1 files changed, 144 insertions, 0 deletions
diff --git a/src/crepe/system/InputSystem.cpp b/src/crepe/system/InputSystem.cpp
new file mode 100644
index 0000000..070f804
--- /dev/null
+++ b/src/crepe/system/InputSystem.cpp
@@ -0,0 +1,144 @@
+#include "ComponentManager.h"
+#include "api/Button.h"
+#include "api/EventManager.h"
+
+#include "InputSystem.h"
+
+using namespace crepe;
+
+void InputSystem::update() {
+	EventManager & event_mgr = EventManager::get_instance();
+	std::vector<SDLContext::EventData> event_list = SDLContext::get_instance().get_events();
+
+	for (const SDLContext::EventData & event : event_list) {
+		switch (event.event_type) {
+			case SDLContext::EventType::KEYDOWN:
+				event_mgr.queue_event<KeyPressEvent>(KeyPressEvent{
+					.repeat = event.key_repeat,
+					.key = event.key,
+				});
+				break;
+			case SDLContext::EventType::KEYUP:
+				event_mgr.queue_event<KeyReleaseEvent>(KeyReleaseEvent{
+					.key = event.key,
+				});
+				break;
+			case SDLContext::EventType::MOUSEDOWN:
+				event_mgr.queue_event<MousePressEvent>(MousePressEvent{
+					.mouse_x = event.mouse_position.first,
+					.mouse_y = event.mouse_position.second,
+					.button = event.mouse_button,
+				});
+				last_mouse_down_position = event.mouse_position;
+				last_mouse_button = event.mouse_button;
+				break;
+			case SDLContext::EventType::MOUSEUP: {
+				event_mgr.queue_event<MouseReleaseEvent>(MouseReleaseEvent{
+					.mouse_x = event.mouse_position.first,
+					.mouse_y = event.mouse_position.second,
+					.button = event.mouse_button,
+				});
+
+				int delta_x = event.mouse_position.first - last_mouse_down_position.first;
+				int delta_y = event.mouse_position.second - last_mouse_down_position.second;
+
+				if (last_mouse_button == event.mouse_button
+					&& std::abs(delta_x) <= click_tolerance
+					&& std::abs(delta_y) <= click_tolerance) {
+					event_mgr.queue_event<MouseClickEvent>(MouseClickEvent{
+						.mouse_x = event.mouse_position.first,
+						.mouse_y = event.mouse_position.second,
+						.button = event.mouse_button,
+					});
+
+					handle_click(event);
+				}
+			} break;
+			case SDLContext::EventType::MOUSEMOVE:
+				event_mgr.queue_event<MouseMoveEvent>(MouseMoveEvent{
+					.mouse_x = event.mouse_position.first,
+					.mouse_y = event.mouse_position.second,
+					.rel_x = event.rel_mouse_move.first,
+					.rel_y = event.rel_mouse_move.second,
+				});
+				handle_move(event);
+				break;
+			case SDLContext::EventType::MOUSEWHEEL:
+				event_mgr.queue_event<MouseScrollEvent>(MouseScrollEvent{
+					.scroll_x = event.wheel_delta,
+					.scroll_y = 0,
+					.direction = event.wheel_delta,
+				});
+				break;
+			case SDLContext::EventType::SHUTDOWN:
+				event_mgr.queue_event<ShutDownEvent>(ShutDownEvent{});
+				break;
+			default:
+				break;
+		}
+	}
+}
+
+void InputSystem::handle_move(const SDLContext::EventData & event_data) {
+	ComponentManager & mgr = this->component_manager;
+
+	RefVector<Button> buttons = mgr.get_components_by_type<Button>();
+	RefVector<Transform> transforms = mgr.get_components_by_type<Transform>();
+
+	for (Button & button : buttons) {
+		OptionalRef<Transform> transform = find_transform_for_button(button, transforms);
+		if (!transform) continue;
+
+		if (button.active && is_mouse_inside_button(event_data, button, transform)) {
+			button.hover = true;
+		} else {
+			button.hover = false;
+		}
+	}
+}
+
+void InputSystem::handle_click(const SDLContext::EventData & event_data) {
+	ComponentManager & mgr = this->component_manager;
+
+	RefVector<Button> buttons = mgr.get_components_by_type<Button>();
+	RefVector<Transform> transforms = mgr.get_components_by_type<Transform>();
+
+	for (Button & button : buttons) {
+		OptionalRef<Transform> transform_ref = find_transform_for_button(button, transforms);
+
+		if (button.active && is_mouse_inside_button(event_data, button, transform_ref)) {
+			handle_button_press(button);
+		}
+	}
+}
+
+OptionalRef<Transform>
+InputSystem::find_transform_for_button(Button & button, RefVector<Transform> & transforms) {
+
+	for (auto & transform : transforms) {
+		if (button.game_object_id == transform.get().game_object_id) {
+			return OptionalRef<Transform>(transform);
+		}
+	}
+
+	return OptionalRef<Transform>();
+}
+
+bool InputSystem::is_mouse_inside_button(const SDLContext::EventData & event_data,
+										 const Button & button, const Transform & transform) {
+	return event_data.mouse_position.first >= transform.position.x
+		   && event_data.mouse_position.first <= transform.position.x + button.width
+		   && event_data.mouse_position.second >= transform.position.y
+		   && event_data.mouse_position.second <= transform.position.y + button.height;
+}
+
+void InputSystem::handle_button_press(Button & button) {
+	if (button.is_toggle) {
+		if (!button.is_pressed && button.on_click) {
+			button.on_click();
+		}
+		button.is_pressed = !button.is_pressed;
+	} else if (button.on_click) {
+		button.on_click();
+	}
+}