Tutorial-Menu/menu.cpp

#include <algorithm>
#include <iostream>

#include "menu.h"

const char CMenu::STR_DEFAULT_TITLE[] = "Please, choose:";
const char CMenu::STR_DEFAULT_DIVIDER[] = " - ";
const char CMenu::STR_DEFAULT_PREFIX[] = "";

bool CMenu::addItem(const menuMapValue &_item)
{
    if (m_MenuMap.find(_item.first) != m_MenuMap.end())
    {
        return false;
    }

    m_MenuMap.insert(_item);
    return true;
}

bool CMenu::addItem(const menuMapKey _key, const menuMapItem &_item)
{
    return addItem(std::make_pair(_key, _item));
}

bool CMenu::addItem(const menuMapKey _key, const std::string _title, const menuFuncPtr _item)
{
    return addItem(_key, MenuItem(_title, _item));
}

void CMenu::draw() const
{
    std::cout << std::endl << m_Title << std::endl;

    // for_each with lambda-function
    // need capture (this) to access class members (m_Prefix, m_Divider)
    for_each(m_MenuMap.cbegin(), m_MenuMap.cend(), [this](const menuMapValue& _item)
        {
            std::cout << m_Prefix <<_item.first << m_Divider << _item.second.title << std::endl;
        }
    );

    std::cout << std::endl;
}

int  CMenu::selectItem() const
{
    char cKey;
    menuMapCIt it;

    do
    {
        std::cin >> cKey;
        it = m_MenuMap.find(cKey);
    }
    while (it == m_MenuMap.cend());

    if (it->second.item != nullptr)
    {
        return (*it->second.item)();
    }

    return -1;
}