qitemeditorfactory.cpp

奇趣公司比较新的qt/emd版本

        return "text";
    }
}

static QItemEditorFactory *q_default_factory = 0;
struct QDefaultFactoryCleaner
{
    inline QDefaultFactoryCleaner() {}
    ~QDefaultFactoryCleaner() { delete q_default_factory; q_default_factory = 0; }
};

/*!
    Returns the default item editor factory.

    \sa setDefaultFactory()
*/
const QItemEditorFactory *QItemEditorFactory::defaultFactory()
{
    static const QDefaultItemEditorFactory factory;
    if (q_default_factory)
        return q_default_factory;
    return &factory;
}

/*!
    Sets the default item editor factory to the given \a factory.
    Both new and existing delegates will use the new factory.

    \sa defaultFactory()
*/
void QItemEditorFactory::setDefaultFactory(QItemEditorFactory *factory)
{
    static const QDefaultFactoryCleaner cleaner;
    delete q_default_factory;
    q_default_factory = factory;
}

/*!
    \class QItemEditorCreatorBase
    \brief The QItemEditorCreatorBase class provides an abstract base class that
    must be subclassed when implementing new item editor creators.
    \since 4.2
    \ingroup model-view

    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
    \l{QItemDelegate}s. 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 Qt's
    \l{Meta-Object System}{meta-object system} to set and retrieve the
    editing data. A property is set as the user property with the USER
    keyword:

    \code
        Q_PROPERTY(QColor color READ color WRITE setColor USER true)
    \endcode

    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.

    \sa QStandardItemEditorCreator, QItemEditorFactory,
    {Model/View Programming}, {Color Editor Factory Example}
*/

/*!
    \fn QItemEditorCreatorBase::~QItemEditorCreatorBase()

    Destroys the editor creator object.
*/

/*!
    \fn QWidget *QItemEditorCreatorBase::createWidget(QWidget *parent) const

    Returns an editor widget with the given \a parent.

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

/*!
    \fn QByteArray QItemEditorCreatorBase::valuePropertyName() const

    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
    \l{QCheckBox::checkable}{checkable} property name from this function,
    and must be registered in the item editor factory for the QVariant::Bool
    type.

    Note: Since Qt 4.2 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().

    \sa QMetaObject::userProperty(), QItemEditorFactory::registerEditor()
*/

/*!
    \class QItemEditorCreator
    \brief The QItemEditorCreator class makes it possible to create
	   item editor creator bases without subclassing
	   QItemEditorCreatorBase.

    \since 4.2
    \ingroup model-view

    QItemEditorCreator is a convenience template class. It uses
    the template class to create editors for QItemEditorFactory.
    This way, it is not necessary to subclass
    QItemEditorCreatorBase.

    \code
    QItemEditorCreator<MyEditor> *itemCreator =
        new QItemEditorCreator<MyEditor>("myProperty");

    QItemEditorFactory *factory = new QItemEditorFactory;
    \endcode

    The constructor takes the name of the property that contains the
    editing data. QItemDelegate can then access the property by name
    when it sets and retrieves editing data. Only use this class if
    your editor does not define a user property (using the USER
    keyword in the Q_PROPERTY macro).  If the widget has a user
    property, you should use QStandardItemEditorCreator instead.

    \sa QItemEditorCreatorBase, QStandardItemEditorCreator,
	QItemEditorFactory, {Color Editor Factory Example}
*/

/*!
    \fn QItemEditorCreator::QItemEditorCreator(const QByteArray &valuePropertyName)

    Constructs an editor creator object using \a valuePropertyName
    as the name of the property to be used for editing. The
    property name is used by QItemDelegate when setting and
    getting editor data.

    Note that the \a valuePropertyName is only used if the editor
    widget does not have a user property defined.
*/

/*!
    \fn QWidget *QItemEditorCreator::createWidget(QWidget *parent) const
    \reimp
*/

/*!
    \fn QByteArray QItemEditorCreator::valuePropertyName() const
    \reimp
*/

/*!
    \class QStandardItemEditorCreator

    \brief The QStandardItemEditorCreator class provides the
    possibility to register widgets without having to subclass
    QItemEditorCreatorBase.

    \since 4.2
    \ingroup model-view

    This convenience template class makes it possible to register widgets without
    having to subclass QItemEditorCreatorBase.

    Example:

    \code
    QItemEditorFactory *editorFactory = new QItemEditorFactory;
    QItemEditorCreatorBase *creator = new QStandardItemEditorCreator<MyFancyDateTimeEdit>();
    editorFactory->registerEditor(QVariant::DateType, creator);
    \endcode

    Setting the \c editorFactory created above in an item delegate via
    QItemDelegate::setItemEditorFactory() makes sure that all values of type
    QVariant::DateTime will be edited in \c{MyFancyDateTimeEdit}.

    The editor must provide a user property that will contain the
    editing data. The property is used by \l{QItemDelegate}s to set
    and retrieve the data (using Qt's \l{Meta-Object
    System}{meta-object system}). You set the user property with
    the USER keyword:

    \code
	Q_PROPERTY(QColor color READ color WRITE setColor USER true)	
    \endcode

    \sa QItemEditorCreatorBase, QItemEditorCreator,
	QItemEditorFactory, QItemDelegate, {Color Editor Factory Example}
*/

/*!
    \fn QStandardItemEditorCreator::QStandardItemEditorCreator()

    Constructs an editor creator object.
*/

/*!
    \fn QWidget *QStandardItemEditorCreator::createWidget(QWidget *parent) const
    \reimp
*/

/*!
    \fn QByteArray QStandardItemEditorCreator::valuePropertyName() const
    \reimp
*/

#ifndef QT_NO_LINEEDIT

QExpandingLineEdit::QExpandingLineEdit(QWidget *parent)
    : QLineEdit(parent), originalWidth(-1)
{
    connect(this, SIGNAL(textChanged(QString)), this, SLOT(resizeToContents()));
}

QExpandingLineEdit::QExpandingLineEdit(const QString &contents, QWidget *parent)
    : QLineEdit(contents, parent), originalWidth(-1)
{
    connect(this, SIGNAL(textChanged(QString)), this, SLOT(resizeToContents()));
}

void QExpandingLineEdit::resizeToContents()
{
    if (originalWidth == -1)
        originalWidth = width();
    if (QWidget *parent = parentWidget()) {
        QPoint position = pos();
	QFontMetrics fm(font());
	int hintWidth = sizeHint().width() - (fm.width(QLatin1Char('x')) * 17) + fm.width(displayText());
        int parentWidth = parent->width();
	int maxWidth = isRightToLeft() ? position.x() + width() : parentWidth - position.x();
	int newWidth = qBound(originalWidth, hintWidth, maxWidth);
	if (isRightToLeft())
	    setGeometry(position.x() - newWidth + width(), position.y(), newWidth, height());
	else
	    resize(newWidth, height());
    }
}

#endif // QT_NO_LINEEDIT

#ifndef QT_NO_COMBOBOX

QBooleanComboBox::QBooleanComboBox(QWidget *parent)
    : QComboBox(parent)
{
    addItem(QComboBox::tr("False"));
    addItem(QComboBox::tr("True"));
}

void QBooleanComboBox::setValue(bool value)
{
    setCurrentIndex(value ? 1 : 0);
}

bool QBooleanComboBox::value() const
{
    return (currentIndex() == 1);
}

#endif // QT_NO_COMBOBOX

#if !defined(QT_NO_LINEEDIT) || !defined(QT_NO_COMBOBOX)
#include "qitemeditorfactory.moc"
#endif

#endif // QT_NO_ITEMVIEWS