Customization.php

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

class Customization
{
    protected $_storeManager;

    protected $_design;

    protected $themeProvider;

    protected $_assignedTheme;

    protected $_unassignedTheme;

    public function __construct(
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\View\DesignInterface $design,
        \Magento\Framework\View\Design\Theme\ThemeProviderInterface $themeProvider
    ) {
        $this->_storeManager = $storeManager;
        $this->_design = $design;
        $this->themeProvider = $themeProvider;
    }

    public function getAssignedThemeCustomizations()
    {
        if ($this->_assignedTheme === null) {
            $this->_prepareThemeCustomizations();
        }
        return $this->_assignedTheme;
    }

    public function getUnassignedThemeCustomizations()
    {
        if ($this->_unassignedTheme === null) {
            $this->_prepareThemeCustomizations();
        }
        return $this->_unassignedTheme;
    }

    public function getStoresByThemes()
    {
        $storesByThemes = [];
        $stores = $this->_storeManager->getStores();
        foreach ($stores as $store) {
            $themeId = $this->_getConfigurationThemeId($store);
            if (!isset($storesByThemes[$themeId])) {
                $storesByThemes[$themeId] = [];
            }
            $storesByThemes[$themeId][] = $store;
        }
        return $storesByThemes;
    }

    public function isThemeAssignedToStore($theme, $store = null)
    {
        if (null === $store) {
            $assignedThemes = $this->getAssignedThemeCustomizations();
            return isset($assignedThemes[$theme->getId()]);
        }
        return $this->_isThemeAssignedToSpecificStore($theme, $store);
    }

    public function hasThemeAssigned()
    {
        return count($this->getAssignedThemeCustomizations()) > 0;
    }

    protected function _isThemeAssignedToSpecificStore($theme, $store)
    {
        return $theme->getId() == $this->_getConfigurationThemeId($store);
    }

    protected function _getConfigurationThemeId($store)
    {
        return $this->_design->getConfigurationDesignTheme(
            \Magento\Framework\App\Area::AREA_FRONTEND,
            ['store' => $store]
        );
    }

    protected function _prepareThemeCustomizations()
    {
        $themeCollection = $this->themeProvider->getThemeCustomizations(\Magento\Framework\App\Area::AREA_FRONTEND);

        $assignedThemes = $this->getStoresByThemes();

        $this->_assignedTheme = [];
        $this->_unassignedTheme = [];

        foreach ($themeCollection as $theme) {
            if (isset($assignedThemes[$theme->getId()])) {
                $theme->setAssignedStores($assignedThemes[$theme->getId()]);
                $this->_assignedTheme[$theme->getId()] = $theme;
            } else {
                $this->_unassignedTheme[$theme->getId()] = $theme;
            }
        }

        return $this;
    }
}