menu_model.h

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#pragma once
 
// standard includes
#include <cstddef>
#include <limits>
#include <string>
#include <string_view>
#include <vector>
 
// local includes
#include "src/input/navigation_input.h"
 
namespace ui {
 
  struct MenuItem {
    std::string id;  
    std::string label;  
    std::string description;  
    bool enabled;  
  };
 
  struct MenuUpdate {
    bool selectionChanged;  
    bool activationRequested;  
    bool backRequested;  
    bool previousPageRequested;  
    bool nextPageRequested;  
    bool overlayToggleRequested;  
    std::string activatedItemId;  
  };
 
  class MenuModel {
  public:
    static constexpr std::size_t npos = std::numeric_limits<std::size_t>::max();
 
    explicit MenuModel(std::vector<MenuItem> items = {});
 
    void set_items(std::vector<MenuItem> items);
 
    [[nodiscard]] const std::vector<MenuItem> &items() const;
 
    [[nodiscard]] std::size_t selected_index() const;
 
    [[nodiscard]] const MenuItem *selected_item() const;
 
    bool select_item_by_id(std::string_view itemId);
 
    MenuUpdate handle_command(input::UiCommand command);
 
  private:
    bool move_selection(int direction);
    [[nodiscard]] std::size_t find_first_enabled_index() const;
 
    std::vector<MenuItem> items_;
    std::size_t selectedIndex_ = npos;
  };
 
}  // namespace ui