/
kineticscroller.h
41 lines (36 loc) · 1.1 KB
/
kineticscroller.h
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#ifndef KINETICSCROLLER_H
#define KINETICSCROLLER_H
#include <QObject>
#include <QVariant>
#include <QTimer>
#include <QTime>
#include <QPointF>
class KineticScroller: public QObject
{
Q_OBJECT
public:
KineticScroller();
public slots:
void mousePressed();
void mouseMoved(QVariant deltaX,QVariant deltaY);
void mouseReleased();
void kineticTimerEvent();
signals:
void kineticPan(QVariant deltaX, QVariant deltaY);
private:
void panFloatWrapper(const QPointF& delta);
private:
bool m_panActive;
QTimer* m_kineticTimer;
QTime m_lastMoveTime;
// Fractional pan, used by panFloatWrapper
QPointF m_remainingPan;
// current kinetic panning speed, in pixel/msec
QPointF m_kineticPanSpeed;
bool m_panDecellerate;
// An entry in the mouse history. first=speed, second=time
typedef QPair<QPointF, QTime> MouseHistoryEntry;
// A history of the last (currently 5) mouse move events is stored in order to smooth out movement detection for kinetic panning
QList<MouseHistoryEntry> m_mouseHistory;
};
#endif // KINETICSCROLLER_H