Qt 实现遮罩效果弹框

ExitWidget::ExitWidget(QWidget* parent)
    : QWidget(parent)
{
    setWindowFlags(Qt::FramelessWindowHint | Qt::Tool);
    setAttribute(Qt::WA_TranslucentBackground);
}


void ExitWidget::paintEvent(QPaintEvent* event)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);   //反走样
    painter.setClipping(true);

　　//遮罩
    painter.setPen(Qt::NoPen);
    painter.setBrush(QColor(0, 0, 0, 120));
    painter.drawRect(rect());

　　//窗口外框
    QRect rectButtom((width() - Width) / 2, (height() - Height) / 2, Width, Height);

    painter.setPen(Qt::NoPen);
    painter.setBrush(QColor(255, 255, 255, 120));
    painter.drawRoundedRect(rectButtom, border, border);   //画圆角矩形

    QPixmap pix;
    pix.load(":/act/exit/MaskGroup.png");   //添加图片（从而形成了【不规则窗体】）
    pix = pix.scaled(413, 203);

    painter.drawPixmap((width() - pix.width()) / 2, rectButtom.y() - 120, pix);int spacing = (Width - m_pCancelButton->width() * 2) / 3;
    m_pCancelButton->move(rectButtom.x() + spacing, m_pTipLabel->y() + m_pTipLabel->height() + 20);
    m_pOkButton->move(m_pCancelButton->x() + m_pCancelButton->width() + spacing, m_pCancelButton->y());

}

//设置该窗口的位置（注意：当父窗口大小改变、移动、最小化后恢复都得设置位置）
QPoint globalPos = this->mapToGlobal(QPoint(0, 0));   //父窗口绝对坐标
m_pExitWidget->move(globalPos.x(), globalPos.y());   //窗口移动