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#ifndef QDECLARATIVEFLICKABLE_P_H

#define QDECLARATIVEFLICKABLE_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 "private/qdeclarativeflickable_p.h"

#include "private/qdeclarativeitem_p.h"

#include "private/qdeclarativeitemchangelistener_p.h"

#include <qdeclarative.h>

#include <qdeclarativetimeline_p_p.h>

#include <qdeclarativeanimation_p_p.h>

#include <qdatetime.h>

QT_BEGIN_NAMESPACE

class QDeclarativeFlickableVisibleArea;

class QDeclarativeFlickablePrivate : public QDeclarativeItemPrivate, public QDeclarativeItemChangeListener

{

    Q_DECLARE_PUBLIC(QDeclarativeFlickable)

public:

    QDeclarativeFlickablePrivate();

    void init();

    struct Velocity : public QDeclarativeTimeLineValue

    {

        Velocity(QDeclarativeFlickablePrivate *p)

            : parent(p) {}

        virtual void setValue(qreal v) {

            if (v != value()) {

                QDeclarativeTimeLineValue::setValue(v);

                parent->updateVelocity();

            }

        }

        QDeclarativeFlickablePrivate *parent;

    };

    struct AxisData {

        AxisData(QDeclarativeFlickablePrivate *fp, void (QDeclarativeFlickablePrivate::*func)(qreal))

            : move(fp, func), viewSize(-1), smoothVelocity(fp), atEnd(false), atBeginning(true)

        {}

        QDeclarativeTimeLineValueProxy<QDeclarativeFlickablePrivate> move;

        qreal viewSize;

        qreal pressPos;

        qreal velocity;

        qreal flickTarget;

        QDeclarativeFlickablePrivate::Velocity smoothVelocity;

        bool atEnd : 1;

        bool atBeginning : 1;

    };

    void flickX(qreal velocity);

    void flickY(qreal velocity);

    virtual void flick(AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize,

                        QDeclarativeTimeLineCallback::Callback fixupCallback, qreal velocity);

    void fixupX();

    void fixupY();

    virtual void fixup(AxisData &data, qreal minExtent, qreal maxExtent);

    void updateBeginningEnd();

    void captureDelayedPress(QGraphicsSceneMouseEvent *event);

    void clearDelayedPress();

    void setRoundedViewportX(qreal x);

    void setRoundedViewportY(qreal y);

    qreal overShootDistance(qreal velocity, qreal size);

    void itemGeometryChanged(QDeclarativeItem *, const QRectF &, const QRectF &);

public:

    QDeclarativeItem *contentItem;

    AxisData hData;

    AxisData vData;

    QDeclarativeTimeLine timeline;

    bool flickingHorizontally : 1;

    bool flickingVertically : 1;

    bool hMoved : 1;

    bool vMoved : 1;

    bool movingHorizontally : 1;

    bool movingVertically : 1;

    bool stealMouse : 1;

    bool pressed : 1;

    bool interactive : 1;

    QElapsedTimer lastPosTime;

    QPointF lastPos;

    QPointF pressPos;

    QElapsedTimer pressTime;

    qreal deceleration;

    qreal maxVelocity;

    QElapsedTimer velocityTime;

    QPointF lastFlickablePosition;

    qreal reportedVelocitySmoothing;

    QGraphicsSceneMouseEvent *delayedPressEvent;

    QGraphicsItem *delayedPressTarget;

    QBasicTimer delayedPressTimer;

    int pressDelay;

    int fixupDuration;

    static void fixupY_callback(void *);

    static void fixupX_callback(void *);

    void updateVelocity();

    int vTime;

    QDeclarativeTimeLine velocityTimeline;

    QDeclarativeFlickableVisibleArea *visibleArea;

    QDeclarativeFlickable::FlickableDirection flickableDirection;

    QDeclarativeFlickable::BoundsBehavior boundsBehavior;

    void handleMousePressEvent(QGraphicsSceneMouseEvent *);

    void handleMouseMoveEvent(QGraphicsSceneMouseEvent *);

    void handleMouseReleaseEvent(QGraphicsSceneMouseEvent *);

    // flickableData property

    static void data_append(QDeclarativeListProperty<QObject> *, QObject *);

};

class QDeclarativeFlickableVisibleArea : public QObject

{

    Q_OBJECT

    Q_PROPERTY(qreal xPosition READ xPosition NOTIFY pageChanged)

    Q_PROPERTY(qreal yPosition READ yPosition NOTIFY pageChanged)

    Q_PROPERTY(qreal widthRatio READ widthRatio NOTIFY pageChanged)

    Q_PROPERTY(qreal heightRatio READ heightRatio NOTIFY pageChanged)

public:

    QDeclarativeFlickableVisibleArea(QDeclarativeFlickable *parent=0);

    qreal xPosition() const;

    qreal widthRatio() const;

    qreal yPosition() const;

    qreal heightRatio() const;

    void updateVisible();

signals:

    void pageChanged();

private:

    QDeclarativeFlickable *flickable;

    qreal m_xPosition;

    qreal m_widthRatio;

    qreal m_yPosition;

    qreal m_heightRatio;

};

QT_END_NAMESPACE

QML_DECLARE_TYPE(QDeclarativeFlickableVisibleArea)

#endif