1 /*

     2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:    

    15 *

    16 */

    17 

    18 #ifndef HGSPRING_H

    19 #define HGSPRING_H

    20 

    21 #include <qpoint>

    22 #include <qobject>

    23 #include <qtime>

    24 

    25 class QTimer;

    26 

    27 /**

    28  * Spring physics class.

    29  */

    30 class HgSpring : public QObject

    31 {

    32     Q_OBJECT

    33 public:

    34 

    35     explicit HgSpring();    

    36     virtual ~HgSpring();

    37     

    38     void setK(qreal K);

    39     void setDamping(qreal damping);

    40     

    41     void animateToPos(const QPointF& pos);

    42     void gotoPos(const QPointF& pos);

    43     void cancel();

    44     bool isActive() const;

    45 

    46     const QPointF& startPos() const;

    47     const QPointF& pos() const;

    48     const QPointF& endPos() const;    

    49     const QPointF& velocity() const;

    50     

    51     bool updatePositionIfNeeded();

    52     

    53 signals:

    54     void updated();

    55     void started();

    56     void ended();

    57 private slots:

    58     void update();

    59 private:

    60     Q_DISABLE_COPY(HgSpring)

    61 

    62     QPointF mStartPos;

    63     QPointF mPos;

    64     QPointF mEndPos;

    65     QPointF mVelocity;

    66     qreal mK;

    67     qreal mDamping;

    68     int mAccumulator;

    69     QTimer* mTimer;

    70     QTime mPrevTime;

    71     bool mDoNotUpdate;

    72 };

    73 

    74 #endif