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41 
42 #include <QtGui>
43 class StaticWidget : public QWidget
44 {
45 Q_OBJECT
46 public:
47     int hue;
48     bool pressed;
49     StaticWidget(QWidget *parent = 0)
QWidget(parent)50     :QWidget(parent)
51     {
52         setAttribute(Qt::WA_StaticContents);
53         setAttribute(Qt::WA_OpaquePaintEvent);
54            hue = 200;
55         pressed = false;
56     }
57 
58     // Update 4 rects in a checkerboard pattern, using either
59     // a QRegion or separate rects (see the useRegion switch)
updatePattern(QPoint pos)60     void updatePattern(QPoint pos)
61     {
62         const int rectSize = 10;
63         QRect rect(pos.x() - rectSize, pos.y() - rectSize, rectSize *2, rectSize * 2);
64 
65         QVector<QRect> updateRects;
66         updateRects.append(rect.translated(rectSize * 2, rectSize * 2));
67         updateRects.append(rect.translated(rectSize * 2, -rectSize * 2));
68         updateRects.append(rect.translated(-rectSize * 2, rectSize * 2));
69         updateRects.append(rect.translated(-rectSize * 2, -rectSize * 2));
70 
71 
72         bool useRegion = false;
73         if (useRegion) {
74             QRegion region;
75             region.setRects(updateRects.data(), 4);
76             update(region);
77         } else {
78             foreach (QRect rect, updateRects)
79                 update(rect);
80         }
81     }
82 
83 
resizeEvent(QResizeEvent *)84     void resizeEvent(QResizeEvent *)
85     {
86   //      qDebug() << "static widget resize from" << e->oldSize() << "to" << e->size();
87     }
88 
mousePressEvent(QMouseEvent * event)89     void mousePressEvent(QMouseEvent *event)
90     {
91 //        qDebug() << "mousePress at" << event->pos();
92         pressed = true;
93         updatePattern(event->pos());
94     }
95 
mouseReleaseEvent(QMouseEvent *)96     void mouseReleaseEvent(QMouseEvent *)
97     {
98         pressed = false;
99     }
100 
mouseMoveEvent(QMouseEvent * event)101     void mouseMoveEvent(QMouseEvent *event)
102     {
103         if (pressed)
104             updatePattern(event->pos());
105     }
106 
paintEvent(QPaintEvent * e)107     void paintEvent(QPaintEvent *e)
108     {
109         QPainter p(this);
110         static int color = 200;
111         color = (color + 41) % 205 + 50;
112 //        color = ((color + 45) %150) + 100;
113         qDebug() << "static widget repaint" << e->rect();
114         if (pressed)
115             p.fillRect(e->rect(), QColor::fromHsv(100, 255, color));
116         else
117             p.fillRect(e->rect(), QColor::fromHsv(hue, 255, color));
118         p.setPen(QPen(QColor(Qt::white)));
119 
120         for (int y = e->rect().top(); y <= e->rect().bottom() + 1; ++y) {
121             if (y % 20 == 0)
122                 p.drawLine(e->rect().left(), y, e->rect().right(), y);
123         }
124 
125         for (int x = e->rect().left(); x <= e->rect().right() +1 ; ++x) {
126             if (x % 20 == 0)
127                 p.drawLine(x, e->rect().top(), x, e->rect().bottom());
128         }
129     }
130 };
131