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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the Qt Commercial Charts Add-on.
**
** $QT_BEGIN_LICENSE$
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
** $QT_END_LICENSE$
**
****************************************************************************/
// W A R N I N G
// -------------
//
// This file is not part of the QtCommercial Chart 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.
#ifndef SCROLLER_P_H
#define SCROLLER_P_H
#include "qchartglobal.h"
#include <QBasicTimer>
#include <QTime>
#include <QPointF>
class QGraphicsSceneMouseEvent;
QTCOMMERCIALCHART_BEGIN_NAMESPACE
class Scroller;
class QLegend;
class ScrollTicker : public QObject
{
Q_OBJECT
public:
explicit ScrollTicker(Scroller *scroller, QObject *parent = 0);
void start(int interval);
void stop();
protected:
void timerEvent(QTimerEvent *event);
private:
QBasicTimer m_timer;
Scroller *m_scroller;
};
class Scroller
{
public:
enum State {
Idle,
Pressed,
Move,
Scroll,
Stop
};
Scroller();
virtual ~Scroller();
virtual void setOffset(const QPointF &point) = 0;
virtual QPointF offset() const = 0;
public:
void scrollTick();
public:
void mousePressEvent(QGraphicsSceneMouseEvent *event);
void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
private:
void calculateSpeed(const QPointF &position);
void lowerSpeed(QPointF &speed, qreal maxSpeed = 100);
private:
ScrollTicker m_ticker;
State m_state;
QTime m_timeStamp;
QPointF m_press;
QPointF m_offset;
QPointF m_speed;
QPointF m_distance;
QPointF m_fraction;
int m_moveThreshold;
int m_timeTreshold;
};
QTCOMMERCIALCHART_END_NAMESPACE
#endif /* SCROLLER_P_H */
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