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/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd
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** All rights reserved.
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** For any questions to The Qt Company, please use contact form at http://qt.io
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**
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** This file is part of the Qt Charts module.
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**
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** Licensees holding valid commercial license for Qt may use this file in
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** accordance with the Qt License Agreement provided with the Software
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** or, alternatively, in accordance with the terms contained in a written
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** agreement between you and The Qt Company.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.io
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**
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****************************************************************************/
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// W A R N I N G
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// -------------
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//
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// This file is not part of the Qt Chart API. It exists purely as an
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// implementation detail. This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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#ifndef SCROLLER_P_H
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#define SCROLLER_P_H
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#include <QtCharts/QChartGlobal>
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#include <QtCore/QObject>
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#include <QtCore/QBasicTimer>
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#include <QtCore/QTime>
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#include <QtCore/QPointF>
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QT_BEGIN_NAMESPACE
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class QGraphicsSceneMouseEvent;
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QT_END_NAMESPACE
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QT_CHARTS_BEGIN_NAMESPACE
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class Scroller;
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class QLegend;
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class ScrollTicker : public QObject
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{
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Q_OBJECT
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public:
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explicit ScrollTicker(Scroller *scroller, QObject *parent = 0);
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void start(int interval);
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void stop();
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protected:
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void timerEvent(QTimerEvent *event);
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private:
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QBasicTimer m_timer;
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Scroller *m_scroller;
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};
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class Scroller
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{
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public:
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enum State {
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Idle,
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Pressed,
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Move,
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Scroll
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};
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Scroller();
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virtual ~Scroller();
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virtual void setOffset(const QPointF &point) = 0;
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virtual QPointF offset() const = 0;
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void move(const QPointF &delta);
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void scrollTo(const QPointF &delta);
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void handleMousePressEvent(QGraphicsSceneMouseEvent *event);
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void handleMouseMoveEvent(QGraphicsSceneMouseEvent *event);
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void handleMouseReleaseEvent(QGraphicsSceneMouseEvent *event);
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void scrollTick();
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private:
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void startTicker(int interval);
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void stopTicker();
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private:
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void calculateSpeed(const QPointF &position);
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void lowerSpeed(QPointF &speed, qreal maxSpeed = 100);
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private:
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ScrollTicker m_ticker;
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QTime m_timeStamp;
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QPointF m_speed;
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QPointF m_fraction;
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int m_timeTresholdMin;
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int m_timeTresholdMax;
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State m_state;
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QPointF m_pressPos;
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QPointF m_lastPos;
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qreal m_treshold;
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};
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QT_CHARTS_END_NAMESPACE
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#endif /* SCROLLER_P_H */
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