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40 
41 #ifndef WIDGET_H
42 #define WIDGET_H
43 
44 #include <QWidget>
45 
46 //! [0]
47 class Helper;
48 QT_BEGIN_NAMESPACE
49 class QPaintEvent;
50 QT_END_NAMESPACE
51 
52 class Widget : public QWidget
53 {
54     Q_OBJECT
55 
56 public:
57     Widget(Helper *helper, QWidget *parent);
58 
59 public slots:
60     void animate();
61 
62 protected:
63     void paintEvent(QPaintEvent *event);
64 
65 private:
66     Helper *helper;
67     int elapsed;
68 };
69 //! [0]
70 
71 #endif
72