class SetCustomize

class SetCustomize extends EntityForm {
  
  /**
   * The entity being used by this form.
   *
   * @var \Drupal\shortcut\ShortcutSetInterface
   */
  protected $entity;
  
  /**
   * {@inheritdoc}
   */
  public function form(array $form, FormStateInterface $form_state) {
    $form = parent::form($form, $form_state);
    $form['shortcuts'] = [
      '#tree' => TRUE,
      '#weight' => -20,
    ];
    $form['shortcuts']['links'] = [
      '#type' => 'table',
      '#header' => [
        $this->t('Name'),
        $this->t('Weight'),
        $this->t('Operations'),
      ],
      '#empty' => $this->t('No shortcuts available. <a href=":link">Add a shortcut</a>', [
        ':link' => Url::fromRoute('shortcut.link_add', [
          'shortcut_set' => $this->entity
            ->id(),
        ])
          ->toString(),
      ]),
      '#attributes' => [
        'id' => 'shortcuts',
      ],
      '#tabledrag' => [
        [
          'action' => 'order',
          'relationship' => 'sibling',
          'group' => 'shortcut-weight',
        ],
      ],
    ];
    foreach ($this->entity
      ->getShortcuts() as $shortcut) {
      $id = $shortcut->id();
      $url = $shortcut->getUrl();
      if (!$url->access()) {
        continue;
      }
      $form['shortcuts']['links'][$id]['#attributes']['class'][] = 'draggable';
      $form['shortcuts']['links'][$id]['name'] = [
        '#type' => 'link',
        '#title' => $shortcut->getTitle(),
      ] + $url->toRenderArray();
      unset($form['shortcuts']['links'][$id]['name']['#access_callback']);
      $form['shortcuts']['links'][$id]['#weight'] = $shortcut->getWeight();
      $form['shortcuts']['links'][$id]['weight'] = [
        '#type' => 'weight',
        '#title' => $this->t('Weight for @title', [
          '@title' => $shortcut->getTitle(),
        ]),
        '#title_display' => 'invisible',
        '#default_value' => $shortcut->getWeight(),
        '#attributes' => [
          'class' => [
            'shortcut-weight',
          ],
        ],
      ];
      $links['edit'] = [
        'title' => $this->t('Edit'),
        'url' => $shortcut->toUrl(),
      ];
      $links['delete'] = [
        'title' => $this->t('Delete'),
        'url' => $shortcut->toUrl('delete-form'),
      ];
      $form['shortcuts']['links'][$id]['operations'] = [
        '#type' => 'operations',
        '#links' => $links,
        '#access' => $url->access(),
      ];
    }
    return $form;
  }
  
  /**
   * {@inheritdoc}
   */
  protected function actions(array $form, FormStateInterface $form_state) {
    // Only includes a Save action for the entity, no direct Delete button.
    return [
      'submit' => [
        '#type' => 'submit',
        '#value' => $this->t('Save'),
        '#access' => (bool) Element::getVisibleChildren($form['shortcuts']['links']),
        '#submit' => [
          '::submitForm',
          '::save',
        ],
      ],
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function save(array $form, FormStateInterface $form_state) {
    foreach ($this->entity
      ->getShortcuts() as $shortcut) {
      $weight = $form_state->getValue([
        'shortcuts',
        'links',
        $shortcut->id(),
        'weight',
      ]);
      $shortcut->setWeight($weight);
      $shortcut->save();
    }
    $this->messenger()
      ->addStatus($this->t('The shortcut set has been updated.'));
  }

}