Move UI folder

UI/UI_textbox.hpp

@@ -0,0 +1,26 @@
+#pragma once
+#include "UI_item.hpp"
+#include <string>
+
+#define UI_TEXTBOX_TYPE std::string("UI_textbox")
+
+class UI_textbox : public UI_item
+{
+    Q_OBJECT
+  public:
+    UI_textbox(std::string hint, Color fg_color, Color bg_color, QObject *parent = nullptr);
+    UI_textbox(const json &j, QObject *parent = nullptr);
+
+    void set_text(std::string text) override;
+
+    void set_hint(std::string hint);
+    std::string hint() const;
+
+    void from_json(const json &j) override;
+    json to_json(size_t id) const override;
+  signals:
+    void on_change(std::string text);
+
+  private:
+    std::string m_hint;
+};