From 58a0d460094f26e1873767f033ace08e4e1eb70a Mon Sep 17 00:00:00 2001
From: Gordon McCann <gmccann@fsu.edu>
Date: Sun, 19 Dec 2021 15:11:24 -0500
Subject: [PATCH] Added Event system basics

---
 Navigator/src/Navigator/Application.cpp     |  16 ++-
 Navigator/src/Navigator/Application.h       |   8 +-
 Navigator/src/Navigator/Events/AppEvent.h   |  52 ++++++++++
 Navigator/src/Navigator/Events/Event.h      |  82 +++++++++++++++
 Navigator/src/Navigator/Events/KeyEvent.h   |  88 +++++++++++++++++
 Navigator/src/Navigator/Events/MouseEvent.h | 104 ++++++++++++++++++++
 Navigator/src/Navigator/NavCore.h           |   9 ++
 navigator.sublime-project                   |   2 +-
 premake5.lua                                |   9 +-
 9 files changed, 362 insertions(+), 8 deletions(-)
 create mode 100644 Navigator/src/Navigator/Events/AppEvent.h
 create mode 100644 Navigator/src/Navigator/Events/Event.h
 create mode 100644 Navigator/src/Navigator/Events/KeyEvent.h
 create mode 100644 Navigator/src/Navigator/Events/MouseEvent.h
 create mode 100644 Navigator/src/Navigator/NavCore.h

diff --git a/Navigator/src/Navigator/Application.cpp b/Navigator/src/Navigator/Application.cpp
index f170f71..07adf43 100644
--- a/Navigator/src/Navigator/Application.cpp
+++ b/Navigator/src/Navigator/Application.cpp
@@ -13,7 +13,18 @@ namespace Navigator {
 	Application::~Application() {}
 
 
-	void Application::OnEvent() {}
+	void Application::OnEvent(Event& event) 
+	{
+		EventDispatcher dispatch(event);
+		dispatch.Dispatch<WindowCloseEvent>(BIND_EVENT_FUNCTION(Application::OnWindowCloseEvent));
+	}
+
+	bool Application::OnWindowCloseEvent(WindowCloseEvent& event)
+	{
+		m_runFlag = false;
+		NAV_WARN("Closing the window!");
+		return true;
+	}
 
 	void Application::PushLayer() {}
 
@@ -24,7 +35,8 @@ namespace Navigator {
 		while(m_runFlag)
 		{
 			NAV_TRACE("Doing a run.");
-			m_runFlag = false;
+			WindowCloseEvent event;
+			OnEvent(event);
 		}
 	}
 }
\ No newline at end of file
diff --git a/Navigator/src/Navigator/Application.h b/Navigator/src/Navigator/Application.h
index a3cff1a..ab56843 100644
--- a/Navigator/src/Navigator/Application.h
+++ b/Navigator/src/Navigator/Application.h
@@ -1,6 +1,9 @@
 #ifndef APPLICATION_H
 #define APPLICATION_H
 
+#include "NavCore.h"
+#include "Events/Event.h"
+#include "Events/AppEvent.h"
 
 namespace Navigator {
 
@@ -12,7 +15,7 @@ namespace Navigator {
 
 		void Run();
 
-		void OnEvent();
+		void OnEvent(Event& event);
 		void PushLayer();
 		void PushOverlay();
 
@@ -21,7 +24,8 @@ namespace Navigator {
 		inline void GetWindow() { return; }
 
 	private:
-
+		bool OnWindowCloseEvent(WindowCloseEvent& event);
+		
 		bool m_runFlag;
 		
 		static Application* s_instance;
diff --git a/Navigator/src/Navigator/Events/AppEvent.h b/Navigator/src/Navigator/Events/AppEvent.h
new file mode 100644
index 0000000..443e600
--- /dev/null
+++ b/Navigator/src/Navigator/Events/AppEvent.h
@@ -0,0 +1,52 @@
+#ifndef APP_EVENT_H
+#define APP_EVENT_H
+
+#include "Event.h"
+
+namespace Navigator {
+
+	class WindowCloseEvent : public Event 
+	{
+	public:
+		WindowCloseEvent() {};
+
+		EVENT_CATEGORY_SETUP(EventCategoryApp)
+		EVENT_TYPE_SETUP(WindowClose)
+	};
+
+	class WindowResizeEvent : public Event 
+	{
+	public:
+		WindowResizeEvent(float x, float y) :
+			m_xSize(x), m_ySize(y)
+		{
+		}
+
+		inline float GetXSize() { return m_xSize; }
+		inline float GetYSize() { return m_ySize; }
+		std::string ToString() const override 
+		{
+			std::stringstream ss;
+			ss << GetName() << " to size: (" << m_xSize << ", " << m_ySize << ")";
+			return ss.str();
+		}
+
+		EVENT_CATEGORY_SETUP(EventCategoryApp)
+		EVENT_TYPE_SETUP(WindowResize)
+
+	private:
+		float m_xSize, m_ySize;
+	};
+
+	class AppUpdateEvent : public Event 
+	{
+	public:
+		AppUpdateEvent() = default;
+
+		EVENT_CATEGORY_SETUP(EventCategoryApp)
+		EVENT_TYPE_SETUP(AppUpdate)
+	};
+
+}
+
+#endif
\ No newline at end of file
diff --git a/Navigator/src/Navigator/Events/Event.h b/Navigator/src/Navigator/Events/Event.h
new file mode 100644
index 0000000..3b0796b
--- /dev/null
+++ b/Navigator/src/Navigator/Events/Event.h
@@ -0,0 +1,82 @@
+#ifndef EVENT_H
+#define EVENT_H
+
+#include "NavCore.h"
+#include <sstream>
+
+namespace Navigator {
+
+	enum class EventType
+	{
+		None=0,
+		WindowClose, WindowResize, WindowFocus, WindowLostFocus, WindowMoved,
+		KeyPressed, KeyReleased, KeyTyped,
+		MouseButtonPressed, MouseButtonReleased, MouseScrolled, MouseMoved,
+		AppUpdate
+	};
+
+	enum EventCategory
+	{
+		EventCategoryNone=0,
+		EventCategoryApp=BIT(0),
+		EventCategoryInput=BIT(1),
+		EventCategoryKey=BIT(2),
+		EventCategoryMouse=BIT(3),
+		EventCategoryWindow=BIT(4)
+	};
+
+	//Some function generation automation to reduce code written for all events
+	#define EVENT_CATEGORY_SETUP(cat) virtual int GetCategoryFlags() const override { return cat; }
+
+	#define EVENT_TYPE_SETUP(type) static EventType GetStaticType() { return EventType::type; } \
+								   virtual EventType GetEventType() const override { return GetStaticType(); } \
+								   virtual const char* GetName() const override { return #type; }
+
+	class Event
+	{
+		friend class EventDispatcher;
+	public:
+		virtual EventType GetEventType() const = 0;
+		virtual const char* GetName() const = 0;
+		virtual int GetCategoryFlags() const = 0;
+		virtual std::string ToString() const { return GetName(); }
+		inline bool IsCategory(EventCategory cat) const { return GetCategoryFlags() & cat; }
+		bool handledFlag = false;
+	};
+
+	class EventDispatcher
+	{
+		template<typename T>
+			using EventFunc = std::function<bool(T&)>;
+
+	public:
+		EventDispatcher(Event& e) :
+			m_event(e)
+		{
+		}
+
+		template<typename T>
+		bool Dispatch(EventFunc<T> function)
+		{
+			if(m_event.GetEventType() == T::GetStaticType())
+			{
+				m_event.handledFlag = function(*(T*)&m_event);
+				return true;
+			}
+			else
+			{
+				return false;
+			}
+		}
+
+	private:
+		Event& m_event;
+	};
+
+	inline std::ostream& operator<<(std::ostream& os, const Event& e)
+	{
+		return os << e.ToString();
+	}
+}
+
+#endif
\ No newline at end of file
diff --git a/Navigator/src/Navigator/Events/KeyEvent.h b/Navigator/src/Navigator/Events/KeyEvent.h
new file mode 100644
index 0000000..921b53f
--- /dev/null
+++ b/Navigator/src/Navigator/Events/KeyEvent.h
@@ -0,0 +1,88 @@
+#ifndef KEY_EVENT_H
+#define KEY_EVENT_H
+
+#include "Event.h"
+
+namespace Navigator {
+
+	class KeyEvent : public Event
+	{
+	public:
+		inline int GetKeycode() const { return m_keycode; }
+		EVENT_CATEGORY_SETUP(EventCategoryKey | EventCategoryInput)
+	protected:
+		KeyEvent(int code) :
+			m_keycode(code)
+		{
+		}
+
+		int m_keycode;
+
+	};
+
+	class KeyPressedEvent : public KeyEvent
+	{
+	public:
+		KeyPressedEvent(int code, int count) :
+			KeyEvent(code), m_repeatCount(count)
+		{
+		}
+
+		EVENT_TYPE_SETUP(KeyPressed)
+
+		inline int GetRepeatCount() const { return m_repeatCount; }
+
+		std::string ToString() const override
+		{
+			std::stringstream stream;
+			stream << GetName() << " with code "<<m_keycode << " pressed "<<m_repeatCount<<" times.";
+			return stream.str();
+		}
+
+
+	private:
+		int m_repeatCount;
+	};
+
+	class KeyReleasedEvent : public KeyEvent 
+	{
+	public:
+		KeyReleasedEvent(int code) :
+			KeyEvent(code)
+		{
+		};
+
+		EVENT_TYPE_SETUP(KeyReleased)
+
+		std::string ToString() const override 
+		{
+			std::stringstream ss;
+			ss << GetName() << " with code " << m_keycode;
+			return ss.str();
+		}
+
+	};
+
+	class KeyTypedEvent : public KeyEvent 
+	{
+	public:
+		KeyTypedEvent(int code) :
+			KeyEvent(code)
+		{
+		};
+
+		EVENT_TYPE_SETUP(KeyTyped)
+
+		unsigned int GetCharacter() { return (unsigned int)m_keycode; }
+
+		std::string ToString() const override 
+		{
+			std::stringstream ss;
+			ss << GetName() << " with code " << m_keycode;
+			return ss.str();
+		}
+
+	};
+}
+
+#endif
\ No newline at end of file
diff --git a/Navigator/src/Navigator/Events/MouseEvent.h b/Navigator/src/Navigator/Events/MouseEvent.h
new file mode 100644
index 0000000..8ded644
--- /dev/null
+++ b/Navigator/src/Navigator/Events/MouseEvent.h
@@ -0,0 +1,104 @@
+#ifndef MOUSE_EVENT_H
+#define MOUSE_EVENT_H
+
+
+#include "Event.h"
+
+namespace Navigator {
+
+	class MouseMovedEvent : public Event 
+	{
+	public:
+		MouseMovedEvent(float x, float y) :
+			m_xPos(x), m_yPos(y)
+		{
+		}
+
+		inline float GetXPosition() { return m_xPos; }
+		inline float GetYPosition() { return m_yPos; }
+		std::string ToString() const override 
+		{
+			std::stringstream ss;
+			ss << GetName() << " to position (" << m_xPos << ", " << m_yPos << ")";
+			return ss.str();
+		}
+
+		EVENT_CATEGORY_SETUP(EventCategoryMouse | EventCategoryInput)
+		EVENT_TYPE_SETUP(MouseMoved)
+
+	private:
+		float m_xPos, m_yPos;
+	};
+
+	class MouseScrolledEvent : public Event 
+	{
+	public:
+		MouseScrolledEvent(float x, float y) :
+			m_xOffset(x), m_yOffset(y)
+		{
+		}
+
+		inline float GetXOffset() { return m_xOffset; }
+		inline float GetYOffset() { return m_yOffset; }
+		std::string ToString() const override 
+		{
+			std::stringstream ss;
+			ss << GetName() << " to offset (" << m_xOffset << ", " << m_yOffset << ")";
+			return ss.str();
+		}
+
+		EVENT_CATEGORY_SETUP(EventCategoryMouse | EventCategoryInput)
+		EVENT_TYPE_SETUP(MouseScrolled)
+
+	private:
+		float m_xOffset, m_yOffset;
+	};
+
+	class MouseButtonPressedEvent : public Event 
+	{
+	public:
+		MouseButtonPressedEvent(int code) :
+			m_buttonCode(code)
+		{
+		}
+
+		inline int GetButtonCode() { return m_buttonCode; }
+		std::string ToString() const override 
+		{
+			std::stringstream ss;
+			ss << GetName() << " with button code " << m_buttonCode;
+			return ss.str();
+		}
+
+		EVENT_CATEGORY_SETUP(EventCategoryMouse | EventCategoryInput)
+		EVENT_TYPE_SETUP(MouseButtonPressed)
+
+	private:
+		int m_buttonCode;
+	};
+
+	class MouseButtonReleasedEvent : public Event 
+	{
+	public:
+		MouseButtonReleasedEvent(int code) :
+			m_buttonCode(code)
+		{
+		}
+
+		inline int GetButtonCode() { return m_buttonCode; }
+		std::string ToString() const override 
+		{
+			std::stringstream ss;
+			ss << GetName() << " with button code " << m_buttonCode;
+			return ss.str();
+		}
+
+		EVENT_CATEGORY_SETUP(EventCategoryMouse | EventCategoryInput)
+		EVENT_TYPE_SETUP(MouseButtonReleased)
+
+	private:
+		int m_buttonCode;
+	};
+}
+
+#endif
\ No newline at end of file
diff --git a/Navigator/src/Navigator/NavCore.h b/Navigator/src/Navigator/NavCore.h
new file mode 100644
index 0000000..98273a9
--- /dev/null
+++ b/Navigator/src/Navigator/NavCore.h
@@ -0,0 +1,9 @@
+#ifndef NAVCORE_H
+#define NAVCORE_H
+
+//Bit field setter
+#define BIT(x) (1<<x)
+
+#define BIND_EVENT_FUNCTION(x) std::bind(&x, this, std::placeholders::_1)
+
+#endif
\ No newline at end of file
diff --git a/navigator.sublime-project b/navigator.sublime-project
index dd94fca..7424d4d 100644
--- a/navigator.sublime-project
+++ b/navigator.sublime-project
@@ -7,6 +7,6 @@
 	],
 	"settings":
 	{
-		"SublimeLinter.linters.g++.args": ["-c","-Wall","-fsyntax-only","-std=c++17","-include${folder}/src/navpch.h","-Isrc/", "-Isrc/vendor/spdlog/include"]
+		"SublimeLinter.linters.g++.args": ["-c","-Wall","-fsyntax-only","-std=c++17","-include${folder}/Navigator/src/navpch.h","-INavigator/src/", "-INavigator/src/Navigator/","-INavigator/vendor/spdlog/include"]
 	}
 }
\ No newline at end of file
diff --git a/premake5.lua b/premake5.lua
index 450823c..93c9058 100644
--- a/premake5.lua
+++ b/premake5.lua
@@ -24,23 +24,25 @@ project "Navigator"
 	staticruntime "on"
 	targetdir ("lib/" .. outputdir .. "/%{prj.name}")
 	objdir ("bin-int/" .. outputdir .. "/%{prj.name}")
-	pchheader "navpch.h"
-	pchsource "Navigator/src/navpch.cpp"
 
 	filter "system:windows"
 		defines "NAV_WINDOWS"
+		pchheader "navpch.h"
+		pchsource "Navigator/src/navpch.cpp"
 		forceincludes {"navpch.h"}
 		includedirs {
 			"%{prj.name}/src/",
+			"%{prj.name}/src/%{prj.name}/",
 			"%{prj.name}/vendor/spdlog/include/",
 			"%{IncludeDirs.glfw}",
 			"%{IncludeDirs.ImGui}",
 		}
 	filter "system:linux or macosx"
 		defines "NAV_UNIX"
-		defines "NAV_PCH"
+		pchheader "%{prj.name}/src/navpch.h"
 		includedirs {
 			"%{prj.name}/vendor/spdlog/include/",
+			"%{prj.name}/src/%{prj.name}/",
 			"%{IncludeDirs.glfw}",
 			"%{IncludeDirs.ImGui}",
 		}
@@ -93,6 +95,7 @@ project "NavProject"
 
 	includedirs {
 		"Navigator/src",
+		"Navigator/src/Navigator",
 		"Navigator/vendor/spdlog/include/",
 		"Navigator/vendor"
 	}