First cut of pulling out the relevant parts of my original game to make a little framework.

src/gui/overlay_ui.hpp

@@ -0,0 +1,25 @@
+#pragma once
+#include <SFML/Graphics/RenderWindow.hpp>
+#include <SFML/Graphics/Font.hpp>
+#include <guecs/ui.hpp>
+
+namespace gui {
+  using std::string;
+
+  class OverlayUI {
+    public:
+      guecs::UI $gui;
+
+      OverlayUI();
+
+      void init();
+      void update_level();
+
+      void render(sf::RenderWindow& window);
+      void show_sprite(string region, string sprite_name);
+      void close_sprite(string region);
+      void show_text(std::string region, std::wstring content);
+      void update_text(std::string region, std::wstring content);
+      void close_text(std::string region);
+  };
+}