8 files changed, 164 insertions, 11 deletions

diff --git a/src/crepe/api/Button.cpp b/src/crepe/api/Button.cpp
new file mode 100644
index 0000000..313ec4c
--- /dev/null
+++ b/src/crepe/api/Button.cpp
@@ -0,0 +1,11 @@
+#include "Button.h"
+
+namespace crepe {
+
+Button::Button(game_object_id_t id, const vec2& dimensions, const vec2& offset,
+			   const std::function<void()>& on_click, bool is_toggle)
+	: UIObject(id, dimensions, offset),
+	  is_toggle(is_toggle),
+	  on_click(on_click) {}
+
+} // namespace crepe
diff --git a/src/crepe/api/Button.h b/src/crepe/api/Button.h
new file mode 100644
index 0000000..baee71f
--- /dev/null
+++ b/src/crepe/api/Button.h
@@ -0,0 +1,79 @@
+#pragma once
+
+#include <functional>
+
+#include "UIObject.h"
+
+namespace crepe {
+
+/**
+ * \brief Represents a clickable UI button, derived from the UiObject class.
+ * 
+ */
+class Button : public UIObject {
+public:
+	/**
+     * \brief Constructs a Button with the specified game object ID and dimensions.
+     * 
+     * \param id The unique ID of the game object associated with this button.
+     * \param Dimensions The width and height of the UIObject
+     * \param offset The offset relative this GameObjects Transform
+     * \param is_toggle Optional flag to indicate if the button is a toggle button. Defaults to false.
+     * \param on_click callback function that will be invoked when the button is clicked.
+     */
+	Button(game_object_id_t id, const vec2 & dimensions, const vec2 & offset, const std::function<void()>& on_click,
+		   bool is_toggle = false);
+
+	/**
+     * \brief Indicates if the button is a toggle button (can be pressed and released).
+     * 
+     * A toggle button allows for a pressed/released state, whereas a regular button
+     * typically only has an on-click state.
+     */
+	bool is_toggle = false;
+
+	/**
+     * \brief The callback function to be executed when the button is clicked.
+     * 
+     * This function is invoked whenever the button is clicked. It can be set to any
+     * function that matches the signature `void()`.
+     */
+	std::function<void()> on_click = nullptr;
+
+	/**
+	 * \brief Callback function to be executed when the mouse enters the button's boundaries.
+	 *
+	 * This function is triggered when the mouse cursor moves over the button, allowing
+	 * custom actions like visual effects, highlighting, or sound effects.
+	 */
+	std::function<void()> on_mouse_enter = nullptr;
+
+	/**
+	 * \brief Callback function to be executed when the mouse exits the button's boundaries.
+	 *
+	 * This function is triggered when the mouse cursor moves out of the button's area,
+	 * allowing custom actions like resetting visual effects or playing exit-related effects.
+	 */
+	std::function<void()> on_mouse_exit = nullptr;
+
+private:
+	//! friend relation for is_pressed and hover variables
+	friend class InputSystem;
+	/**
+     * \brief Indicates whether the toggle button is pressed
+     * 
+     *  This state indicates if the toggle button is pressed or not
+     */
+	bool is_pressed = false;
+
+	/**
+     * \brief Indicates whether the mouse is currently hovering over the button.
+     * 
+     * This is set to true when the mouse is over the button and false otherwise.
+     */
+	bool hover = false;
+
+public:
+};
+
+} // namespace crepe
diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index 7da9dca..ac8f301 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -20,6 +20,8 @@ target_sources(crepe PUBLIC
 	Asset.cpp
 	EventHandler.cpp
 	Script.cpp
+	Button.cpp
+	UIObject.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -50,4 +52,6 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	LoopManager.h
 	LoopTimer.h
 	Asset.h
+	Button.h
+	UIObject.h
 )
diff --git a/src/crepe/api/Event.h b/src/crepe/api/Event.h
index b267e3e..6298118 100644
--- a/src/crepe/api/Event.h
+++ b/src/crepe/api/Event.h
@@ -88,9 +88,31 @@ public:
 
 	//! Y-coordinate of the mouse position at the time of the event.
 	int mouse_y = 0;
+
+	// Movement since last event in x
+	int delta_x = 0;
+
+	// Movement since last event in y
+	int delta_y = 0;
 };
 
 /**
+ * \brief Event triggered when the mouse is moved.
+ */
+class MouseScrollEvent : 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;
+
+	//! scroll direction (-1 = down, 1 = up)
+	int scroll_direction = 0;
+	//! scroll amount in y axis (from and away from the person).
+	float scroll_delta = 0;
+};
+/**
  * \brief Event triggered during a collision between objects.
  */
 class CollisionEvent : public Event {};
diff --git a/src/crepe/api/KeyCodes.h b/src/crepe/api/KeyCodes.h
index 9e173e0..fcfc080 100644
--- a/src/crepe/api/KeyCodes.h
+++ b/src/crepe/api/KeyCodes.h
@@ -1,5 +1,5 @@
 #pragma once
-
+namespace crepe {
 //! Enumeration for mouse button inputs, including standard and extended buttons.
 enum class MouseButton {
 	NONE = 0, //!< No mouse button input.
@@ -85,9 +85,9 @@ enum class Keycode {
 	PRINT_SCREEN = 283, //!< Print Screen key.
 	PAUSE = 284, //!< Pause key.
 	/**
-	 * \name Function keys (F1-F25).
-	 * \{
-	 */
+		 * \name Function keys (F1-F25).
+		 * \{
+		 */
 	F1 = 290,
 	F2 = 291,
 	F3 = 292,
@@ -115,9 +115,9 @@ enum class Keycode {
 	F25 = 314,
 	/// \}
 	/**
-	 * \name Keypad digits and operators.
-	 * \{
-	 */
+		 * \name Keypad digits and operators.
+		 * \{
+		 */
 	KP0 = 320,
 	KP1 = 321,
 	KP2 = 322,
@@ -137,9 +137,9 @@ enum class Keycode {
 	KP_EQUAL = 336,
 	/// \}
 	/**
-	 * \name Modifier keys.
-	 * \{
-	 */
+		 * \name Modifier keys.
+		 * \{
+		 */
 	LEFT_SHIFT = 340,
 	LEFT_CONTROL = 341,
 	LEFT_ALT = 342,
@@ -151,3 +151,4 @@ enum class Keycode {
 	/// \}
 	MENU = 348, //!< Menu key.
 };
+} // namespace crepe
diff --git a/src/crepe/api/LoopManager.cpp b/src/crepe/api/LoopManager.cpp
index 731cfb7..dc2d9e0 100644
--- a/src/crepe/api/LoopManager.cpp
+++ b/src/crepe/api/LoopManager.cpp
@@ -1,5 +1,6 @@
 #include "../system/AnimatorSystem.h"
 #include "../system/CollisionSystem.h"
+#include "../system/InputSystem.h"
 #include "../system/ParticleSystem.h"
 #include "../system/PhysicsSystem.h"
 #include "../system/RenderSystem.h"
@@ -20,9 +21,10 @@ LoopManager::LoopManager() {
 	this->load_system<PhysicsSystem>();
 	this->load_system<RenderSystem>();
 	this->load_system<ScriptSystem>();
+	this->load_system<InputSystem>();
 }
 
-void LoopManager::process_input() { this->sdl_context.handle_events(this->game_running); }
+void LoopManager::process_input() { this->get_system<InputSystem>().update(); }
 
 void LoopManager::start() {
 	this->setup();
diff --git a/src/crepe/api/UIObject.cpp b/src/crepe/api/UIObject.cpp
new file mode 100644
index 0000000..784328a
--- /dev/null
+++ b/src/crepe/api/UIObject.cpp
@@ -0,0 +1,8 @@
+#include "UIObject.h"
+
+using namespace crepe;
+
+UIObject::UIObject(game_object_id_t id, const vec2 & dimensions, const vec2 &offset)
+	: Component(id),
+	  dimensions(dimensions),
+	  offset(offset) {}
diff --git a/src/crepe/api/UIObject.h b/src/crepe/api/UIObject.h
new file mode 100644
index 0000000..614794d
--- /dev/null
+++ b/src/crepe/api/UIObject.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#include "../Component.h"
+
+namespace crepe {
+
+/**
+ * @class UiObject
+ * \brief Represents a UI object in the game, derived from the Component class.
+ */
+class UIObject : public Component {
+public:
+	/**
+     * \brief Constructs a UiObject with the specified game object ID.
+     * \param id The unique ID of the game object associated with this UI object.
+	 * \param dimensions width and height of the UIObject
+	 * \param offset Offset relative to the GameObject Transform
+     */
+	UIObject(game_object_id_t id, const vec2 & dimensions, const vec2 & offset);
+	//! Width and height of the UIObject
+	vec2 dimensions;
+	//! Position offset relative to this GameObjects Transform
+	vec2 offset;
+};
+
+} // namespace crepe