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| ** Copyright (C) 2015 The Qt Company Ltd. |
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| ** This file is part of the QtWidgets module of the Qt Toolkit. |
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| |
| #ifndef QSCROLLER_P_H |
| #define QSCROLLER_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 <QObject> |
| #include <QPointer> |
| #include <QQueue> |
| #include <QSet> |
| #include <QEasingCurve> |
| #include <QElapsedTimer> |
| #include <QSizeF> |
| #include <QPointF> |
| #include <QRectF> |
| #include <qscroller.h> |
| #include <qscrollerproperties.h> |
| #include <private/qscrollerproperties_p.h> |
| #include <QAbstractAnimation> |
| |
| QT_BEGIN_NAMESPACE |
| |
| #ifndef QT_NO_GESTURES |
| class QFlickGestureRecognizer; |
| #endif |
| |
| #ifndef QT_NO_ANIMATION |
| class QScrollTimer; |
| #endif |
| class QScrollerPrivate : public QObject |
| { |
| Q_OBJECT |
| Q_DECLARE_PUBLIC(QScroller) |
| |
| public: |
| QScrollerPrivate(QScroller *q, QObject *target); |
| void init(); |
| |
| void sendEvent(QObject *o, QEvent *e); |
| |
| void setState(QScroller::State s); |
| |
| enum ScrollType { |
| ScrollTypeFlick = 0, |
| ScrollTypeScrollTo, |
| ScrollTypeOvershoot |
| }; |
| |
| struct ScrollSegment { |
| qint64 startTime; |
| qint64 deltaTime; |
| qreal startPos; |
| qreal deltaPos; |
| QEasingCurve curve; |
| qreal stopProgress; // whatever is.. |
| qreal stopPos; // ..reached first |
| ScrollType type; |
| }; |
| |
| bool pressWhileInactive(const QPointF &position, qint64 timestamp); |
| bool moveWhilePressed(const QPointF &position, qint64 timestamp); |
| bool releaseWhilePressed(const QPointF &position, qint64 timestamp); |
| bool moveWhileDragging(const QPointF &position, qint64 timestamp); |
| bool releaseWhileDragging(const QPointF &position, qint64 timestamp); |
| bool pressWhileScrolling(const QPointF &position, qint64 timestamp); |
| |
| void timerTick(); |
| void timerEventWhileDragging(); |
| void timerEventWhileScrolling(); |
| |
| bool prepareScrolling(const QPointF &position); |
| void handleDrag(const QPointF &position, qint64 timestamp); |
| |
| QPointF realDpi(int screen); |
| QPointF dpi() const; |
| void setDpi(const QPointF &dpi); |
| void setDpiFromWidget(QWidget *widget); |
| |
| void updateVelocity(const QPointF &deltaPixelRaw, qint64 deltaTime); |
| void pushSegment(ScrollType type, qreal deltaTime, qreal stopProgress, qreal startPos, qreal deltaPos, qreal stopPos, QEasingCurve::Type curve, Qt::Orientation orientation); |
| void recalcScrollingSegments(bool forceRecalc = false); |
| qreal scrollingSegmentsEndPos(Qt::Orientation orientation) const; |
| bool scrollingSegmentsValid(Qt::Orientation orientation); |
| void createScrollToSegments(qreal v, qreal deltaTime, qreal endPos, Qt::Orientation orientation, ScrollType type); |
| void createScrollingSegments(qreal v, qreal startPos, |
| qreal deltaTime, qreal deltaPos, |
| Qt::Orientation orientation); |
| void createScrollingSegments(const QPointF &v, const QPointF &startPos, const QPointF &ppm); |
| |
| void setContentPositionHelperDragging(const QPointF &deltaPos); |
| void setContentPositionHelperScrolling(); |
| |
| qreal nextSnapPos(qreal p, int dir, Qt::Orientation orientation); |
| static qreal nextSegmentPosition(QQueue<ScrollSegment> &segments, qint64 now, qreal oldPos); |
| |
| inline int frameRateSkip() const { return properties.d.data()->frameRate; } |
| |
| static const char *stateName(QScroller::State state); |
| static const char *inputName(QScroller::Input input); |
| |
| public slots: |
| void targetDestroyed(); |
| |
| public: |
| // non static |
| QObject *target; |
| QScrollerProperties properties; |
| #ifndef QT_NO_GESTURES |
| QFlickGestureRecognizer *recognizer; |
| Qt::GestureType recognizerType; |
| #endif |
| |
| // scroller state: |
| |
| // QPointer<QObject> scrollTarget; |
| QSizeF viewportSize; |
| QRectF contentPosRange; |
| QPointF contentPosition; |
| QPointF overshootPosition; // the number of pixels we are overshooting (before overshootDragResistanceFactor) |
| |
| // state |
| |
| bool enabled; |
| QScroller::State state; |
| bool firstScroll; // true if we haven't already send a scroll event |
| |
| QPointF oldVelocity; // the release velocity of the last drag |
| |
| QPointF pressPosition; |
| QPointF lastPosition; |
| qint64 pressTimestamp; |
| qint64 lastTimestamp; |
| |
| QPointF dragDistance; // the distance we should move during the next drag timer event |
| |
| QQueue<ScrollSegment> xSegments; |
| QQueue<ScrollSegment> ySegments; |
| |
| // snap positions |
| QList<qreal> snapPositionsX; |
| qreal snapFirstX; |
| qreal snapIntervalX; |
| QList<qreal> snapPositionsY; |
| qreal snapFirstY; |
| qreal snapIntervalY; |
| |
| QPointF pixelPerMeter; |
| |
| QElapsedTimer monotonicTimer; |
| |
| QPointF releaseVelocity; // the starting velocity of the scrolling state |
| #ifndef QT_NO_ANIMATION |
| QScrollTimer *scrollTimer; |
| #endif |
| |
| QScroller *q_ptr; |
| }; |
| |
| |
| QT_END_NAMESPACE |
| |
| #endif // QSCROLLER_P_H |
| |