1 files changed, 24 insertions, 0 deletions
diff --git a/CruUI/ui/events/ui_event.h b/CruUI/ui/events/ui_event.h
index efb0479b..ddf5f99f 100644
--- a/CruUI/ui/events/ui_event.h
+++ b/CruUI/ui/events/ui_event.h
@@ -168,6 +168,29 @@ namespace cru
                 Size new_size_;
             };
 
+            class FocusChangeEventArgs : public UiEventArgs
+            {
+            public:
+                FocusChangeEventArgs(Object* sender, Object* original_sender, const bool is_window =false)
+                    : UiEventArgs(sender, original_sender), is_window_(is_window) 
+                {
+                    
+                }
+                FocusChangeEventArgs(const FocusChangeEventArgs& other) = default;
+                FocusChangeEventArgs(FocusChangeEventArgs&& other) = default;
+                FocusChangeEventArgs& operator=(const FocusChangeEventArgs& other) = default;
+                FocusChangeEventArgs& operator=(FocusChangeEventArgs&& other) = default;
+                ~FocusChangeEventArgs() override = default;
+
+                // Return whether the focus change is caused by the window-wide focus change.
+                bool IsWindow() const
+                {
+                    return is_window_;
+                }
+
+            private:
+                bool is_window_;
+            };
 
             using UiEvent = Event<UiEventArgs>;
             using MouseEvent = Event<MouseEventArgs>;
@@ -175,6 +198,7 @@ namespace cru
             using DrawEvent = Event<DrawEventArgs>;
             using PositionChangedEvent = Event<PositionChangedEventArgs>;
             using SizeChangedEvent = Event<SizeChangedEventArgs>;
+            using FocusChangeEvent = Event<FocusChangeEventArgs>;
         }
     }
 }