13 files changed, 886 insertions, 0 deletions
diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index f9b370f..a185ca6 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -17,8 +17,12 @@ target_sources(crepe PUBLIC
 	Vector2.cpp
 	Camera.cpp
 	Animator.cpp
+	EventManager.cpp
+	IKeyListener.cpp
+	IMouseListener.cpp
 	LoopManager.cpp
 	LoopTimer.cpp
+	EventHandler.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -43,6 +47,13 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	SceneManager.hpp
 	Camera.h
 	Animator.h
+	EventManager.h
+	EventManager.hpp
+	EventHandler.h
+	EventHandler.hpp
+	Event.h
+	IKeyListener.h
+	IMouseListener.h
 	LoopManager.h
 	LoopTimer.h
 )
diff --git a/src/crepe/api/Event.h b/src/crepe/api/Event.h
new file mode 100644
index 0000000..06cf7f3
--- /dev/null
+++ b/src/crepe/api/Event.h
@@ -0,0 +1,112 @@
+// TODO discussing the location of these events
+#pragma once
+
+#include <string>
+
+#include "KeyCodes.h"
+
+/**
+ * \brief Base class for all event types in the system.
+ */
+class Event {};
+
+/**
+ * \brief Event triggered when a key is pressed.
+ */
+class KeyPressEvent : public Event {
+public:
+	//! false if first time press, true if key is repeated
+	bool repeat = false;
+
+	//! The key that was pressed.
+	Keycode key = Keycode::NONE;
+};
+
+/**
+ * \brief Event triggered when a key is released.
+ */
+class KeyReleaseEvent : public Event {
+public:
+	//! The key that was released.
+	Keycode key = Keycode::NONE;
+};
+
+/**
+ * \brief Event triggered when a mouse button is pressed.
+ */
+class MousePressEvent : public Event {
+public:
+	//! X-coordinate of the mouse position at the time of the event.
+	int mouse_x = 0;
+
+	//! Y-coordinate of the mouse position at the time of the event.
+	int mouse_y = 0;
+
+	//! The mouse button that was pressed.
+	MouseButton button = MouseButton::NONE;
+};
+
+/**
+ * \brief Event triggered when a mouse button is clicked (press and release).
+ */
+class MouseClickEvent : public Event {
+public:
+	//! X-coordinate of the mouse position at the time of the event.
+	int mouse_x = 0;
+
+	//! Y-coordinate of the mouse position at the time of the event.
+	int mouse_y = 0;
+
+	//! The mouse button that was clicked.
+	MouseButton button = MouseButton::NONE;
+};
+
+/**
+ * \brief Event triggered when a mouse button is released.
+ */
+class MouseReleaseEvent : public Event {
+public:
+	//! X-coordinate of the mouse position at the time of the event.
+	int mouse_x = 0;
+
+	//! Y-coordinate of the mouse position at the time of the event.
+	int mouse_y = 0;
+
+	//! The mouse button that was released.
+	MouseButton button = MouseButton::NONE;
+};
+
+/**
+ * \brief Event triggered when the mouse is moved.
+ */
+class MouseMoveEvent : public Event {
+public:
+	//! X-coordinate of the mouse position at the time of the event.
+	int mouse_x = 0;
+
+	//! Y-coordinate of the mouse position at the time of the event.
+	int mouse_y = 0;
+};
+
+/**
+ * \brief Event triggered during a collision between objects.
+ */
+class CollisionEvent : public Event {
+public:
+	//! Data describing the collision (currently not implemented).
+	// Collision collisionData;
+};
+
+/**
+ * \brief Event triggered when text is submitted, e.g., from a text input.
+ */
+class TextSubmitEvent : public Event {
+public:
+	//! The submitted text.
+	std::string text = "";
+};
+
+/**
+ * \brief Event triggered to indicate the application is shutting down.
+ */
+class ShutDownEvent : public Event {};
diff --git a/src/crepe/api/EventHandler.cpp b/src/crepe/api/EventHandler.cpp
new file mode 100644
index 0000000..4dc232f
--- /dev/null
+++ b/src/crepe/api/EventHandler.cpp
@@ -0,0 +1,5 @@
+#include "EventHandler.h"
+
+using namespace crepe;
+
+bool IEventHandlerWrapper::exec(const Event & e) { return this->call(e); }
diff --git a/src/crepe/api/EventHandler.h b/src/crepe/api/EventHandler.h
new file mode 100644
index 0000000..ef659fd
--- /dev/null
+++ b/src/crepe/api/EventHandler.h
@@ -0,0 +1,96 @@
+#pragma once
+
+#include <functional>
+#include <string>
+
+#include "Event.h"
+
+namespace crepe {
+/**
+ * \brief A type alias for an event handler function.
+ * 
+ * The EventHandler is a std::function that takes an EventType reference and returns a boolean value 
+ * indicating whether the event is handled.
+ * 
+ * \tparam EventType The type of event this handler will handle.
+ * 
+ * Returning \c false from an event handler results in the event being propogated to other listeners for the same event type, while returning \c true stops propogation altogether.
+ */
+template <typename EventType>
+using EventHandler = std::function<bool(const EventType & e)>;
+
+/**
+ * \class IEventHandlerWrapper
+ * \brief An abstract base class for event handler wrappers.
+ * 
+ * This class provides the interface for handling events. Derived classes must implement the
+ * `call()` method to process events
+ */
+class IEventHandlerWrapper {
+public:
+	/**
+     * \brief Virtual destructor for IEventHandlerWrapper.
+     */
+	virtual ~IEventHandlerWrapper() = default;
+
+	/**
+     * \brief Executes the handler with the given event.
+     * 
+     * This method calls the `call()` method of the derived class, passing the event to the handler.
+     * 
+     * \param e The event to be processed.
+     * \return A boolean value indicating whether the event is handled.
+     */
+	bool exec(const Event & e);
+
+private:
+	/**
+     * \brief The method responsible for handling the event.
+     * 
+     * This method is implemented by derived classes to process the event.
+     * 
+     * \param e The event to be processed.
+     * \return A boolean value indicating whether the event is handled.
+     */
+	virtual bool call(const Event & e) = 0;
+};
+
+/**
+ * \class EventHandlerWrapper
+ * \brief A wrapper for event handler functions.
+ * 
+ * This class wraps an event handler function of a specific event type. It implements the 
+ * `call()` and `get_type()` methods to allow the handler to be executed and its type to be 
+ * queried.
+ * 
+ * \tparam EventType The type of event this handler will handle.
+ */
+template <typename EventType>
+class EventHandlerWrapper : public IEventHandlerWrapper {
+public:
+	/**
+     * \brief Constructs an EventHandlerWrapper with a given handler.
+     * 
+     * The constructor takes an event handler function and stores it in the wrapper.
+     * 
+     * \param handler The event handler function.
+     */
+	explicit EventHandlerWrapper(const EventHandler<EventType> & handler);
+
+private:
+	/**
+     * \brief Calls the stored event handler with the event.
+     * 
+     * This method casts the event to the appropriate type and calls the handler.
+     * 
+     * \param e The event to be handled.
+     * \return A boolean value indicating whether the event is handled.
+     */
+	bool call(const Event & e) override;
+	//! The event handler function.
+	EventHandler<EventType> handler;
+};
+
+} // namespace crepe
+
+#include "EventHandler.hpp"
diff --git a/src/crepe/api/EventHandler.hpp b/src/crepe/api/EventHandler.hpp
new file mode 100644
index 0000000..391dcca
--- /dev/null
+++ b/src/crepe/api/EventHandler.hpp
@@ -0,0 +1,18 @@
+#include <typeindex>
+
+#include "EventHandler.h"
+
+namespace crepe {
+
+// Implementation of EventHandlerWrapper constructor
+template <typename EventType>
+EventHandlerWrapper<EventType>::EventHandlerWrapper(const EventHandler<EventType> & handler)
+	: handler(handler) {}
+
+// Implementation of EventHandlerWrapper::call
+template <typename EventType>
+bool EventHandlerWrapper<EventType>::call(const Event & e) {
+	return this->handler(static_cast<const EventType &>(e));
+}
+
+} //namespace crepe
diff --git a/src/crepe/api/EventManager.cpp b/src/crepe/api/EventManager.cpp
new file mode 100644
index 0000000..993db86
--- /dev/null
+++ b/src/crepe/api/EventManager.cpp
@@ -0,0 +1,54 @@
+#include "EventManager.h"
+
+using namespace crepe;
+
+EventManager & EventManager::get_instance() {
+	static EventManager instance;
+	return instance;
+}
+
+void EventManager::dispatch_events() {
+	for (auto event_it = this->events_queue.begin(); event_it != this->events_queue.end();) {
+		std::unique_ptr<Event> & event = (*event_it).event;
+		int channel = (*event_it).channel;
+		std::type_index event_type = (*event_it).type;
+
+		bool event_handled = false;
+		auto handlers_it = this->subscribers.find(event_type);
+		if (handlers_it == this->subscribers.end()) {
+			continue;
+		}
+		std::vector<CallbackEntry> & handlers = handlers_it->second;
+
+		for (auto handler_it = handlers.begin(); handler_it != handlers.end(); ++handler_it) {
+			// If callback is executed and returns true, remove the event from the queue
+			if ((*handler_it).callback->exec(*event)) {
+				event_it = this->events_queue.erase(event_it);
+				event_handled = true;
+				break;
+			}
+		}
+
+		if (!event_handled) {
+			++event_it;
+		}
+	}
+}
+
+void EventManager::clear() {
+	this->subscribers.clear();
+	this->events_queue.clear();
+}
+
+void EventManager::unsubscribe(subscription_t event_id) {
+	for (auto & [event_type, handlers] : this->subscribers) {
+		for (auto it = handlers.begin(); it != handlers.end();) {
+			if (it->id == event_id) {
+				it = handlers.erase(it);
+				return;
+			} else {
+				++it;
+			}
+		}
+	}
+}
diff --git a/src/crepe/api/EventManager.h b/src/crepe/api/EventManager.h
new file mode 100644
index 0000000..bd9772a
--- /dev/null
+++ b/src/crepe/api/EventManager.h
@@ -0,0 +1,142 @@
+#pragma once
+
+#include <functional>
+#include <memory>
+#include <type_traits>
+#include <typeindex>
+#include <unordered_map>
+#include <vector>
+
+#include "Event.h"
+#include "EventHandler.h"
+
+namespace crepe {
+//! typedef for subscription value
+typedef int subscription_t;
+
+/**
+ * \class EventManager
+ * \brief Manages event subscriptions, triggers, and queues, enabling decoupled event handling.
+ * 
+ * The `EventManager` acts as a centralized event system. It allows for registering callbacks
+ * for specific event types, triggering events synchronously, queueing events for later
+ * processing, and managing subscriptions via unique identifiers.
+ */
+class EventManager {
+public:
+	static constexpr int CHANNEL_ALL = -1;
+
+	/**
+	 * \brief Get the singleton instance of the EventManager.
+	 * 
+	 * This method returns the unique instance of the EventManager, creating it if it
+	 * doesn't already exist. Ensures only one instance is active in the program.
+	 * 
+	 * \return Reference to the singleton instance of the EventManager.
+	 */
+	static EventManager & get_instance();
+
+	/**
+	 * \brief Subscribe to a specific event type.
+	 * 
+	 * Registers a callback for a given event type and optional channel. Each callback
+	 * is assigned a unique subscription ID that can be used for later unsubscription.
+	 * 
+	 * \tparam EventType The type of the event to subscribe to.
+	 * \param callback The callback function to be invoked when the event is triggered.
+	 * \param channel The channel number to subscribe to (default is CHANNEL_ALL, which listens to all channels).
+	 * \return A unique subscription ID associated with the registered callback.
+	 */
+	template <typename EventType>
+	subscription_t subscribe(const EventHandler<EventType> & callback,
+							 int channel = CHANNEL_ALL);
+
+	/**
+	 * \brief Unsubscribe a previously registered callback.
+	 * 
+	 * Removes a callback from the subscription list based on its unique subscription ID.
+	 * 
+	 * \param event_id The unique subscription ID of the callback to remove.
+	 */
+	void unsubscribe(subscription_t event_id);
+
+	/**
+	 * \brief Trigger an event immediately.
+	 * 
+	 * Synchronously invokes all registered callbacks for the given event type on the specified channel.
+	 * 
+	 * \tparam EventType The type of the event to trigger.
+	 * \param event The event instance to pass to the callbacks.
+	 * \param channel The channel to trigger the event on (default is CHANNEL_ALL, which triggers on all channels).
+	 */
+	template <typename EventType>
+	void trigger_event(const EventType & event, int channel = CHANNEL_ALL);
+
+	/**
+	 * \brief Queue an event for later processing.
+	 * 
+	 * Adds an event to the event queue to be processed during the next call to `dispatch_events`.
+	 * 
+	 * \tparam EventType The type of the event to queue.
+	 * \param event The event instance to queue.
+	 * \param channel The channel to associate with the event (default is CHANNEL_ALL).
+	 */
+	template <typename EventType>
+	void queue_event(const EventType & event, int channel = CHANNEL_ALL);
+
+	/**
+	 * \brief Process all queued events.
+	 * 
+	 * Iterates through the event queue and triggers callbacks for each queued event.
+	 * Events are removed from the queue once processed.
+	 */
+	void dispatch_events();
+
+	/**
+	 * \brief Clear all subscriptions.
+	 * 
+	 * Removes all registered event handlers and clears the subscription list.
+	 */
+	void clear();
+
+private:
+	/**
+	 * \brief Default constructor for the EventManager.
+	 * 
+	 * Constructor is private to enforce the singleton pattern.
+	 */
+	EventManager() = default;
+
+	/**
+	 * \struct QueueEntry
+	 * \brief Represents an entry in the event queue.
+	 */
+	struct QueueEntry {
+		std::unique_ptr<Event> event; ///< The event instance.
+		int channel = CHANNEL_ALL; ///< The channel associated with the event.
+		std::type_index type; ///< The type of the event.
+	};
+
+	/**
+	 * \struct CallbackEntry
+	 * \brief Represents a registered event handler callback.
+	 */
+	struct CallbackEntry {
+		std::unique_ptr<IEventHandlerWrapper> callback; ///< The callback function wrapper.
+		int channel = CHANNEL_ALL; ///< The channel this callback listens to.
+		subscription_t id = -1; ///< Unique subscription ID.
+	};
+
+	//! The queue of events to be processed during dispatch.
+	std::vector<QueueEntry> events_queue;
+
+	//! A map of event type to registered callbacks.
+	std::unordered_map<std::type_index, std::vector<CallbackEntry>> subscribers;
+
+	//! Counter to generate unique subscription IDs.
+	subscription_t subscription_counter = 0;
+};
+
+} // namespace crepe
+
+#include "EventManager.hpp"
diff --git a/src/crepe/api/EventManager.hpp b/src/crepe/api/EventManager.hpp
new file mode 100644
index 0000000..b2a94bd
--- /dev/null
+++ b/src/crepe/api/EventManager.hpp
@@ -0,0 +1,48 @@
+#include "EventManager.h"
+
+namespace crepe {
+
+template <typename EventType>
+subscription_t EventManager::subscribe(const EventHandler<EventType> & callback, int channel) {
+	subscription_counter++;
+	std::type_index event_type = typeid(EventType);
+	std::unique_ptr<EventHandlerWrapper<EventType>> handler
+		= std::make_unique<EventHandlerWrapper<EventType>>(callback);
+	std::vector<CallbackEntry> & handlers = this->subscribers[event_type];
+	handlers.emplace_back(CallbackEntry{
+		.callback = std::move(handler), .channel = channel, .id = subscription_counter});
+	return subscription_counter;
+}
+
+template <typename EventType>
+void EventManager::queue_event(const EventType & event, int channel) {
+	static_assert(std::is_base_of<Event, EventType>::value,
+				  "EventType must derive from Event");
+	std::type_index event_type = typeid(EventType);
+
+	auto event_ptr = std::make_unique<EventType>(event);
+
+	this->events_queue.push_back(
+		QueueEntry{.event = std::move(event_ptr), .channel = channel, .type = event_type});
+}
+
+template <typename EventType>
+void EventManager::trigger_event(const EventType & event, int channel) {
+	std::type_index event_type = typeid(EventType);
+
+	auto handlers_it = this->subscribers.find(event_type);
+	if (handlers_it != this->subscribers.end()) {
+		const std::vector<CallbackEntry> & handlers = handlers_it->second;
+
+		for (const CallbackEntry & handler : handlers) {
+			if (handler.channel != channel && handler.channel != CHANNEL_ALL) {
+				continue;
+			}
+			if (handler.callback->exec(event)) {
+				break;
+			}
+		}
+	}
+}
+
+} // namespace crepe
diff --git a/src/crepe/api/IKeyListener.cpp b/src/crepe/api/IKeyListener.cpp
new file mode 100644
index 0000000..7aefaf7
--- /dev/null
+++ b/src/crepe/api/IKeyListener.cpp
@@ -0,0 +1,18 @@
+#include "IKeyListener.h"
+
+using namespace crepe;
+
+// Constructor with specified channel
+IKeyListener::IKeyListener(int channel) : event_manager(EventManager::get_instance()) {
+	this->press_id = event_manager.subscribe<KeyPressEvent>(
+		[this](const KeyPressEvent & event) { return this->on_key_pressed(event); }, channel);
+	this->release_id = event_manager.subscribe<KeyReleaseEvent>(
+		[this](const KeyReleaseEvent & event) { return this->on_key_released(event); },
+		channel);
+}
+
+// Destructor, unsubscribe events
+IKeyListener::~IKeyListener() {
+	event_manager.unsubscribe(this->press_id);
+	event_manager.unsubscribe(this->release_id);
+}
diff --git a/src/crepe/api/IKeyListener.h b/src/crepe/api/IKeyListener.h
new file mode 100644
index 0000000..2a89cbc
--- /dev/null
+++ b/src/crepe/api/IKeyListener.h
@@ -0,0 +1,49 @@
+#pragma once
+
+#include "Event.h"
+#include "EventHandler.h"
+#include "EventManager.h"
+
+namespace crepe {
+
+/**
+ * \class IKeyListener
+ * \brief Interface for keyboard event handling in the application.
+ */
+class IKeyListener {
+public:
+	/**
+     * \brief Constructs an IKeyListener with a specified channel.
+     * \param channel The channel ID for event handling.
+     */
+	IKeyListener(int channel = EventManager::CHANNEL_ALL);
+	virtual ~IKeyListener();
+	IKeyListener(const IKeyListener &) = delete;
+	IKeyListener & operator=(const IKeyListener &) = delete;
+	IKeyListener & operator=(IKeyListener &&) = delete;
+	IKeyListener(IKeyListener &&) = delete;
+
+	/**
+     * \brief Pure virtual function to handle key press events.
+     * \param event The key press event to handle.
+     * \return True if the event was handled, false otherwise.
+     */
+	virtual bool on_key_pressed(const KeyPressEvent & event) = 0;
+
+	/**
+     * \brief Pure virtual function to handle key release events.
+     * \param event The key release event to handle.
+     * \return True if the event was handled, false otherwise.
+     */
+	virtual bool on_key_released(const KeyReleaseEvent & event) = 0;
+
+private:
+	//! Key press event id
+	subscription_t press_id = -1;
+	//! Key release event id
+	subscription_t release_id = -1;
+	//! EventManager reference
+	EventManager & event_manager;;
+};
+
+} // namespace crepe
diff --git a/src/crepe/api/IMouseListener.cpp b/src/crepe/api/IMouseListener.cpp
new file mode 100644
index 0000000..7d38280
--- /dev/null
+++ b/src/crepe/api/IMouseListener.cpp
@@ -0,0 +1,28 @@
+#include "IMouseListener.h"
+
+using namespace crepe;
+
+IMouseListener::IMouseListener(int channel) : event_manager(EventManager::get_instance()) {
+	this->click_id = event_manager.subscribe<MouseClickEvent>(
+		[this](const MouseClickEvent & event) { return this->on_mouse_clicked(event); },
+		channel);
+
+	this->press_id = event_manager.subscribe<MousePressEvent>(
+		[this](const MousePressEvent & event) { return this->on_mouse_pressed(event); },
+		channel);
+
+	this->release_id = event_manager.subscribe<MouseReleaseEvent>(
+		[this](const MouseReleaseEvent & event) { return this->on_mouse_released(event); },
+		channel);
+
+	this->move_id = event_manager.subscribe<MouseMoveEvent>(
+		[this](const MouseMoveEvent & event) { return this->on_mouse_moved(event); }, channel);
+}
+
+IMouseListener::~IMouseListener() {
+	// Unsubscribe event handlers
+	event_manager.unsubscribe(this->click_id);
+	event_manager.unsubscribe(this->press_id);
+	event_manager.unsubscribe(this->release_id);
+	event_manager.unsubscribe(this->move_id);
+}
diff --git a/src/crepe/api/IMouseListener.h b/src/crepe/api/IMouseListener.h
new file mode 100644
index 0000000..91b33e1
--- /dev/null
+++ b/src/crepe/api/IMouseListener.h
@@ -0,0 +1,72 @@
+#pragma once
+
+#include "Event.h"
+#include "EventHandler.h"
+#include "EventManager.h"
+
+namespace crepe {
+
+/**
+ * \class IMouseListener
+ * \brief Interface for mouse event handling in the application.
+ */
+class IMouseListener {
+public:
+	/**
+     * \brief Constructs an IMouseListener with a specified channel.
+     * \param channel The channel ID for event handling.
+     */
+	IMouseListener(int channel = EventManager::CHANNEL_ALL);
+	virtual ~IMouseListener();
+	IMouseListener & operator=(const IMouseListener &) = delete;
+	IMouseListener(const IMouseListener &) = delete;
+	IMouseListener & operator=(const IMouseListener &&) = delete;
+	IMouseListener(IMouseListener &&) = delete;
+
+	/**
+     * \brief Move assignment operator (deleted).
+     */
+	IMouseListener & operator=(IMouseListener &&) = delete;
+
+	/**
+     * \brief Handles a mouse click event.
+     * \param event The mouse click event to handle.
+     * \return True if the event was handled, false otherwise.
+     */
+	virtual bool on_mouse_clicked(const MouseClickEvent & event) = 0;
+
+	/**
+     * \brief Handles a mouse press event.
+     * \param event The mouse press event to handle.
+     * \return True if the event was handled, false otherwise.
+     */
+	virtual bool on_mouse_pressed(const MousePressEvent & event) = 0;
+
+	/**
+     * \brief Handles a mouse release event.
+     * \param event The mouse release event to handle.
+     * \return True if the event was handled, false otherwise.
+     */
+	virtual bool on_mouse_released(const MouseReleaseEvent & event) = 0;
+
+	/**
+     * \brief Handles a mouse move event.
+     * \param event The mouse move event to handle.
+     * \return True if the event was handled, false otherwise.
+     */
+	virtual bool on_mouse_moved(const MouseMoveEvent & event) = 0;
+
+private:
+	//! Mouse click event id
+	subscription_t click_id = -1;
+	//! Mouse press event id
+	subscription_t press_id = -1;
+	//! Mouse release event id
+	subscription_t release_id = -1;
+	//! Mouse move event id
+	subscription_t move_id = -1;
+	//! EventManager reference
+	EventManager & event_manager;
+};
+
+} //namespace crepe
diff --git a/src/crepe/api/KeyCodes.h b/src/crepe/api/KeyCodes.h
new file mode 100644
index 0000000..16c2108
--- /dev/null
+++ b/src/crepe/api/KeyCodes.h
@@ -0,0 +1,233 @@
+#pragma once
+
+//! Enumeration for mouse button inputs, including standard and extended buttons.
+enum class MouseButton {
+	//! No mouse button input.
+	NONE = 0,
+	//! Left mouse button.
+	LEFT_MOUSE = 1,
+	//! Right mouse button.
+	RIGHT_MOUSE = 2,
+	//! Middle mouse button (scroll wheel press).
+	MIDDLE_MOUSE = 3,
+	//! First extended mouse button.
+	X1_MOUSE = 4,
+	//! Second extended mouse button.
+	X2_MOUSE = 5,
+	//! Scroll wheel upward movement.
+	SCROLL_UP = 6,
+	//! Scroll wheel downward movement.
+	SCROLL_DOWN = 7,
+};
+
+//! Enumeration for keyboard key inputs, including printable characters, function keys, and keypad keys.
+enum class Keycode {
+	//! No key input.
+	NONE = 0,
+	//! Spacebar.
+	SPACE = 32,
+	//! Apostrophe (').
+	APOSTROPHE = 39,
+	//! Comma (,).
+	COMMA = 44,
+	//! Minus (-).
+	MINUS = 45,
+	//! Period (.).
+	PERIOD = 46,
+	//! Slash (/).
+	SLASH = 47,
+	//! Digit 0.
+	D0 = 48,
+	//! Digit 1.
+	D1 = 49,
+	//! Digit 2.
+	D2 = 50,
+	//! Digit 3.
+	D3 = 51,
+	//! Digit 4.
+	D4 = 52,
+	//! Digit 5.
+	D5 = 53,
+	//! Digit 6.
+	D6 = 54,
+	//! Digit 7.
+	D7 = 55,
+	//! Digit 8.
+	D8 = 56,
+	//! Digit 9.
+	D9 = 57,
+	//! Semicolon (;).
+	SEMICOLON = 59,
+	//! Equal sign (=).
+	EQUAL = 61,
+	//! Key 'A'.
+	A = 65,
+	//! Key 'B'.
+	B = 66,
+	//! Key 'C'.
+	C = 67,
+	//! Key 'D'.
+	D = 68,
+	//! Key 'E'.
+	E = 69,
+	//! Key 'F'.
+	F = 70,
+	//! Key 'G'.
+	G = 71,
+	//! Key 'H'.
+	H = 72,
+	//! Key 'I'.
+	I = 73,
+	//! Key 'J'.
+	J = 74,
+	//! Key 'K'.
+	K = 75,
+	//! Key 'L'.
+	L = 76,
+	//! Key 'M'.
+	M = 77,
+	//! Key 'N'.
+	N = 78,
+	//! Key 'O'.
+	O = 79,
+	//! Key 'P'.
+	P = 80,
+	//! Key 'Q'.
+	Q = 81,
+	//! Key 'R'.
+	R = 82,
+	//! Key 'S'.
+	S = 83,
+	//! Key 'T'.
+	T = 84,
+	//! Key 'U'.
+	U = 85,
+	//! Key 'V'.
+	V = 86,
+	//! Key 'W'.
+	W = 87,
+	//! Key 'X'.
+	X = 88,
+	//! Key 'Y'.
+	Y = 89,
+	//! Key 'Z'.
+	Z = 90,
+	//! Left bracket ([).
+	LEFT_BRACKET = 91,
+	//! Backslash (\).
+	BACKSLASH = 92,
+	//! Right bracket (]).
+	RIGHT_BRACKET = 93,
+	//! Grave accent (`).
+	GRAVE_ACCENT = 96,
+	//! Non-US key #1.
+	WORLD1 = 161,
+	//! Non-US key #2.
+	WORLD2 = 162,
+	//! Escape key.
+	ESCAPE = 256,
+	//! Enter key.
+	ENTER = 257,
+	//! Tab key.
+	TAB = 258,
+	//! Backspace key.
+	BACKSPACE = 259,
+	//! Insert key.
+	INSERT = 260,
+	//! Delete key.
+	DELETE = 261,
+	//! Right arrow key.
+	RIGHT = 262,
+	//! Left arrow key.
+	LEFT = 263,
+	//! Down arrow key.
+	DOWN = 264,
+	//! Up arrow key.
+	UP = 265,
+	//! Page Up key.
+	PAGE_UP = 266,
+	//! Page Down key.
+	PAGE_DOWN = 267,
+	//! Home key.
+	HOME = 268,
+	//! End key.
+	END = 269,
+	//! Caps Lock key.
+	CAPS_LOCK = 280,
+	//! Scroll Lock key.
+	SCROLL_LOCK = 281,
+	//! Num Lock key.
+	NUM_LOCK = 282,
+	//! Print Screen key.
+	PRINT_SCREEN = 283,
+	//! Pause key.
+	PAUSE = 284,
+	/**
+	 * \name Function keys (F1-F25).
+	 * \{
+	 */
+	F1 = 290,
+	F2 = 291,
+	F3 = 292,
+	F4 = 293,
+	F5 = 294,
+	F6 = 295,
+	F7 = 296,
+	F8 = 297,
+	F9 = 298,
+	F10 = 299,
+	F11 = 300,
+	F12 = 301,
+	F13 = 302,
+	F14 = 303,
+	F15 = 304,
+	F16 = 305,
+	F17 = 306,
+	F18 = 307,
+	F19 = 308,
+	F20 = 309,
+	F21 = 310,
+	F22 = 311,
+	F23 = 312,
+	F24 = 313,
+	F25 = 314,
+	/// \}
+	/**
+	 * \name Keypad digits and operators.
+	 * \{
+	 */
+	KP0 = 320,
+	KP1 = 321,
+	KP2 = 322,
+	KP3 = 323,
+	KP4 = 324,
+	KP5 = 325,
+	KP6 = 326,
+	KP7 = 327,
+	KP8 = 328,
+	KP9 = 329,
+	KP_DECIMAL = 330,
+	KP_DIVIDE = 331,
+	KP_MULTIPLY = 332,
+	KP_SUBTRACT = 333,
+	KP_ADD = 334,
+	KP_ENTER = 335,
+	KP_EQUAL = 336,
+	/// \}
+	/**
+	 * \name Modifier keys.
+	 * \{
+	 */
+	//! Modifier keys.
+	LEFT_SHIFT = 340,
+	LEFT_CONTROL = 341,
+	LEFT_ALT = 342,
+	LEFT_SUPER = 343,
+	RIGHT_SHIFT = 344,
+	RIGHT_CONTROL = 345,
+	RIGHT_ALT = 346,
+	RIGHT_SUPER = 347,
+	/// \}
+	//! Menu key.
+	MENU = 348,
+};