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;
}