Builds and returns the renderable array for this block plugin.

If a block should not be rendered because it has no content, then this method must also ensure to return no content: it must then only return an empty array, or an empty array with #cache set (with cacheability metadata indicating the circumstances for it being empty).

Return value

array A renderable array representing the content of the block.

Overrides BlockPluginInterface::build

File

core/modules/system/tests/modules/render_attached_test/src/Plugin/Block/AttachedRenderingBlock.php, line 26

Class

AttachedRenderingBlock

A block we can use to test caching of #attached headers.

Namespace

Drupal\render_attached_test\Plugin\Block

Code

public function build() {
  // Grab test attachment fixtures from
  // Drupal\render_attached_test\Controller\RenderAttachedTestController.
  $controller = new RenderAttachedTestController();
  $attached = BubbleableMetadata::mergeAttachments($controller->feed(), $controller->head());
  $attached = BubbleableMetadata::mergeAttachments($attached, $controller->header());
  $attached = BubbleableMetadata::mergeAttachments($attached, $controller->teapotHeaderStatus());
  // Return some arbitrary markup so the block doesn't disappear.
  $attached['#markup'] = 'Markup from attached_rendering_block.';
  return $attached;
}

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