- Main Page
- Related Pages
- Modules
- Namespaces
- Classes
- Files
- Directories
- Examples

- File List
- File Members

# qsqlrelationaldelegate.h

Go to the documentation of this file.

    00001 /****************************************************************************
    00002 **
    00003 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
    00004 ** All rights reserved.
    00005 ** Contact: Nokia Corporation (qt-info@nokia.com)
    00006 **
    00007 ** This file is part of the QtSql module of the Qt Toolkit.
    00008 **
    00009 ** $QT_BEGIN_LICENSE:LGPL$
    00010 ** Commercial Usage
    00011 ** Licensees holding valid Qt Commercial licenses may use this file in
    00012 ** accordance with the Qt Commercial License Agreement provided with the
    00013 ** Software or, alternatively, in accordance with the terms contained in
    00014 ** a written agreement between you and Nokia.
    00015 **
    00016 ** GNU Lesser General Public License Usage
    00017 ** Alternatively, this file may be used under the terms of the GNU Lesser
    00018 ** General Public License version 2.1 as published by the Free Software
    00019 ** Foundation and appearing in the file LICENSE.LGPL included in the
    00020 ** packaging of this file.  Please review the following information to
    00021 ** ensure the GNU Lesser General Public License version 2.1 requirements
    00022 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    00023 **
    00024 ** In addition, as a special exception, Nokia gives you certain additional
    00025 ** rights.  These rights are described in the Nokia Qt LGPL Exception
    00026 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this module.
    00027 **
    00028 ** GNU General Public License Usage
    00029 ** Alternatively, this file may be used under the terms of the GNU
    00030 ** General Public License version 3.0 as published by the Free Software
    00031 ** Foundation and appearing in the file LICENSE.GPL included in the
    00032 ** packaging of this file.  Please review the following information to
    00033 ** ensure the GNU General Public License version 3.0 requirements will be
    00034 ** met: http://www.gnu.org/copyleft/gpl.html.
    00035 **
    00036 ** If you have questions regarding the use of this file, please contact
    00037 ** Nokia at qt-info@nokia.com.
    00038 ** $QT_END_LICENSE$
    00039 **
    00040 ****************************************************************************/
    00041
    00042 #ifndef QSQLRELATIONALDELEGATE_H
    00043 #define QSQLRELATIONALDELEGATE_H
    00044
    00045 #ifdef QT_GUI_LIB
    00046
    00047 #include <QtGui/qitemdelegate.h>
    00048 #include <QtGui/qlistview.h>
    00049 #include <QtGui/qcombobox.h>
    00050 #include <QtSql/qsqlrelationaltablemodel.h>
    00051
    00052 QT_BEGIN_HEADER
    00053
    00054 QT_BEGIN_NAMESPACE
    00055
    00056 QT_MODULE(Sql)
    00057
    00058 class QSqlRelationalDelegate: public QItemDelegate
    00059 {
    00060 public:
    00061
    00062 explicit QSqlRelationalDelegate(QObject *parent = 0)
    00063     : QItemDelegate(parent)
    00064 {}
    00065
    00066 ~QSqlRelationalDelegate()
    00067 {}
    00068
    00069 QWidget *createEditor(QWidget *parent,
    00070                       const QStyleOptionViewItem &option,
    00071                       const QModelIndex &index) const
    00072 {
    00073     const QSqlRelationalTableModel *sqlModel = qobject_cast<const QSqlRelationalTableModel *>(index.model());
    00074     QSqlTableModel *childModel = sqlModel ? sqlModel->relationModel(index.column()) : 0;
    00075     if (!childModel)
    00076         return QItemDelegate::createEditor(parent, option, index);
    00077
    00078     QComboBox *combo = new QComboBox(parent);
    00079     combo->setModel(childModel);
    00080     combo->setModelColumn(childModel->fieldIndex(sqlModel->relation(index.column()).displayColumn()));
    00081     combo->installEventFilter(const_cast<QSqlRelationalDelegate *>(this));
    00082
    00083     return combo;
    00084 }
    00085
    00086 void setEditorData(QWidget *editor, const QModelIndex &index) const
    00087 {
    00088     const QSqlRelationalTableModel *sqlModel = qobject_cast<const QSqlRelationalTableModel *>(index.model());
    00089     QComboBox *combo = qobject_cast<QComboBox *>(editor);
    00090     if (!sqlModel || !combo) {
    00091         QItemDelegate::setEditorData(editor, index);
    00092         return;
    00093     }
    00094     combo->setCurrentIndex(combo->findText(sqlModel->data(index).toString()));
    00095 }
    00096
    00097 void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
    00098 {
    00099     if (!index.isValid())
    00100         return;
    00101
    00102     QSqlRelationalTableModel *sqlModel = qobject_cast<QSqlRelationalTableModel *>(model);
    00103     QSqlTableModel *childModel = sqlModel ? sqlModel->relationModel(index.column()) : 0;
    00104     QComboBox *combo = qobject_cast<QComboBox *>(editor);
    00105     if (!sqlModel || !childModel || !combo) {
    00106         QItemDelegate::setModelData(editor, model, index);
    00107         return;
    00108     }
    00109
    00110     int currentItem = combo->currentIndex();
    00111     int childColIndex = childModel->fieldIndex(sqlModel->relation(index.column()).displayColumn());
    00112     int childEditIndex = childModel->fieldIndex(sqlModel->relation(index.column()).indexColumn());
    00113     sqlModel->setData(index,
    00114             childModel->data(childModel->index(currentItem, childColIndex), Qt::DisplayRole),
    00115             Qt::DisplayRole);
    00116     sqlModel->setData(index,
    00117             childModel->data(childModel->index(currentItem, childEditIndex), Qt::EditRole),
    00118             Qt::EditRole);
    00119 }
    00120
    00121 };
    00122
    00123 QT_END_NAMESPACE
    00124
    00125 QT_END_HEADER
    00126
    00127 #endif // QT_GUI_LIB
    00128
    00129 #endif // QSQLRELATIONALDELEGATE_H