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/****************************************************************************
**
** 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;
}
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