CleanThemeRelatedContentObserver.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 CleanThemeRelatedContentObserver implements ObserverInterface
{
    protected $themeImageFactory;

    protected $updateCollection;

    protected $themeConfig;

    public function __construct(
        \Magento\Framework\View\Design\Theme\ImageFactory $themeImageFactory,
        \Magento\Widget\Model\ResourceModel\Layout\Update\Collection $updateCollection,
        \Magento\Theme\Model\Config\Customization $themeConfig
    ) {
        $this->themeImageFactory = $themeImageFactory;
        $this->updateCollection = $updateCollection;
        $this->themeConfig = $themeConfig;
    }

    public function execute(EventObserver $observer)
    {
        $theme = $observer->getEvent()->getData('theme');
        if (!($theme instanceof \Magento\Framework\View\Design\ThemeInterface)) {
            return;
        }
        if ($this->themeConfig->isThemeAssignedToStore($theme)) {
            throw new \Magento\Framework\Exception\LocalizedException(__('Theme isn\'t deletable.'));
        }
        $this->themeImageFactory->create(['theme' => $theme])->removePreviewImage();
        $this->updateCollection->addThemeFilter($theme->getId())->delete();
    }
}