QSqlRelationalDelegate Class

The QSqlRelationalDelegate class provides a delegate that is used to display and edit data from a QSqlRelationalTableModel. More...

Header: #include <QSqlRelationalDelegate>
qmake: QT += sql
Inherits: QItemDelegate

Public Functions

QSqlRelationalDelegate(QObject *parent = nullptr)
virtual ~QSqlRelationalDelegate()

Reimplemented Public Functions

virtual QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const override
virtual void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const override

Detailed Description

Unlike the default delegate, QSqlRelationalDelegate provides a combobox for fields that are foreign keys into other tables. To use the class, simply call QAbstractItemView::setItemDelegate() on the view with an instance of QSqlRelationalDelegate:

     std::unique_ptr<QTableView> view{new QTableView};
     view->setItemDelegate(new QSqlRelationalDelegate(view.get()));

The Relational Table Model example (shown below) illustrates how to use QSqlRelationalDelegate in conjunction with QSqlRelationalTableModel to provide tables with foreign key support.

See also QSqlRelationalTableModel and Model/View Programming.

Member Function Documentation

QSqlRelationalDelegate::QSqlRelationalDelegate(QObject *parent = nullptr)

Constructs a QSqlRelationalDelegate object with the given parent.

[virtual] QSqlRelationalDelegate::~QSqlRelationalDelegate()

Destroys the QSqlRelationalDelegate object and frees any allocated resources.

[override virtual] QWidget *QSqlRelationalDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const

Reimplements: QItemDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const.

[override virtual] void QSqlRelationalDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const

Reimplements: QItemDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const.