Qt实现部件透明阴影效果与不规则窗体详解

setWindowOpacity(0.5);//0~1之间

setWindowFlags(Qt::FramelessWindowHint);//无边框
setAttribute(Qt::WA_TranslucentBackground);//透明

QGraphicsOpacityEffect *opacityEffect=new QGraphicsOpacityEffect;
opacityEffect->setOpacity(0.5);
ui->pushButton->setGraphicsEffect(opacityEffect);

protected:
    void paintEvent(QPaintEvent *event);

//重写paintEvent方法，是实现窗体半透明
void MainWindow::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.fillRect(rect(),QColor(255,255,255,50));
}

setWindowFlags(Qt::FramelessWindowHint);//无边框
setAttribute(Qt::WA_TranslucentBackground);//透明

QGraphicsDropShadowEffect *shadowEffect= new QGraphicsDropShadowEffect;
shadowEffect->setColor(QColor(100,100,100));//设置阴影颜色
shadowEffect->setBlurRadius(20);//设置阴影模糊半径
shadowEffect->setOffset(20);//设置阴影偏移值
ui->pushButton->setGraphicsEffect(shadowEffect);

QPixmap pixmap;
pixmap.load(":/yellow.png");
ui->label->resize(pixmap.size());
resize(pixmap.size());
//设置遮罩
setMask(pixmap.mask());