get($instance_id) {
        return parent::get($instance_id);
    }
    
    /**
     * {@inheritdoc}
     */
    public function sort() {
        // @todo Determine the reason this needs error suppression.
        @uasort($this->instanceIds, [
            $this,
            'sortHelper',
        ]);
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function sortHelper($aID, $bID) {
        $a_weight = $this->get($aID)
            ->getWeight();
        $b_weight = $this->get($bID)
            ->getWeight();
        if ($a_weight == $b_weight) {
            return strcmp($aID, $bID);
        }
        return $a_weight < $b_weight ? -1 : 1;
    }

}