1 files changed, 8 insertions, 2 deletions
diff --git a/include/cru/ui/events/UiEvent.hpp b/include/cru/ui/events/UiEvent.hpp
index 22ad0150..33bc0a60 100644
--- a/include/cru/ui/events/UiEvent.hpp
+++ b/include/cru/ui/events/UiEvent.hpp
@@ -122,18 +122,24 @@ class MouseButtonEventArgs : public MouseEventArgs {
 class MouseWheelEventArgs : public MouseEventArgs {
  public:
   MouseWheelEventArgs(Object* sender, Object* original_sender,
-                      const Point& point, const float delta)
-      : MouseEventArgs(sender, original_sender, point), delta_(delta) {}
+                      const Point& point, const float delta,
+                      platform::gui::KeyModifier key_modifier)
+      : MouseEventArgs(sender, original_sender, point),
+        delta_(delta),
+        key_modifier_(key_modifier) {}
   MouseWheelEventArgs(const MouseWheelEventArgs& other) = default;
   MouseWheelEventArgs(MouseWheelEventArgs&& other) = default;
   MouseWheelEventArgs& operator=(const MouseWheelEventArgs& other) = default;
   MouseWheelEventArgs& operator=(MouseWheelEventArgs&& other) = default;
   ~MouseWheelEventArgs() override = default;
 
+  // Positive means down; Negative means up.
   float GetDelta() const { return delta_; }
+  platform::gui::KeyModifier GetKeyModifier() const { return key_modifier_; }
 
  private:
   float delta_;
+  platform::gui::KeyModifier key_modifier_;
 };
 
 class PaintEventArgs : public UiEventArgs {