popup_manager.h

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#pragma once
 
#include <concepts>
#include <memory>
#include <utility>
#include <vector>
 
namespace osc { class Popup; }
 
namespace osc
{
    // generic storage for a drawable popup stack
    class PopupManager final {
    public:
        PopupManager();
        PopupManager(const PopupManager&) = delete;
        PopupManager(PopupManager&&) noexcept;
        PopupManager& operator=(const PopupManager&) = delete;
        PopupManager& operator=(PopupManager&&) noexcept;
        ~PopupManager() noexcept;
 
        void push_back(std::shared_ptr<Popup> ptr)
        {
            popups_.push_back(std::move(ptr));
        }
 
        template<std::derived_from<Popup> T, typename... Args>
        requires std::constructible_from<T, Args&&...>
        T& emplace_back(Args&&... args)
        {
            auto ptr = std::make_shared<T>(std::forward<Args>(args)...);
            T& ref = *ptr;
            popups_.push_back(std::move(ptr));
            return ref;
        }
 
        void on_mount() { open_all(); }
        void open_all();
        void on_draw();
        [[nodiscard]] bool empty();
        void clear();
    private:
        std::vector<std::shared_ptr<Popup>> popups_;
    };
}