ext_tables.php

<?php

if (!defined('TYPO3_MODE')) {
    die('Access denied.');
}


/** @var \TYPO3\CMS\Extbase\Object\ObjectManager $objectManager */
$objectManager = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\CMS\Extbase\Object\ObjectManager');

/** @var \TYPO3\CMS\Extensionmanager\Utility\ConfigurationUtility $configurationUtility */
$configurationUtility = $objectManager->get('TYPO3\CMS\Extensionmanager\Utility\ConfigurationUtility');
$extensionConfiguration = $configurationUtility->getCurrentConfiguration('themes');

/* allow inclusion of static typoscript file */
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addStaticFile($_EXTKEY, 'Configuration/TypoScript', 'Themes');
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addStaticFile($_EXTKEY, 'Configuration/TypoScript/FluidStyledContent', 'Themes (Experimental: Additional add this for using fluid_styled_content)');

unset($extensionConfiguration);


if (TYPO3_MODE === 'BE') {
    \TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerModule(
        'KayStrobach.'.$_EXTKEY, 'web', // Main area
        'mod1', // Name of the module
        '', // Position of the module
        [// Allowed controller action combinations
            'Editor' => 'index,update,showTheme,setTheme,showThemeDetails,saveCategoriesFilterSettings',
        ], [// Additional configuration
            'access'         => 'user,group',
            'iconIdentifier' => 'module-themes',
            'labels'         => 'LLL:EXT:'.$_EXTKEY.'/Resources/Private/Language/locallang.xml',
        ]
    );
    // Add some backend stylesheets and javascript
    $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_pagerenderer.php']['render-preProcess'][]
        = \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::extPath($_EXTKEY).'Classes/Hooks/PageRenderer.php:KayStrobach\\Themes\\Hooks\\PageRenderer->addJSCSS';
}

/*
 * add themes overlay
 */
    array_push($GLOBALS['TBE_STYLES']['spriteIconApi']['spriteIconRecordOverlayPriorities'], 'themefound');
    $GLOBALS['TBE_STYLES']['spriteIconApi']['spriteIconRecordOverlayNames']['themefound'] = 'extensions-themes-overlay-theme';

/*
 * add sprites
    \TYPO3\CMS\Backend\Sprite\SpriteManager::addSingleIcons(
        array(
            //'switch-off' => \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::extRelPath($_EXTKEY) . 'Resources/Public/Icons/power_orange.png',
            'switch-disable' => \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::extRelPath($_EXTKEY) . 'Resources/Public/Icons/power_grey.png',
            'switch-on' => \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::extRelPath($_EXTKEY) . 'Resources/Public/Icons/power_green.png',
            'contains-theme' => \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::extRelPath($_EXTKEY) . 'ext_icon.png',
        ),
        $_EXTKEY
    );
 */

\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::allowTableOnStandardPages('tx_themes_buttoncontent');

\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPlugin(
    [
        'LLL:EXT:themes/Resources/Private/Language/ButtonContent.xlf:tt_content.CType_pi1',
        $_EXTKEY.'_buttoncontent_pi1',
        \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::extRelPath($_EXTKEY).'buttoncontent_icon.gif',
    ],
    'CType'
);

// Register module icon
$iconRegistry = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Imaging\IconRegistry::class);
$iconRegistry->registerIcon(
    'module-themes',
    \TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider::class,
    [
        'source' => 'EXT:themes/ext_icon.svg',
    ]
);
$iconRegistry->registerIcon(
    'content-button',
    \TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider::class,
    [
        'source' => 'EXT:themes/Resources/Public/Icons/new_content_el_ButtonContent.svg',
    ]
);
$iconRegistry->registerIcon(
    'switch-off',
    \TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider::class,
    [
        'source' => 'EXT:themes/Resources/Public/Icons/power_grey.svg',
    ]
);
$iconRegistry->registerIcon(
    'switch-on',
    \TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider::class,
    [
        'source' => 'EXT:themes/Resources/Public/Icons/power_green.svg',
    ]
);
$iconRegistry->registerIcon(
    'switch-disable',
    \TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider::class,
    [
        'source' => 'EXT:themes/Resources/Public/Icons/power_orange.svg',
    ]
);
$iconRegistry->registerIcon(
    'overlay-theme',
    \TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider::class,
    [
        'source' => 'EXT:themes/Resources/Public/Icons/overlay_theme.svg',
    ]
);
$iconRegistry->registerIcon(
    'contains-theme',
    \TYPO3\CMS\Core\Imaging\IconProvider\BitmapIconProvider::class,
    [
        'source' => 'EXT:themes/ext_icon.png',
    ]
);

$GLOBALS['TCA']['pages']['columns']['module']['config']['items'][] =
        [
                0 => 'LLL:EXT:themes/Resources/Private/Language/locallang.xlf:contains-theme',
                1 => 'themes',
                2 => 'extensions-themes-contains-theme',
        ];

$GLOBALS['TCA']['pages']['ctrl']['typeicon_classes']['contains-themes'] = 'extensions-themes-contains-theme';