Home · All Classes · All Functions · Overviews

starrating.cpp Example File
itemviews/stardelegate/starrating.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation ([email protected])
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** Commercial Usage
 ** Licensees holding valid Qt Commercial licenses may use this file in
 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
 **
 ** GNU Lesser General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU Lesser
 ** General Public License version 2.1 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.LGPL included in the
 ** packaging of this file.  Please review the following information to
 ** ensure the GNU Lesser General Public License version 2.1 requirements
 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 **
 ** In addition, as a special exception, Nokia gives you certain additional
 ** rights.  These rights are described in the Nokia Qt LGPL Exception
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License version 3.0 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.GPL included in the
 ** packaging of this file.  Please review the following information to
 ** ensure the GNU General Public License version 3.0 requirements will be
 ** met: http://www.gnu.org/copyleft/gpl.html.
 **
 ** If you have questions regarding the use of this file, please contact
 ** Nokia at [email protected].
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include <QtGui>
 #include <math.h>

 #include "starrating.h"

 const int PaintingScaleFactor = 20;

 StarRating::StarRating(int starCount, int maxStarCount)
 {
     myStarCount = starCount;
     myMaxStarCount = maxStarCount;

     starPolygon << QPointF(1.0, 0.5);
     for (int i = 1; i < 5; ++i)
         starPolygon << QPointF(0.5 + 0.5 * cos(0.8 * i * 3.14),
                                0.5 + 0.5 * sin(0.8 * i * 3.14));

     diamondPolygon << QPointF(0.4, 0.5) << QPointF(0.5, 0.4)
                    << QPointF(0.6, 0.5) << QPointF(0.5, 0.6)
                    << QPointF(0.4, 0.5);
 }

 QSize StarRating::sizeHint() const
 {
     return PaintingScaleFactor * QSize(myMaxStarCount, 1);
 }

 void StarRating::paint(QPainter *painter, const QRect &rect,
                        const QPalette &palette, EditMode mode) const
 {
     painter->save();

     painter->setRenderHint(QPainter::Antialiasing, true);
     painter->setPen(Qt::NoPen);

     if (mode == Editable) {
         painter->setBrush(palette.highlight());
     } else {
         painter->setBrush(palette.foreground());
     }

     int yOffset = (rect.height() - PaintingScaleFactor) / 2;
     painter->translate(rect.x(), rect.y() + yOffset);
     painter->scale(PaintingScaleFactor, PaintingScaleFactor);

     for (int i = 0; i < myMaxStarCount; ++i) {
         if (i < myStarCount) {
             painter->drawPolygon(starPolygon, Qt::WindingFill);
         } else if (mode == Editable) {
             painter->drawPolygon(diamondPolygon, Qt::WindingFill);
         }
         painter->translate(1.0, 0.0);
     }

     painter->restore();
 }