diff core/modules/system/src/Plugin/Block/SystemMessagesBlock.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/system/src/Plugin/Block/SystemMessagesBlock.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,47 @@
+<?php
+
+namespace Drupal\system\Plugin\Block;
+
+use Drupal\Core\Block\BlockBase;
+use Drupal\Core\Block\MessagesBlockPluginInterface;
+use Drupal\Core\Cache\Cache;
+
+/**
+ * Provides a block to display the messages.
+ *
+ * @see drupal_set_message()
+ *
+ * @Block(
+ *   id = "system_messages_block",
+ *   admin_label = @Translation("Messages")
+ * )
+ */
+class SystemMessagesBlock extends BlockBase implements MessagesBlockPluginInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return [
+      'label_display' => FALSE,
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function build() {
+    return ['#type' => 'status_messages'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCacheMaxAge() {
+    // The messages are session-specific and hence aren't cacheable, but the
+    // block itself *is* cacheable because it uses a #lazy_builder callback and
+    // hence the block has a globally cacheable render array.
+    return Cache::PERMANENT;
+  }
+
+}