Strange but true: In drupal 8 you can place a rendered block entity into the views header - but only, if this block shows up anywhere, if it is placed in a region. I've read, that display settings of the block are respected in this case.
Now, I needed the block only in the views header of a special view - I didn't want to define a hidden region or anything the like.
My solution was to create a custom views area field and render the block this way. Only two files where needed in my drupal module:
roomprices.views.inc
src/Plugin/views/area/RoompricesSeasons.php
And for sure, I had to create a block in my custom module. The usecase is a table of season times in the header of a view showing all hotel rooms with their prices in different seasons. I didn't want to repeat the seasons times on every node, at least not in desktop views of the page.
In roomprices.views.inc I've put:
<?php
/**
* Implements hook_views_data().
*/
function roomprices_views_data() {
$data['views']['roomprices_seasons'] = array(
'title' => t('Seasons'),
'help' => t('Table of season times'),
'area' => array(
'id' => 'roomprices_seasons',
),
);
return $data;
}
in RoompricesSeasons.php:
<?php
namespace Drupal\roomprices\Plugin\views\area;
use Drupal\views\Plugin\views\area\AreaPluginBase;
use Drupal\roomprices\Plugin\Block\SeasonsBlock;/**
* Defines a views area plugin.
*
* @ingroup views_area_handlers
*
* @ViewsArea("roomprices_seasons")
*/
class RoompricesSeasons extends AreaPluginBase {/**
* {@inheritdoc}
*/
public function render($empty = FALSE) {
$seasons = SeasonsBlock::build();
return $seasons;
}
}