...

1 files changed, 14 insertions, 0 deletions

diff --git a/include/cru/ui/render/ScrollBar.hpp b/include/cru/ui/render/ScrollBar.hpp
index 8f18c821..a271ae71 100644
--- a/include/cru/ui/render/ScrollBar.hpp
+++ b/include/cru/ui/render/ScrollBar.hpp
@@ -104,6 +104,9 @@ class ScrollBar : public Object {
   virtual float CalculateNewScrollPosition(const Rect& thumb_original_rect,
                                            const Point& mouse_offset) = 0;
 
+  virtual bool CanScrollUp() = 0;
+  virtual bool CanScrollDown() = 0;
+
  private:
   void SetCursor();
   void RestoreCursor();
@@ -113,6 +116,8 @@ class ScrollBar : public Object {
 
   void OnMouseLeave();
 
+  ScrollBarBrushStateKind GetState(ScrollBarAreaKind area);
+
  protected:
   gsl::not_null<ScrollRenderObject*> render_object_;
 
@@ -135,6 +140,9 @@ class ScrollBar : public Object {
   Rect move_thumb_thumb_original_rect_;
   std::optional<Point> move_thumb_start_;
 
+  std::optional<ScrollBarAreaKind> mouse_hover_;
+  std::optional<ScrollBarAreaKind> mouse_press_;
+
   EventRevokerListGuard event_guard_;
 
   Event<Scroll> scroll_attempt_event_;
@@ -172,6 +180,9 @@ class HorizontalScrollBar : public ScrollBar {
 
   float CalculateNewScrollPosition(const Rect& thumb_original_rect,
                                    const Point& mouse_offset) override;
+
+  bool CanScrollUp() override;
+  bool CanScrollDown() override;
 };
 
 class VerticalScrollBar : public ScrollBar {
@@ -201,6 +212,9 @@ class VerticalScrollBar : public ScrollBar {
 
   float CalculateNewScrollPosition(const Rect& thumb_original_rect,
                                    const Point& mouse_offset) override;
+
+  bool CanScrollUp() override;
+  bool CanScrollDown() override;
 };
 
 // A delegate to draw scrollbar and register related events.