restructure project for dynamic linking

modules/gui/layers/layer.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include "engine.h"
+
+#include "event.h"
+
+class Layer {
+
+    friend class EventHandler;
+
+    public:
+
+        Layer();
+        virtual ~Layer();
+
+        virtual void onAttach() = 0;
+        virtual void onDetach() = 0;
+        virtual void onUpdate() = 0;
+        virtual bool onEvent(const Event* event) = 0;
+
+    protected:
+        virtual bool onMouseButtonPressed(const MouseButtonEvent* event) = 0;
+        virtual bool onMouseButtonReleased(const MouseButtonEvent* event) = 0;
+        virtual bool onMouseMoved(const MouseMovedEvent* event) = 0;
+        virtual bool onMouseScrolled(const MouseScrolledEvent* event) = 0;
+        virtual bool onKeyPressed(const KeyEvent* event) = 0;
+        virtual bool onKeyReleased(const KeyEvent* event) = 0;
+        virtual bool onKeyTyped(const KeyTypedEvent* event) = 0;
+        virtual bool onWindowResize(const WindowEvent* event) = 0;
+        virtual bool onWindowFocus(const WindowEvent* event) = 0;
+        virtual bool onWindowFocusLost(const WindowEvent* event) = 0;
+        virtual bool onWindowClose(const WindowEvent* event) = 0;
+        virtual bool onWindowMoved(const WindowEvent* event) = 0;
+
+};