| 1 | // Copyright (C) 2021 The Qt Company Ltd. |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | |
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| 4 | #ifndef QQUICKVELOCITYCALCULATOR_P_P_H |
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| 5 | #define QQUICKVELOCITYCALCULATOR_P_P_H |
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| 6 | |
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| 7 | // |
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| 8 | // W A R N I N G |
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| 9 | // ------------- |
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| 10 | // |
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| 11 | // This file is not part of the Qt API. It exists purely as an |
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| 12 | // implementation detail. This header file may change from version to |
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| 13 | // version without notice, or even be removed. |
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| 14 | // |
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| 15 | // We mean it. |
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| 16 | // |
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| 17 | |
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| 18 | #include <QtCore/qpoint.h> |
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| 19 | #include <QtCore/qelapsedtimer.h> |
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| 20 | #include <QtCore/private/qglobal_p.h> |
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| 21 | |
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| 22 | QT_BEGIN_NAMESPACE |
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| 23 | |
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| 24 | class QQuickVelocityCalculator |
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| 25 | { |
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| 26 | public: |
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| 27 | void startMeasuring(const QPointF &point1, qint64 timestamp = 0); |
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| 28 | void stopMeasuring(const QPointF &m_point2, qint64 timestamp = 0); |
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| 29 | void reset(); |
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| 30 | QPointF velocity() const; |
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| 31 | |
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| 32 | private: |
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| 33 | QPointF m_point1; |
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| 34 | QPointF m_point2; |
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| 35 | qint64 m_point1Timestamp = 0; |
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| 36 | qint64 m_point2Timestamp = 0; |
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| 37 | // When a timestamp isn't available, we must use a timer. |
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| 38 | // When stopMeasuring() has been called, we store the elapsed time in point2timestamp. |
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| 39 | QElapsedTimer m_timer; |
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| 40 | }; |
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| 41 | |
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| 42 | QT_END_NAMESPACE |
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| 43 | |
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| 44 | #endif // QQUICKVELOCITYCALCULATOR_P_P_H |
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| 45 | |
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