source: tspsg-svn/trunk/src/tspmodel.cpp @ 19

/*
 *  TSPSG - TSP Solver and Generator
 *  Copyright (C) 2007-2009 Lёppa <contacts[at]oleksii[dot]name>
 *
 *  $Id: tspmodel.cpp 19 2009-06-16 07:19:51Z laleppa $
 *  $URL: https://tspsg.svn.sourceforge.net/svnroot/tspsg/trunk/src/tspmodel.cpp $
 *
 *  This file is part of TSPSG.
 *
 *  TSPSG 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  TSPSG 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 TSPSG.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <QtGui>
#include "tspmodel.h"

CTSPModel::CTSPModel(QObject *parent)
        : QAbstractTableModel(parent), randMin(1), randMax(10), nCities(0)
{
}

int CTSPModel::rand(int min, int max)
{
        return min + (int)(((float)qrand() / RAND_MAX) * max);
}

int CTSPModel::rowCount(const QModelIndex &) const
{
        return nCities;
}

int CTSPModel::columnCount(const QModelIndex &) const
{
        return nCities;
}

QVariant CTSPModel::headerData(int section, Qt::Orientation orientation, int role) const
{
        if (role == Qt::DisplayRole)
                if (orientation == Qt::Vertical)
                        return trUtf8("Город %1").arg(section + 1);
                else
                        return trUtf8("%1").arg(section + 1);
        return QVariant();
}

QVariant CTSPModel::data(const QModelIndex &index, int role) const
{
        if (!index.isValid())
                return QVariant();
        if (role == Qt::TextAlignmentRole)
                return int(Qt::AlignCenter);
        else if (role == Qt::FontRole) {
QFont font;
                font.setBold(true);
                return font;
        } else if (role == Qt::DisplayRole || role == Qt::EditRole) {
                if (index.row() < nCities && index.column() < nCities)
                        if (table[index.row()][index.column()] == INFINITY)
                                return trUtf8(INFSTR);
                        else
                                // HACK: Converting to string to prevent spinbox in edit mode
                                return QVariant(table[index.row()][index.column()]).toString();
                else
                        return QVariant();
        } else if (role == Qt::UserRole)
                return table[index.row()][index.column()];
        return QVariant();
}

bool CTSPModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
        if (!index.isValid())
                return false;
        if (role == Qt::EditRole && index.row() != index.column()) {
                if (value.toString().compare(INFSTR) == 0)
                        table[index.row()][index.column()] = INFINITY;
                else {
bool ok;
double tmp = value.toDouble(&ok);
                        if (!ok || tmp < 0)
                                return false;
                        else
                                table[index.row()][index.column()] = tmp;
                }
                emit dataChanged(index,index);
                return true;
        }
        return false;
}

Qt::ItemFlags CTSPModel::flags(const QModelIndex &index) const
{
Qt::ItemFlags flags = QAbstractItemModel::flags(index);
        if (index.row() != index.column())
                flags |= Qt::ItemIsEditable;
        return flags;
}

int CTSPModel::numCities() const
{
        return nCities;
}

void CTSPModel::setNumCities(int n)
{
        if (n == nCities)
                return;
        emit layoutAboutToBeChanged();
        if (n > nCities) {
                for (int r = 0; r < nCities; r++) {
                        for (int c = nCities; c < n; c++)
                                if (r == c)
                                        table[r][c] = INFINITY;
                                else
                                        table[r][c] = rand(randMin,randMax);
                }
                for (int r = nCities; r < n; r++) {
                        for (int c = 0; c < n; c++)
                                if (r == c)
                                        table[r][c] = INFINITY;
                                else
                                        table[r][c] = rand(randMin,randMax);
                }
        }
        nCities = n;
        emit layoutChanged();
}

void CTSPModel::randomize()
{
        for (int r = 0; r < nCities; r++)
                for (int c = 0; c < nCities; c++)
                        if (r != c)
                                table[r][c] = rand(randMin,randMax);
        emit dataChanged(index(0,0),index(nCities - 1,nCities - 1));
}