Qt 4.0: pixeldelegate.cpp Example File (itemviews/pixelator/pixeldelegate.cpp)

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# pixeldelegate.cpp Example File
itemviews/pixelator/pixeldelegate.cpp

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        ** This file is part of the documentation of the Qt Toolkit.
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        #include <QtGui>

        #include "pixeldelegate.h"

        void PixelDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                                  const QModelIndex &index) const
        {
            painter->setRenderHint(QPainter::Antialiasing);
            painter->setBrush(QBrush(Qt::white));
            painter->setPen(Qt::NoPen);
            painter->drawRect(option.rect);
            painter->setBrush(QBrush(Qt::black));

            int size = qMin(option.rect.width(), option.rect.height());
            int brightness = index.model()->data(index, Qt::DisplayRole).toInt();
            double radius = (size/2.0) - (brightness/255.0 * size/2.0);

            painter->save();
            painter->translate(option.rect.x() + option.rect.width()/2 - radius,
                               option.rect.y() + option.rect.height()/2 - radius);
            painter->drawEllipse(QRectF(0.0, 0.0, 2*radius, 2*radius));
            painter->restore();
        }

        QSize PixelDelegate::sizeHint(const QStyleOptionViewItem & /* option */,
                                      const QModelIndex & /* index */) const
        {
            return QSize(PixelSize, PixelSize);
        }