1：问题：

      将 QCefView 嵌入一个父窗体，父窗体具备背景透明的属性，此时 QCefView 就不显示了；

      由于以上原因，所以无法通过父窗口透明，来实现绘制窗口边框和圆角。

2：解决方法：

• 自定义Shadow窗口，实现画边框和圆角。（HHDropShadowWidget）

          窗口属性：

          setWindowFlags(Qt::FramelessWindowHint |Qt::WindowStaysOnTopHint|Qt::Tool);

     setAttribute(Qt::WA_DeleteOnClose, true);
     setAttribute(Qt::WA_TransparentForMouseEvents);
     setAttribute(Qt::WA_TranslucentBackground);

     重绘事件：

       m_iShadowWidth = 8;

          m_iRadios = 8;

     paintEvent(QPaintEvent *event)

    {

                QPainterPath path;

        path.setFillRule(Qt::WindingFill);

        path.addRoundedRect(m_iShadowWidth, m_iShadowWidth, \

                        this->width()-m_iShadowWidth*2, this->height()-m_iShadowWidth*2, \

                        m_iRadios, m_iRadios);

                QPainter painter(this);

        painter.setRenderHint(QPainter::Antialiasing, true);

               //painter.fillPath(path, QBrush(Qt::white));

              QColor color(0, 0, 0, 0);

              for(int i=0; i<<SPAN style="COLOR: #800000">m_iShadowWidth; i++)

      {

                QPainterPath path;

        path.setFillRule(Qt::WindingFill);

        path.addRoundedRect(m_iShadowWidth-i, m_iShadowWidth-i, \

                            this->width()-(m_iShadowWidth-i)*2,、

              this->height()-(m_iShadowWidth-i)*2, \

                            m_iRadios, m_iRadios);

                 int alpha = 38 - i*5;

        color.setAlpha(alpha);

        painter.setPen(color);

        painter.drawPath(path);

      }

     }

• 自定义ContentWindow窗口，用于承载qcefview加载web页面。（HHShellWgt）
• 在ContentWindow窗口中，创建Shadow窗口。
• 重写void resizeEvent(QResizeEvent *event);
• 重写void moveEvent(QMoveEvent *event);
• 重写void showEvent(QShowEvent *event);
• 重写void hideEvent(QHideEvent *event);

      实例代码：

      void HHShellWgt::resizeEvent(QResizeEvent *event)

   {

               if(m_pShadowWgt)

       {

                       QSize s = event->size();

                        m_pShadowWgt->resize(s.width() + m_iShadowWidth*2, 、

                                                    s.height() + m_iShadowWidth*2);

        }

   }

       void HHShellWgt::moveEvent(QMoveEvent *event)

   {

              if(m_pShadowWgt)

      {

                    QPoint p = event->pos();

                    m_pShadowWgt->move(p.x() - m_iShadowWidth, p.y() - m_iShadowWidth);

      }

   }

       void HHShellWgt::showEvent(QShowEvent *event)
   {

                if(m_pShadowWgt)

       {
                    m_pShadowWgt->show();
       }

   }

       void HHShellWgt::hideEvent(QHideEvent *event)
   {
             if(m_pShadowWgt)
      {
                   m_pShadowWgt->hide();
      }
   }