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' => $this->t('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) : $this->t('no arguments');
            $this->messenger()
                ->addStatus($this->t('The test button at row @row_index for @view_id (@display) View with args: @args was submitted.', [
                '@display' => $this->view->current_display,
                '@view_id' => $this->view
                    ->id(),
                '@args' => $view_args,
                '@row_index' => $row_index,
            ]));
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        // Do nothing.
    }

}