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Diffstat (limited to 'src/quicktemplates/qquickvelocitycalculator_p_p.h')
| -rw-r--r-- | src/quicktemplates/qquickvelocitycalculator_p_p.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/quicktemplates/qquickvelocitycalculator_p_p.h b/src/quicktemplates/qquickvelocitycalculator_p_p.h new file mode 100644 index 0000000000..c7e51e38e7 --- /dev/null +++ b/src/quicktemplates/qquickvelocitycalculator_p_p.h @@ -0,0 +1,44 @@ +// Copyright (C) 2021 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only + +#ifndef QQUICKVELOCITYCALCULATOR_P_P_H +#define QQUICKVELOCITYCALCULATOR_P_P_H + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt 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. +// + +#include <QtCore/qpoint.h> +#include <QtCore/qelapsedtimer.h> +#include <QtCore/private/qglobal_p.h> + +QT_BEGIN_NAMESPACE + +class QQuickVelocityCalculator +{ +public: + void startMeasuring(const QPointF &point1, qint64 timestamp = 0); + void stopMeasuring(const QPointF &m_point2, qint64 timestamp = 0); + void reset(); + QPointF velocity() const; + +private: + QPointF m_point1; + QPointF m_point2; + qint64 m_point1Timestamp = 0; + qint64 m_point2Timestamp = 0; + // When a timestamp isn't available, we must use a timer. + // When stopMeasuring() has been called, we store the elapsed time in point2timestamp. + QElapsedTimer m_timer; +}; + +QT_END_NAMESPACE + +#endif // QQUICKVELOCITYCALCULATOR_P_P_H |