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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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QKINETICSCROLLER_H
#define QKINETICSCROLLER_H
#include <QtCore/qmetatype.h>
#include <QtCore/qpoint.h>
#include <QtCore/qrect.h>
#include <QtCore/qvariant.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Gui)
class QKineticScrollerPrivate;
class QKineticScroller
{
public:
virtual ~QKineticScroller();
bool isEnabled() const;
void setEnabled(bool b);
enum State
{
StateInactive,
StatePressed,
StateDragging,
StateScrolling,
};
State state() const;
void reset();
enum OvershootPolicy
{
OvershootWhenScrollable,
OvershootAlwaysOff,
OvershootAlwaysOn,
};
OvershootPolicy horizontalOvershootPolicy() const;
void setHorizontalOvershootPolicy(OvershootPolicy policy);
OvershootPolicy verticalOvershootPolicy() const;
void setVerticalOvershootPolicy(OvershootPolicy policy);
enum ScrollMetric
{
DragVelocitySmoothingFactor, // qreal [0..1/s] (complex calculation involving time) v = v_new* DASF + v_old * (1-DASF)
LinearDecelerationFactor, // qreal [m/s^2]
ExponentialDecelerationBase, // qreal
OvershootSpringConstant, // qreal [kg/s^2]
OvershootDragResistanceFactor, // qreal [0..1]
OvershootMaximumDistance, // QPointF([m], [m])
DragStartDistance, // qreal [m]
DragStartDirectionErrorMargin, // qreal [m]
MinimumVelocity, // qreal [m/s]
MaximumVelocity, // qreal [m/s]
MaximumNonAcceleratedVelocity, // qreal [m/s]
MaximumClickThroughVelocity, // qreal [m/s]
AxisLockThreshold, // qreal [0..1] atan(|min(dx,dy)|/|max(dx,dy)|)
FramesPerSecond, // int [frames/s]
FastSwipeMaximumTime, // qreal [s]
FastSwipeMinimumVelocity, // qreal [m/s]
FastSwipeBaseVelocity, // qreal [m/s]
ScrollMetricCount
};
QVariant scrollMetric(ScrollMetric metric) const;
void setScrollMetric(ScrollMetric metric, const QVariant &value);
void resetScrollMetrics();
void scrollTo(const QPointF &pos, int scrollTime = 1000);
void ensureVisible(const QPointF &pos, int xmargin, int ymargin, int scrollTime = 1000);
qreal dpi() const;
void setDpi(qreal dpi);
void setDpiFromWidget(QWidget *widget);
void registerDebugHook(void (*callback)(void *user, const QPointF &releaseVelocity, const QPointF &position, const QPointF &overshootPosition), void *user);
protected:
explicit QKineticScroller();
virtual QSizeF viewportSize() const = 0;
virtual QPointF maximumContentPosition() const = 0;
virtual QPointF contentPosition() const = 0;
virtual void setContentPosition(const QPointF &pos, const QPointF &overshootDelta) = 0;
virtual void stateChanged(State oldState);
virtual bool canStartScrollingAt(const QPointF &pos) const;
virtual void cancelPress(const QPointF &pressPos);
enum Input {
InputPress,
InputMove,
InputRelease
};
bool handleInput(Input input, const QPointF &position, qint64 timestamp);
QKineticScroller(QKineticScrollerPrivate &dd);
QScopedPointer<QKineticScrollerPrivate> d_ptr;
private:
Q_DISABLE_COPY(QKineticScroller)
Q_DECLARE_PRIVATE(QKineticScroller)
};
QT_END_NAMESPACE
Q_DECLARE_METATYPE(QKineticScroller *)
QT_END_HEADER
#endif // QKINETICSCROLLER_H
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