Qt 通过绘画设置边框阴影

Posted 2020-10-28 朝闻道

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

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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.   
8.      QPainter painter(this);  
9.      painter.setRenderHint(QPainter::Antialiasing, true);  
10.      painter.fillPath(path, QBrush(Qt::white));  
11.   
12.      QColor color(92,93,95,50);  
13.      int arr[10] = {150,120,80,50,40,30,20,10,5,5};  
14.      for(int i=0; i<10; i++)  
15.      {  
16.          QPainterPath path;  
17.          path.setFillRule(Qt::WindingFill);  
18.          if(i == 5)  
19.              path.addRect(10-i-1, 10-i-1, this->width()-(10-i)*2, this->height()-(10-i)*2);  
20.          else  
21.             path.addRoundedRect(10-i-1, 10-i-1, this->width()-(10-i)*2, this->height()-(10-i)*2,2,2);  
22.   
23.          color.setAlpha(arr[i]);  
24.          painter.setPen(color);  
25.          painter.drawPath(path);  
26.   
27.      }  
28.   
29.   
30. }  

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1.   

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1. 效果图：  

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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