Making a translucent window, opaque contents

nicky j

Hello,

How could I make my QMainWindow translucent but keep all the contents of it at their normal opacity?

Thanks!

dheerendra

In summary use the stylesheet way of allowing the properties to child or not. One way of doing is that
Use the setObjectName("myObjectName") then use object name selector # in the css.

nicky j

ok so this is what I have:

@mainView::mainView(QWidget *parent)
: QMainWindow(parent)
{
this->setWindowOpacity(0.8);@

It sets the mainView and everything within it to 0.8 opacity. How can I set it to that opacity, but keep all the contents at 1.0 opacity?

dheerendra

Try this.
@ this->setObjectName("myname");
QString style = "QMainWindow#myname { opacity:0.8 }";
this->setStyleSheet(style);@

nicky j

hmm that doesn't seem to do anything

dheerendra

I tried this and it works. It may be issue with your Window Size. Just try with following code.

@
this->setObjectName("myname");
QString style = "QMainWindow#myname { background-color: yellow }";
this->setStyleSheet(style);

 QPushButton *button = new QPushButton("Hello");
 button->setObjectName("mybutton");
 QString style1 = "QPushButton#mybutton { color: red }";
 button->setStyleSheet(style1);@

nicky j

Ok so your second example works, but I still can't change the opacity. I tried "background: transparent" but it made the background black. What else can I try?

raven-worx

i don't know what you want exactly, but making a window background transparent is only possible when you do the following:
@
QVBoxLayout* layout = new QVBoxLayout;
layout->addWidget(new QComboBox);
layout->addWidget( new QSlider );
QWidget* mainWidget = new QWidget;
mainWidget->setLayout(layout);

QMainWindow mainWin;
    mainWin.setObjectName("main");
    mainWin.setCentralWidget( mainWidget );
    mainWin.setWindowFlags(Qt::FramelessWindowHint);     //<<<<<<<<<
    mainWin.setAttribute(Qt::WA_TranslucentBackground);      //<<<<<<<<<
    mainWin.setStyleSheet(
                "QMainWindow#main {"
                "background: transparent;"
                "}"
                );
mainWin.show();

@

Note the setting of the window flags and widget attribute.

nicky j

Yeah I've used that type of code before, and it just makes what should be transparent black. Is it possible that this is a limitation of OS X?