From 452cc00e578cc023acc1ad6fde29111dda2ecfc6 Mon Sep 17 00:00:00 2001
From: anulax1225 <anulax1225@icloud.com>
Date: Thu, 18 Jan 2024 13:06:17 +0100
Subject: [PATCH] Added event abstraction

---
 bakara/src/bakara/events/app_event.h    | 20 +++++++
 bakara/src/bakara/events/event.cpp      | 24 ++++++++
 bakara/src/bakara/events/event.h        | 73 +++++++++++++++++++++++++
 bakara/src/bakara/events/key_event.h    |  0
 bakara/src/bakara/events/mouse_event.h  |  0
 bakara/src/bakara/events/window_event.h | 30 ++++++++++
 bakara/src/bakara/math/base.h           |  3 +
 7 files changed, 150 insertions(+)
 create mode 100644 bakara/src/bakara/events/app_event.h
 create mode 100644 bakara/src/bakara/events/event.cpp
 create mode 100644 bakara/src/bakara/events/event.h
 create mode 100644 bakara/src/bakara/events/key_event.h
 create mode 100644 bakara/src/bakara/events/mouse_event.h
 create mode 100644 bakara/src/bakara/events/window_event.h
 create mode 100644 bakara/src/bakara/math/base.h

diff --git a/bakara/src/bakara/events/app_event.h b/bakara/src/bakara/events/app_event.h
new file mode 100644
index 0000000..daf784d
--- /dev/null
+++ b/bakara/src/bakara/events/app_event.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include "event.h"
+
+namespace Bk {
+    class AppTickEvent : public Event 
+    {
+
+    }   
+
+    class AppRenderEvent : public Event 
+    {
+
+    }
+
+    class AppUpdateEvent : public Event 
+    {
+        
+    }
+}
\ No newline at end of file
diff --git a/bakara/src/bakara/events/event.cpp b/bakara/src/bakara/events/event.cpp
new file mode 100644
index 0000000..f35e5cd
--- /dev/null
+++ b/bakara/src/bakara/events/event.cpp
@@ -0,0 +1,24 @@
+#include "event.h"
+
+namespace Bk {
+    EventDispatcher::EventDispatcher(Event& event) 
+    {
+        p_event = event;
+    }
+
+    bool ventDispatcher::Dispatch(const F& func)
+    {
+        if (p_event.GetEventType() == T::GetStaticType())
+        {
+            p_event.handled |= func(static_cast<T&>(p_event));
+            return true;
+        }
+        return false;
+    }
+
+    inline std::ostream& operator<<(std::ostream& os, Event& e)  
+    {
+        return os << e.ToString();
+    }
+
+}
\ No newline at end of file
diff --git a/bakara/src/bakara/events/event.h b/bakara/src/bakara/events/event.h
new file mode 100644
index 0000000..8dafdce
--- /dev/null
+++ b/bakara/src/bakara/events/event.h
@@ -0,0 +1,73 @@
+#pragma once
+
+#include <bakara/math/base.h>
+
+namespace Bk {
+    enum class EventType 
+    {
+        None = 0,
+        AppTick,
+        AppUpdate,
+        AppRender,
+        WindowClose,
+        WindowResize,
+        WindowFocus,
+        WindowLostFocus,
+        WindowMove,
+        KeyPress,
+        KeyRelease,
+        KeyTyped,
+        MouseButtonPress,
+        MouseButtonRelease,
+        MouseMove,
+        MouseScroll
+    };
+
+    enum class EventCategory 
+    {
+        None = 0,
+        AppEvent = BIT_SHIFT(0),
+        InputEvent = BIT_SHIFT(1),
+        KeyboardEvent = BIT_SHIFT(2),
+        MouseEvent = BIT_SHIFT(3),
+        MouseButtonEvent = BIT_SHIFT(4)
+    };
+
+    #define EVENT_CLASS_TYPE(type) static EventType GetStaticType() { return EventType::type; }\
+								virtual EventType GetEventType() const override { return GetStaticType(); }\
+								virtual const char* GetName() const override { return #type; }
+
+    #define EVENT_CLASS_CATEGORY(category) virtual int GetCategoryFlags() const override { return category; }
+
+    class Event 
+    {
+        public:
+            virtual ~Event() = default;
+
+            bool handled = false;
+
+            virtual EventType GetEventType() const = 0;
+            virtual const char* GetName() const = 0;
+            virtual int GetCategoryFlags() const = 0;
+            virtual std::string ToString() const { return GetName(); }
+
+            bool IsInCategory(EventCategory category)
+            {
+                return GetCategoryFlags() & (int)category == GetCategoryFlags();
+            }
+    };
+    inline std::ostream& operator<<(std::ostream& os, Event& e);
+
+
+	class EventDispatcher
+	{
+        public:
+            EventDispatcher(Event& event);
+            
+            // F will be deduced by the compiler
+            template<typename T, typename F>
+            bool Dispatch(const F& func);
+        private:
+            Event& p_event;
+	};
+}
\ No newline at end of file
diff --git a/bakara/src/bakara/events/key_event.h b/bakara/src/bakara/events/key_event.h
new file mode 100644
index 0000000..e69de29
diff --git a/bakara/src/bakara/events/mouse_event.h b/bakara/src/bakara/events/mouse_event.h
new file mode 100644
index 0000000..e69de29
diff --git a/bakara/src/bakara/events/window_event.h b/bakara/src/bakara/events/window_event.h
new file mode 100644
index 0000000..b180cc2
--- /dev/null
+++ b/bakara/src/bakara/events/window_event.h
@@ -0,0 +1,30 @@
+pragma once
+
+#include "event.h"
+
+namespace Bk {
+    class WindowResizeEvent : public Event 
+    {
+
+    }   
+
+    class WindowCloseEvent : public Event 
+    {
+
+    }
+
+    class WindowFocusEvent : public Event 
+    {
+        
+    }
+
+    class WindowLostFocusEvent : public Event 
+    {
+
+    }
+
+    class WindowMoveEvent : public Event 
+    {
+        
+    }
+}
\ No newline at end of file
diff --git a/bakara/src/bakara/math/base.h b/bakara/src/bakara/math/base.h
new file mode 100644
index 0000000..01ab12b
--- /dev/null
+++ b/bakara/src/bakara/math/base.h
@@ -0,0 +1,3 @@
+#pragma once
+
+#define BIT_SHIFT(x) (1 << x)
\ No newline at end of file