[Interest] Semi transparent background for contextual menu

[Nicolas Krieger]

Hi,

Thank you for the answer. I made it work with your help, but I lost the 
transparency of  the popup.

If the widget has a parent, there is transparency, but I lost the 
Qt::ActiveWindowFocusReason when I lost focus

Le 16/03/2017 à 22:38, Etienne Sandré-Chardonnal a écrit :
> I forgot, in order to detect when the window lost "focus" (ie is no 
> longer the active window), you need to catch QFocusEvent, and check if 
> reason() is Qt::ActiveWindowFocusReason
>
> Cheers,
>
> Etienne
>
> 2017-03-16 22:34 GMT+01:00 Etienne Sandré-Chardonnal 
> <etienne.sandre at m4x.org <mailto:etienne.sandre at m4x.org>>:
>
>     Hi,
>
>     That's because a context menu is a system level window, not a widget.
>     And what you call focus is in fact not focus, but active window.
>     See QApplication::activeWindow
>
>     You create such a window by creating a QWidget with no parent and
>     a WindowFlag:
>
>     QWidget(0, Qt::Popup);
>
>     2017-03-16 15:56 GMT+01:00 Nicolas Krieger
>     <nicolas.krieger-medecom29 at orange.fr
>     <mailto:nicolas.krieger-medecom29 at orange.fr>>:
>
>         Hi,
>
>         I try to have a contextual menu with a semi-transparent
>         background. I didnt manage to to it with QMenu, so I decided
>         to use a custom widget.
>
>         I have no problem to have a widget with a semi-transparent
>         background, I just changed the alpha of the background color.
>
>         My problem is that I want this widget to behave like a
>         contextual menu, that is to say, I want it to be closed when
>         focus is lost. But this is lot as soon as I clic on a
>         children-widget of this menu. I don't know how to do.
>
>         Nicolas Krieger
>
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