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class TableDragExampleRootLeafForm in Examples for Developers 8

Same name and namespace in other branches
  1. 3.x modules/tabledrag_example/src/Form/TableDragExampleRootLeafForm.php \Drupal\tabledrag_example\Form\TableDragExampleRootLeafForm

Table drag example root leaf form.

Tabledrag rows can be marked as roots or leaves. This limits the way the user can interact with them in drag-and-drop operations. We'll mark some rows this way and you can try dragging them around on the page to see how they are limited.

Hierarchy

Expanded class hierarchy of TableDragExampleRootLeafForm

Related topics

Example: Draggable Table Forms
1 string reference to 'TableDragExampleRootLeafForm'
tabledrag_example.routing.yml in tabledrag_example/tabledrag_example.routing.yml
tabledrag_example/tabledrag_example.routing.yml

File

tabledrag_example/src/Form/TableDragExampleRootLeafForm.php, line 21

Namespace

Drupal\tabledrag_example\Form
View source 
class TableDragExampleRootLeafForm extends FormBase {

  /**
   * The database connection.
   *
   * @var \Drupal\Core\Database\Connection
   */
  protected $database;

  /**
   * The renderer.
   *
   * @var \Drupal\Core\Render\RendererInterface
   */
  protected $render;

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container
      ->get('database'), $container
      ->get('renderer'));
  }

  /**
   * Construct a form.
   *
   * @param \Drupal\Core\Database\Connection $database
   *   The database connection.
   * @param \Drupal\Core\Render\RendererInterface $render
   *   The renderer.
   */
  public function __construct(Connection $database, RendererInterface $render) {
    $this->database = $database;
    $this->render = $render;
  }

  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'tabledrag_example_rootlead_form';
  }

  /**
   * Build the parent-child example form.
   *
   * Tabledrag will take care of updating the parent_id relationship on each
   * row of our table when we drag items around, but we need to build out the
   * initial tree structure ourselves. This means ordering our items such
   * that children items come directly after their parent items, and all items
   * are sorted by weight relative to their siblings.
   *
   * @param array $form
   *   Render array representing from.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   Current form state.
   *
   * @return array
   *   The render array defining the elements of the form.
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $form['description'] = [
      '#type' => 'item',
      '#markup' => $this
        ->t("Tabledrag rows can be marked as roots or leaves. This limits the way the user can interact with them in drag-and-drop operations. We'll mark some rows this way and you can try dragging them around on the page to see how they are limited."),
    ];
    $form['info'] = [
      '#markup' => '<ul>
        <li>' . $this
        ->t("Rows with the 'tabledrag-leaf' class cannot have child rows.") . '</li>
        <li>' . $this
        ->t("Rows with the 'tabledrag-root' class cannot be nested under a parent row.") . '</li></ul>',
    ];
    $form['table-row'] = [
      '#type' => 'table',
      '#header' => [
        $this
          ->t('Name'),
        $this
          ->t('Description'),
        $this
          ->t('Weight'),
        $this
          ->t('Parent'),
      ],
      '#empty' => $this
        ->t('Sorry, There are no items!'),
      // TableDrag: Each array value is a list of callback arguments for
      // drupal_add_tabledrag(). The #id of the table is automatically
      // prepended; if there is none, an HTML ID is auto-generated.
      '#tabledrag' => [
        [
          'action' => 'match',
          'relationship' => 'parent',
          'group' => 'row-pid',
          'source' => 'row-id',
          'hidden' => TRUE,
          /* hides the WEIGHT & PARENT tree columns below */
          'limit' => FALSE,
        ],
        [
          'action' => 'order',
          'relationship' => 'sibling',
          'group' => 'row-weight',
        ],
      ],
    ];

    // Build the table rows and columns.
    //
    // The first nested level in the render array forms the table row, on which
    // you likely want to set #attributes and #weight.
    // Each child element on the second level represents a table column cell in
    // the respective table row, which are render elements on their own. For
    // single output elements, use the table cell itself for the render element.
    // If a cell should contain multiple elements, simply use nested sub-keys to
    // build the render element structure for the renderer service as you would
    // everywhere else.
    $results = self::getData();
    foreach ($results as $row) {

      // TableDrag: Mark the table row as draggable.
      $form['table-row'][$row->id]['#attributes']['class'][] = 'draggable';

      // We can add the 'tabledrag-root' class to a row in order to indicate
      // that the row may not be nested under a parent row.  In our sample data
      // for this example, the description for the item with id '11' flags it as
      // a 'root' item which should not be nested.
      if ($row->id == '11') {
        $form['table-row'][$row->id]['#attributes']['class'][] = 'tabledrag-root';
      }

      // We can add the 'tabledrag-leaf' class to a row in order to indicate
      // that the row may not contain child rows.  In our sample data for this
      // example, the description for the item with id '12' flags it as a 'leaf'
      // item which can not contain child items.
      if ($row->id == '12') {
        $form['table-row'][$row->id]['#attributes']['class'][] = 'tabledrag-leaf';
      }

      // TableDrag: Sort the table row according to its existing/configured
      // weight.
      $form['table-row'][$row->id]['#weight'] = $row->weight;

      // Indent item on load.
      if (isset($row->depth) && $row->depth > 0) {
        $indentation = [
          '#theme' => 'indentation',
          '#size' => $row->depth,
        ];
      }

      // Some table columns containing raw markup.
      $form['table-row'][$row->id]['name'] = [
        '#markup' => $row->name,
        '#prefix' => !empty($indentation) ? $this->render
          ->render($indentation) : '',
      ];
      $form['table-row'][$row->id]['description'] = [
        '#type' => 'textfield',
        '#required' => TRUE,
        '#default_value' => $row->description,
      ];

      // This is hidden from #tabledrag array (above).
      // TableDrag: Weight column element.
      $form['table-row'][$row->id]['weight'] = [
        '#type' => 'weight',
        '#title' => $this
          ->t('Weight for ID @id', [
          '@id' => $row->id,
        ]),
        '#title_display' => 'invisible',
        '#default_value' => $row->weight,
        // Classify the weight element for #tabledrag.
        '#attributes' => [
          'class' => [
            'row-weight',
          ],
        ],
      ];
      $form['table-row'][$row->id]['parent']['id'] = [
        '#parents' => [
          'table-row',
          $row->id,
          'id',
        ],
        '#type' => 'hidden',
        '#value' => $row->id,
        '#attributes' => [
          'class' => [
            'row-id',
          ],
        ],
      ];
      $form['table-row'][$row->id]['parent']['pid'] = [
        '#parents' => [
          'table-row',
          $row->id,
          'pid',
        ],
        '#type' => 'number',
        '#size' => 3,
        '#min' => 0,
        '#title' => $this
          ->t('Parent ID'),
        '#default_value' => $row->pid,
        '#attributes' => [
          'class' => [
            'row-pid',
          ],
        ],
      ];
    }
    $form['actions'] = [
      '#type' => 'actions',
    ];
    $form['actions']['submit'] = [
      '#type' => 'submit',
      '#value' => $this
        ->t('Save All Changes'),
    ];
    $form['actions']['cancel'] = [
      '#type' => 'submit',
      '#value' => 'Cancel',
      '#attributes' => [
        'title' => $this
          ->t('Return to TableDrag Overview'),
      ],
      '#submit' => [
        '::cancel',
      ],
    ];
    return $form;
  }

  /**
   * Form submission handler for the 'Return to' action.
   *
   * @param array $form
   *   An associative array containing the structure of the form.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The current state of the form.
   */
  public function cancel(array &$form, FormStateInterface $form_state) {
    $form_state
      ->setRedirect('tabledrag_example.description');
  }

  /**
   * Submit handler for the form.
   *
   * Updates the 'weight' column for each element in our table, taking into
   * account that item's new order after the drag and drop actions have been
   * performed.
   *
   * @param array $form
   *   Render array representing from.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   Current form state.
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {

    // Because the form elements were keyed with the item ids from the database,
    // we can simply iterate through the submitted values.
    $submissions = $form_state
      ->getValue('table-row');
    foreach ($submissions as $id => $item) {
      $this->database
        ->update('tabledrag_example')
        ->fields([
        'weight' => $item['weight'],
        'pid' => $item['pid'],
        'description' => $item['description'],
      ])
        ->condition('id', $id, '=')
        ->execute();
    }
  }

  /**
   * Retrieves the tree structure from database, sorts by parent/child/weight.
   *
   * The sorting should result in children items immediately following their
   * parent items, with items at the same level of the hierarchy sorted by
   * weight.
   *
   * The approach used here may be considered too database-intensive.
   * Optimization of the approach is left as an exercise for the reader. :)
   *
   * @return array
   *   An associative array storing our ordered tree structure.
   */
  public function getData() {

    // Get all 'root node' items (items with no parents), sorted by weight.
    $root_items = $this->database
      ->select('tabledrag_example', 't')
      ->fields('t')
      ->condition('pid', '0', '=')
      ->orderBy('weight')
      ->execute()
      ->fetchAll();

    // Initialize a variable to store our ordered tree structure.
    $tree = [];

    // Depth will be incremented in our getTree()
    // function for the first parent item, so we start it at -1.
    $depth = -1;

    // Loop through the root item, and add their trees to the array.
    foreach ($root_items as $root_item) {
      $this
        ->getTree($root_item, $tree, $depth);
    }
    return $tree;
  }

  /**
   * Recursively adds $item to $item_tree, ordered by parent/child/weight.
   *
   * @param mixed $item
   *   The item.
   * @param array $tree
   *   The item tree.
   * @param int $depth
   *   The depth of the item.
   */
  public function getTree($item, array &$tree = [], &$depth = 0) {

    // Increase our $depth value by one.
    $depth++;

    // Set the current tree 'depth' for this item, used to calculate
    // indentation.
    $item->depth = $depth;

    // Add the item to the tree.
    $tree[$item->id] = $item;

    // Retrieve each of the children belonging to this nested demo.
    $children = $this->database
      ->select('tabledrag_example', 't')
      ->fields('t')
      ->condition('pid', $item->id, '=')
      ->orderBy('weight')
      ->execute()
      ->fetchAll();
    foreach ($children as $child) {

      // Make sure this child does not already exist in the tree, to
      // avoid loops.
      if (!in_array($child->id, array_keys($tree))) {

        // Add this child's tree to the $itemtree array.
        $this
          ->getTree($child, $tree, $depth);
      }
    }

    // Finished processing this tree branch.  Decrease our $depth value by one
    // to represent moving to the next branch.
    $depth--;
  }

}

Members

Namesort descending Modifiers Type Description Overrides
DependencySerializationTrait::$_entityStorages protected property An array of entity type IDs keyed by the property name of their storages.
DependencySerializationTrait::$_serviceIds protected property An array of service IDs keyed by property name used for serialization.
DependencySerializationTrait::__sleep public function 1
DependencySerializationTrait::__wakeup public function 2
FormBase::$configFactory protected property The config factory. 1
FormBase::$requestStack protected property The request stack. 1
FormBase::$routeMatch protected property The route match.
FormBase::config protected function Retrieves a configuration object.
FormBase::configFactory protected function Gets the config factory for this form. 1
FormBase::container private function Returns the service container.
FormBase::currentUser protected function Gets the current user.
FormBase::getRequest protected function Gets the request object.
FormBase::getRouteMatch protected function Gets the route match.
FormBase::logger protected function Gets the logger for a specific channel.
FormBase::redirect protected function Returns a redirect response object for the specified route. Overrides UrlGeneratorTrait::redirect
FormBase::resetConfigFactory public function Resets the configuration factory.
FormBase::setConfigFactory public function Sets the config factory for this form.
FormBase::setRequestStack public function Sets the request stack object to use.
FormBase::validateForm public function Form validation handler. Overrides FormInterface::validateForm 62
LinkGeneratorTrait::$linkGenerator protected property The link generator. 1
LinkGeneratorTrait::getLinkGenerator Deprecated protected function Returns the link generator.
LinkGeneratorTrait::l Deprecated protected function Renders a link to a route given a route name and its parameters.
LinkGeneratorTrait::setLinkGenerator Deprecated public function Sets the link generator service.
LoggerChannelTrait::$loggerFactory protected property The logger channel factory service.
LoggerChannelTrait::getLogger protected function Gets the logger for a specific channel.
LoggerChannelTrait::setLoggerFactory public function Injects the logger channel factory.
MessengerTrait::$messenger protected property The messenger. 29
MessengerTrait::messenger public function Gets the messenger. 29
MessengerTrait::setMessenger public function Sets the messenger.
RedirectDestinationTrait::$redirectDestination protected property The redirect destination service. 1
RedirectDestinationTrait::getDestinationArray protected function Prepares a 'destination' URL query parameter for use with \Drupal\Core\Url.
RedirectDestinationTrait::getRedirectDestination protected function Returns the redirect destination service.
RedirectDestinationTrait::setRedirectDestination public function Sets the redirect destination service.
StringTranslationTrait::$stringTranslation protected property The string translation service. 1
StringTranslationTrait::formatPlural protected function Formats a string containing a count of items.
StringTranslationTrait::getNumberOfPlurals protected function Returns the number of plurals supported by a given language.
StringTranslationTrait::getStringTranslation protected function Gets the string translation service.
StringTranslationTrait::setStringTranslation public function Sets the string translation service to use. 2
StringTranslationTrait::t protected function Translates a string to the current language or to a given language.
TableDragExampleRootLeafForm::$database protected property The database connection.
TableDragExampleRootLeafForm::$render protected property The renderer.
TableDragExampleRootLeafForm::buildForm public function Build the parent-child example form. Overrides FormInterface::buildForm
TableDragExampleRootLeafForm::cancel public function Form submission handler for the 'Return to' action.
TableDragExampleRootLeafForm::create public static function Instantiates a new instance of this class. Overrides FormBase::create
TableDragExampleRootLeafForm::getData public function Retrieves the tree structure from database, sorts by parent/child/weight.
TableDragExampleRootLeafForm::getFormId public function Returns a unique string identifying the form. Overrides FormInterface::getFormId
TableDragExampleRootLeafForm::getTree public function Recursively adds $item to $item_tree, ordered by parent/child/weight.
TableDragExampleRootLeafForm::submitForm public function Submit handler for the form. Overrides FormInterface::submitForm
TableDragExampleRootLeafForm::__construct public function Construct a form.
UrlGeneratorTrait::$urlGenerator protected property The url generator.
UrlGeneratorTrait::getUrlGenerator Deprecated protected function Returns the URL generator service.
UrlGeneratorTrait::setUrlGenerator Deprecated public function Sets the URL generator service.
UrlGeneratorTrait::url Deprecated protected function Generates a URL or path for a specific route based on the given parameters.