pixeldelegate.cpp Example File
^{itemviews/pixelator/pixeldelegate.cpp}

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    ** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
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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);
    }