QT widgets and transparency

[shwong2002]

I have two custom QT widgets (basically opengl QT widgets) inside a QMainWindow.

I want the QMainWindow to be transparent, but I still want what is rendered in the Opengl widgets to be opaque.

I cannot seem to do this. When I set the main window as transparent, the widgets become transparent too even if I modify the attributes, background roll, and AutobackgroundFill of the widget. In this case, I basically have everything transparent -- here is my code, which is in the constructor of the QMainWindow. Any ideas of what is wrong? Thanks!

//try to make the window transparent
setAttribute(Qt::WA_TranslucentBackground); //this line makes everything dissapear!!!
setStyleSheet("background:transparent;");
setWindowFlags(Qt::FramelessWindowHint);

ui.glWidgetChai->setAutoFillBackground(true);
ui.glWidgetChai->setAttribute(Qt::WA_OpaquePaintEvent);
ui.glWidgetChai->setBackgroundRole(QPalette::Button);

//ui.layoutTopView->addWidget(glWidgetChai2);
ui.glWidgetChai2->setAutoFillBackground(true);
ui.glWidgetChai2->setAttribute(Qt::WA_OpaquePaintEvent);
ui.glWidgetChai2->setBackgroundRole(QPalette::Button);

[Jeroentjehome]

Hi, The stylesheet/code you posted is almost unreadable. Please place it within Code block. The stylesheet is a very powerfull option for widgets. I also encountered a similar problem. The stylesheet of the parent will also be the stylesheet for the widgets. When you want a stylesheet only active for a single type of widget you could try the following:
@setStylesheet(QMainWindow{border-image:none});@
This will set the border image only for the QMainWindow and if your child widgets will not be (or inherit) a QMainWindow there stylesheets will be left unchanged.
Hope this helps, but to help you even better, place the code in a code block please.
Happy coding!