imageitem.cpp Example File
sql/drilldown/imageitem.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** 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 qt-info@nokia.com.
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "imageitem.h"

 ImageItem::ImageItem(int id, const QPixmap &pixmap, QGraphicsItem *parent,
                      QGraphicsScene *scene)
     : QGraphicsPixmapItem(pixmap, parent, scene)
 {
     recordId = id;
     setAcceptsHoverEvents(true);

     timeLine.setDuration(150);
     timeLine.setFrameRange(0, 150);

     connect(&timeLine, SIGNAL(frameChanged(int)), this, SLOT(setFrame(int)));
     connect(&timeLine, SIGNAL(finished()), this, SLOT(updateItemPosition()));

     adjust();
 }

 void ImageItem::hoverEnterEvent(QGraphicsSceneHoverEvent * /*event*/)
 {
     timeLine.setDirection(QTimeLine::Forward);

     if (z != 1.0) {
         z = 1.0;
         updateItemPosition();
     }

     if (timeLine.state() == QTimeLine::NotRunning)
         timeLine.start();
 }

 void ImageItem::hoverLeaveEvent(QGraphicsSceneHoverEvent * /*event*/)
 {
     timeLine.setDirection(QTimeLine::Backward);
     if (z != 0.0)
         z = 0.0;

     if (timeLine.state() == QTimeLine::NotRunning)
         timeLine.start();
 }

 void ImageItem::setFrame(int frame)
 {
     adjust();
     QPointF center = boundingRect().center();

     translate(center.x(), center.y());
     scale(1 + frame / 330.0, 1 + frame / 330.0);
     translate(-center.x(), -center.y());
 }

 void ImageItem::adjust()
 {
     QMatrix matrix;
     matrix.scale(150/ boundingRect().width(), 120/ boundingRect().height());
     setMatrix(matrix);
 }

 int ImageItem::id()
 {
     return recordId;
 }

 void ImageItem::updateItemPosition()
 {
     setZValue(z);
 }