addNewContentElement

##TYPOSCRIPT

tt_content {
    shufflemix_template_new_my_slider < lib.contentElement
    shufflemix_template_new_my_slider {
        templateName = MySlider
        dataProcessing {
            10 = TYPO3\CMS\Frontend\DataProcessing\FilesProcessor
            10.references.fieldName = assets
        }
    }
}


##PAGETS

mod.wizards.newContentElement.wizardItems.common {
    elements {
        shufflemix_template_new_my_Slider {
            iconIdentifier = content-carousel-image
            title = My Slider
            description = A content element to add one or more images
            tt_content_defValues.CType = shufflemix_template_new_my_slider
        }
    }
    show := addToList(shufflemix_template_new_my_slider)
}


##tt_content.php

<?php
defined('TYPO3_MODE') || die();

\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPlugin(
    array(
        'My slider',
        'shufflemix_template_new_my_slider',
        'EXT:core/Resources/Public/Icons/T3Icons/content/content-carousel-image.svg'
    ),
    'CType',
    'shufflemix_template_new'
);


##tt_content_my_slider.php

\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTcaSelectItem(
    'tt_content',
    'CType',
    [
        0 => 'My slider',
        1 => 'shufflemix_template_new_my_slider',
        2 => 'shufflemix-template-new-my-slider'
    ]
);

$GLOBALS['TCA']['tt_content']['types']['shufflemix_template_new_my_slider'] = [
    'showitem' => '
         --palette--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xml:palette.general;general,
         --palette--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xml:palette.header;header,
      --div--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xlf:tabs.media,assets,
      --div--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xlf:tabs.appearance,
        --palette--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xlf:palette.frames;frames,
        --palette--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xlf:palette.appearanceLinks;appearanceLinks,
      --div--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xml:tabs.access,
         --palette--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xml:palette.visibility;visibility,
         --palette--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xml:palette.access;access,
      --div--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xml:tabs.extended'
];

##constants_overwrites.txt

lib.contentElement {
    templateRootPaths.200 = EXT:shufflemix_template_new/Resources/Private/Templates/
    partialRootPaths.200 = EXT:shufflemix_template_new/Resources/Private/Partials/
    layoutRootPaths.200 = EXT:shufflemix_template_new/Resources/Private/Layout/
}


##sys_template.php
// Add an entry in the static template list found in sys_templates for static TS
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addStaticFile(
    'shufflemix_template_new',
    'Configuration/TypoScript',
    'My Slider'
);