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#ifndef QMLGRAPHICSFLICKABLE_H
#define QMLGRAPHICSFLICKABLE_H

#include "qmlgraphicsitem.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Declarative)

class QmlGraphicsFlickablePrivate;
class QmlGraphicsFlickableVisibleArea;
class Q_DECLARATIVE_EXPORT QmlGraphicsFlickable : public QmlGraphicsItem
{
    Q_OBJECT

    Q_PROPERTY(qreal viewportWidth READ viewportWidth WRITE setViewportWidth NOTIFY viewportWidthChanged)
    Q_PROPERTY(qreal viewportHeight READ viewportHeight WRITE setViewportHeight NOTIFY viewportHeightChanged)
    Q_PROPERTY(qreal viewportX READ viewportX WRITE setViewportX NOTIFY positionXChanged)
    Q_PROPERTY(qreal viewportY READ viewportY WRITE setViewportY NOTIFY positionYChanged)

    Q_PROPERTY(qreal horizontalVelocity READ horizontalVelocity NOTIFY horizontalVelocityChanged)
    Q_PROPERTY(qreal verticalVelocity READ verticalVelocity NOTIFY verticalVelocityChanged)
    Q_PROPERTY(qreal reportedVelocitySmoothing READ reportedVelocitySmoothing WRITE setReportedVelocitySmoothing NOTIFY reportedVelocitySmoothingChanged)

    Q_PROPERTY(bool overShoot READ overShoot WRITE setOverShoot)
    Q_PROPERTY(qreal maximumFlickVelocity READ maximumFlickVelocity WRITE setMaximumFlickVelocity)
    Q_PROPERTY(qreal flickDeceleration READ flickDeceleration WRITE setFlickDeceleration)
    Q_PROPERTY(bool moving READ isMoving NOTIFY movingChanged)
    Q_PROPERTY(bool flicking READ isFlicking NOTIFY flickingChanged)
    Q_PROPERTY(FlickDirection flickDirection READ flickDirection WRITE setFlickDirection NOTIFY flickDirectionChanged)

    Q_PROPERTY(bool interactive READ isInteractive WRITE setInteractive NOTIFY interactiveChanged)
    Q_PROPERTY(int pressDelay READ pressDelay WRITE setPressDelay)

    Q_PROPERTY(bool atXEnd READ isAtXEnd NOTIFY isAtBoundaryChanged)
    Q_PROPERTY(bool atYEnd READ isAtYEnd NOTIFY isAtBoundaryChanged)
    Q_PROPERTY(bool atXBeginning READ isAtXBeginning NOTIFY isAtBoundaryChanged)
    Q_PROPERTY(bool atYBeginning READ isAtYBeginning NOTIFY isAtBoundaryChanged)

    Q_PROPERTY(QmlGraphicsFlickableVisibleArea *visibleArea READ visibleArea CONSTANT)

    Q_PROPERTY(QmlList<QObject *>* flickableData READ flickableData)
    Q_PROPERTY(QmlList<QmlGraphicsItem *>* flickableChildren READ flickableChildren)
    Q_CLASSINFO("DefaultProperty", "flickableData")

    Q_ENUMS(FlickDirection)

public:
    QmlGraphicsFlickable(QmlGraphicsItem *parent=0);
    ~QmlGraphicsFlickable();

    QmlList<QObject *> *flickableData();
    QmlList<QmlGraphicsItem *> *flickableChildren();

    bool overShoot() const;
    void setOverShoot(bool);

    qreal viewportWidth() const;
    void setViewportWidth(qreal);

    qreal viewportHeight() const;
    void setViewportHeight(qreal);

    qreal viewportX() const;
    void setViewportX(qreal pos);

    qreal viewportY() const;
    void setViewportY(qreal pos);

    bool isMoving() const;
    bool isFlicking() const;

    int pressDelay() const;
    void setPressDelay(int delay);

    qreal reportedVelocitySmoothing() const;
    void setReportedVelocitySmoothing(qreal);

    qreal maximumFlickVelocity() const;
    void setMaximumFlickVelocity(qreal);

    qreal flickDeceleration() const;
    void setFlickDeceleration(qreal);

    bool isInteractive() const;
    void setInteractive(bool);

    qreal horizontalVelocity() const;
    qreal verticalVelocity() const;

    bool isAtXEnd() const;
    bool isAtXBeginning() const;
    bool isAtYEnd() const;
    bool isAtYBeginning() const;

    QmlGraphicsItem *viewport();

    enum FlickDirection { AutoFlickDirection=0x00, HorizontalFlick=0x01, VerticalFlick=0x02, HorizontalAndVerticalFlick=0x03 };
    FlickDirection flickDirection() const;
    void setFlickDirection(FlickDirection);

Q_SIGNALS:
    void viewportWidthChanged();
    void viewportHeightChanged();
    void positionXChanged();
    void positionYChanged();
    void movingChanged();
    void flickingChanged();
    void movementStarted();
    void movementEnded();
    void flickStarted();
    void flickEnded();
    void reportedVelocitySmoothingChanged(int);
    void horizontalVelocityChanged();
    void verticalVelocityChanged();
    void isAtBoundaryChanged();
    void pageChanged();
    void flickDirectionChanged();
    void interactiveChanged();

protected:
    virtual bool sceneEventFilter(QGraphicsItem *, QEvent *);
    void mousePressEvent(QGraphicsSceneMouseEvent *event);
    void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
    void wheelEvent(QGraphicsSceneWheelEvent *event);
    void timerEvent(QTimerEvent *event);

    QmlGraphicsFlickableVisibleArea *visibleArea();

protected Q_SLOTS:
    virtual void ticked();
    void movementStarting();
    void movementEnding();
    void heightChange();
    void widthChange();

protected:
    virtual qreal minXExtent() const;
    virtual qreal minYExtent() const;
    virtual qreal maxXExtent() const;
    virtual qreal maxYExtent() const;
    qreal vWidth() const;
    qreal vHeight() const;
    virtual void viewportMoved();
    bool sendMouseEvent(QGraphicsSceneMouseEvent *event);

    bool xflick() const;
    bool yflick() const;
    void cancelFlick();

protected:
    QmlGraphicsFlickable(QmlGraphicsFlickablePrivate &dd, QmlGraphicsItem *parent);

private:
    Q_DISABLE_COPY(QmlGraphicsFlickable)
    Q_DECLARE_PRIVATE_D(QGraphicsItem::d_ptr.data(), QmlGraphicsFlickable)
    friend class QmlGraphicsFlickableVisibleArea;
};

QT_END_NAMESPACE

QML_DECLARE_TYPE(QmlGraphicsFlickable)

QT_END_HEADER

#endif