Qt 通过绘画设置边框阴影

1. 首先widget设置
2. setWindowFlags(Qt::FramelessWindowHint);
3. setAttribute(Qt::WA_TranslucentBackground, true);

1. 然后重载paintevent
2. void ShadowMethod::paintEvent(QPaintEvent *event)
3. {
4. QPainterPath path;
5. path.setFillRule(Qt::WindingFill);
6. path.addRect(10, 10, this->width()-20, this->height()-20);
7. QPainter painter(this);
8. painter.setRenderHint(QPainter::Antialiasing, true);
9. painter.fillPath(path, QBrush(Qt::white));
10. QColor color(92,93,95,50);
11. int arr[10] = {150,120,80,50,40,30,20,10,5,5};
12. for(int i=0; i<10; i++)
13. {
14. QPainterPath path;
15. path.setFillRule(Qt::WindingFill);
16. if(i == 5)
17. path.addRect(10-i-1, 10-i-1, this->width()-(10-i)*2, this->height()-(10-i)*2);
18. else
19. path.addRoundedRect(10-i-1, 10-i-1, this->width()-(10-i)*2, this->height()-(10-i)*2,2,2);
20. color.setAlpha(arr[i]);
21. painter.setPen(color);
22. painter.drawPath(path);
23. }
24. }

1. 效果图：

1. <img src="http://img.blog.csdn.net/20171011165958714?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQveHpwYmxvZw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="">

 

https://blog.csdn.net/xzpblog/article/details/78205710