/**
* {@inheritdoc}
*/
public function build()
{
// Track whether blocks showing the main content and messages are displayed.
$main_content_block_displayed = FALSE;
$messages_block_displayed = FALSE;
$build = ['#cache' => ['tags' => $this->blockListCacheTags]];
// Load all region content assigned via blocks.
$cacheable_metadata_list = [];
foreach ($this->blockRepository->getVisibleBlocksPerRegion($cacheable_metadata_list) as $region => $blocks) {
/** @var $blocks \Drupal\block\BlockInterface[] */
foreach ($blocks as $key => $block) {
$block_plugin = $block->getPlugin();
if ($block_plugin instanceof MainContentBlockPluginInterface) {
$block_plugin->setMainContent($this->mainContent);
$main_content_block_displayed = TRUE;
} elseif ($block_plugin instanceof MessagesBlockPluginInterface) {
$messages_block_displayed = TRUE;
}
$build[$region][$key] = $this->blockViewBuilder->view($block);
// The main content block cannot be cached: it is a placeholder for the
// render array returned by the controller. It should be rendered as-is,
// with other placed blocks "decorating" it.
if ($block_plugin instanceof MainContentBlockPluginInterface) {
unset($build[$region][$key]['#cache']['keys']);
}
}
if (!empty($build[$region])) {
// \Drupal\block\BlockRepositoryInterface::getVisibleBlocksPerRegion()
// returns the blocks in sorted order.
$build[$region]['#sorted'] = TRUE;
}
}
// If no block that shows the main content is displayed, still show the main
// content. Otherwise the end user will see all displayed blocks, but not
// the main content they came for.
if (!$main_content_block_displayed) {
$build['content']['system_main'] = $this->mainContent;
}
// If no block displays status messages, still render them.
if (!$messages_block_displayed) {
$build['content']['messages'] = ['#weight' => -1000, '#type' => 'status_messages'];
}
// The access results' cacheability is currently added to the top level of the
// render array. This is done to prevent issues with empty regions being
// displayed.
// This would need to be changed to allow caching of block regions, as each
// region must then have the relevant cacheable metadata.
$merged_cacheable_metadata = CacheableMetadata::createFromRenderArray($build);
foreach ($cacheable_metadata_list as $cacheable_metadata) {
$merged_cacheable_metadata = $merged_cacheable_metadata->merge($cacheable_metadata);
}
$merged_cacheable_metadata->applyTo($build);
return $build;
}
/**
* {@inheritdoc}
*/
public function build()
{
// Track whether blocks showing the main content and messages are displayed.
$main_content_block_displayed = FALSE;
$messages_block_displayed = FALSE;
$build = ['#cache' => ['tags' => $this->blockListCacheTags]];
$contexts = $this->getActiveBlockContexts();
// Load all region content assigned via blocks.
foreach ($this->blockRepository->getVisibleBlocksPerRegion($contexts) as $region => $blocks) {
/** @var $blocks \Drupal\block\BlockInterface[] */
foreach ($blocks as $key => $block) {
$block_plugin = $block->getPlugin();
if ($block_plugin instanceof MainContentBlockPluginInterface) {
$block_plugin->setMainContent($this->mainContent);
$main_content_block_displayed = TRUE;
} elseif ($block_plugin instanceof MessagesBlockPluginInterface) {
$messages_block_displayed = TRUE;
}
$build[$region][$key] = $this->blockViewBuilder->view($block);
// The main content block cannot be cached: it is a placeholder for the
// render array returned by the controller. It should be rendered as-is,
// with other placed blocks "decorating" it.
if ($block_plugin instanceof MainContentBlockPluginInterface) {
unset($build[$region][$key]['#cache']['keys']);
}
}
if (!empty($build[$region])) {
// \Drupal\block\BlockRepositoryInterface::getVisibleBlocksPerRegion()
// returns the blocks in sorted order.
$build[$region]['#sorted'] = TRUE;
}
}
// If no block that shows the main content is displayed, still show the main
// content. Otherwise the end user will see all displayed blocks, but not
// the main content they came for.
if (!$main_content_block_displayed) {
$build['content']['system_main'] = $this->mainContent;
}
// If no block displays status messages, still render them.
if (!$messages_block_displayed) {
$build['content']['messages'] = ['#weight' => -1000, '#type' => 'status_messages'];
}
return $build;
}