From 28cb6b8045409c6fd0915eedb89562c576cbd427 Mon Sep 17 00:00:00 2001
From: "darkhan.nausharipov" <darkhan.nausharipov@kzn.akvelon.com>
Date: Wed, 9 Nov 2022 16:09:02 +0600
Subject: [PATCH] expand & collapse group (#23593)

---
 .../lib/pages/tour/controllers/content_tree.dart    | 13 +++++++------
 .../frontend/lib/pages/tour/widgets/group.dart      |  9 +++++----
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/learning/tour-of-beam/frontend/lib/pages/tour/controllers/content_tree.dart b/learning/tour-of-beam/frontend/lib/pages/tour/controllers/content_tree.dart
index 9977cd3c5178..bfa63c94df4f 100644
--- a/learning/tour-of-beam/frontend/lib/pages/tour/controllers/content_tree.dart
+++ b/learning/tour-of-beam/frontend/lib/pages/tour/controllers/content_tree.dart
@@ -71,12 +71,13 @@ class ContentTreeController extends ChangeNotifier {
     notifyListeners();
   }
 
-  void updateExpandedIds(GroupModel group, {required bool isExpanding}) {
-    if (isExpanding) {
-      _expandedIds.add(group.id);
-    } else {
-      _expandedIds.remove(group.id);
-    }
+  void expandGroup(GroupModel group) {
+    _expandedIds.add(group.id);
+    notifyListeners();
+  }
+
+  void collapseGroup(GroupModel group) {
+    _expandedIds.remove(group.id);
     notifyListeners();
   }
 
diff --git a/learning/tour-of-beam/frontend/lib/pages/tour/widgets/group.dart b/learning/tour-of-beam/frontend/lib/pages/tour/widgets/group.dart
index d773ad9b40bb..67c3f9528599 100644
--- a/learning/tour-of-beam/frontend/lib/pages/tour/widgets/group.dart
+++ b/learning/tour-of-beam/frontend/lib/pages/tour/widgets/group.dart
@@ -70,10 +70,11 @@ class _StatelessExpansionTile extends StatelessWidget {
         initiallyExpanded: isExpanded,
         tilePadding: EdgeInsets.zero,
         onExpansionChanged: (isExpanding) {
-          contentTreeController.updateExpandedIds(
-            group,
-            isExpanding: isExpanding,
-          );
+          if (isExpanding) {
+            contentTreeController.expandGroup(group);
+          } else {
+            contentTreeController.collapseGroup(group);
+          }
         },
         title: GroupTitleWidget(
           group: group,