| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only |
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| 3 | |
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| 4 | // W A R N I N G |
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| 5 | // ------------- |
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| 6 | // |
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| 7 | // This file is not part of the Qt Chart API. It exists purely as an |
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| 8 | // implementation detail. This header file may change from version to |
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| 9 | // version without notice, or even be removed. |
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| 10 | // |
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| 11 | // We mean it. |
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| 12 | |
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| 13 | #ifndef SCROLLER_P_H |
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| 14 | #define SCROLLER_P_H |
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| 15 | |
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| 16 | #include <QtCharts/QChartGlobal> |
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| 17 | #include <QtCore/QObject> |
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| 18 | #include <QtCore/QBasicTimer> |
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| 19 | #include <QtCore/QElapsedTimer> |
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| 20 | #include <QtCore/QPointF> |
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| 21 | #include <QtCharts/private/qchartglobal_p.h> |
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| 22 | |
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| 23 | QT_BEGIN_NAMESPACE |
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| 24 | class QGraphicsSceneMouseEvent; |
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| 25 | QT_END_NAMESPACE |
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| 26 | |
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| 27 | QT_BEGIN_NAMESPACE |
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| 28 | |
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| 29 | class Scroller; |
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| 30 | class QLegend; |
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| 31 | |
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| 32 | class Q_CHARTS_PRIVATE_EXPORT ScrollTicker : public QObject |
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| 33 | { |
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| 34 | Q_OBJECT |
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| 35 | public: |
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| 36 | explicit ScrollTicker(Scroller *scroller, QObject *parent = 0); |
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| 37 | void start(int interval); |
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| 38 | void stop(); |
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| 39 | protected: |
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| 40 | void timerEvent(QTimerEvent *event) override; |
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| 41 | |
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| 42 | private: |
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| 43 | QBasicTimer m_timer; |
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| 44 | Scroller *m_scroller; |
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| 45 | }; |
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| 46 | |
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| 47 | class Q_CHARTS_PRIVATE_EXPORT Scroller |
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| 48 | { |
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| 49 | public: |
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| 50 | enum State { |
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| 51 | Idle, |
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| 52 | Pressed, |
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| 53 | Move, |
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| 54 | Scroll |
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| 55 | }; |
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| 56 | |
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| 57 | Scroller(); |
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| 58 | virtual ~Scroller(); |
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| 59 | |
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| 60 | virtual void setOffset(const QPointF &point) = 0; |
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| 61 | virtual QPointF offset() const = 0; |
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| 62 | |
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| 63 | void move(const QPointF &delta); |
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| 64 | void scrollTo(const QPointF &delta); |
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| 65 | |
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| 66 | void handleMousePressEvent(QGraphicsSceneMouseEvent *event); |
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| 67 | void handleMouseMoveEvent(QGraphicsSceneMouseEvent *event); |
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| 68 | void handleMouseReleaseEvent(QGraphicsSceneMouseEvent *event); |
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| 69 | |
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| 70 | void scrollTick(); |
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| 71 | |
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| 72 | private: |
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| 73 | void startTicker(int interval); |
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| 74 | void stopTicker(); |
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| 75 | |
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| 76 | private: |
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| 77 | void calculateSpeed(const QPointF &position); |
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| 78 | void lowerSpeed(QPointF &speed, qreal maxSpeed = 100); |
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| 79 | |
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| 80 | private: |
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| 81 | ScrollTicker m_ticker; |
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| 82 | QElapsedTimer m_timeStamp; |
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| 83 | QPointF m_speed; |
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| 84 | QPointF m_fraction; |
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| 85 | int m_timeTresholdMin; |
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| 86 | int m_timeTresholdMax; |
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| 87 | |
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| 88 | State m_state; |
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| 89 | QPointF m_pressPos; |
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| 90 | QPointF m_lastPos; |
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| 91 | qreal m_treshold; |
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| 92 | }; |
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| 93 | |
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| 94 | QT_END_NAMESPACE |
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| 95 | |
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| 96 | #endif /* SCROLLER_P_H */ |
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| 97 | |
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