menu.cpp

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/***************************************************************************************************
*****           Copyright (C) 2005 John Schneiderman <JohnMS@member.fsf.org>                   *****
*****                                                                                          *****
*****           This program is free software; you can redistribute it and/or modify           *****
*****           it under the terms of the GNU General Public License as published by           *****
*****           the Free Software Foundation; either version 2 of the License, or              *****
*****           (at your option) any later version.                                            *****
*****                                                                                          *****
*****           This program is distributed in the hope that it will be useful,                *****
*****           but WITHOUT ANY WARRANTY; without even the implied warranty of                 *****
*****           MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                  *****
*****           GNU General Public License for more details.                                   *****
*****                                                                                          *****
*****           You should have received a copy of the GNU General Public License              *****
*****           along with this program; if not, write to the Free Software                    *****
*****           Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA     *****
***************************************************************************************************/
#include "menu.h"

#include <iostream>
using std::cin;
using std::cout;
using std::endl;

const string Menu::DEFAULT_MESSAGE="- - - - - - - - - - - - - - - - - - - - ";

Menu::Menu(const string &title, const string &prompt)
{
    if (system("cls") == 0)
        m_clearScreen="cls";
    else if (system("clear") == 0)
        m_clearScreen="clear";
    else
        m_clearScreen="Clear Screen not set!";
    m_title=title;
    m_feedback=DEFAULT_MESSAGE;
    m_prompt=prompt;
    m_menuChar = '*';
}

void Menu::addMenuItem(const string &menuItem)
{
    if (m_menuItems.size() > 1)
        m_menuItems[m_menuItems.size() - 1] = menuItem;
    else
        m_menuItems.push_back(menuItem);
    m_menuItems.push_back("Exit");
}

int Menu::menuItem(const string &menuItem) const
{
    for (int i=0; i < m_menuItems.size(); i++)
        if (m_menuItems[i] == menuItem)
            return i;
    return -1;
}

void Menu::setFeedback(const string &feedback)
{
    m_feedback=feedback;
}

void Menu::draw() const
{
    system(m_clearScreen.c_str());
    int length=((MAX_WIDTH - (m_title.length() + 2)) / 2);

    //Draw the Menu title
    for (int i = 0; i < length; i++)
        cout << m_menuChar;
    cout << " " << m_title << " ";
    for (int i = length + 2 + m_title.length(); i < MAX_WIDTH; i++)
        cout << m_menuChar;
    cout << endl;
    //Draw any error messages
    length=((MAX_WIDTH - (m_feedback.length() + 2)) / 2);
    for (int i = 0; i < length; i++)
        cout << m_menuChar;
    cout << " " << m_feedback << " ";
    for (int i = length + 2 + m_feedback.length(); i < MAX_WIDTH; i++)
        cout << m_menuChar;
    cout << endl;
    m_feedback=DEFAULT_MESSAGE;
    //Draw the Menu items
    for (int i = 0; i < m_menuItems.size(); i++)
    {
        //Draw starter spacers
        for (int j = 0; j < MENU_ITEM_SPACERS; j++)
            cout << m_menuChar;
        //Draw the numbers
        if (i < 10)
            cout << "  " << i << ") " << m_menuItems[i];
        else
            cout << " " << i << ") " << m_menuItems[i];
        //Draw space to the ending spacer for all options under 100
        for (int j = 0; j < (MAX_WIDTH -((MENU_ITEM_SPACERS * 2) + 5 + m_menuItems[i].size())); j++)
            cout << " ";
        //Draw ending spacers
        for (int j = 0; j < MENU_ITEM_SPACERS; j++)
            cout << m_menuChar;
        cout << endl;
    }
    for (int i = 0; i < MAX_WIDTH; i++)
        cout << m_menuChar;
    cout << endl;
}

int Menu::selectMenuItem() const
{
    int menuItemSelection=-1;

    while (true)
    {
        cout << m_prompt;
        cin >> menuItemSelection;
        if (menuItemSelection == (m_menuItems.size() - 1))
            return MENU_EXIT;
        else if ((menuItemSelection >= 0) && (menuItemSelection < m_menuItems.size()))
            return menuItemSelection;
        else
        {
            m_feedback = "Invalid selection.";
            draw();
        }
    }
}

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