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# variantdelegate.cpp Example File
tools/settingseditor/variantdelegate.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2005-2006 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 as published by the Free Software Foundation
        ** and appearing in the file LICENSE.GPL included in the packaging of
        ** this file.  Please review the following information to ensure GNU
        ** General Public Licensing requirements will be met:
        ** http://www.trolltech.com/products/qt/opensource.html
        **
        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
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        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/

        #include <QtGui>

        #include "variantdelegate.h"

        VariantDelegate::VariantDelegate(QObject *parent)
            : QItemDelegate(parent)
        {
            boolExp.setPattern("true|false");
            boolExp.setCaseSensitivity(Qt::CaseInsensitive);

            byteArrayExp.setPattern("[\\x00-\\xff]*");
            charExp.setPattern(".");
            colorExp.setPattern("\\(([0-9]*),([0-9]*),([0-9]*),([0-9]*)\\)");
            doubleExp.setPattern("");
            pointExp.setPattern("\\((-?[0-9]*),(-?[0-9]*)\\)");
            rectExp.setPattern("\\((-?[0-9]*),(-?[0-9]*),(-?[0-9]*),(-?[0-9]*)\\)");
            signedIntegerExp.setPattern("-?[0-9]*");
            sizeExp = pointExp;
            unsignedIntegerExp.setPattern("[0-9]*");

            dateExp.setPattern("([0-9]{,4})-([0-9]{,2})-([0-9]{,2})");
            timeExp.setPattern("([0-9]{,2}):([0-9]{,2}):([0-9]{,2})");
            dateTimeExp.setPattern(dateExp.pattern() + "T" + timeExp.pattern());
        }

        void VariantDelegate::paint(QPainter *painter,
                                    const QStyleOptionViewItem &option,
                                    const QModelIndex &index) const
        {
            if (index.column() == 2) {
                QVariant value = index.model()->data(index, Qt::UserRole);
                if (!isSupportedType(value.type())) {
                    QStyleOptionViewItem myOption = option;
                    myOption.state &= ~QStyle::State_Enabled;
                    QItemDelegate::paint(painter, myOption, index);
                    return;
                }
            }

            QItemDelegate::paint(painter, option, index);
        }

        QWidget *VariantDelegate::createEditor(QWidget *parent,
                const QStyleOptionViewItem & /* option */,
                const QModelIndex &index) const
        {
            if (index.column() != 2)
                return 0;

            QVariant originalValue = index.model()->data(index, Qt::UserRole);
            if (!isSupportedType(originalValue.type()))
                return 0;

            QLineEdit *lineEdit = new QLineEdit(parent);
            lineEdit->setFrame(false);

            QRegExp regExp;

            switch (originalValue.type()) {
            case QVariant::Bool:
                regExp = boolExp;
                break;
            case QVariant::ByteArray:
                regExp = byteArrayExp;
                break;
            case QVariant::Char:
                regExp = charExp;
                break;
            case QVariant::Color:
                regExp = colorExp;
                break;
            case QVariant::Date:
                regExp = dateExp;
                break;
            case QVariant::DateTime:
                regExp = dateTimeExp;
                break;
            case QVariant::Double:
                regExp = doubleExp;
                break;
            case QVariant::Int:
            case QVariant::LongLong:
                regExp = signedIntegerExp;
                break;
            case QVariant::Point:
                regExp = pointExp;
                break;
            case QVariant::Rect:
                regExp = rectExp;
                break;
            case QVariant::Size:
                regExp = sizeExp;
                break;
            case QVariant::Time:
                regExp = timeExp;
                break;
            case QVariant::UInt:
            case QVariant::ULongLong:
                regExp = unsignedIntegerExp;
                break;
            default:
                ;
            }

            if (!regExp.isEmpty()) {
                QValidator *validator = new QRegExpValidator(regExp, lineEdit);
                lineEdit->setValidator(validator);
            }

            connect(lineEdit, SIGNAL(returnPressed()),
                    this, SLOT(commitAndCloseEditor()));

            return lineEdit;
        }

        void VariantDelegate::setEditorData(QWidget *editor,
                                            const QModelIndex &index) const
        {
            QVariant value = index.model()->data(index, Qt::UserRole);
            if (QLineEdit *lineEdit = qobject_cast<QLineEdit *>(editor))
                lineEdit->setText(displayText(value));
        }

        void VariantDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
                                           const QModelIndex &index) const
        {
            QLineEdit *lineEdit = qobject_cast<QLineEdit *>(editor);
            if (!lineEdit->isModified())
                return;

            QString text = lineEdit->text();
            const QValidator *validator = lineEdit->validator();
            if (validator) {
                int pos;
                if (validator->validate(text, pos) != QValidator::Acceptable)
                    return;
            }

            QVariant originalValue = index.model()->data(index, Qt::UserRole);
            QVariant value;

            switch (originalValue.type()) {
            case QVariant::Char:
                value = text.at(0);
                break;
            case QVariant::Color:
                colorExp.exactMatch(text);
                value = QColor(qMin(colorExp.cap(1).toInt(), 255),
                               qMin(colorExp.cap(2).toInt(), 255),
                               qMin(colorExp.cap(3).toInt(), 255),
                               qMin(colorExp.cap(4).toInt(), 255));
                break;
            case QVariant::Date:
                {
                    QDate date = QDate::fromString(text, Qt::ISODate);
                    if (!date.isValid())
                        return;
                    value = date;
                }
                break;
            case QVariant::DateTime:
                {
                    QDateTime dateTime = QDateTime::fromString(text, Qt::ISODate);
                    if (!dateTime.isValid())
                        return;
                    value = dateTime;
                }
                break;
            case QVariant::Point:
                pointExp.exactMatch(text);
                value = QPoint(pointExp.cap(1).toInt(), pointExp.cap(2).toInt());
                break;
            case QVariant::Rect:
                rectExp.exactMatch(text);
                value = QRect(rectExp.cap(1).toInt(), rectExp.cap(2).toInt(),
                              rectExp.cap(3).toInt(), rectExp.cap(4).toInt());
                break;
            case QVariant::Size:
                sizeExp.exactMatch(text);
                value = QSize(sizeExp.cap(1).toInt(), sizeExp.cap(2).toInt());
                break;
            case QVariant::StringList:
                value = text.split(",");
                break;
            case QVariant::Time:
                {
                    QTime time = QTime::fromString(text, Qt::ISODate);
                    if (!time.isValid())
                        return;
                    value = time;
                }
                break;
            default:
                value = text;
                value.convert(originalValue.type());
            }

            model->setData(index, displayText(value), Qt::DisplayRole);
            model->setData(index, value, Qt::UserRole);
        }

        bool VariantDelegate::isSupportedType(QVariant::Type type)
        {
            switch (type) {
            case QVariant::Bool:
            case QVariant::ByteArray:
            case QVariant::Char:
            case QVariant::Color:
            case QVariant::Date:
            case QVariant::DateTime:
            case QVariant::Double:
            case QVariant::Int:
            case QVariant::LongLong:
            case QVariant::Point:
            case QVariant::Rect:
            case QVariant::Size:
            case QVariant::String:
            case QVariant::StringList:
            case QVariant::Time:
            case QVariant::UInt:
            case QVariant::ULongLong:
                return true;
            default:
                return false;
            }
        }

        QString VariantDelegate::displayText(const QVariant &value)
        {
            switch (value.type()) {
            case QVariant::Bool:
            case QVariant::ByteArray:
            case QVariant::Char:
            case QVariant::Double:
            case QVariant::Int:
            case QVariant::LongLong:
            case QVariant::String:
            case QVariant::UInt:
            case QVariant::ULongLong:
                return value.toString();
            case QVariant::Color:
                {
                    QColor color = qvariant_cast<QColor>(value);
                    return QString("(%1,%2,%3,%4)")
                           .arg(color.red()).arg(color.green())
                           .arg(color.blue()).arg(color.alpha());
                }
            case QVariant::Date:
                return value.toDate().toString(Qt::ISODate);
            case QVariant::DateTime:
                return value.toDateTime().toString(Qt::ISODate);
            case QVariant::Invalid:
                return "<Invalid>";
            case QVariant::Point:
                {
                    QPoint point = value.toPoint();
                    return QString("(%1,%2)").arg(point.x()).arg(point.y());
                }
            case QVariant::Rect:
                {
                    QRect rect = value.toRect();
                    return QString("(%1,%2,%3,%4)")
                           .arg(rect.x()).arg(rect.y())
                           .arg(rect.width()).arg(rect.height());
                }
            case QVariant::Size:
                {
                    QSize size = value.toSize();
                    return QString("(%1,%2)").arg(size.width()).arg(size.height());
                }
            case QVariant::StringList:
                return value.toStringList().join(",");
            case QVariant::Time:
                return value.toTime().toString(Qt::ISODate);
            }
            return QString("<%1>").arg(value.typeName());
        }

        void VariantDelegate::commitAndCloseEditor()
        {
            QWidget *editor = qobject_cast<QWidget *>(sender());
            emit commitData(editor);
            emit closeEditor(editor);
        }