Qt窗口特殊效果_1

• 窗口直接透明
  setWindowOpacity(0.1);
  
• 部件不透明，窗体背景完全透明，Windows下需要配合无边框风格

setWindowFlags(Qt::FramelessWindowHint);
setAttribute(Qt::WA_TranslucentBackground);

• 只设置部件透明

QGraphicsOpacityEffect * opacityEffect = new QGraphicsOpacityEffect;
opacityEffect->setOpacity(0.1);
ui->label->setGraphicsEffect(opacityEffect);

• 阴影效果

    
    
```cpp
QGraphicsDropShadowEffect* shadowEffect = new QGraphicsDropShadowEffect;
    //阴影色，透明度
    shadowEffect->setColor(QColor(100,100,100));
    shadowEffect->setBlurRadius(20);//阴影模糊半径
    shadowEffect->setOffset(20);//阴影偏移值
    ui->label->setGraphicsEffect(shadowEffect);

• 实现半透明

//重写paintEvent
void MainWindow::paintEvent(QPaintEvent* event)
{   //实现半透明
    QPainter painter(this);
    painter.fillRect(rect(),QColor(255,255,255,256));
}

• 设置不规则窗体形状

1. 找一个PNG，加到资源文件

2.  pixmap.load(":/flower.png");
    resize(pixmap.size());
    setMask(pixmap.mask());//设置遮罩```
   

3. 重写paintEvent

void Widget::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.drawPixmap(0,0,QPixmap(":/flower.png"));
}