feat(ui): add button enable/disable and reset on re-enter

Prevent double-clicking on buttons that push new scenes by disabling them on click and re-enabling when the UI manager's on_re_enter is called.

include/Cubed/ui/button.hpp

@@ -31,7 +31,7 @@ public:
     Button& set_text(const std::string& text);
 
     Button& set_auto_scale(bool auto_scale);
-
+    Button& set_enable(bool enable);
     float scale() const;
     template <typename F> Button& set_clicked(F&& f) {
         m_clicked = std::forward<F>(f);
@@ -49,6 +49,7 @@ private:
     std::unique_ptr<Image> m_background;
     std::unique_ptr<Label> m_foreground;
     bool m_hovered = false;
+    bool m_enable = true;
     float m_width = NORMAL_BUTTON_WIDTH;
     float m_height = NORMAL_BUTTON_HEIGHT;
     float m_scale = DEFAULT_SCALE;

include/Cubed/ui/main_menu_ui_manager.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "Cubed/ui/button.hpp"
 #include "Cubed/ui/ui_manager.hpp"
 
 namespace Cubed {
@@ -15,8 +16,10 @@ public:
     ~MainMenuUIManager();
 
     void init() override;
+    void on_re_enter();
 
 private:
     MainMenuScene& m_scene;
+    std::vector<Button*> m_pending_enable;
 };
 } // namespace Cubed

include/Cubed/ui/pasue_menu_ui_manager.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "Cubed/ui/button.hpp"
 #include "Cubed/ui/ui_manager.hpp"
 namespace Cubed {
 class WorldScene;
@@ -11,8 +12,10 @@ public:
     PauseMenuUIManager& operator=(PauseMenuUIManager&&) = delete;
     PauseMenuUIManager(WorldScene& scene);
     void init() override;
+    void on_re_enter();
 
 private:
     WorldScene& m_scene;
+    std::vector<Button*> m_pending_enable;
 };
 } // namespace Cubed