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1 files changed, 39 insertions, 0 deletions

diff --git a/include/cru/ui/events/RoutedEvent.hpp b/include/cru/ui/events/RoutedEvent.hpp
new file mode 100644
index 00000000..0cedc671
--- /dev/null
+++ b/include/cru/ui/events/RoutedEvent.hpp
@@ -0,0 +1,39 @@
+#pragma once
+#include "UiEventArgs.hpp"
+
+#include "cru/common/Event.hpp"
+
+namespace cru::ui::events {
+// 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 RawEventArgs = TEventArgs;
+  using IEventType = IEvent<TEventArgs&>;
+  using EventArgs = typename IEventType::EventArgs;
+
+  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_;
+};
+}  // namespace cru::ui::event