3 files changed, 13 insertions, 1 deletions
diff --git a/include/cru/ui/render/RenderObject.hpp b/include/cru/ui/render/RenderObject.hpp
index 4e5c9060..20e095fa 100644
--- a/include/cru/ui/render/RenderObject.hpp
+++ b/include/cru/ui/render/RenderObject.hpp
@@ -74,6 +74,8 @@ class RenderObject : public Object {
   void AddChild(RenderObject* render_object, Index position);
   void RemoveChild(Index position);
 
+  void TraverseDescendants(const std::function<void(RenderObject*)>& action);
+
   // Offset from parent's lefttop to lefttop of this render object. Margin is
   // accounted for.
   Point GetOffset() const { return offset_; }
diff --git a/src/ui/WindowHost.cpp b/src/ui/WindowHost.cpp
index 12eb746a..8c61d27d 100644
--- a/src/ui/WindowHost.cpp
+++ b/src/ui/WindowHost.cpp
@@ -184,8 +184,12 @@ void WindowHost::Relayout(const Size& available_size) {
       render::MeasureSize::NotSpecified());
   root_render_object_->Layout(Point{});
   for (auto& action : after_layout_stable_action_) action();
-  after_layout_stable_action_.clear();
   after_layout_event_.Raise(AfterLayoutEventArgs{});
+  root_render_object_->TraverseDescendants(
+      [](render::RenderObject* render_object) {
+        render_object->OnAfterLayout();
+      });
+  after_layout_stable_action_.clear();
   if constexpr (debug_flags::layout)
     log::TagDebug(log_tag, u"A relayout is finished.");
 }
diff --git a/src/ui/render/RenderObject.cpp b/src/ui/render/RenderObject.cpp
index fd0c7712..57929a21 100644
--- a/src/ui/render/RenderObject.cpp
+++ b/src/ui/render/RenderObject.cpp
@@ -41,6 +41,12 @@ void RenderObject::RemoveChild(const Index position) {
   OnRemoveChild(removed_child, position);
 }
 
+void RenderObject::TraverseDescendants(
+    const std::function<void(RenderObject*)>& action) {
+  action(this);
+  for (auto child : children_) child->TraverseDescendants(action);
+}
+
 Point RenderObject::GetTotalOffset() const {
   Point result{};
   const RenderObject* render_object = this;