Draw and event position relative to parent (for pages)

include/gui/Page.hpp

@@ -1,27 +1,19 @@
 #pragma once
 
+#include "Widget.hpp"
 #include <vector>
 #include <memory>
 
-namespace mgl {
-    class Event;
-    class Window;
-}
-
 namespace gsr {
-    class Widget;
-
-    class Page {
+    class Page : public Widget {
     public:
         Page() = default;
         Page(const Page&) = delete;
         Page& operator=(const Page&) = delete;
+        virtual ~Page() = default;
 
         void add_widget(std::unique_ptr<Widget> widget);
-
-        void on_event(mgl::Event &event, mgl::Window &window);
-        void draw(mgl::Window &window);
-    private:
+    protected:
         std::vector<std::unique_ptr<Widget>> widgets;
     };
 }