--- /dev/null
+<?php
+
+namespace Drupal\settings_tray\Access;
+
+use Drupal\block\BlockInterface;
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Routing\Access\AccessInterface;
+
+/**
+ * Determines whether the requested block has a 'settings_tray' form.
+ *
+ * @internal
+ */
+class BlockHasOverridesAccessCheck 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 $block) {
+ return AccessResult::allowedIf(!_settings_tray_has_block_overrides($block));
+ }
+
+}