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Creating custom RichText blocks

To create a RichText custom Page block, you need to define its layout, provide templates, add a subscriber and register it as a service.

Start with providing the block configuration in config/packages/ezplatform_page_fieldtype.yaml:

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ezplatform_page_fieldtype:
    blocks:
        my_block:
            name: My Richtext Block
            thumbnail: assets/images/blocks/richtext_block_icon.svg
            configuration_template: blocks/my_block/config.html.twig
            views:
                default:
                    template: blocks/my_block/default.html.twig
                    name: My block view
                    priority: -255                    
            attributes:
                content:
                    name: Content
                    type: richtext

This configuration defines a new block, its view and configuration templates, and attribute type richtext (line 15). Remember to provide an icon for the block in the assets/images/blocks/ folder.

Next, create a subscriber that converts a string of data into XML. Create a src/Event/Subscriber/RichTextBlockSubscriber.php file containing:

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<?php

declare(strict_types=1);

namespace App\Event\Subscriber;

use EzSystems\EzPlatformRichText\eZ\RichText\DOMDocumentFactory;
use EzSystems\EzPlatformPageFieldType\FieldType\Page\Block\Renderer\BlockRenderEvents;
use EzSystems\EzPlatformPageFieldType\FieldType\Page\Block\Renderer\Event\PreRenderEvent;
use EzSystems\EzPlatformPageFieldType\FieldType\Page\Block\Renderer\Twig\TwigRenderRequest;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

class RichTextBlockSubscriber implements EventSubscriberInterface
{
    /** @var \EzSystems\EzPlatformRichText\eZ\RichText\DOMDocumentFactory */
    private $domDocumentFactory;

    /**
     * @param \EzSystems\EzPlatformRichText\eZ\RichText\DOMDocumentFactory $domDocumentFactory
     */
    public function __construct(DOMDocumentFactory $domDocumentFactory)
    {
        $this->domDocumentFactory = $domDocumentFactory;
    }

    /**
     * {@inheritdoc}
     */
    public static function getSubscribedEvents(): array
    {
        return [
            BlockRenderEvents::getBlockPreRenderEventName('my_block') => 'onBlockPreRender',
        ];
    }

    /**
     * @param \EzSystems\EzPlatformPageFieldType\FieldType\Page\Block\Renderer\Event\PreRenderEvent $event
     */
    public function onBlockPreRender(PreRenderEvent $event): void
    {
        $renderRequest = $event->getRenderRequest();
        if (!$renderRequest instanceof TwigRenderRequest) {
            return;
        }
        $parameters = $renderRequest->getParameters();
        $parameters['document'] = null;
        $xml = $event->getBlockValue()->getAttribute('content')->getValue();
        if (!empty($xml)) {
            $parameters['document'] = $this->domDocumentFactory->loadXMLString($xml);
        }
        $renderRequest->setParameters($parameters);
    }
 }

Note that in the line 32, my_block is the name of the block defined in the ezplatform_page_fieldtype.yaml file (line 3). This line also implements the PreRender method. Lines 41-51 handle the conversion of content into XML string.

At this point you need to create templates for displaying and configuring your block.

Start with creating the view template in templates/blocks/my_block/richtext.html.twig:

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<div class="block-richtext {{ block_class }}">
            {{ document | ez_richtext_to_html5 }}
</div>
Here, line 2 is responsible for rendering the content from XML to HTML5.

Proceed with creating a separate templates/blocks/my_block/config.html.twig template:

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{% extends '@EzPlatformPageBuilder/page_builder/block/config.html.twig' %}

{% block meta %}
    {{ parent() }}
    <meta name="LanguageCode" content="{{ language_code }}" />
{% endblock %}

Complete the procedure with registering the subscriber as a service in config/services.yaml:

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services:
    App\Event\Subscriber\RichTextBlockSubscriber:
        tags:
            - { name: kernel.event_subscriber }

Now, you can add your custom RichText block in the Site tab.

RichText block

For details on customizing additional options of the block or creating custom blocks with other attribute types, see Create custom Page block.