如何在TYPO3 / TCA覆盖中内联来自tt_content的包含标题、正文、图像的自定义内容元素？

// Step 3: Add a new element type
$GLOBALS['TCA']['tt_content']['types']['custom_element'] = [
    'showitem' => '
        --palette--;;general,
        header; Custom Element Header,
        bodytext; Custom Element Bodytext,
        image; Custom Element Image,
    ',
];

// Step 4: Add new fields for custom element
$GLOBALS['TCA']['tt_content']['columns']['header'] = [
    'label' => 'Custom Element Header',
    'config' => [
        'type' => 'input',
        'size' => 30,
    ],
];
$GLOBALS['TCA']['tt_content']['columns']['bodytext'] = [
    'label' => 'Custom Element Bodytext',
    'config' => [
        'type' => 'text',
        'cols' => 40,
        'rows' => 15,
    ],
];
$GLOBALS['TCA']['tt_content']['columns']['image'] = [
    'label' => 'Custom Element Image',
    'config' => \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::getFileFieldTCAConfig(
        'image',
        ['maxitems' => 1],
        $GLOBALS['TYPO3_CONF_VARS']['GFX']['imagefile_ext']
    ),
];

// Step 5: Define image processing and upload rules
$GLOBALS['TCA']['tt_content']['columns']['image']['config']['foreign_types'] = [
    '0' => [
        'showitem' => '
            --palette--;;filePalette,
        ',
    ],
    \TYPO3\CMS\Core\Resource\File::FILETYPE_IMAGE => [
        'showitem' => '
            --palette--;;filePalette,
            --palette--;;imageoverlayPalette,
        ',
    ],
];

// Step 6: Add image field to palettes
$GLOBALS['TCA']['tt_content']['palettes']['filePalette'] = [
    'showitem' => 'file_external,',
];
$GLOBALS['TCA']['tt_content']['palettes']['imageoverlayPalette'] = [
    'showitem' => 'image_link, --linebreak--,
                    image_zoom, image_noWrap, image_effects',
];

// Step 7: Add form fields for new element type
$GLOBALS['TCA']['tt_content']['types']['custom_element']['showitem'] .= '
    --div--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xlf:tabs.appearance,
    --palette--;;frames,
    --palette--;;appearanceLinks,
    --div--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xlf:tabs.access,
    --palette--;;hidden,
    --palette--;;access,
    --div--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xlf:tabs.extended,
';

// Step 8: Define display options for new element type
$GLOBALS['TCA']['tt_content']['types']['custom_element']['columnsOverrides'] = [
    'image' => [
        'config' => [
            'maxitems' => 1,
        ],
    ],
];

// Step 9: Add icon for new element type
\TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Imaging\IconRegistry::class)
    ->registerIcon(
        'content-custom_element',
        \TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider::class,
        ['source' => 'EXT:your_extension/Resources/Public/Icons/CustomElement.svg']
    );
$GLOBALS['TCA']['tt_content']['ctrl']['typeicon_classes']['custom_element'] = 'content-custom_element';