CheckThemeIsAssignedObserver.php

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<?php
namespace Magento\Theme\Observer;

use Magento\Framework\Event\Observer as EventObserver;
use Magento\Framework\Event\ObserverInterface;
use Magento\Theme\Model\Theme;

class CheckThemeIsAssignedObserver implements ObserverInterface
{
    protected $themeConfig;

    protected $eventDispatcher;

    public function __construct(
        \Magento\Theme\Model\Config\Customization $themeConfig,
        \Magento\Framework\Event\ManagerInterface $eventDispatcher
    ) {
        $this->themeConfig = $themeConfig;
        $this->eventDispatcher = $eventDispatcher;
    }

    public function execute(EventObserver $observer)
    {
        $theme = $observer->getEvent()->getData('theme');
        if ($theme instanceof \Magento\Framework\View\Design\ThemeInterface) {
            if ($this->themeConfig->isThemeAssignedToStore($theme)) {
                $this->eventDispatcher->dispatch('assigned_theme_changed', ['theme' => $theme]);
            }
        }
    }
}