public function HighContrastSwitchForm::buildForm in High contrast 8

Form constructor.

Parameters

array $form: An associative array containing the structure of the form.

\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.

Return value

array The form structure.

Overrides FormInterface::buildForm

File

src/Form/HighContrastSwitchForm.php, line 29

Class

HighContrastSwitchForm

Class HighContrastSwitchForm.

Namespace

Drupal\high_contrast\Form

Code

public function buildForm(array $form, FormStateInterface $form_state) {

  // Set cache context for the form.
  $form['#cache']['contexts'][] = 'high_contrast';

  // Default settings.
  $settings = [
    // Defines the widget type to use: 'links', 'select', 'radios'.
    'switcher_widget' => 'links',
    // Not used.
    'switcher_label' => 'Contrast:',
    // The label for the high contrast element.
    'high_label' => $this
      ->t('Enable'),
    // Not used.
    'separator' => '|',
    // The label for the normal page form element.
    'normal_label' => $this
      ->t('Disable'),
    // Whether or not the form should submit automatically.
    'use_ajax' => FALSE,
    // Shows a single link/checkbox instead or two links/radios.
    'toggle_element' => FALSE,
  ];

  // Merge in provided settings.
  foreach ($settings as $key => $value) {
    if (!empty($form_state
      ->getBuildInfo()['args'][0][$key])) {
      $settings[$key] = $form_state
        ->getBuildInfo()['args'][0][$key];
    }
  }

  // Provide possible values.
  $values = [
    0 => $settings['normal_label'],
    1 => $settings['high_label'],
  ];

  // Build the select / radios form element.
  if ($settings['switcher_widget'] == 'select' || $settings['switcher_widget'] == 'radios') {
    $form['switch'] = [
      '#type' => $settings['switcher_widget'],
      '#options' => $values,
      '#default_value' => $this
        ->highContrastEnabled() ? 1 : 0,
    ];

    // If a toggle option is preferred, show a single checkbox instead.
    if ($settings['switcher_widget'] == 'radios' && $settings['toggle_element']) {
      $form['switch']['#type'] = 'checkbox';
      $form['switch']['#title'] = $settings['high_label'];
      unset($form['switch']['#options']);
    }
    $form['submit'] = [
      '#type' => 'submit',
      '#value' => 'Go',
    ];

    // The form should automatically submit. Hide the submit button as well.
    if ($settings['use_ajax']) {
      $form['switch']['#attributes'] = [
        'onChange' => 'this.form.submit();',
      ];
      $form['submit']['#attributes']['class'][] = 'js-hide';
    }
  }
  else {

    // Fetch current url for the redirect back.
    $current_url = Url::fromRoute('<current>')
      ->toString();

    // No toggle, so build 2 links.
    if (!$settings['toggle_element']) {
      $form['enable_link'] = [
        '#type' => 'link',
        '#title' => $settings['high_label'],
        '#url' => Url::fromRoute('high_contrast.enable', [], [
          'query' => [
            'destination' => $current_url,
          ],
        ]),
      ];
      $form['disable_link'] = [
        '#type' => 'link',
        '#title' => $settings['normal_label'],
        '#url' => Url::fromRoute('high_contrast.disable', [], [
          'query' => [
            'destination' => $current_url,
          ],
        ]),
      ];
    }
    else {
      $route = $this
        ->highContrastEnabled() ? 'high_contrast.disable' : 'high_contrast.enable';
      $form['toggle_link'] = [
        '#type' => 'link',
        '#title' => $this
          ->highContrastEnabled() ? $settings['normal_label'] : $settings['high_label'],
        '#url' => Url::fromRoute($route, [], [
          'query' => [
            'destination' => $current_url,
          ],
        ]),
      ];
    }
  }
  return $form;
}