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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
// W A R N I N G
// -------------
//
// This file is not part of the Qt 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 <QtCharts/QChartGlobal>
#include <QtCore/QObject>
#include <QtCore/QBasicTimer>
#include <QtCore/QElapsedTimer>
#include <QtCore/QPointF>
#include <QtCharts/private/qchartglobal_p.h>
QT_BEGIN_NAMESPACE
class QGraphicsSceneMouseEvent;
QT_END_NAMESPACE
QT_BEGIN_NAMESPACE
class Scroller;
class QLegend;
class Q_CHARTS_EXPORT ScrollTicker : public QObject
{
Q_OBJECT
public:
explicit ScrollTicker(Scroller *scroller, QObject *parent = 0);
void start(int interval);
void stop();
protected:
void timerEvent(QTimerEvent *event) override;
private:
QBasicTimer m_timer;
Scroller *m_scroller;
};
class Q_CHARTS_EXPORT Scroller
{
public:
enum State {
Idle,
Pressed,
Move,
Scroll
};
Scroller();
virtual ~Scroller();
virtual void setOffset(const QPointF &point) = 0;
virtual QPointF offset() const = 0;
void move(const QPointF &delta);
void scrollTo(const QPointF &delta);
void handleMousePressEvent(QGraphicsSceneMouseEvent *event);
void handleMouseMoveEvent(QGraphicsSceneMouseEvent *event);
void handleMouseReleaseEvent(QGraphicsSceneMouseEvent *event);
void scrollTick();
private:
void startTicker(int interval);
void stopTicker();
private:
void calculateSpeed(const QPointF &position);
void lowerSpeed(QPointF &speed, qreal maxSpeed = 100);
private:
ScrollTicker m_ticker;
QElapsedTimer m_timeStamp;
QPointF m_speed;
QPointF m_fraction;
int m_timeTresholdMin;
int m_timeTresholdMax;
State m_state;
QPointF m_pressPos;
QPointF m_lastPos;
qreal m_treshold;
};
QT_END_NAMESPACE
#endif /* SCROLLER_P_H */
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