QStyledItemDelegate Class

成员函数

QStyledItemDelegate::QStyledItemDelegate(QObject *parent = nullptr)

Constructs an item delegate with the given parent.

[virtual] QStyledItemDelegate::~QStyledItemDelegate()

Destroys the item delegate.

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

重新实现: QAbstractItemDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const.

Returns the widget used to edit the item specified by index for editing. The parent widget and style option are used to control how the editor widget appears.

另见 QAbstractItemDelegate::createEditor().

[virtual] QString QStyledItemDelegate::displayText(const QVariant &value, const QLocale &locale) const

This function returns the string that the delegate will use to display the Qt::DisplayRole of the model in locale. value is the value of the Qt::DisplayRole provided by the model.

The default implementation uses the QLocale::toString to convert value into a QString.

This function is not called for empty model indices, i.e., indices for which the model returns an invalid QVariant.

另见 QAbstractItemModel::data().

[override virtual protected] bool QStyledItemDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index)

重新实现: QAbstractItemDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index).

[override virtual protected] bool QStyledItemDelegate::eventFilter(QObject *editor, QEvent *event)

重新实现: QObject::eventFilter(QObject *watched, QEvent *event).

Returns true if the given editor is a valid QWidget and the given event is handled; otherwise returns false. The following key press events are handled by default:

• Tab
• Backtab
• Enter
• Return
• Esc

If the editor's type is QTextEdit or QPlainTextEdit then Enter and Return keys are not handled.

In the case of Tab, Backtab, Enter and Return key press events, the editor's data is committed to the model and the editor is closed. If the event is a Tab key press the view will open an editor on the next item in the view. Likewise, if the event is a Backtab key press the view will open an editor on the previous item in the view.

If the event is a Esc key press event, the editor is closed without committing its data.

另见 commitData() and closeEditor().

[virtual protected] void QStyledItemDelegate::initStyleOption(QStyleOptionViewItem *option, const QModelIndex &index) const

Initialize option with the values using the index index. This method is useful for subclasses when they need a QStyleOptionViewItem, but don't want to fill in all the information themselves.

另见 QStyleOption::initFrom().

QItemEditorFactory *QStyledItemDelegate::itemEditorFactory() const

Returns the editor factory used by the item delegate. If no editor factory is set, the function will return null.

另见 setItemEditorFactory().

[override virtual] void QStyledItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const

重新实现: QAbstractItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const.

Renders the delegate using the given painter and style option for the item specified by index.

This function paints the item using the view's QStyle.

When reimplementing paint in a subclass. Use the initStyleOption() to set up the option in the same way as the QStyledItemDelegate.

Whenever possible, use the option while painting. Especially its rect variable to decide where to draw and its state to determine if it is enabled or selected.

After painting, you should ensure that the painter is returned to the state it was supplied in when this function was called. For example, it may be useful to call QPainter::save() before painting and QPainter::restore() afterwards.

另见 QItemDelegate::paint(), QStyle::drawControl(), and QStyle::CE_ItemViewItem.

[override virtual] void QStyledItemDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const

重新实现: QAbstractItemDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const.

Sets the data to be displayed and edited by the editor from the data model item specified by the model index.

The default implementation stores the data in the editor widget's user property.

另见 QMetaProperty::isUser().

void QStyledItemDelegate::setItemEditorFactory(QItemEditorFactory *factory)

Sets the editor factory to be used by the item delegate to be the factory specified. If no editor factory is set, the item delegate will use the default editor factory.

另见 itemEditorFactory().

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

重新实现: QAbstractItemDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const.

Gets data from the editor widget and stores it in the specified model at the item index.

The default implementation gets the value to be stored in the data model from the editor widget's user property.

另见 QMetaProperty::isUser().

[override virtual] QSize QStyledItemDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const

重新实现: QAbstractItemDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const.

Returns the size needed by the delegate to display the item specified by index, taking into account the style information provided by option.

This function uses the view's QStyle to determine the size of the item.

另见 QStyle::sizeFromContents() and QStyle::CT_ItemViewItem.

[override virtual] void QStyledItemDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const

重新实现: QAbstractItemDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const.

Updates the editor for the item specified by index according to the style option given.