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**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtSql module of the Qt Toolkit.
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** Alternatively, this file may be used under the terms of the GNU Lesser
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****************************************************************************/
#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 *aParent = 0)
: QItemDelegate(aParent)
{}
~QSqlRelationalDelegate()
{}
QWidget *createEditor(QWidget *aParent,
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(aParent, option, index);
QComboBox *combo = new QComboBox(aParent);
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
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