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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.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
** $QT_END_LICENSE$
**
****************************************************************************/
/*
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;
}
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