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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights.  These rights are described in the Nokia Qt LGPL
** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

/*
    model.cpp

    Provides a table model for use in various examples.
*/

#include <QtGui>

#include "model.h"

/*!
    Constructs a table model with at least one row and one column.
*/

TableModel::TableModel(int rows, int columns, QObject *parent)
    : QAbstractTableModel(parent)
{
    QStringList newList;

    for (int column = 0; column < qMax(1, columns); ++column) {
        newList.append("");
    }

    for (int row = 0; row < qMax(1, rows); ++row) {
        rowList.append(newList);
    }
}


/*!
    Returns the number of items in the row list as the number of rows
    in the model.
*/

int TableModel::rowCount(const QModelIndex &/*parent*/) const
{
    return rowList.size();
}

/*!
    Returns the number of items in the first list item as the number of
    columns in the model. All rows should have the same number of columns.
*/

int TableModel::columnCount(const QModelIndex &/*parent*/) const
{
    return rowList[0].size();
}

/*!
    Returns an appropriate value for the requested data.
    If the view requests an invalid index, an invalid variant is returned.
    Any valid index that corresponds to a string in the list causes that
    string to be returned for the display role; otherwise an invalid variant
    is returned.
*/

QVariant TableModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid())
        return QVariant();

    if (role == Qt::DisplayRole)
        return rowList[index.row()][index.column()];
    else
        return QVariant();
}

/*!
    Returns the appropriate header string depending on the orientation of
    the header and the section. If anything other than the display role is
    requested, we return an invalid variant.
*/

QVariant TableModel::headerData(int section, Qt::Orientation orientation,
                                int role) const
{
    if (role != Qt::DisplayRole)
        return QVariant();

    if (orientation == Qt::Horizontal)
        return QString("Column %1").arg(section);
    else
        return QString("Row %1").arg(section);
}

/*!
    Returns an appropriate value for the item's flags. Valid items are
    enabled, selectable, and editable.
*/

Qt::ItemFlags TableModel::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return Qt::ItemIsEnabled;

    return Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsEditable;
}

/*!
    Changes an item in the model, but only if the following conditions
    are met:

    * The index supplied is valid.
    * The role associated with editing text is specified.

    The dataChanged() signal is emitted if the item is changed.
*/

bool TableModel::setData(const QModelIndex &index,
                         const QVariant &value, int role)
{
    if (!index.isValid() || role != Qt::EditRole)
        return false;

    rowList[index.row()][index.column()] = value.toString();
    emit dataChanged(index, index);
    return true;
}

/*!
    Inserts a number of rows into the model at the specified position.
*/

bool TableModel::insertRows(int position, int rows, const QModelIndex &parent)
{
    int columns = columnCount();
    beginInsertRows(parent, position, position + rows - 1);

    for (int row = 0; row < rows; ++row) {
        QStringList items;
        for (int column = 0; column < columns; ++column)
            items.append("");
        rowList.insert(position, items);
    }

    endInsertRows();
    return true;
}

/*!
    Inserts a number of columns into the model at the specified position.
    Each entry in the list is extended in turn with the required number of
    empty strings.
*/

bool TableModel::insertColumns(int position, int columns, const QModelIndex &parent)
{
    int rows = rowCount();
    beginInsertColumns(parent, position, position + columns - 1);

    for (int row = 0; row < rows; ++row) {
        for (int column = position; column < columns; ++column) {
            rowList[row].insert(position, "");
        }
    }

    endInsertColumns();
    return true;
}

/*!
    Removes a number of rows from the model at the specified position.
*/

bool TableModel::removeRows(int position, int rows, const QModelIndex &parent)
{
    beginRemoveRows(parent, position, position + rows - 1);

    for (int row = 0; row < rows; ++row) {
        rowList.removeAt(position);
    }

    endRemoveRows();
    return true;
}

/*!
    Removes a number of columns from the model at the specified position.
    Each row is shortened by the number of columns specified.
*/

bool TableModel::removeColumns(int position, int columns, const QModelIndex &parent)
{
    int rows = rowCount();
    beginRemoveColumns(parent, position, position + columns - 1);

    for (int row = 0; row < rows; ++row) {
        for (int column = 0; column < columns; ++column) {
            rowList[row].removeAt(position);
        }
    }

    endRemoveColumns();
    return true;
}