MenuOutput.hpp

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/*
 * This file is part of the DUDS project. It is subject to the BSD-style
 * license terms in the LICENSE file found in the top-level directory of this
 * distribution and at https://github.com/jjackowski/duds/blob/master/LICENSE.
 * No part of DUDS, including this file, may be copied, modified, propagated,
 * or distributed except according to the terms contained in the LICENSE file.
 *
 * Copyright (C) 2019  Jeff Jackowski
 */
#ifndef MENUOUTPUT_HPP
#define MENUOUTPUT_HPP

#include <duds/ui/menu/Menu.hpp>
#include <duds/ui/menu/MenuView.hpp>

namespace duds { namespace ui { namespace menu {

class MenuOutputAccess;

typedef std::list<MenuItem*>  MenuVisibleList;

class MenuOutput {
private:
    std::shared_ptr<MenuView> mview;
    MenuVisibleList items;
    MenuVisibleList::const_iterator seliter;
    std::size_t selectedVis;
    std::size_t firstIdx;
    std::size_t lastIdx;
    std::size_t range = 1;
    std::size_t selected = 0;
    int updateIdx = -1;
    bool vchg;
    bool showFirst;
    bool showLast;
    void lock(std::size_t newRange);
    void unlock();
    void maxVisible(std::size_t newRange);
    bool fore(Menu::ItemVec::const_iterator &iter);
    bool revr(Menu::ItemVec::const_iterator &iter);
    void updateVisible();
    bool changed() const {
        return vchg;
    }
    friend MenuOutputAccess;
public:
    MenuOutput() = default;
    MenuOutput(const std::shared_ptr<MenuView> &view, int vis);
    static std::shared_ptr<MenuOutput> make(
        const std::shared_ptr<MenuView> &view,
        int vis
    ) {
        return std::make_shared<MenuOutput>(view, vis);
    }
    void attach(const std::shared_ptr<MenuView> &view, int vis = 0);
    const std::shared_ptr<MenuView> &view() const {
        return mview;
    }
    const std::shared_ptr<Menu> &menu() const;
};

typedef std::shared_ptr<MenuOutput>  MenuOutputSptr;

typedef std::weak_ptr<MenuOutput>  MenuOutputWptr;

} } }

#endif        //  #ifndef MENUOUTPUT_HPP