feat(ui): add ScrollView widget and dynamic layout on resize

Introduces a ScrollView widget with mouse wheel support and viewport clipping.
Credits and screenshot screens now use it and recompute layout on window resize.
Offset storage switched from ivec2 to vec2 with new accessors.

include/Cubed/ui/credits_ui.hpp

@@ -9,9 +9,11 @@ class CreditsUI : public UIManager {
 public:
     CreditsUI(CreditsScene& m_scene);
     void init() override;
+    void update_layout(int width, int height);
 
 private:
     bool handle_key_event(const KeyEvent& e) override;
+    bool handle_window_resize_event(const WindowResizeEvent& e) override;
     CreditsScene& m_scene;
 };
 } // namespace Cubed

include/Cubed/ui/scroll_view.hpp

@@ -0,0 +1,35 @@
+#pragma once
+
+#include "Cubed/ui/widget.hpp"
+namespace Cubed {
+class ColumnLayout;
+class ScrollView : public Widget {
+public:
+    ScrollView(const ScrollView&) = delete;
+    ScrollView(ScrollView&&) = delete;
+    ScrollView& operator=(const ScrollView&) = delete;
+    ScrollView& operator=(ScrollView&&) = delete;
+
+    ScrollView(Widget* parent);
+    ~ScrollView();
+
+    void render(Renderer& renderer) override;
+
+    float width() const override;
+    // visable height, you need notice offset
+    float height() const override;
+
+    ScrollView& set_child(std::unique_ptr<ColumnLayout> children);
+
+    bool handle_mouse_wheel_event(const MouseWheelEvent& e) override;
+    bool handle_mouse_move_event(const MouseMoveEvent& e) override;
+    Widget& set_fill_parent(bool fill) override;
+    Widget& set_fill_width(bool fill) override;
+    Widget& set_fill_height(bool fill) override;
+
+private:
+    ColumnLayout* m_child = nullptr;
+    bool m_hovered = false;
+    float m_scroll_speed = 50.0f;
+};
+} // namespace Cubed

include/Cubed/ui/widget.hpp

@@ -32,7 +32,9 @@ public:
     virtual void update(float dt);
     virtual void render(Renderer& renderer);
     virtual Widget& set_anchor(Anchor anchor);
-    virtual Widget& set_offset(glm::ivec2 offset);
+    virtual Widget& set_offset(glm::vec2 offset);
+    virtual Widget& add_offset(glm::vec2 offset);
+    virtual glm::vec2 get_offset() const;
     static void set_window_size(int width, int height);
     virtual Widget& set_visible(bool visible);
     // Returns the final display size
@@ -78,7 +80,7 @@ protected:
     bool m_fill_width = false;
     bool m_show_border = false;
     int m_border_size = 5;
-    glm::ivec2 m_offset{0, 0};
+    glm::vec2 m_offset{0, 0};
 
     std::vector<std::unique_ptr<Widget>>& children();