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/****************************************************************************
**
** Copyright (C) 2011 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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSCROLLER_P_H
#define QSCROLLER_P_H
//
// 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 <QObject>
#include <QPointer>
#include <QQueue>
#include <QSet>
#include <QEasingCurve>
#include <QElapsedTimer>
#include <QSizeF>
#include <QPointF>
#include <QRectF>
#include <qscroller.h>
#include <qscrollerproperties.h>
#include <private/qscrollerproperties_p.h>
#include <QAbstractAnimation>
QT_BEGIN_NAMESPACE
#ifndef QT_NO_GESTURES
class QFlickGestureRecognizer;
#endif
#ifndef QT_NO_ANIMATION
class QScrollTimer;
#endif
class QScrollerPrivate : public QObject
{
Q_OBJECT
Q_DECLARE_PUBLIC(QScroller)
public:
QScrollerPrivate(QScroller *q, QObject *target);
void init();
void sendEvent(QObject *o, QEvent *e);
void setState(QScroller::State s);
enum ScrollType {
ScrollTypeFlick = 0,
ScrollTypeScrollTo,
ScrollTypeOvershoot
};
struct ScrollSegment {
qint64 startTime;
qint64 deltaTime;
qreal startPos;
qreal deltaPos;
QEasingCurve curve;
qreal stopProgress; // whatever is..
qreal stopPos; // ..reached first
ScrollType type;
};
bool pressWhileInactive(const QPointF &position, qint64 timestamp);
bool moveWhilePressed(const QPointF &position, qint64 timestamp);
bool releaseWhilePressed(const QPointF &position, qint64 timestamp);
bool moveWhileDragging(const QPointF &position, qint64 timestamp);
bool releaseWhileDragging(const QPointF &position, qint64 timestamp);
bool pressWhileScrolling(const QPointF &position, qint64 timestamp);
void timerTick();
void timerEventWhileDragging();
void timerEventWhileScrolling();
bool prepareScrolling(const QPointF &position);
void handleDrag(const QPointF &position, qint64 timestamp);
QPointF realDpi(int screen);
QPointF dpi() const;
void setDpi(const QPointF &dpi);
void setDpiFromWidget(QWidget *widget);
void updateVelocity(const QPointF &deltaPixelRaw, qint64 deltaTime);
void pushSegment(ScrollType type, qreal deltaTime, qreal stopProgress, qreal startPos, qreal deltaPos, qreal stopPos, QEasingCurve::Type curve, Qt::Orientation orientation);
void recalcScrollingSegments(bool forceRecalc = false);
qreal scrollingSegmentsEndPos(Qt::Orientation orientation) const;
bool scrollingSegmentsValid(Qt::Orientation orientation);
void createScrollToSegments(qreal v, qreal deltaTime, qreal endPos, Qt::Orientation orientation, ScrollType type);
void createScrollingSegments(qreal v, qreal startPos, qreal ppm, Qt::Orientation orientation);
void setContentPositionHelperDragging(const QPointF &deltaPos);
void setContentPositionHelperScrolling();
qreal nextSnapPos(qreal p, int dir, Qt::Orientation orientation);
static qreal nextSegmentPosition(QQueue<ScrollSegment> &segments, qint64 now, qreal oldPos);
inline int frameRateSkip() const { return properties.d.data()->frameRate; }
static const char *stateName(QScroller::State state);
static const char *inputName(QScroller::Input input);
public slots:
void targetDestroyed();
public:
// non static
QObject *target;
QScrollerProperties properties;
#ifndef QT_NO_GESTURES
QFlickGestureRecognizer *recognizer;
Qt::GestureType recognizerType;
#endif
// scroller state:
// QPointer<QObject> scrollTarget;
QSizeF viewportSize;
QRectF contentPosRange;
QPointF contentPosition;
QPointF overshootPosition; // the number of pixels we are overshooting (before overshootDragResistanceFactor)
// state
bool enabled;
QScroller::State state;
bool firstScroll; // true if we haven't already send a scroll event
QPointF oldVelocity; // the release velocity of the last drag
QPointF pressPosition;
QPointF lastPosition;
qint64 pressTimestamp;
qint64 lastTimestamp;
QPointF dragDistance; // the distance we should move during the next drag timer event
QQueue<ScrollSegment> xSegments;
QQueue<ScrollSegment> ySegments;
// snap positions
QList<qreal> snapPositionsX;
qreal snapFirstX;
qreal snapIntervalX;
QList<qreal> snapPositionsY;
qreal snapFirstY;
qreal snapIntervalY;
QPointF pixelPerMeter;
QElapsedTimer monotonicTimer;
QPointF releaseVelocity; // the starting velocity of the scrolling state
#ifndef QT_NO_ANIMATION
QScrollTimer *scrollTimer;
#endif
QScroller *q_ptr;
};
QT_END_NAMESPACE
#endif // QSCROLLER_P_H
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