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QSqlRelationalDelegate Class

QSqlRelationalDelegate 类提供了一个委托，用于显示和编辑来自QSqlRelationalTableModel... 更多...

Header： #include <QSqlRelationalDelegate>
CMake： find_package(Qt6 REQUIRED COMPONENTS Sql)
target_link_libraries(mytarget PRIVATE Qt6::Sql)
qmake： QT += sql
继承： QStyledItemDelegate

公共函数

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

重新实现的公共函数

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

详细说明

与默认委托不同，QSqlRelationalDelegate 为作为其他表外键值的字段提供了一个组合框。要使用该类，只需在视图上使用 QSqlRelationalDelegate 实例调用QAbstractItemView::setItemDelegate() 即可：

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

关系表模型示例（如下所示）说明了如何将 QSqlRelationalDelegate 与QSqlRelationalTableModel 结合使用，为表提供外键支持。

另请参阅 QSqlRelationalTableModel 和模型/视图编程。

成员函数文档

[explicit] QSqlRelationalDelegate::QSqlRelationalDelegate(QObject *parent = nullptr)

使用给定的parent 构建 QSqlRelationalDelegate 对象。

[virtual noexcept] QSqlRelationalDelegate::~QSqlRelationalDelegate()

销毁QSqlRelationalDelegate 对象并释放已分配的资源。

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

重实现：QStyledItemDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const.

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

重实现：QStyledItemDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const.

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