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# bookdelegate.cpp Example File
demos/books/bookdelegate.cpp

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        ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
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        ** 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
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        #include "bookdelegate.h"

        #include <QtGui>

        BookDelegate::BookDelegate(QObject *parent)
            : QSqlRelationalDelegate(parent), star(QPixmap(":images/star.png"))
        {
        }

        void BookDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                                   const QModelIndex &index) const
        {
            if (index.column() != 5) {
                QStyleOptionViewItem opt = option;
                opt.rect.adjust(0, 0, -1, -1); // since we draw the grid ourselves
                QSqlRelationalDelegate::paint(painter, opt, index);
            } else {
                const QAbstractItemModel *model = index.model();
                QPalette::ColorGroup cg = option.state & QStyle::State_Enabled
                                          ? QPalette::Normal : QPalette::Disabled;
                if (option.state & QStyle::State_Selected)
                    painter->fillRect(option.rect, option.palette.color(cg, QPalette::Highlight));

                int rating = model->data(index, Qt::DisplayRole).toInt();
                int width = star.width();
                int height = star.height();
                int x = option.rect.x();
                int y = option.rect.y() + (option.rect.height() / 2) - (height / 2);
                for (int i = 0; i < rating; ++i) {
                    painter->drawPixmap(x, y, star);
                    x += width;
                }
                drawFocus(painter, option, option.rect.adjusted(0, 0, -1, -1)); // since we draw the grid ourselves
            }

            QPen pen = painter->pen();
            painter->setPen(option.palette.color(QPalette::Mid));
            painter->drawLine(option.rect.bottomLeft(), option.rect.bottomRight());
            painter->drawLine(option.rect.topRight(), option.rect.bottomRight());
            painter->setPen(pen);
        }

        QSize BookDelegate::sizeHint(const QStyleOptionViewItem &option,
                                         const QModelIndex &index) const
        {
            if (index.column() == 5)
                return QSize(5 * star.width(), star.height()) + QSize(1, 1);

            return QSqlRelationalDelegate::sizeHint(option, index) + QSize(1, 1); // since we draw the grid ourselves
        }

        bool BookDelegate::editorEvent(QEvent *event, QAbstractItemModel *model,
                                       const QStyleOptionViewItem &option,
                                       const QModelIndex &index)
        {
            if (index.column() != 5)
                return QSqlRelationalDelegate::editorEvent(event, model, option, index);

            QMouseEvent *mouseEvent;
            int stars;

            switch (event->type()) {
                case QEvent::MouseButtonPress:
                    mouseEvent = static_cast<QMouseEvent*>(event);
                    stars = qBound(0, int(0.7 + qreal(mouseEvent->pos().x()
                                      - option.rect.x()) / star.width()), 5);
                    model->setData(index, QVariant(stars));
                    break;
                default:
                    break;
            }

            return true;
        }