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#ifndef DEMO_ITEM_H

#define DEMO_ITEM_H

#include <QtGui>

class DemoItemAnimation;

class Guide;

class SharedImage

{

public:

    SharedImage() : refCount(0), image(0), pixmap(0){};

    ~SharedImage()

    {

        delete image;

        delete pixmap;

    }

    int refCount;

    QImage *image;

    QPixmap *pixmap;

    QMatrix matrix;

    QRectF unscaledBoundingRect;

};

class DemoItem : public QGraphicsItem

{

public:

    DemoItem(QGraphicsScene *scene = 0, QGraphicsItem *parent = 0);

    virtual ~DemoItem();

    bool inTransition();

    virtual void animationStarted(int id = 0){ Q_UNUSED(id); };

    virtual void animationStopped(int id = 0){ Q_UNUSED(id); };

    virtual void prepare(){};

    void setRecursiveVisible(bool visible);

    void useSharedImage(const QString &hashKey);

    void setNeverVisible(bool never = true);

    static void setMatrix(const QMatrix &matrix);

    virtual QRectF boundingRect() const; // overridden

    void setPosUsingSheepDog(const QPointF &dest, const QRectF &sceneFence);

    qreal opacity;

    bool locked;

    DemoItemAnimation *currentAnimation;

    bool noSubPixeling;

    // Used if controlled by a guide:

    void useGuide(Guide *guide, float startFrame = 0);

    void guideAdvance(float distance);

    void guideMove(float moveSpeed);

    void setGuidedPos(const QPointF &position);

    QPointF getGuidedPos();

    float startFrame;

    float guideFrame;

    Guide *currGuide;

protected:

    virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option = 0, QWidget *widget = 0); // overridden

    virtual QImage *createImage(const QMatrix &) const { return 0; };

    virtual bool collidesWithItem(const QGraphicsItem *, Qt::ItemSelectionMode) const { return false; };

    bool prepared;

private:

    SharedImage *sharedImage;

    QString hashKey;

    bool neverVisible;

    bool validateImage();

    // Used if controlled by a guide:

    void switchGuide(Guide *guide);

    friend class Guide;

    QPointF guidedPos;

    // The next static hash is shared amongst all demo items, and

    // has the purpose of reusing images to save memory and time

    static QHash<QString, SharedImage *> sharedImageHash;

    static QMatrix matrix;

};

#endif // DEMO_ITEM_H