<![CDATA[Window opacity]]>Hi
I want to set the window opacity of some widgets so I started with
@
ui.buttonLabel_4->setWindowOpacity(0.0);
@
which had no effect

then I tried
@
QGraphicsOpacityEffect* opacityEffect = new QGraphicsOpacityEffect(this); // make sure to create using new, since effect has to be alive as long as the target widget is using it.
opacityEffect->setOpacity(0.0); // initially widget should be visible
ui.buttonLabel_4->setGraphicsEffect(opacityEffect);
@
which has the desired effect.

My question is why did my first option not work?

Thanks

]]>https://forum.qt.io/topic/34736/window-opacityRSS for NodeSun, 14 Jun 2026 15:55:10 GMTTue, 26 Nov 2013 09:21:11 GMT60<![CDATA[Reply to Window opacity on Tue, 26 Nov 2013 09:25:31 GMT]]>Hi,

Since button is not a window. See "windowOpacity":http://qt-project.org/doc/qt-5.0/qtwidgets/qwidget.html#windowOpacity-prop

]]>https://forum.qt.io/post/205297https://forum.qt.io/post/205297Tue, 26 Nov 2013 09:25:31 GMT