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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:
SharedImage()53     SharedImage() : refCount(0), image(0), pixmap(0){};
~SharedImage()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); };
prepare()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
createImage(const QMatrix &)102     virtual QImage *createImage(const QMatrix &) const { return 0; };
collidesWithItem(const QGraphicsItem *,Qt::ItemSelectionMode)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 
125