| 1 | // Copyright (C) 2016 Research In Motion. |
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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 QQUICKFLICKABLEBEHAVIOR_H |
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| 5 | #define QQUICKFLICKABLEBEHAVIOR_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 | /* ### Platform specific flickable mechanics are defined either here, or in |
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| 19 | mkspec files. Long-term (QtQuick 3) Flickable needs to allow such |
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| 20 | mechanic details to be controlled via QML so that platforms can easily |
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| 21 | load custom behavior at QML compile time. |
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| 22 | */ |
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| 23 | |
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| 24 | // The maximum number of pixels a flick can overshoot |
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| 25 | #ifndef QML_FLICK_OVERSHOOT |
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| 26 | #define QML_FLICK_OVERSHOOT 150 |
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| 27 | #endif |
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| 28 | |
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| 29 | // The number of samples to use in calculating the velocity of a flick |
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| 30 | #ifndef QML_FLICK_SAMPLEBUFFER |
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| 31 | #define QML_FLICK_SAMPLEBUFFER 3 |
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| 32 | #endif |
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| 33 | |
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| 34 | // The number of samples to discard when calculating the flick velocity. |
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| 35 | // Touch panels often produce inaccurate results as the finger is lifted. |
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| 36 | #ifndef QML_FLICK_DISCARDSAMPLES |
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| 37 | #define QML_FLICK_DISCARDSAMPLES 0 |
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| 38 | #endif |
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| 39 | |
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| 40 | // How much faster to decelerate when overshooting |
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| 41 | #ifndef QML_FLICK_OVERSHOOTFRICTION |
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| 42 | #define QML_FLICK_OVERSHOOTFRICTION 8 |
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| 43 | #endif |
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| 44 | |
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| 45 | // Multiflick acceleration minimum flick velocity threshold |
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| 46 | #ifndef QML_FLICK_MULTIFLICK_THRESHOLD |
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| 47 | #define QML_FLICK_MULTIFLICK_THRESHOLD 1250 |
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| 48 | #endif |
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| 49 | |
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| 50 | // If the time (ms) between the last move and the release exceeds this, then velocity will be zero. |
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| 51 | #ifndef QML_FLICK_VELOCITY_DECAY_TIME |
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| 52 | #define QML_FLICK_VELOCITY_DECAY_TIME 50 |
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| 53 | #endif |
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| 54 | |
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| 55 | // Multiflick acceleration minimum contentSize/viewSize ratio |
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| 56 | #ifndef QML_FLICK_MULTIFLICK_RATIO |
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| 57 | #define QML_FLICK_MULTIFLICK_RATIO 10 |
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| 58 | #endif |
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| 59 | |
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| 60 | // Multiflick acceleration maximum velocity multiplier |
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| 61 | #ifndef QML_FLICK_MULTIFLICK_MAXBOOST |
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| 62 | #define QML_FLICK_MULTIFLICK_MAXBOOST 3.0 |
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| 63 | #endif |
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| 64 | |
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| 65 | // Really slow flicks can be annoying. |
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| 66 | const qreal _q_MinimumFlickVelocity = 75.0; |
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| 67 | |
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| 68 | // If QQuickFlickablePrivate::wheelDeceleration (perhaps overridden via QT_QUICK_FLICKABLE_WHEEL_DECELERATION) |
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| 69 | // is greater than this, we switch to proportional wheel scrolling: no "acceleration" at all. |
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| 70 | const qreal _q_MaximumWheelDeceleration = 14999; |
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| 71 | |
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| 72 | #endif //QQUICKFLICKABLEBEHAVIOR_H |
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| 73 | |
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