animation.h Example File

 /****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation ([email protected])
 **
 ** This file is part of the QtCore module of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #ifndef ANIMATION_H
 #define ANIMATION_H

 #include <QtGui>

 #include <QtCore/qpropertyanimation.h>

 class Animation : public QPropertyAnimation {
 public:
     enum PathType {
         LinearPath,
         CirclePath,
         NPathTypes
     };
     Animation(QObject *target, const QByteArray &prop)
         : QPropertyAnimation(target, prop)
     {
         setPathType(LinearPath);
     }

     void setPathType(PathType pathType)
     {
         if (pathType >= NPathTypes)
             qWarning("Unknown pathType %d", pathType);

         m_pathType = pathType;
         m_path = QPainterPath();
     }

     void updateCurrentTime(int currentTime)
     {
         if (m_pathType == CirclePath) {
             if (m_path.isEmpty()) {
                 QPointF to = endValue().toPointF();
                 QPointF from = startValue().toPointF();
                 m_path.moveTo(from);
                 m_path.addEllipse(QRectF(from, to));
             }
             int dura = duration();
             const qreal progress = ((dura == 0) ? 1 : ((((currentTime - 1) % dura) + 1) / qreal(dura)));

             qreal easedProgress = easingCurve().valueForProgress(progress);
             if (easedProgress > 1.0) {
                 easedProgress -= 1.0;
             } else if (easedProgress < 0) {
                 easedProgress += 1.0;
             }
             QPointF pt = m_path.pointAtPercent(easedProgress);
             updateCurrentValue(pt);
             emit valueChanged(pt);
         } else {
             QPropertyAnimation::updateCurrentTime(currentTime);
         }
     }

     QPainterPath m_path;
     PathType m_pathType;
 };

 #endif // ANIMATION_H