--- /dev/null
+<?php
+
+namespace Drupal\settings_tray\Access;
+
+use Drupal\block\BlockInterface;
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Block\BlockPluginInterface;
+use Drupal\Core\Plugin\PluginWithFormsInterface;
+use Drupal\Core\Routing\Access\AccessInterface;
+
+/**
+ * Determines whether the requested block has a 'settings_tray' form.
+ *
+ * @internal
+ */
+class BlockPluginHasSettingsTrayFormAccessCheck implements AccessInterface {
+
+ /**
+ * Checks access for accessing a block's 'settings_tray' form.
+ *
+ * @param \Drupal\block\BlockInterface $block
+ * The block whose 'settings_tray' form is being accessed.
+ *
+ * @return \Drupal\Core\Access\AccessResultInterface
+ * The access result.
+ */
+ public function access(BlockInterface $block) {
+ /** @var \Drupal\Core\Block\BlockPluginInterface $block_plugin */
+ $block_plugin = $block->getPlugin();
+ return $this->accessBlockPlugin($block_plugin);
+ }
+
+ /**
+ * Checks access for accessing a block plugin's 'settings_tray' form.
+ *
+ * @param \Drupal\Core\Block\BlockPluginInterface $block_plugin
+ * The block plugin whose 'settings_tray' form is being accessed.
+ *
+ * @return \Drupal\Core\Access\AccessResultInterface
+ * The access result.
+ *
+ * @see settings_tray_preprocess_block()
+ */
+ public function accessBlockPlugin(BlockPluginInterface $block_plugin) {
+ return AccessResult::allowedIf($block_plugin instanceof PluginWithFormsInterface && $block_plugin->hasFormClass('settings_tray'));
+ }
+
+}