/****************************************************************************
**
** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the QtSql module of the Qt Toolkit.
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file.  Please review the following information
** to ensure GNU General Public Licensing requirements will be met:
** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
** http://www.gnu.org/copyleft/gpl.html.  In addition, as a special
** exception, Nokia gives you certain additional rights. These rights
** are described in the Nokia Qt GPL Exception version 1.3, included in
** the file GPL_EXCEPTION.txt in this package.
**
** Qt for Windows(R) Licensees
** As a special exception, Nokia, as the sole copyright holder for Qt
** Designer, grants users of the Qt/Eclipse Integration plug-in the
** right for the Qt/Eclipse Integration to link to functionality
** provided by Qt Designer and its related libraries.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
**
****************************************************************************/

#ifndef QSQLRELATIONALDELEGATE_H
#define QSQLRELATIONALDELEGATE_H

#ifdef QT_GUI_LIB

#include <QtGui/qitemdelegate.h>
#include <QtGui/qlistview.h>
#include <QtGui/qcombobox.h>
#include <QtSql/qsqlrelationaltablemodel.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Sql)

class QSqlRelationalDelegate: public QItemDelegate
{
public:

explicit QSqlRelationalDelegate(QObject *parent = 0)
    : QItemDelegate(parent)
{}

~QSqlRelationalDelegate()
{}

QWidget *createEditor(QWidget *parent,
                      const QStyleOptionViewItem &option,
                      const QModelIndex &index) const
{
    const QSqlRelationalTableModel *sqlModel = qobject_cast<const QSqlRelationalTableModel *>(index.model());
    QSqlTableModel *childModel = sqlModel ? sqlModel->relationModel(index.column()) : 0;
    if (!childModel)
        return QItemDelegate::createEditor(parent, option, index);

    QComboBox *combo = new QComboBox(parent);
    combo->setModel(childModel);
    combo->setModelColumn(childModel->fieldIndex(sqlModel->relation(index.column()).displayColumn()));
    combo->installEventFilter(const_cast<QSqlRelationalDelegate *>(this));

    return combo;
}

void setEditorData(QWidget *editor, const QModelIndex &index) const
{
    const QSqlRelationalTableModel *sqlModel = qobject_cast<const QSqlRelationalTableModel *>(index.model());
    QComboBox *combo = qobject_cast<QComboBox *>(editor);
    if (!sqlModel || !combo) {
        QItemDelegate::setEditorData(editor, index);
        return;
    }
    combo->setCurrentIndex(combo->findText(sqlModel->data(index).toString()));
}

void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
{
    if (!index.isValid())
        return;

    QSqlRelationalTableModel *sqlModel = qobject_cast<QSqlRelationalTableModel *>(model);
    QSqlTableModel *childModel = sqlModel ? sqlModel->relationModel(index.column()) : 0;
    QComboBox *combo = qobject_cast<QComboBox *>(editor);
    if (!sqlModel || !childModel || !combo) {
        QItemDelegate::setModelData(editor, model, index);
        return;
    }

    int currentItem = combo->currentIndex();
    int childColIndex = childModel->fieldIndex(sqlModel->relation(index.column()).displayColumn());
    int childEditIndex = childModel->fieldIndex(sqlModel->relation(index.column()).indexColumn());
    sqlModel->setData(index,
            childModel->data(childModel->index(currentItem, childColIndex), Qt::DisplayRole),
            Qt::DisplayRole);
    sqlModel->setData(index,
            childModel->data(childModel->index(currentItem, childEditIndex), Qt::EditRole),
            Qt::EditRole);
}

};

QT_END_NAMESPACE

QT_END_HEADER

#endif // QT_GUI_LIB

#endif // QSQLRELATIONALDELEGATE_H
