From 1497b881c6d13c5e037dcd57988029df0b0e50eb Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Wed, 12 May 2021 08:57:45 +0800
Subject: ...

---
 include/cru/platform/gui/Base.hpp   |  7 +++++++
 include/cru/platform/gui/Window.hpp |  1 +
 include/cru/ui/events/UiEvent.hpp   | 10 ++++++++--
 include/cru/ui/host/WindowHost.hpp  |  2 ++
 include/cru/win/gui/Window.hpp      | 11 +++++++----
 5 files changed, 25 insertions(+), 6 deletions(-)

(limited to 'include')

diff --git a/include/cru/platform/gui/Base.hpp b/include/cru/platform/gui/Base.hpp
index 7a9d1889..fd9d265c 100644
--- a/include/cru/platform/gui/Base.hpp
+++ b/include/cru/platform/gui/Base.hpp
@@ -31,6 +31,13 @@ struct NativeMouseButtonEventArgs {
   KeyModifier modifier;
 };
 
+struct NativeMouseWheelEventArgs {
+  // Positive means down. Negative means up. 
+  float delta;
+  Point point;
+  KeyModifier modifier;
+};
+
 struct NativeKeyEventArgs {
   KeyCode key;
   KeyModifier modifier;
diff --git a/include/cru/platform/gui/Window.hpp b/include/cru/platform/gui/Window.hpp
index 26d1a476..b2129322 100644
--- a/include/cru/platform/gui/Window.hpp
+++ b/include/cru/platform/gui/Window.hpp
@@ -49,6 +49,7 @@ struct INativeWindow : virtual INativeResource {
   virtual IEvent<Point>* MouseMoveEvent() = 0;
   virtual IEvent<NativeMouseButtonEventArgs>* MouseDownEvent() = 0;
   virtual IEvent<NativeMouseButtonEventArgs>* MouseUpEvent() = 0;
+  virtual IEvent<NativeMouseWheelEventArgs>* MouseWheelEvent() = 0;
   virtual IEvent<NativeKeyEventArgs>* KeyDownEvent() = 0;
   virtual IEvent<NativeKeyEventArgs>* KeyUpEvent() = 0;
 
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 {
diff --git a/include/cru/ui/host/WindowHost.hpp b/include/cru/ui/host/WindowHost.hpp
index cd9093bc..258b0c4c 100644
--- a/include/cru/ui/host/WindowHost.hpp
+++ b/include/cru/ui/host/WindowHost.hpp
@@ -139,6 +139,8 @@ class WindowHost : public Object {
                          const platform::gui::NativeMouseButtonEventArgs& args);
   void OnNativeMouseUp(platform::gui::INativeWindow* window,
                        const platform::gui::NativeMouseButtonEventArgs& args);
+  void OnNativeMouseWheel(platform::gui::INativeWindow* window,
+                          const platform::gui::NativeMouseWheelEventArgs& args);
 
   void OnNativeKeyDown(platform::gui::INativeWindow* window,
                        const platform::gui::NativeKeyEventArgs& args);
diff --git a/include/cru/win/gui/Window.hpp b/include/cru/win/gui/Window.hpp
index 3ba9ef68..97a74fa7 100644
--- a/include/cru/win/gui/Window.hpp
+++ b/include/cru/win/gui/Window.hpp
@@ -59,14 +59,16 @@ class WinNativeWindow : public WinNativeResource, public virtual INativeWindow {
     return &mouse_enter_leave_event_;
   }
   IEvent<Point>* MouseMoveEvent() override { return &mouse_move_event_; }
-  IEvent<platform::gui::NativeMouseButtonEventArgs>* MouseDownEvent()
-      override {
+  IEvent<platform::gui::NativeMouseButtonEventArgs>* MouseDownEvent() override {
     return &mouse_down_event_;
   }
-  IEvent<platform::gui::NativeMouseButtonEventArgs>* MouseUpEvent()
-      override {
+  IEvent<platform::gui::NativeMouseButtonEventArgs>* MouseUpEvent() override {
     return &mouse_up_event_;
   }
+  IEvent<NativeMouseWheelEventArgs>* MouseWheelEvent() override {
+    return &mouse_wheel_event_;
+  }
+
   IEvent<platform::gui::NativeKeyEventArgs>* KeyDownEvent() override {
     return &key_down_event_;
   }
@@ -170,6 +172,7 @@ class WinNativeWindow : public WinNativeResource, public virtual INativeWindow {
   Event<Point> mouse_move_event_;
   Event<platform::gui::NativeMouseButtonEventArgs> mouse_down_event_;
   Event<platform::gui::NativeMouseButtonEventArgs> mouse_up_event_;
+  Event<platform::gui::NativeMouseWheelEventArgs> mouse_wheel_event_;
   Event<platform::gui::NativeKeyEventArgs> key_down_event_;
   Event<platform::gui::NativeKeyEventArgs> key_up_event_;
 
-- 
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