ActionContainerForm.php

<?php

namespace Drupal\rules\Form\Expression;

use Drupal\Core\Form\FormStateInterface;
use Drupal\rules\Engine\ActionExpressionContainerInterface;

/**
 * Form handler for action containers.
 */
class ActionContainerForm extends ExpressionContainerFormBase {
    
    /**
     * The rule expression object this form is for.
     *
     * @var \Drupal\rules\Engine\ActionExpressionContainerInterface
     */
    protected $actionSet;
    
    /**
     * Creates a new object of this class.
     */
    public function __construct(ActionExpressionContainerInterface $action_set) {
        $this->actionSet = $action_set;
    }
    
    /**
     * {@inheritdoc}
     */
    public function form(array $form, FormStateInterface $form_state) {
        $form['actions-table'] = [
            '#type' => 'container',
            '#attributes' => [
                'class' => [
                    'edit-actions-table',
                ],
            ],
        ];
        $form['actions-table']['actions'] = [
            '#type' => 'table',
            '#header' => [
                'element' => $this->t('Actions'),
                'operations' => $this->t('Operations'),
                'weight' => [
                    'data' => $this->t('List position'),
                    'class' => [
                        'tabledrag-hide',
                    ],
                ],
            ],
            '#tabledrag' => [
                [
                    'action' => 'order',
                    'relationship' => 'sibling',
                    'group' => 'table-sort-weight',
                ],
            ],
            '#empty' => $this->t('None'),
        ];
        
        /** @var \Drupal\rules\Engine\ExpressionInterface $action */
        foreach ($this->actionSet as $action) {
            $uuid = $action->getUuid();
            $configuration = $action->getConfiguration();
            $description = $this->getParameterDescription($configuration);
            $form['actions-table']['actions'][$uuid] = [
                'element' => [
                    'data' => [
                        '#type' => 'item',
                        '#plain_text' => $action->getLabel(),
                        '#suffix' => '<div class="description">' . $description . '</div>',
                    ],
                    // So that the full parameter description will show on hover.
'#wrapper_attributes' => [
                        'title' => [
                            $description,
                        ],
                    ],
                ],
                'operations' => [
                    'data' => [
                        '#type' => 'operations',
                        '#links' => [
                            'edit' => [
                                'title' => $this->t('Edit'),
                                'url' => $this->getRulesUiHandler()
                                    ->getUrlFromRoute('expression.edit', [
                                    'uuid' => $uuid,
                                ]),
                            ],
                            'delete' => [
                                'title' => $this->t('Delete'),
                                'url' => $this->getRulesUiHandler()
                                    ->getUrlFromRoute('expression.delete', [
                                    'uuid' => $uuid,
                                ]),
                            ],
                        ],
                    ],
                ],
                'weight' => [
                    '#type' => 'weight',
                    '#delta' => 50,
                    '#attributes' => [
                        'class' => [
                            'table-sort-weight',
                        ],
                    ],
                    '#default_value' => $action->getWeight(),
                ],
                '#attributes' => [
                    'class' => [
                        'draggable',
                    ],
                ],
                '#weight' => $action->getWeight(),
            ];
        }
        // Put action buttons in the table footer.
        $links['add-action'] = [
            '#theme' => 'menu_local_action',
            '#link' => [
                'title' => $this->t('Add action'),
                'url' => $this->getRulesUiHandler()
                    ->getUrlFromRoute('expression.add', [
                    'expression_id' => 'rules_action',
                ]),
            ],
        ];
        $form['actions-table']['actions']['#footer'][] = [
            [
                'data' => [
                    '#prefix' => '<ul class="action-links">',
                    'local-action-links' => $links,
                    '#suffix' => '</ul>',
                ],
                'colspan' => 3,
            ],
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        $values = $form_state->getValue('actions', []);
        if (empty($values)) {
            // Core FormState::getValue() doesn't return the default parameter []
            // when there are no values?
            return;
        }
        $component = $this->getRulesUiHandler()
            ->getComponent();
        
        /** @var \Drupal\rules\Plugin\RulesExpression\RuleExpression $rule_expression */
        $rule_expression = $component->getExpression();
        foreach ($values as $uuid => $expression) {
            $action = $rule_expression->getExpression($uuid);
            $action->setWeight($expression['weight']);
            $action->setConfiguration($action->getConfiguration());
        }
        $this->getRulesUiHandler()
            ->updateComponent($component);
    }

}