how to set transparent background for QStyleOptionButton ?

[kongkong163]

I want to set the button with transparent background while I paint the button by

QApplication::style()->drawControl(QStyle::CE_PushButton,&buttonOption, painter);

I know use the style sheet

setStyleSheet("QPushButton{background: transparent;}");

can make the background transparent. But how to set stylesheet for the QStyleOptionButton? Or other ways for set transparent background for QStyleOptionButton ?

[Nitesh Bhardwaj]

have a look on that, it might be helpful,
http://doc.qt.nokia.com/latest/widgets-styles.html

[Fuzzbender]

You don't set stylesheets for QStyleOptions, you set stylesheets from QWidgets. StyleOptions are "utility" class for the styles to draw the widget.
In case you already have instance of (or can access) QStyleOption, then you can simply modify the palette variable, In this specific case, just set the QPalette::Background and set it to Qt::transparent.
Be prepared for strange looking button.
In case, you want to control the opacity of the widget, just modify you QPainter instance.

[kongkong163]

Thanks for quick reply . I will try to use the Palette to set the background.