getPopulatedContexts example

if ($this->isUpdate) {
      if ($label = $section->getLayoutSettings()['label']) {
        $form['#title'] = $this->t('Configure @section', ['@section' => $label]);
      }
    }
    // Passing available contexts to the layout plugin here could result in an     // exception since the layout may not have a context mapping for a required     // context slot on creation.     $this->layout = $section->getLayout();

    $form_state->setTemporaryValue('gathered_contexts', $this->getPopulatedContexts($this->sectionStorage));
    $form['#tree'] = TRUE;
    $form['layout_settings'] = [];
    $subform_state = SubformState::createForSubform($form['layout_settings'], $form, $form_state);
    $form['layout_settings'] = $this->getPluginForm($this->layout)->buildConfigurationForm($form['layout_settings'], $subform_state);

    $form['actions']['submit'] = [
      '#type' => 'submit',
      '#value' => $this->isUpdate ? $this->t('Update') : $this->t('Add section'),
      '#button_type' => 'primary',
    ];
    if ($this->isAjax()) {
      

'#attributes' => [
        'class' => ['js-layout-builder-filter'],
        'title' => $this->t('Enter a part of the block name to filter by.'),
      ],
    ];

    $block_categories['#type'] = 'container';
    $block_categories['#attributes']['class'][] = 'block-categories';
    $block_categories['#attributes']['class'][] = 'js-layout-builder-categories';
    $block_categories['#attributes']['data-layout-builder-target-highlight-id'] = $this->blockAddHighlightId($delta, $region);

    $definitions = $this->blockManager->getFilteredDefinitions('layout_builder', $this->getPopulatedContexts($section_storage), [
      'section_storage' => $section_storage,
      'delta' => $delta,
      'region' => $region,
    ]);
    $grouped_definitions = $this->blockManager->getGroupedDefinitions($definitions);
    foreach ($grouped_definitions as $category => $blocks) {
      $block_categories[$category]['#type'] = 'details';
      $block_categories[$category]['#attributes']['class'][] = 'js-layout-builder-category';
      $block_categories[$category]['#open'] = TRUE;
      $block_categories[$category]['#title'] = $category;
      $block_categories[$category]['links'] = $this->getBlockLinks($section_storage, $delta, $region, $blocks);
    }

  public function build(SectionStorageInterface $section_storage, int $delta) {
    $items = [];
    $definitions = $this->layoutManager->getFilteredDefinitions('layout_builder', $this->getPopulatedContexts($section_storage), ['section_storage' => $section_storage]);
    foreach ($definitions as $plugin_id => $definition) {
      $layout = $this->layoutManager->createInstance($plugin_id);
      $item = [
        '#type' => 'link',
        '#title' => [
          'icon' => $definition->getIcon(60, 80, 1, 3),
          'label' => [
            '#type' => 'container',
            '#children' => $definition->getLabel(),
          ],
        ],
        

    }

    $this->sectionStorage = $section_storage;
    $this->delta = $delta;
    $this->uuid = $uuid;
    $this->region = $region;

    $form['#attributes']['data-layout-builder-target-highlight-id'] = $this->blockUpdateHighlightId($uuid);

    $sections = $section_storage->getSections();
    $contexts = $this->getPopulatedContexts($section_storage);
    $region_options = [];
    foreach ($sections as $section_delta => $section) {
      $layout = $section->getLayout($contexts);
      $layout_definition = $layout->getPluginDefinition();
      if (!($section_label = $section->getLayoutSettings()['label'])) {
        $section_label = $this->t('Section: @delta', ['@delta' => $section_delta + 1])->render();
      }
      foreach ($layout_definition->getRegions() as $region_name => $region_info) {
        // Group regions by section.         $region_options[$section_label]["$section_delta:$region_name"] = $this->t(
          '@section, Region: @region',
          [

  public function doBuildForm(array $form, FormStateInterface $form_state, SectionStorageInterface $section_storage = NULL, $delta = NULL, SectionComponent $component = NULL) {
    $this->sectionStorage = $section_storage;
    $this->delta = $delta;
    $this->uuid = $component->getUuid();
    $this->block = $component->getPlugin();

    $form_state->setTemporaryValue('gathered_contexts', $this->getPopulatedContexts($section_storage));

    $form['#tree'] = TRUE;
    $form['settings'] = [];
    $subform_state = SubformState::createForSubform($form['settings'], $form, $form_state);
    $form['settings'] = $this->getPluginForm($this->block)->buildConfigurationForm($form['settings'], $subform_state);

    $form['actions']['submit'] = [
      '#type' => 'submit',
      '#value' => $this->submitLabel(),
      '#button_type' => 'primary',
    ];
    

  protected function buildAdministrativeSection(SectionStorageInterface $section_storage, $delta) {
    $storage_type = $section_storage->getStorageType();
    $storage_id = $section_storage->getStorageId();
    $section = $section_storage->getSection($delta);

    $layout = $section->getLayout($this->getPopulatedContexts($section_storage));
    $layout_settings = $section->getLayoutSettings();
    $section_label = !empty($layout_settings['label']) ? $layout_settings['label'] : $this->t('Section @section', ['@section' => $delta + 1]);

    $build = $section->toRenderArray($this->getPopulatedContexts($section_storage), TRUE);
    $layout_definition = $layout->getPluginDefinition();

    $region_labels = $layout_definition->getRegionLabels();
    foreach ($layout_definition->getRegions() as $region => $info) {
      if (!empty($build[$region])) {
        foreach (Element::children($build[$region]) as $uuid) {
          $build[$region][$uuid]['#attributes']['class'][] = 'js-layout-builder-block';