ComplexTestTypeConfigureForm.php

<?php

namespace Drupal\workflow_type_test\Form;

use Drupal\Core\Form\FormStateInterface;
use Drupal\workflows\Plugin\WorkflowTypeConfigureFormBase;

/**
 * Form to configure the complex test workflow type.
 *
 * @see \Drupal\workflow_type_test\Plugin\WorkflowType\ComplexTestType
 */
class ComplexTestTypeConfigureForm extends WorkflowTypeConfigureFormBase {
    
    /**
     * {@inheritdoc}
     */
    public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
        $type_configuration = $this->workflowType
            ->getConfiguration();
        $form['example_setting'] = [
            '#type' => 'textfield',
            '#title' => $this->t('Example global workflow setting'),
            '#description' => $this->t('Extra information added to the workflow'),
            '#default_value' => $type_configuration['example_setting'],
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
        $type_configuration = $this->workflowType
            ->getConfiguration();
        $type_configuration['example_setting'] = $form_state->getValue('example_setting');
        $this->workflowType
            ->setConfiguration($type_configuration);
    }

}