qitemeditorfactory.cpp

奇趣公司比较新的qt/emd版本

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#include <qplatformdefs.h>
#include "qitemeditorfactory.h"

#ifndef QT_NO_ITEMVIEWS

#include <qcombobox.h>
#include <qdatetimeedit.h>
#include <qlabel.h>
#include <qlineedit.h>
#include <qspinbox.h>
#include <limits.h>
#include <float.h>
#include <qcoreapplication.h>
#include <qdebug.h>


#ifndef QT_NO_LINEEDIT

class QExpandingLineEdit : public QLineEdit
{
    Q_OBJECT

public:
    QExpandingLineEdit(QWidget *parent);
    QExpandingLineEdit(const QString &contents, QWidget *parent);

public Q_SLOTS:
    void resizeToContents();

private:
    int originalWidth;
};

#endif // QT_NO_LINEEDIT

#ifndef QT_NO_COMBOBOX

class QBooleanComboBox : public QComboBox
{
    Q_OBJECT
    Q_PROPERTY(bool value READ value WRITE setValue USER true)

public:
    QBooleanComboBox(QWidget *parent);
    void setValue(bool);
    bool value() const;
};

#endif // QT_NO_COMBOBOX

/*!
    \class QItemEditorFactory
    \brief The QItemEditorFactory class provides widgets for editing item data
    in views and delegates.
    \since 4.2
    \ingroup model-view

    When editing data in an item view, editors are created and
    displayed by a delegate. QItemDelegate, which is the delegate by
    default installed on Qt's item views, uses a QItemEditorFactory to
    create editors for it. A default unique instance provided by
    QItemEditorFactory is used by all item delegates.  If you set a
    new default factory with setDefaultFactory(), the new factory will
    be used by existing and new delegates.

    A factory keeps a collection of QItemEditorCreatorBase
    instances, which are specialized editors that produce editors
    for one particular QVariant data type (All Qt models store
    their data in \l{QVariant}s).

    \section1 Standard Editing Widgets

    The standard factory implementation provides editors for a variety of data
    types. These are created whenever a delegate needs to provide an editor for
    data supplied by a model. The following table shows the relationship between
    types and the standard editors provided.

    \table
    \header \o Type \o Editor Widget
    \row    \o bool \o QComboBox
    \row    \o double \o QDoubleSpinBox
    \row    \o int \o{1,2} QSpinBox
    \row    \o unsigned int
    \row    \o QDate \o QDateEdit
    \row    \o QDateTime \o QDateTimeEdit
    \row    \o QPixmap \o QLabel
    \row    \o QString \o QLineEdit
    \row    \o QTime \o QTimeEdit
    \endtable

    Additional editors can be registered with the registerEditor() function. 

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

/*!
    \fn QItemEditorFactory::QItemEditorFactory()

    Constructs a new item editor factory.
*/

/*!
    Creates an editor widget with the given \a parent for the specified \a type of data,
    and returns it as a QWidget.

    \sa registerEditor()
*/
QWidget *QItemEditorFactory::createEditor(QVariant::Type type, QWidget *parent) const
{
    QItemEditorCreatorBase *creator = creatorMap.value(type, 0);
    if (!creator) {
        const QItemEditorFactory *dfactory = defaultFactory();
        return dfactory == this ? 0 : dfactory->createEditor(type, parent);
    }
    return creator->createWidget(parent);
}

/*!
    Returns the property name used to access data for the given \a type of data.
*/
QByteArray QItemEditorFactory::valuePropertyName(QVariant::Type type) const
{
    QItemEditorCreatorBase *creator = creatorMap.value(type, 0);
    if (!creator) {
        const QItemEditorFactory *dfactory = defaultFactory();
        return dfactory == this ? QByteArray() : dfactory->valuePropertyName(type);
    }
    return creator->valuePropertyName();
}

/*!
    Destroys the item editor factory.
*/
QItemEditorFactory::~QItemEditorFactory()
{
}

/*!
    Registers an item editor creator specified by \a creator for the given \a type of data.

    \bold{Note:} The factory takes ownership of the item editor creator and will destroy
    it if a new creator for the same type is registered later.

    \sa createEditor()
*/
void QItemEditorFactory::registerEditor(QVariant::Type type, QItemEditorCreatorBase *creator)
{
   delete creatorMap.value(type, 0);
   creatorMap[type] = creator;
}

class QDefaultItemEditorFactory : public QItemEditorFactory
{
public:
    inline QDefaultItemEditorFactory() {}
    QWidget *createEditor(QVariant::Type type, QWidget *parent) const;
    QByteArray valuePropertyName(QVariant::Type) const;
};

QWidget *QDefaultItemEditorFactory::createEditor(QVariant::Type type, QWidget *parent) const
{
    switch (type) {
#ifndef QT_NO_COMBOBOX
    case QVariant::Bool: {
        QBooleanComboBox *cb = new QBooleanComboBox(parent);
        cb->setFrame(false);
        return cb; }
#endif
#ifndef QT_NO_SPINBOX
    case QVariant::UInt: {
        QSpinBox *sb = new QSpinBox(parent);
        sb->setFrame(false);
        sb->setMaximum(INT_MAX);
        return sb; }
    case QVariant::Int: {
        QSpinBox *sb = new QSpinBox(parent);
        sb->setFrame(false);
        sb->setMinimum(INT_MIN);
        sb->setMaximum(INT_MAX);
        return sb; }
#endif
#ifndef QT_NO_DATETIMEEDIT
    case QVariant::Date: {
        QDateTimeEdit *ed = new QDateEdit(parent);
        ed->setFrame(false);
        return ed; }
    case QVariant::Time: {
        QDateTimeEdit *ed = new QTimeEdit(parent);
        ed->setFrame(false);
        return ed; }
    case QVariant::DateTime: {
        QDateTimeEdit *ed = new QDateTimeEdit(parent);
        ed->setFrame(false);
        return ed; }
#endif
    case QVariant::Pixmap:
        return new QLabel(parent);
#ifndef QT_NO_SPINBOX
    case QVariant::Double: {
        QDoubleSpinBox *sb = new QDoubleSpinBox(parent);
        sb->setFrame(false);
        sb->setMinimum(-DBL_MAX);
        sb->setMaximum(DBL_MAX);
        return sb; }
#endif
#ifndef QT_NO_LINEEDIT
    case QVariant::String:
    default: {
        // the default editor is a lineedit
        QLineEdit *le = new QExpandingLineEdit(parent);
        le->setFrame(false);
        return le; }
#else
    default:
        break;
#endif
    }
    return 0;
}

QByteArray QDefaultItemEditorFactory::valuePropertyName(QVariant::Type type) const
{
    switch (type) {
#ifndef QT_NO_COMBOBOX
    case QVariant::Bool:
        return "currentIndex";
#endif
#ifndef QT_NO_SPINBOX
    case QVariant::UInt:
    case QVariant::Int:
    case QVariant::Double:
        return "value";
#endif
#ifndef QT_NO_DATETIMEEDIT
    case QVariant::Date:
        return "date";
    case QVariant::Time:
        return "time";
    case QVariant::DateTime:
        return "dateTime";
#endif
    case QVariant::String:
    default:
        // the default editor is a lineedit