ThemeDependencyChecker.php

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<?php
namespace Magento\Theme\Model\Theme;

use Magento\Theme\Model\Theme\Data\Collection as ThemeCollection;

class ThemeDependencyChecker
{
    private $themeCollection;

    private $themeProvider;

    private $themePackageInfo;

    public function __construct(
        ThemeCollection $themeCollection,
        ThemeProvider $themeProvider,
        ThemePackageInfo $themePackageInfo
    ) {
        $this->themeCollection = $themeCollection;
        $this->themeProvider = $themeProvider;
        $this->themePackageInfo = $themePackageInfo;
    }

    public function checkChildThemeByPackagesName($packages)
    {
        $themePaths = [];
        foreach ($packages as $package) {
            $themePath = $this->themePackageInfo->getFullThemePath($package);
            if ($themePath) {
                $themePaths[] = $themePath;
            }
        }
        if ($themePaths) {
            return $this->checkChildTheme($themePaths);
        }

        return [];
    }

    public function checkChildTheme($themePaths)
    {
        $messages = [];
        $themeHasVirtualChildren = [];
        $themeHasPhysicalChildren = [];
        $parentChildMap = $this->getParentChildThemeMap();
        foreach ($themePaths as $themePath) {
            $theme = $this->themeProvider->getThemeByFullPath($themePath);
            if ($theme->hasChildThemes()) {
                $themeHasVirtualChildren[] = $themePath;
            }
            if (isset($parentChildMap[$themePath])) {
                $themeHasPhysicalChildren[] = $themePath;
            }
        }
        if (!empty($themeHasVirtualChildren)) {
            $text = count($themeHasVirtualChildren) > 1 ? ' are parents of' : ' is a parent of';
            $messages[] = implode(', ', $themeHasVirtualChildren) . $text . ' virtual theme.'
                . ' Parent themes cannot be uninstalled.';
        }
        if (!empty($themeHasPhysicalChildren)) {
            $text = count($themeHasPhysicalChildren) > 1 ? ' are parents of' : ' is a parent of';
            $messages[] = implode(', ', $themeHasPhysicalChildren) . $text . ' physical theme.'
                . ' Parent themes cannot be uninstalled.';
        }
        return $messages;
    }

    private function getParentChildThemeMap()
    {
        $map = [];
        $this->themeCollection->resetConstraints();
        $this->themeCollection->clear();
        foreach ($this->themeCollection as $theme) {
            if ($theme->getParentTheme()) {
                $map[$theme->getParentTheme()->getFullPath()][] = $theme->getFullPath();
            }
        }
        return $map;
    }
}