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<?php
namespace Drupal\Core\Display;
/**
* Provides an interface for PageDisplayVariant plugins.
*
* Page display variants are a specific type of DisplayVariant, intended for
* "pages", which always have some main content to be rendered. Hence page
* display variants may choose to render that main content in a certain way:
* decorated in a certain way, laid out in a certain way, et cetera.
*
* For example, the \Drupal\block\Plugin\DisplayVariant\FullPageVariant page
* display variant is used by the Block module to control regions and output
* blocks placed in those regions.
*
* @see \Drupal\Core\Display\Annotation\DisplayVariant
* @see \Drupal\Core\Display\VariantBase
* @see \Drupal\Core\Display\VariantManager
* @see plugin_api
*/
interface PageVariantInterface extends VariantInterface {
/**
* Sets the main content for the page being rendered.
*
* @param array $main_content
* The render array representing the main content.
*
* @return $this
*/
public function setMainContent(array $main_content);
/**
* Sets the title for the page being rendered.
*
* @param string|array $title
* The page title: either a string for plain titles or a render array for
* formatted titles.
*
* @return $this
*/
public function setTitle($title);
}