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    41 

    42 #ifndef DEMO_ITEM_H

    43 #define DEMO_ITEM_H

    44 

    45 #include <QtGui>

    46 

    47 class DemoItemAnimation;

    48 class Guide;

    49 

    50 class SharedImage

    51 {

    52 public:

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

    54     ~SharedImage()

    55     {

    56         delete image;

    57         delete pixmap;

    58     }

    59 

    60     int refCount;

    61     QImage *image;

    62     QPixmap *pixmap;

    63     QMatrix matrix;

    64     QRectF unscaledBoundingRect;

    65 };

    66 

    67 class DemoItem : public QGraphicsItem

    68 {

    69 

    70 public:

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

    72     virtual ~DemoItem();

    73 

    74     bool inTransition();

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

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

    77     virtual void prepare(){};

    78     void setRecursiveVisible(bool visible);

    79     void useSharedImage(const QString &hashKey);

    80     void setNeverVisible(bool never = true);

    81     static void setMatrix(const QMatrix &matrix);

    82     virtual QRectF boundingRect() const; // overridden

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

    84 

    85     qreal opacity;

    86     bool locked;

    87     DemoItemAnimation *currentAnimation;

    88     bool noSubPixeling;

    89 

    90     // Used if controlled by a guide:

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

    92     void guideAdvance(float distance);

    93     void guideMove(float moveSpeed);

    94     void setGuidedPos(const QPointF &position);

    95     QPointF getGuidedPos();

    96     float startFrame;

    97     float guideFrame;

    98     Guide *currGuide;

    99 

   100 protected:

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

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

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

   104     bool prepared;

   105 

   106 private:

   107     SharedImage *sharedImage;

   108     QString hashKey;

   109     bool neverVisible;

   110     bool validateImage();

   111 

   112     // Used if controlled by a guide:

   113     void switchGuide(Guide *guide);

   114     friend class Guide;

   115     QPointF guidedPos;

   116 

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

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

   119     static QHash<QString, SharedImage *> sharedImageHash;

   120     static QMatrix matrix;

   121 };

   122 

   123 #endif // DEMO_ITEM_H

   124