/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** 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

  A simple model that uses a QVector as its data source.

*/

#include "model.h"

/*!

    Returns the number of items in the string list as the number of rows

    in the model.

*/

int LinearModel::rowCount(const QModelIndex &parent) const

{

    Q_USING(parent);

    return values.count();

}

/*

    Returns an appropriate value for the requested data.

    If the view requests an invalid index, an invalid variant is returned.

    If a header is requested then we just return the column or row number,

    depending on the orientation of the header.

    Any valid index that corresponds to a string in the list causes that

    string to be returned.

*/

/*!

    Returns a model index for other component to use when referencing the

    item specified by the given row, column, and type. The parent index

    is ignored.

*/

QModelIndex LinearModel::index(int row, int column, const QModelIndex &parent) const

{

    if (parent == QModelIndex() && row >= 0 && row < rowCount()

        && column == 0)

        return createIndex(row, column, 0);

    else

        return QModelIndex();

}

QVariant LinearModel::data(const QModelIndex &index, int role) const

{

    Q_UNUSED(role);

    if (!index.isValid())

        return QVariant();

    return values.at(index.row());

}

/*!

    Returns Qt::ItemIsEditable so that all items in the vector can be edited.

*/

Qt::ItemFlags LinearModel::flags(const QModelIndex &index) const

{

    // all items in the model are editable

    return QAbstractListModel::flags(index) | Qt::ItemIsEditable;

}

/*!

    Changes an item in the string list, but only if the following conditions

    are met:

    * The index supplied is valid.

    * The index corresponds to an item to be shown in a view.

    * The role associated with editing text is specified.

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

*/

bool LinearModel::setData(const QModelIndex &index,

                          const QVariant &value, int role)

{

    if (!index.isValid() || role != Qt::EditRole)

        return false;

    values.replace(index.row(), value.toInt());

    emit dataChanged(index, index);

    return true;

}

/*!

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

*/

bool LinearModel::insertRows(int position, int rows, const QModelIndex &parent)

{

    beginInsertRows(parent, position, position + rows - 1);

    values.insert(position, rows, 0);

    endInsertRows();

    return true;

}

/*!

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

*/

bool LinearModel::removeRows(int position, int rows, const QModelIndex &parent)

{

    beginRemoveRows(QModelIndex(), position, position+rows-1);

    values.remove(position, rows);

    endRemoveRows();

    return true;

}