l10n_server-2.x-dev/l10n_community/src/Form/JumpForm.php

<?php
declare(strict_types=1);

namespace Drupal\l10n_community\Form;

use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;

/**
 * Provides a Localization community UI form.
 */
class JumpForm extends FormBase {

  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'l10n_community_jump';
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $form['project'] = [
      '#type' => 'entity_autocomplete',
      '#target_type' => 'l10n_server_project',
      "#prefix" => '<strong>' . $this->t('Pick a project to jump to') . '</strong>',
    ];
    $form['actions'] = [
      '#type' => 'actions',
    ];
    $form['actions']['submit'] = [
      '#type' => 'submit',
      '#value' => $this->t('Go'),
    ];
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    if ($pid = $form_state->getValue('project')) {
      $project = \Drupal::entityTypeManager()
        ->getStorage('l10n_server_project')
        ->load($pid);
      if ($project) {
        $url = Url::fromUri('internal:/translate/projects/' . $pid);
        $form_state->setRedirectUrl($url);
      }
    }
  }

}