3 files changed, 8 insertions, 4 deletions
diff --git a/include/cru/ui/Base.hpp b/include/cru/ui/Base.hpp
index c59d1b60..9036a47b 100644
--- a/include/cru/ui/Base.hpp
+++ b/include/cru/ui/Base.hpp
@@ -185,6 +185,10 @@ class Control;
 class ClickDetector;
 class UiHost;
 
+namespace render {
+class RenderObject;
+}
+
 //-------------------- region: basic types --------------------
 namespace internal {
 constexpr int align_start = 0;
diff --git a/include/cru/ui/UiEvent.hpp b/include/cru/ui/UiEvent.hpp
index 79d0f7e3..39f26aee 100644
--- a/include/cru/ui/UiEvent.hpp
+++ b/include/cru/ui/UiEvent.hpp
@@ -13,10 +13,6 @@ namespace cru::platform::graph {
 struct IPainter;
 }
 
-namespace cru::ui {
-class Control;
-}
-
 namespace cru::ui::event {
 class UiEventArgs : public Object {
  public:
@@ -88,6 +84,7 @@ class MouseEventArgs : public UiEventArgs {
 
   // This point is relative to window client lefttop.
   Point GetPoint() const { return point_.value_or(Point{}); }
+  Point GetPointToContent(render::RenderObject* render_target) const;
 
  private:
   std::optional<Point> point_;
diff --git a/include/cru/ui/render/ScrollRenderObject.hpp b/include/cru/ui/render/ScrollRenderObject.hpp
index 0c1fb16b..20b7278c 100644
--- a/include/cru/ui/render/ScrollRenderObject.hpp
+++ b/include/cru/ui/render/ScrollRenderObject.hpp
@@ -28,6 +28,9 @@ class ScrollRenderObject : public RenderObject {
   void SetScrollOffset(const Point& offset);
   Point GetRawScrollOffset() const { return scroll_offset_; }
 
+  // Rect lefttop relative to content rect.
+  void ScrollToContain(const Rect& rect);
+
  protected:
   void OnDrawCore(platform::graph::IPainter* painter) override;