VITEC-website/packages/vitec/Classes/View/BackendLayoutDataProvider.php

<?php
declare(strict_types=1);

namespace Evomedien\Vitec\View;

use TYPO3\CMS\Backend\View\BackendLayout\BackendLayout;
use TYPO3\CMS\Backend\View\BackendLayout\BackendLayoutCollection;
use TYPO3\CMS\Backend\View\BackendLayout\DataProviderContext;
use TYPO3\CMS\Backend\View\BackendLayout\DataProviderInterface;

/**
 * Provides one Backend Layout per VITEC frontend layout (pages.layout 0..20).
 *
 * Backend layout identifiers are the plain layout values: '0', '1', ... '20'.
 * Combined with the provider id 'vitec' (registered in ext_localconf.php) this
 * yields the standard combined identifier scheme  vitec__<value>.
 *
 * The layout's title is shown above the page module and tells the editor
 * which frontend layout is currently active.
 */
final class BackendLayoutDataProvider implements DataProviderInterface
{
    /** colPos values across all VITEC backend layouts.
     *  Must NOT collide with container child colPos (>= 211). */
    private const COL_POS = [
        'main'      => 0,
        'hero'      => 1,
        'sidebar'   => 2,
        'preFooter' => 3,
    ];

    /** Per-frontend-layout: title + ordered list of zones. */
    public const LAYOUT_MAP = [
        0  => ['title' => 'Default',                'zones' => ['main']],
        1  => ['title' => 'Index Page',             'zones' => ['hero', 'main', 'preFooter']],
        2  => ['title' => 'Markets Overview',       'zones' => ['hero', 'main']],
        3  => ['title' => 'Market Detail',          'zones' => ['hero', 'main', 'sidebar']],
        4  => ['title' => 'Solutions Overview',     'zones' => ['hero', 'main']],
        5  => ['title' => 'Solution Detail',        'zones' => ['hero', 'main', 'sidebar']],
        6  => ['title' => 'Use Cases Overview',     'zones' => ['hero', 'main']],
        7  => ['title' => 'Use Case Detail',        'zones' => ['hero', 'main', 'sidebar']],
        8  => ['title' => 'Products Overview',      'zones' => ['hero', 'main']],
        9  => ['title' => 'Product Main Category',  'zones' => ['hero', 'main', 'preFooter']],
        10 => ['title' => 'Product Detail',         'zones' => ['hero', 'main', 'sidebar']],
        11 => ['title' => 'Support Overview',       'zones' => ['hero', 'main']],
        12 => ['title' => 'News Overview',          'zones' => ['hero', 'main']],
        13 => ['title' => 'News Detail V1',         'zones' => ['hero', 'main', 'sidebar']],
        14 => ['title' => 'News Detail V2',         'zones' => ['hero', 'main']],
        15 => ['title' => 'News Detail V3',         'zones' => ['hero', 'main', 'sidebar', 'preFooter']],
        16 => ['title' => 'Content Page V1',        'zones' => ['hero', 'main']],
        17 => ['title' => 'Content Page V2',        'zones' => ['hero', 'main', 'sidebar']],
        18 => ['title' => 'Content Page V3',        'zones' => ['hero', 'main', 'sidebar', 'preFooter']],
        19 => ['title' => 'Events Overview',        'zones' => ['hero', 'main']],
        20 => ['title' => 'Contact Page',           'zones' => ['hero', 'main', 'sidebar']],
    ];

    /** Display name for each zone. Shown as column header in the BE page module. */
    private const ZONE_NAMES = [
        'main'      => 'Main Content',
        'hero'      => 'Hero',
        'sidebar'   => 'Sidebar',
        'preFooter' => 'Pre-Footer',
    ];

    public function addBackendLayouts(DataProviderContext $dataProviderContext, BackendLayoutCollection $backendLayoutCollection)
    {
        foreach (self::LAYOUT_MAP as $value => $info) {
            $backendLayoutCollection->add($this->buildBackendLayout((int)$value, $info['title'], $info['zones']));
        }
    }

    public function getBackendLayout($identifier, $pageId)
    {
        $value = (int)$identifier;
        if (!isset(self::LAYOUT_MAP[$value])) {
            return null;
        }
        $info = self::LAYOUT_MAP[$value];
        return $this->buildBackendLayout($value, $info['title'], $info['zones']);
    }

    /**
     * @param string[] $zones
     */
    private function buildBackendLayout(int $value, string $title, array $zones): BackendLayout
    {
        $rowsTs = '';
        $rowNum = 1;
        foreach ($zones as $zoneKey) {
            $name = self::ZONE_NAMES[$zoneKey];
            $colPos = self::COL_POS[$zoneKey];
            $rowsTs .= <<<TS
                                {$rowNum} {
                                    columns {
                                        1 {
                                            name = {$name}
                                            colPos = {$colPos}
                                        }
                                    }
                                }

TS;
            $rowNum++;
        }
        $rowCount = count($zones);
        $configuration = <<<TS
            backend_layout {
                colCount = 1
                rowCount = {$rowCount}
                rows {
{$rowsTs}                }
            }
TS;

        // Identifier is plain numeric; combined form becomes "vitec__<value>"
        return new BackendLayout(
            (string)$value,
            'VITEC Layout: ' . $title,
            $configuration
        );
    }
}