/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the documentation of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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/*+
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  model.cpp+
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+
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  A simple model that uses a QStringList as its data source.+
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*/+
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+
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#include <qdebug.h>+
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+
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#include "model.h"+
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+
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/*!+
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    Returns the number of items in the string list as the number of rows+
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    in the model.+
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*/+
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+
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int StringListModel::rowCount(const QModelIndex &parent) const+
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{+
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    return stringList.count();+
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}+
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+
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/*!+
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    Returns an appropriate value for the requested data.+
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    If the view requests an invalid index, an invalid variant is returned.+
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    If a header is requested then we just return the column or row number,+
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    depending on the orientation of the header.+
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    Any valid index that corresponds to a string in the list causes that+
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    string to be returned.+
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*/+
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+
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QVariant StringListModel::data(const QModelIndex &index, int role) const+
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{+
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    if (!index.isValid())+
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        return QVariant();+
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+
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    if (index.row() < 0 || index.row() >= stringList.size())+
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        return QVariant();+
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+
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    if (role == Qt::DisplayRole)+
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        return stringList.at(index.row());+
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    else+
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        return QVariant();+
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}+
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+
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/*!+
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    Returns the appropriate header string depending on the orientation of+
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    the header and the section. If anything other than the display role is+
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    requested, we return an invalid variant.+
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*/+
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+
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QVariant StringListModel::headerData(int section, Qt::Orientation orientation,+
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                                     int role) const+
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{+
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    if (role != Qt::DisplayRole)+
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        return QVariant();+
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+
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    if (orientation == Qt::Horizontal)+
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        return QString("Column %1").arg(section);+
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    else+
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        return QString("Row %1").arg(section);+
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}+
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+
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/*!+
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    Returns an appropriate value for the item's flags. Valid items are+
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    enabled, selectable, and editable.+
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*/+
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+
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Qt::ItemFlags StringListModel::flags(const QModelIndex &index) const+
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{+
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    if (!index.isValid())+
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        return Qt::ItemIsEnabled;+
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+
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    return QAbstractItemModel::flags(index) | Qt::ItemIsEditable;+
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}+
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+
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/*!+
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    Changes an item in the string list, but only if the following conditions+
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    are met:+
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+
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    * The index supplied is valid.+
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    * The index corresponds to an item to be shown in a view.+
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    * The role associated with editing text is specified.+
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+
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    The dataChanged() signal is emitted if the item is changed.+
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*/+
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+
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bool StringListModel::setData(const QModelIndex &index,+
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                              const QVariant &value, int role)+
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{+
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    if (index.isValid() && role == Qt::EditRole) {+
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+
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        stringList.replace(index.row(), value.toString());+
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        emit dataChanged(index, index);+
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        return true;+
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    }+
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    return false;+
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}+
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+
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/*!+
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    Inserts a number of rows into the model at the specified position.+
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*/+
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+
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bool StringListModel::insertRows(int position, int rows, const QModelIndex &parent)+
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{+
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    beginInsertRows(parent, position, position + rows - 1);+
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+
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    for (int row = 0; row < rows; ++row) {+
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        stringList.insert(position, "");+
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    }+
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+
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    endInsertRows();+
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    return true;+
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}+
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+
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/*!+
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    Removes a number of rows from the model at the specified position.+
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*/+
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+
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bool StringListModel::removeRows(int position, int rows, const QModelIndex &parent)+
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{+
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    beginRemoveRows(parent, position, position + rows - 1);+
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+
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    for (int row = 0; row < rows; ++row) {+
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        stringList.removeAt(position);+
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    }+
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+
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    endRemoveRows();+
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    return true;+
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}+
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