QStyledItemDelegate Class Reference
[QtGui module]

QStyledItemDelegate and QItemDelegate

QStyledItemDelegate has taken over the job as default delegate - leaving QItemDelegate behind. They will now co-exist peacefully as independent alternatives to painting and providing editors for items in views. The difference between them is that the new delegate uses the current style to paint its items. We therefore recommend using QStyledItemDelegate as base when implementing custom delegates. The code required should be equal unless the custom delegate also wishes to use the style for drawing.

If you wish to customize the painting of item views, you should implement a custom style. Please see the QStyle class documentation for details.

See also Delegate Classes, QItemDelegate, QAbstractItemDelegate, QStyle, Spin Box Delegate Example, Star Delegate Example, and Color Editor Factory Example.

Member Function Documentation

QStyledItemDelegate::QStyledItemDelegate ( QObject * parent = 0 )

Constructs an item delegate with the given parent.

QStyledItemDelegate::~QStyledItemDelegate ()

Destroys the item delegate.

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

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.

Reimplemented from QAbstractItemDelegate.

See also QAbstractItemDelegate::createEditor().

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

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.

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

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

In the case of Tab, Backtab, Enter and Return key press events, the editor's data is comitted 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.

Reimplemented from QObject.

See also commitData() and closeEditor().

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

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. This function will check the version of the QStyleOptionViewItem and fill in the additional values for a QStyleOptionViewItemV2, QStyleOptionViewItemV3 and QStyleOptionViewItemV4.

See also 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.

See also setItemEditorFactory().

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

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; the option will always be an instance of QStyleOptionViewItemV4. Please see its class description for information on its contents.

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 its 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.

Reimplemented from QAbstractItemDelegate.

See also QItemDelegate::paint(), QStyle::drawControl(), and QStyle::CE_ItemViewItem.

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

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.

Reimplemented from QAbstractItemDelegate.

See also 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.

See also itemEditorFactory().

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

Gets data drom 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.

Note that the model parameter is redundant because the index knows about its model.

Reimplemented from QAbstractItemDelegate.

See also QMetaProperty::isUser().

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

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.

Reimplemented from QAbstractItemDelegate.

See also QStyle::sizeFromContents() and QStyle::CT_ItemViewItem.

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

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

Reimplemented from QAbstractItemDelegate.