DefaultDataProvider.php

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<?php
namespace TYPO3\CMS\Backend\View\BackendLayout;

use TYPO3\CMS\Backend\Utility\BackendUtility;

class DefaultDataProvider implements DataProviderInterface {

    public function addBackendLayouts(DataProviderContext $dataProviderContext, BackendLayoutCollection $backendLayoutCollection) {
        $layoutData = $this->getLayoutData(
            $dataProviderContext->getFieldName(),
            $dataProviderContext->getPageTsConfig(),
            $dataProviderContext->getPageId()
        );

        foreach ($layoutData as $data) {
            $backendLayout = $this->createBackendLayout($data);
            $backendLayoutCollection->add($backendLayout);
        }
    }

    public function getBackendLayout($identifier, $pageId) {
        $backendLayout = NULL;

        if ((string) $identifier === 'default') {
            return $this->createDefaultBackendLayout();
        }

        $data = $this->getDatabaseConnection()->exec_SELECTgetSingleRow(
            '*',
            'backend_layout',
            'uid=' . (int)$identifier . BackendUtility::BEenableFields('backend_layout') . BackendUtility::deleteClause('backend_layout')
        );
        if (is_array($data)) {
            $backendLayout = $this->createBackendLayout($data);
        }

        return $backendLayout;
    }

    protected function createDefaultBackendLayout() {
        return BackendLayout::create(
            'default',
            'LLL:EXT:cms/locallang_tca.xlf:pages.backend_layout.default',
            \TYPO3\CMS\Backend\View\BackendLayoutView::getDefaultColumnLayout()
        );
    }

    protected function createBackendLayout(array $data) {
        $backendLayout = BackendLayout::create($data['uid'], $data['title'], $data['config']);
        $backendLayout->setIconPath($this->getIconPath($data['icon']));
        $backendLayout->setData($data);
        return $backendLayout;
    }

    protected function getIconPath($icon) {
        $iconPath = '';

        if (!empty($icon)) {
            $path = rtrim($GLOBALS['TCA']['backend_layout']['ctrl']['selicon_field_path'], '/') . '/';
            $iconPath = '../' . $path . $icon;
        }

        return $iconPath;
    }

    protected function getLayoutData($fieldName, array $pageTsConfig, $pageUid) {
        $storagePid = $this->getStoragePid($pageTsConfig);
        $pageTsConfigId = $this->getPageTSconfigIds($pageTsConfig);

        // Add layout records
        $results = $this->getDatabaseConnection()->exec_SELECTgetRows(
            '*',
            'backend_layout',
                '(
                    ( ' . (int)$pageTsConfigId[$fieldName] . ' = 0 AND ' . (int)$storagePid . ' = 0 )
                    OR ( backend_layout.pid = ' . (int)$pageTsConfigId[$fieldName] . ' OR backend_layout.pid = ' . (int)$storagePid . ' )
                    OR ( ' . (int)$pageTsConfigId[$fieldName] . ' = 0 AND backend_layout.pid = ' . (int)$pageUid . ' )
                ) ' . BackendUtility::BEenableFields('backend_layout') . BackendUtility::deleteClause('backend_layout'),
            '',
            'sorting ASC'
        );

        if (!is_array($results)) {
            $results = array();
        }

        return $results;
    }

    protected function getStoragePid(array $pageTsConfig) {
        $storagePid = 0;

        if (!empty($pageTsConfig['TCEFORM.']['pages.']['_STORAGE_PID'])) {
            $storagePid = (int)$pageTsConfig['TCEFORM.']['pages.']['_STORAGE_PID'];
        }

        return $storagePid;
    }

    protected function getPageTSconfigIds(array $pageTsConfig) {
        $pageTsConfigIds = array(
            'backend_layout' => 0,
            'backend_layout_next_level' => 0,
        );

        if (!empty($pageTsConfig['TCEFORM.']['pages.']['backend_layout.']['PAGE_TSCONFIG_ID'])) {
            $pageTsConfigIds['backend_layout'] = (int)$pageTsConfig['TCEFORM.']['pages.']['backend_layout.']['PAGE_TSCONFIG_ID'];
        }

        if (!empty($pageTsConfig['TCEFORM.']['pages.']['backend_layout_next_level.']['PAGE_TSCONFIG_ID'])) {
            $pageTsConfigIds['backend_layout_next_level'] = (int)$pageTsConfig['TCEFORM.']['pages.']['backend_layout_next_level.']['PAGE_TSCONFIG_ID'];
        }

        return $pageTsConfigIds;
    }

    protected function getDatabaseConnection() {
        return $GLOBALS['TYPO3_DB'];
    }

}