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/****************************************************************************
**
** 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 QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QTime>
#include <QPointer>
#include <QObject>
#include <qkineticscroller.h>
#include <QEvent>
#if QT_VERSION < 0x040700
# include <QTime>
#else
# include <QElapsedTimer>
#endif
QT_BEGIN_NAMESPACE
class QKineticScrollerPrivate : public QObject
{
Q_OBJECT
Q_DECLARE_PUBLIC(QKineticScroller)
public:
QKineticScrollerPrivate();
virtual ~QKineticScrollerPrivate();
void init();
void setState(QKineticScroller::State s);
bool pressWhileInactive(QKineticScroller::Input input, const QPointF &position, qint64 timestamp);
bool moveWhilePressed(QKineticScroller::Input input, const QPointF &position, qint64 timestamp);
bool releaseWhilePressed(QKineticScroller::Input input, const QPointF &position, qint64 timestamp);
bool moveWhileDragging(QKineticScroller::Input input, const QPointF &position, qint64 timestamp);
bool releaseWhileDragging(QKineticScroller::Input input, const QPointF &position, qint64 timestamp);
bool pressWhileScrolling(QKineticScroller::Input input, const QPointF &position, qint64 timestamp);
void timerEvent(QTimerEvent *);
void timerEventWhileDragging();
void timerEventWhileScrolling();
void handleDrag(const QPointF &position, qint64 timestamp);
void updateVelocity(const QPointF &deltaPixel, qint64 deltaTime);
qreal decelerate(qreal v, qreal t);
QPointF calculateVelocity(qreal time);
void setContentPositionHelper(const QPointF &deltaPos);
QPointF realDpi(int screen);
static const char *stateName(QKineticScroller::State state);
static const char *inputName(QKineticScroller::Input input);
// metrics
qreal dragVelocitySmoothingFactor;
qreal linearDecelerationFactor;
qreal exponentialDecelerationBase;
qreal overshootSpringConstantRoot;
QPointF overshootMaximumDistance;
qreal overshootDragResistanceFactor;
qreal dragStartDistance;
qreal dragStartDirectionErrorMargin;
qreal maximumVelocity;
qreal minimumVelocity;
qreal maximumNonAcceleratedVelocity;
qreal maximumClickThroughVelocity;
qreal axisLockThreshold;
qreal fastSwipeBaseVelocity;
qreal fastSwipeMinimumVelocity;
qreal fastSwipeMaximumTime;
int framesPerSecond;
// state
bool enabled;
QKineticScroller::State state;
QKineticScroller::OvershootPolicy hOvershootPolicy;
QKineticScroller::OvershootPolicy vOvershootPolicy;
QPointF oldVelocity;
QPointF pressPosition;
QPointF lastPosition;
qint64 pressTimestamp;
qint64 lastTimestamp;
QPointF dragDistance; // the distance we should move during the next drag timer event
QPointF scrollToPosition;
bool scrollToX;
bool scrollToY;
QPointF overshootPosition; // the number of pixels we are overshooting (before overshootDragResistanceFactor)
bool overshootX;
bool overshootY;
qreal pixelPerMeter;
#if QT_VERSION < 0x040700
QTime scrollRelativeTimer;
QTime scrollAbsoluteTimer;
#else
QElapsedTimer scrollRelativeTimer;
QElapsedTimer scrollAbsoluteTimer;
#endif
QPointF releaseVelocity; // the starting velocity of the scrolling state
QPointF overshootVelocity; // the starting velocity when going into overshoot
qreal overshootStartTimeX;
qreal overshootStartTimeY;
int timerId;
bool cancelPress;
void (*debugHook)(void *user, const QPointF &releaseVelocity, const QPointF &position, const QPointF &overshootPosition);
void *debugHookUser;
QKineticScroller *q_ptr;
};
QT_END_NAMESPACE
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