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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"

    PixelDelegate::PixelDelegate(QObject *parent)
        : QAbstractItemDelegate(parent)
    {
        pixelSize = 12;
    }

    void PixelDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                              const QModelIndex &index) const
    {
        painter->setRenderHint(QPainter::Antialiasing);
        painter->setPen(Qt::NoPen);

        if (option.state & QStyle::State_Selected)
            painter->setBrush(option.palette.highlight());
        else
            painter->setBrush(QBrush(Qt::white));

        painter->drawRect(option.rect);

        if (option.state & QStyle::State_Selected)
            painter->setBrush(option.palette.highlightedText());
        else
            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->drawEllipse(QRectF(option.rect.x() + option.rect.width()/2 - radius,
                                    option.rect.y() + option.rect.height()/2 - radius,
                                    2*radius, 2*radius));
    }

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

    void PixelDelegate::setPixelSize(int size)
    {
        pixelSize = size;
    }