Home · All Classes · Main Classes · Grouped Classes · Modules · Functions

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

    /****************************************************************************
    **
    ** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
    **
    ** This file is part of the documentation of the Qt Toolkit.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
** accordance with the Qt Preview License Agreement provided with the
** Software.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
** information about Qt Commercial License Agreements.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ****************************************************************************/

    #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);
    }


Copyright © 2005 Trolltech Trademarks
Qt 4.0.1