class FieldFormButtonTest

class FieldFormButtonTest extends FieldPluginBase {
  use UncacheableFieldHandlerTrait;
  
  /**
   * {@inheritdoc}
   */
  public function getValue(ResultRow $row, $field = NULL) {
    return '<!--form-item-' . $this->options['id'] . '--' . $row->index . '-->';
  }
  
  /**
   * Form constructor for the views form.
   *
   * @param array $form
   *   An associative array containing the structure of the form.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The current state of the form.
   */
  public function viewsForm(&$form, FormStateInterface $form_state) {
    // Make sure we do not accidentally cache this form.
    $form['#cache']['max-age'] = 0;
    // The view is empty, abort.
    if (empty($this->view->result)) {
      unset($form['actions']);
      return;
    }
    $form[$this->options['id']]['#tree'] = TRUE;
    foreach ($this->view->result as $row_index => $row) {
      $form[$this->options['id']][$row_index] = [
        '#type' => 'submit',
        '#value' => 'Test Button',
        '#name' => 'test-button-' . $row_index,
        '#test_button' => TRUE,
        '#row_index' => $row_index,
        '#attributes' => [
          'class' => [
            'test-button',
          ],
        ],
      ];
    }
  }
  
  /**
   * Submit handler for the views form.
   *
   * @param array $form
   *   An associative array containing the structure of the form.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The current state of the form.
   */
  public function viewsFormSubmit(&$form, FormStateInterface $form_state) {
    $triggering_element = $form_state->getTriggeringElement();
    if (!empty($triggering_element['#test_button'])) {
      $row_index = $triggering_element['#row_index'];
      $view_args = !empty($this->view->args) ? implode(', ', $this->view->args) : 'no arguments';
      $display = $this->view->current_display;
      $view_id = $this->view
        ->id();
      $this->messenger()
        ->addStatus("The test button at row {$row_index} for {$view_id} ({$display}) View with args: {$view_args} was submitted.");
    }
  }
  
  /**
   * {@inheritdoc}
   */
  public function query() {
    // Do nothing.
  }

}