如何更改ui-> widget-> windowOpacity？

现在我想改变ui-> widget-> windowOpacity和ui-> stackedWidget-> windowOpacity（），但是失败了。如何更改ui-> widget-> windowOpacity？

void Widget::on_pushButton_clicked() 
{ 
    QTimer *timerOpacity = new QTimer(this); 
    connect(timerOpacity,SIGNAL(timeout()),this,SLOT(changeOpacity())); 
    timerOpacity->start(100); 
} 

void Widget::changeOpacity() 
{ 
    if (opalevel > 8) return; 

    double opacity[9] = {0.9,0.8,0.7,0.6,0.5,0.4,0.3,0.2,0.1}; 

    ui->stackedWidget->setWindowOpacity(opacity[opalevel]); 
    ui->widget->setWindowOpacity(opacity[opalevel]); 
    this->setWindowOpacity(opacity[opalevel]); 

    qDebug()<<"opalevel = "<< opalevel <<" ui->widget opacity:"<<ui->widget->windowOpacity(); 
    qDebug()<<"opalevel = "<< opalevel <<" ui->stackedWidget opacity:"<<ui->stackedWidget->windowOpacity(); 
    qDebug()<<"opalevel = "<< opalevel <<" ui opacity : "<< this->windowOpacity()<<endl; 

    opalevel++; 
}

调试日志：

opalevel = 0 ui->widget opacity: 1 
opalevel = 0 ui->stackedWidget opacity: 1 
opalevel = 0 ui opacity: 0.898039 

opalevel = 1 ui->widget opacity: 1 
opalevel = 1 ui->stackedWidget opacity: 1 
opalevel = 1 ui opacity: 0.8 

opalevel = 2 ui->widget opacity: 1 
opalevel = 2 ui->stackedWidget opacity: 1 
opalevel = 2 ui opacity: 0.698039 

opalevel = 3 ui->widget opacity: 1 
opalevel = 3 ui->stackedWidget opacity: 1 
opalevel = 3 ui opacity: 0.596078 

opalevel = 4 ui->widget opacity: 1 
opalevel = 4 ui->stackedWidget opacity: 1 
opalevel = 4 ui opacity: 0.498039 

opalevel = 5 ui->widget opacity: 1 
opalevel = 5 ui->stackedWidget opacity: 1 
opalevel = 5 ui opacity: 0.4 

opalevel = 6 ui->widget opacity: 1 
opalevel = 6 ui->stackedWidget opacity: 1 
opalevel = 6 ui opacity: 0.298039 

opalevel = 7 ui->widget opacity: 1 
opalevel = 7 ui->stackedWidget opacity: 1 
opalevel = 7 ui opacity: 0.2 

opalevel = 8 ui->widget opacity: 1 
opalevel = 8 ui->stackedWidget opacity: 1 
opalevel = 8 ui opacity: 0.0980392

谢谢您的帮助。

来源

2011-09-13 Carina

我很想帮忙，但由于您使用的UI我假设你有一个desiger创建对话框？至少描述你的小部件在这个对话框中的组织方式。 –

感谢您的回复，我使用Qt Creator创建UI文件，并拖动UI组件。使用对话框是好的，但小部件不是。我得到的原因：void QWidget :: setWindowOpacity（qreal opacity） { Q_D（QWidget）;如果（！isWindow（）） return（） // ... – Carina

这不是一个窗口。所以......我怎样才能改变添加到主窗口小部件（窗口）的窗口小部件的不透明度？谢谢... – Carina

你可以用你的非顶级部件QGraphicsOpacityEffect：

// in the constructor 
opacityEffect = new QGraphicsOpacityEffect; 
ui->widget->setGraphicsEffect(opacityEffect); 
... 
// in changeOpacity() 
opacityEffect->setOpacity(opacity[opalevel]);

来源

2011-09-14 03:51:34 alexisdm

哦，是啊！非常感谢！！！ – Carina

如何更改ui-> widget-> windowOpacity？

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