Initial UI in src

src/UI/UI_combobox.hpp

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "UI_item.hpp"
+#include "UI_x_boxes.hpp"
+
+#define UI_COMBOBOX_TYPE std::string("UIcombobox")
+typedef void (*UI_combobox_on_change) (std::string id, int selected);
+
+class UI_combobox : public UI_x_boxes
+{
+    public:
+        UI_combobox();
+        UI_combobox(std::string id, std::string text, Color fg_color, Color bg_color, std::vector<std::string> options, int selected, UI_combobox_on_change on_change = nullptr);
+        UI_combobox(std::string id, std::string text, Color fg_color, Color bg_color, std::vector<std::string> options, UI_combobox_on_change on_change = nullptr);
+        UI_combobox(const json& j);
+
+        void set_selected(size_t selected);
+        void set_selected(std::string selected);
+        size_t selected() const;
+        std::string selected_text() const;
+    
+        void from_json(const json& j) override;
+        json to_json() const override;
+    private:
+        size_t p_selected;
+
+        UI_combobox_on_change p_on_change;
+};