1 files changed, 210 insertions, 0 deletions
diff --git a/include/cru/ui/ui_event.hpp b/include/cru/ui/ui_event.hpp
new file mode 100644
index 00000000..7a688d6d
--- /dev/null
+++ b/include/cru/ui/ui_event.hpp
@@ -0,0 +1,210 @@
+#pragma once
+#include "base.hpp"
+
+#include <memory>
+#include <optional>
+#include <type_traits>
+
+namespace cru::platform::graph {
+struct IPainter;
+}
+
+namespace cru::ui {
+class Control;
+}
+
+namespace cru::ui::event {
+class UiEventArgs : public Object {
+ public:
+  UiEventArgs(Object* sender, Object* original_sender)
+      : sender_(sender), original_sender_(original_sender), handled_(false) {}
+
+  UiEventArgs(const UiEventArgs& other) = default;
+  UiEventArgs(UiEventArgs&& other) = default;
+  UiEventArgs& operator=(const UiEventArgs& other) = default;
+  UiEventArgs& operator=(UiEventArgs&& other) = default;
+  ~UiEventArgs() override = default;
+
+  Object* GetOriginalSender() const { return original_sender_; }
+
+  bool IsHandled() const { return handled_; }
+  void SetHandled(const bool handled = true) { handled_ = handled; }
+
+ private:
+  Object* sender_;
+  Object* original_sender_;
+  bool handled_;
+};
+
+// TEventArgs must not be a reference type. This class help add reference.
+// EventArgs must be reference because the IsHandled property must be settable.
+template <typename TEventArgs>
+class RoutedEvent {
+ public:
+  static_assert(std::is_base_of_v<UiEventArgs, TEventArgs>,
+                "TEventArgs must be subclass of UiEventArgs.");
+  static_assert(!std::is_reference_v<TEventArgs>,
+                "TEventArgs must not be reference.");
+
+  using EventArgs = TEventArgs;
+
+  RoutedEvent() = default;
+  RoutedEvent(const RoutedEvent& other) = delete;
+  RoutedEvent(RoutedEvent&& other) = delete;
+  RoutedEvent& operator=(const RoutedEvent& other) = delete;
+  RoutedEvent& operator=(RoutedEvent&& other) = delete;
+  ~RoutedEvent() = default;
+
+  IEvent<TEventArgs&>* Direct() { return &direct_; }
+
+  IEvent<TEventArgs&>* Bubble() { return &bubble_; }
+
+  IEvent<TEventArgs&>* Tunnel() { return &tunnel_; }
+
+ private:
+  Event<TEventArgs&> direct_;
+  Event<TEventArgs&> bubble_;
+  Event<TEventArgs&> tunnel_;
+};
+
+class MouseEventArgs : public UiEventArgs {
+ public:
+  MouseEventArgs(Object* sender, Object* original_sender,
+                 const std::optional<Point>& point = std::nullopt)
+      : UiEventArgs(sender, original_sender), point_(point) {}
+  MouseEventArgs(const MouseEventArgs& other) = default;
+  MouseEventArgs(MouseEventArgs&& other) = default;
+  MouseEventArgs& operator=(const MouseEventArgs& other) = default;
+  MouseEventArgs& operator=(MouseEventArgs&& other) = default;
+  ~MouseEventArgs() override = default;
+
+  Point GetPoint() const { return point_.value_or(Point{}); }
+
+ private:
+  std::optional<Point> point_;
+};
+
+class MouseButtonEventArgs : public MouseEventArgs {
+ public:
+  MouseButtonEventArgs(Object* sender, Object* original_sender,
+                       const Point& point, const MouseButton button)
+      : MouseEventArgs(sender, original_sender, point), button_(button) {}
+  MouseButtonEventArgs(Object* sender, Object* original_sender,
+                       const MouseButton button)
+      : MouseEventArgs(sender, original_sender), button_(button) {}
+  MouseButtonEventArgs(const MouseButtonEventArgs& other) = default;
+  MouseButtonEventArgs(MouseButtonEventArgs&& other) = default;
+  MouseButtonEventArgs& operator=(const MouseButtonEventArgs& other) = default;
+  MouseButtonEventArgs& operator=(MouseButtonEventArgs&& other) = default;
+  ~MouseButtonEventArgs() override = default;
+
+  MouseButton GetMouseButton() const { return button_; }
+
+ private:
+  MouseButton button_;
+};
+
+class MouseWheelEventArgs : public MouseEventArgs {
+ public:
+  MouseWheelEventArgs(Object* sender, Object* original_sender,
+                      const Point& point, const float delta)
+      : MouseEventArgs(sender, original_sender, point), delta_(delta) {}
+  MouseWheelEventArgs(const MouseWheelEventArgs& other) = default;
+  MouseWheelEventArgs(MouseWheelEventArgs&& other) = default;
+  MouseWheelEventArgs& operator=(const MouseWheelEventArgs& other) = default;
+  MouseWheelEventArgs& operator=(MouseWheelEventArgs&& other) = default;
+  ~MouseWheelEventArgs() override = default;
+
+  float GetDelta() const { return delta_; }
+
+ private:
+  float delta_;
+};
+
+class PaintEventArgs : public UiEventArgs {
+ public:
+  PaintEventArgs(Object* sender, Object* original_sender,
+                 platform::graph::IPainter* painter)
+      : UiEventArgs(sender, original_sender), painter_(painter) {}
+  PaintEventArgs(const PaintEventArgs& other) = default;
+  PaintEventArgs(PaintEventArgs&& other) = default;
+  PaintEventArgs& operator=(const PaintEventArgs& other) = default;
+  PaintEventArgs& operator=(PaintEventArgs&& other) = default;
+  ~PaintEventArgs() = default;
+
+  platform::graph::IPainter* GetPainter() const { return painter_; }
+
+ private:
+  platform::graph::IPainter* painter_;
+};
+
+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_;
+};
+
+/*
+class ToggleEventArgs : public UiEventArgs {
+ public:
+  ToggleEventArgs(Object* sender, Object* original_sender, bool new_state)
+      : UiEventArgs(sender, original_sender), new_state_(new_state) {}
+  ToggleEventArgs(const ToggleEventArgs& other) = default;
+  ToggleEventArgs(ToggleEventArgs&& other) = default;
+  ToggleEventArgs& operator=(const ToggleEventArgs& other) = default;
+  ToggleEventArgs& operator=(ToggleEventArgs&& other) = default;
+  ~ToggleEventArgs() override = default;
+
+  bool GetNewState() const { return new_state_; }
+
+ private:
+  bool new_state_;
+};
+*/
+
+class KeyEventArgs : public UiEventArgs {
+ public:
+  KeyEventArgs(Object* sender, Object* original_sender, int virtual_code)
+      : UiEventArgs(sender, original_sender), virtual_code_(virtual_code) {}
+  KeyEventArgs(const KeyEventArgs& other) = default;
+  KeyEventArgs(KeyEventArgs&& other) = default;
+  KeyEventArgs& operator=(const KeyEventArgs& other) = default;
+  KeyEventArgs& operator=(KeyEventArgs&& other) = default;
+  ~KeyEventArgs() override = default;
+
+  int GetVirtualCode() const { return virtual_code_; }
+
+ private:
+  int virtual_code_;
+};
+
+/*
+class CharEventArgs : public UiEventArgs {
+ public:
+  CharEventArgs(Object* sender, Object* original_sender, wchar_t c)
+      : UiEventArgs(sender, original_sender), c_(c) {}
+  CharEventArgs(const CharEventArgs& other) = default;
+  CharEventArgs(CharEventArgs&& other) = default;
+  CharEventArgs& operator=(const CharEventArgs& other) = default;
+  CharEventArgs& operator=(CharEventArgs&& other) = default;
+  ~CharEventArgs() override = default;
+
+  wchar_t GetChar() const { return c_; }
+
+ private:
+  wchar_t c_;
+};
+*/
+}  // namespace cru::ui::event