bookdelegate.cpp Example File
^{demos/books/bookdelegate.cpp}

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    ** This file is part of the documentation of the Qt Toolkit.
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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;
    }