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+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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
+
+class QFlickGestureRecognizer;
+
+class QScrollTimer;
+
+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 maxProgress;
+ 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 startPos, qreal endPos, QEasingCurve::Type curve, Qt::Orientation orientation, qreal maxProgress = 1.0);
+ 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 ppm, Qt::Orientation orientation);
+
+ 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:
+ // static
+ static QMap<QObject *, QScroller *> allScrollers;
+ static QSet<QScroller *> activeScrollers;
+
+ // non static
+ QObject *target;
+ QScrollerProperties properties;
+ QFlickGestureRecognizer *recognizer;
+ Qt::GestureType recognizerType;
+
+ // 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
+ QScrollTimer *scrollTimer;
+
+ QScroller *q_ptr;
+};
+
+
+QT_END_NAMESPACE
+
+#endif // QSCROLLER_P_H
+