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/****************************************************************************
**
** Copyright (C) 2022 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtSql module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
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**
**
******************************************************************************/
#ifndef QSQLRELATIONALDELEGATE_H
#define QSQLRELATIONALDELEGATE_H
#include <QtSql/qtsqlglobal.h>
QT_REQUIRE_CONFIG(sqlmodel);
#ifdef QT_WIDGETS_LIB
#include <QtWidgets/qstyleditemdelegate.h>
#if QT_CONFIG(listview)
#include <QtWidgets/qlistview.h>
#endif
#if QT_CONFIG(combobox)
#include <QtWidgets/qcombobox.h>
#endif
#include <QtSql/qsqldriver.h>
#include <QtSql/qsqlrelationaltablemodel.h>
#include <QtCore/qmetaobject.h>
QT_BEGIN_NAMESPACE
class QSqlRelationalDelegate : public QStyledItemDelegate
{
static int fieldIndex(const QSqlTableModel *const model,
const QSqlDriver *const driver,
const QString &fieldName)
{
const QString stripped = driver->isIdentifierEscaped(fieldName, QSqlDriver::FieldName)
? driver->stripDelimiters(fieldName, QSqlDriver::FieldName)
: fieldName;
return model->fieldIndex(stripped);
}
public:
explicit QSqlRelationalDelegate(QObject *aParent = nullptr)
: QStyledItemDelegate(aParent)
{}
~QSqlRelationalDelegate()
{}
QWidget *createEditor(QWidget *aParent,
const QStyleOptionViewItem &option,
const QModelIndex &index) const override
{
const QSqlRelationalTableModel *sqlModel = qobject_cast<const QSqlRelationalTableModel *>(index.model());
QSqlTableModel *childModel = sqlModel ? sqlModel->relationModel(index.column()) : nullptr;
if (!childModel)
return QStyledItemDelegate::createEditor(aParent, option, index);
const QSqlDriver *const driver = childModel->database().driver();
QComboBox *combo = new QComboBox(aParent);
combo->setModel(childModel);
combo->setModelColumn(fieldIndex(childModel, driver,
sqlModel->relation(index.column()).displayColumn()));
combo->installEventFilter(const_cast<QSqlRelationalDelegate *>(this));
return combo;
}
void setEditorData(QWidget *editor, const QModelIndex &index) const override
{
if (!index.isValid())
return;
if (qobject_cast<QComboBox *>(editor)) {
// Taken from QItemDelegate::setEditorData() as we need
// to present the DisplayRole and not the EditRole which
// is the id reference to the related model
QVariant v = index.data(Qt::DisplayRole);
const QByteArray n = editor->metaObject()->userProperty().name();
if (!n.isEmpty()) {
if (!v.isValid())
v = QVariant(editor->property(n.data()).metaType());
editor->setProperty(n.data(), v);
return;
}
}
QStyledItemDelegate::setEditorData(editor, index);
}
void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const override
{
if (!index.isValid())
return;
QSqlRelationalTableModel *sqlModel = qobject_cast<QSqlRelationalTableModel *>(model);
QSqlTableModel *childModel = sqlModel ? sqlModel->relationModel(index.column()) : nullptr;
QComboBox *combo = qobject_cast<QComboBox *>(editor);
if (!sqlModel || !childModel || !combo) {
QStyledItemDelegate::setModelData(editor, model, index);
return;
}
const QSqlDriver *const driver = childModel->database().driver();
int currentItem = combo->currentIndex();
int childColIndex = fieldIndex(childModel, driver,
sqlModel->relation(index.column()).displayColumn());
int childEditIndex = fieldIndex(childModel, driver,
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
#endif // QT_WIDGETS_LIB
#endif // QSQLRELATIONALDELEGATE_H
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