theme_book.hpp

// Copyright Take Vos 2020.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "theme_mode.hpp"
#include "theme.hpp"
#include <limits>
#include <vector>
#include <new>
 
 
namespace tt {
 
class theme_book {
public:
    ~theme_book();
    theme_book(theme_book const &) = delete;
    theme_book(theme_book &&) = delete;
    theme_book &operator=(theme_book const &) = delete;
    theme_book &operator=(theme_book &&) = delete;
 
    theme_book(std::vector<URL> const &theme_directories) noexcept;
 
    [[nodiscard]] std::vector<std::string> theme_names() const noexcept;
 
    [[nodiscard]] tt::theme_mode current_theme_mode() const noexcept;
 
    void set_current_theme_mode(tt::theme_mode theme_mode) noexcept;
 
    [[nodiscard]] std::string current_theme_name() const noexcept;
 
    void set_current_theme_name(std::string const &themeName) noexcept;
 
    static theme_book &global() noexcept
    {
        return *start_subsystem_or_terminate(_global, nullptr, subsystem_init, subsystem_deinit);
    }
 
private:
    static inline std::atomic<theme_book *>_global = nullptr;
 
    std::vector<std::unique_ptr<theme>> themes;
    std::string _current_theme_name;
    tt::theme_mode _current_theme_mode;
 
    static inline char const *_default_theme_name = "TTauri";
 
    [[nodiscard]] static theme_book *subsystem_init() noexcept;
    static void subsystem_deinit() noexcept;
 
    void update_theme() noexcept;
};
 
}