simple_multistep-8.x-1.x-dev/src/FormButton.php

<?php

namespace Drupal\simple_multistep;

use Drupal\Core\Form\FormStateInterface;

/**
 * The FormButton class.
 *
 * @package Drupal\simple_multistep
 */
class FormButton extends FormStep {

  /**
   * The constructor for FormButton.
   *
   * @param array $form
   *   Form settings.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   Form state object.
   * @param int $current_step
   *   Current step.
   */
  public function __construct(array $form, FormStateInterface $form_state, $current_step) {
    parent::__construct($form, $form_state);

    $this->currentStep = $current_step;
    $this->fetchStepSettings();
  }

  /**
   * Show back button.
   *
   * @param array $form
   *   Reference to form array.
   */
  private function showBackButton(array &$form) {
    $step_format_settings = $this->stepSettings->format_settings;

    if ($this->currentStep !== 0 && !empty($step_format_settings['back_button_show'])) {
      $form['actions']['back_button'] = [
        '#type' => 'submit',
        '#value' => $step_format_settings['back_button_text'],
        '#validate' => ['simple_multistep_register_back_validation'],
        '#submit' => ['simple_multistep_register_back'],
        '#limit_validation_errors' => [],
        '#weight' => 0,
      ];
    }
  }

  /**
   * Show next button.
   *
   * @param array $form
   *   Reference to form array.
   */
  private function showNextButton(array &$form) {
    $step_format_settings = $this->stepSettings->format_settings;

    if (count($this->steps) - 1 !== $this->currentStep) {
      $form['actions']['next'] = [
        '#limit_validation_errors' => [],
        '#type' => 'submit',
        '#value' => $step_format_settings['next_button_text'],
        '#submit' => ['simple_multistep_register_next_step'],
        '#weight' => 0.1,
      ];
      $form['actions']['submit']['#access'] = FALSE;
    }
  }

  /**
   * Render form button.
   *
   * @param array $form
   *   Form array.
   */
  public function render(array &$form) {
    $this->showBackButton($form);
    $this->showNextButton($form);
  }

}