Source of file BuildingBlocksBlockExtension.php

<?php

class BuildingBlocksBlockExtension extends DataExtension

{

	private static $db = array(

		'Description' => 'Text',

		'TitleTag' => "Enum('h2,h3,h4,h5,h6,hidden','h2')",

		'SubTitle' => "Varchar(255)",

        'FxType' => "Varchar(40)",

        //'FxDefaultState' => "Varchar(40)"

	);

    public function updateCMSFields(\FieldList $fields) {

        $fields->removeByName('TitleTag');

		$fields->removeByName('SubTitle');

        $fields->removeByName('FxType');

        //$fields->removeByName('FxDefaultState');

		$titleTagOptions = $this->owner->dbObject('TitleTag')->enumValues();

		foreach($titleTagOptions as $k => $v) {

			$titleTagOptions[$k] = _t('BuildingBlocksBlockExtension.TitleTag-'. $k, $k);

		}

		$fields->addFieldToTab('Root.Main',DropdownField::create('TitleTag',_t('BuildingBlocksBlockExtension.TitleTag','Heading level'),$titleTagOptions),'Description');

		$fields->addFieldToTab('Root.Main',TextField::create('SubTitle',_t('BuildingBlocksBlockExtension.SubTitle','Subtitle')),'Description');

        $fields->replaceField('Description', TextareaField::create('Description',_t('BuildingBlocksBlockExtension.Description','Description (back end)')));

        // FX

        $fxTypes = Config::inst()->get(get_class($this->owner),'fx_types',Config::UNINHERITED);

        if(count($fxTypes)) {

            // Fx Options

            $fxTypeOptions = [];

            foreach($fxTypes as $fxType) {

                $fxTypeOptions[$fxType] = _t('BuildingBlocksBlockExtension.FxType-'. Convert::raw2att($fxType), ucfirst($fxType));

            }

            $fields->findOrMakeTab('Root.Effects',_t('BuildingBlocksBlockExtension.FxTab','Effects'));

            $fxTypeField = DropdownField::create('FxType',_t('BuildingBlocksBlockExtension.FxType','Effect type'),$fxTypeOptions)

                ->setHasEmptyDefault(true);

            $fields->addFieldToTab('Root.Effects',$fxTypeField);

            /** @todo

            $fxStates = ['active','inactive'];

            $fxStateOptions = [];

            foreach($fxStates as $fxState) {

                $fxStateOptions[$fxState] = _t('BuildingBlocksBlockExtension.FxState-'. Convert::raw2att($fxState), ucfirst($fxState));

            }

            $fxStateField = DropdownField::create('FxDefaultState',_t('BuildingBlocksBlockExtension.FxDefaultState','Default State'),$fxStateOptions)

                ->setHasEmptyDefault(true);

            $fields->addFieldToTab('Root.Effects',$fxStateField);

             * 

             */

        }

    }

    public function FxTypeClasses()

	{

        if(empty($this->owner->FxType)) {

            return '';

        }

		$class = 'bb-fx__'. Convert::raw2att($this->owner->FxType);

        /*if(!empty($this->owner->FxDefaultState)) {

            $class .= $class .'--'. Convert::raw2att($this->owner->FxDefaultState);

        }*/

        return $class;

	}

    public function FxTitleClass()

	{

        if(empty($this->owner->FxType)) {

            return '';

        }

        $type = Convert::raw2att($this->owner->FxType);

		return 'bb-fx__'. $type .'-title';

	}

}