CopperSpice API  1.8.2
QItemEditorCreatorBase Class Referenceabstract

Provides an abstract base class which must be subclassed when implementing new item editor creators. More...

Inheritance diagram for QItemEditorCreatorBase:
QItemEditorCreator< T > QStandardItemEditorCreator< T >

Public Methods

virtual ~QItemEditorCreatorBase ()
virtual QWidgetcreateWidget (QWidget *parent) const = 0
virtual QString valuePropertyName () const = 0

Detailed Description

The QItemEditorCreatorBase class provides an abstract base class which must be subclassed when implementing new item editor creators.

QItemEditorCreatorBase objects are specialized widget factories that provide editor widgets for one particular QVariant data type. They are used by QItemEditorFactory to create editors for QItemDelegates. Creator bases must be registered with QItemEditorFactory::registerEditor().

An editor should provide a user property for the data it edits. QItemDelagates can then access the property using the CopperSpice Meta Object System to set and retrieve the editing data. Set the user property as follows.

CS_PROPERTY_READ(color, read)
CS_PROPERTY_WRITE(color, setColor)
CS_PROPERTY_USER(color, true)

If the editor does not provide a user property, it must return the name of the property from valuePropertyName(); delegates will then use the name to access the property. If a user property exists, item delegates will not call valuePropertyName().

QStandardItemEditorCreator is a convenience template class that can be used to register widgets without the need to subclass QItemEditorCreatorBase.

See also
QStandardItemEditorCreator, QItemEditorFactory, Model/View Architecture

Constructor & Destructor Documentation

QItemEditorCreatorBase::~QItemEditorCreatorBase ( )

Destroys the editor creator object.

Method Documentation

QWidget * QItemEditorCreatorBase::createWidget ( QWidget parent) const
pure virtual

Returns an editor widget with the given parent.

When implementing this function in subclasses of this class, you must construct and return new editor widgets with the parent widget specified.

Implemented in QStandardItemEditorCreator::createWidget(), QItemEditorCreator::createWidget()

QString QItemEditorCreatorBase::valuePropertyName ( ) const
pure virtual

Returns the name of the property used to get and set values in the creator's editor widgets.

When implementing this function in subclasses, you must ensure that the editor widget's property specified by this function can accept the type the creator is registered for. For example, a creator which constructs QCheckBox widgets to edit boolean values would return the checkable property name from this function, and must be registered in the item editor factory for the QVariant::Bool type.

The item delegates query the user property of widgets, and only call this function if the widget has no user property. You can override this behavior by reimplementing QAbstractItemDelegate::setModelData() and QAbstractItemDelegate::setEditorData().

See also
QMetaObject::userProperty(), QItemEditorFactory::registerEditor()

Implemented in QStandardItemEditorCreator::valuePropertyName(), QItemEditorCreator::valuePropertyName()