/******************************************************************************** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.**** This file is part of the QtSql module of the Qt Toolkit.**** This file may be used under the terms of the GNU General Public** License version 2.0 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.trolltech.com/products/qt/opensource.html**** If you are unsure which license is appropriate for your use, please** review the following information:** http://www.trolltech.com/products/qt/licensing.html or contact the** sales department at sales@trolltech.com.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.******************************************************************************/#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_HEADERQT_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_HEADER#endif // QT_GUI_LIB#endif // QSQLRELATIONALDELEGATE_H