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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWidgets module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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 <QtWidgets/private/qtwidgetsglobal_p.h>
#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>
#if QT_CONFIG(animation)
#include <QAbstractAnimation>
#endif
QT_BEGIN_NAMESPACE
#ifndef QT_NO_GESTURES
class QFlickGestureRecognizer;
#endif
#if QT_CONFIG(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 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) const;
void createScrollToSegments(qreal v, qreal deltaTime, qreal endPos, Qt::Orientation orientation, ScrollType type);
void createScrollingSegments(qreal v, qreal startPos,
qreal deltaTime, qreal deltaPos,
Qt::Orientation orientation);
void createScrollingSegments(const QPointF &v, const QPointF &startPos, const QPointF &ppm);
void setContentPositionHelperDragging(const QPointF &deltaPos);
void setContentPositionHelperScrolling();
qreal nextSnapPos(qreal p, int dir, Qt::Orientation orientation) const;
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
#if QT_CONFIG(animation)
QScrollTimer *scrollTimer;
#endif
QScroller *q_ptr;
};
template <>
class QTypeInfo<QScrollerPrivate::ScrollSegment>
: public QTypeInfoMerger<QScrollerPrivate::ScrollSegment, QEasingCurve> {};
QT_END_NAMESPACE
#endif // QSCROLLER_P_H
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